CN118294400B - Rapid identification method for non-degradable plastic product - Google Patents
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- 229920006238 degradable plastic Polymers 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 178
- 238000010521 absorption reaction Methods 0.000 claims abstract description 88
- 238000001228 spectrum Methods 0.000 claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims description 27
- 230000003595 spectral effect Effects 0.000 claims description 22
- 238000002329 infrared spectrum Methods 0.000 claims description 13
- 238000012216 screening Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 abstract description 3
- 238000002835 absorbance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920000704 biodegradable plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The invention discloses a rapid identification method for non-degradable plastic products, which relates to the technical field of rapid identification of non-degradable plastic products, the invention determines a plurality of identification bands of the degradable plastic materials by comparing the characteristics of absorption peaks in the same band in standard spectrum characteristic diagrams of different degradable plastic materials, prioritizes the identification bands based on the number of types of the non-degradable plastic materials which can be identified corresponding to each identification band, according to the method, the characteristics of the absorption peaks in the corresponding identification wave bands are compared in sequence, the comparison sequence is set, the characteristics of the absorption peaks in the wave number range with higher identification degree are compared preferentially, the identification rate of the non-degradable plastic material is improved, and when a certain non-degradable plastic material is identified, the comparison of the rest wave number ranges in the standard infrared spectrogram of the material is stopped, so that the comparison process is more efficient, and the acquisition and generation of excessive useless data are reduced.
Description
Technical Field
The invention relates to the technical field of rapid identification of non-degradable plastic products, in particular to a rapid identification method for non-degradable plastic products.
Background
Non-degradable plastic products refer to plastic products made of high molecular materials which are not easily decomposed by microorganisms in nature, and the products cannot be effectively decomposed by themselves in the natural environment. Non-degradable disposable plastic articles are a specific subclass of this general class.
The non-degradable disposable plastic products are especially those produced with non-biodegradable plastic materials and are only used for disposable products after a short use. Such as a disposable plastic cup. Tableware: such as plastic cutlery boxes, plastic spoons, plastic forks, plastic knives, etc., which are difficult to degrade under natural conditions by microbiological action or environmental factors such as water, oxygen, etc., due to the stable and durable nature of their materials after a short period of use. Thus, their presence constitutes a long-term challenge to the ecological environment, one of the important sources of environmental pollution.
Currently, identification of non-degradable plastic products mainly depends on infrared spectrum analysis technology, and the method is used for realizing identification by comparing characteristic differences between an infrared spectrum of plastic to be detected and an infrared spectrum of a series of known non-degradable plastic materials. In the analysis process, firstly, the characteristic parameters of absorption peaks in different wave number (namely different frequencies) ranges are extracted from an infrared spectrogram of the plastic to be detected, and then the parameters are compared with the characteristic parameters of the absorption peaks of all known non-degradable plastic materials in the same wave number range one by one. Through the comparison, whether the plastic to be detected contains specific non-degradable components or not can be judged;
however, in order to compare the whole and the comparison result accurately, the characteristics of the absorption peaks in all the different wave number ranges of one non-degradable plastic material are compared once, and the comparison sequence of the absorption peaks in the different wave number ranges is not required to be fixed, so that the comparison process becomes low in efficiency, and the identification rate of the non-degradable plastic material is affected;
in order to solve the above problems, the present invention proposes a solution.
Disclosure of Invention
The invention aims to provide a rapid identification method for non-degradable plastic products, which aims to solve the problems that in the prior art, in order to compare the complete and accurate comparison results when the non-degradable plastic products are subjected to material identification, the characteristics of absorption peaks in all different wave number ranges of one non-degradable plastic material are compared once, and the comparison sequence of the absorption peaks in the different wave number ranges is not required to be fixed, so that the comparison process becomes low, and the identification speed of the non-degradable plastic materials is influenced;
The aim of the invention can be achieved by the following technical scheme:
a rapid identification method for non-degradable plastic articles, comprising the steps of:
step one: extracting corresponding spectral characteristics from reference infrared spectrograms of all non-degradable plastic materials prestored in a standard infrared spectrogram library, wherein the spectral characteristics comprise peak positions, peak intensities and peak shapes of a plurality of absorption peaks;
Step two: determining a plurality of equal-width wave bands according to the scanning range of the reference infrared spectrogram, comparing the spectral characteristics of any two non-degradable plastic materials, dividing the wave bands into identification wave bands or near-source wave bands based on the comparison result, determining a plurality of identification wave bands based on the corresponding two non-degradable plastic materials, and determining an identification analysis table of all the non-degradable plastic materials according to the identification wave bands;
Step three: screening and determining numbers bound by a plurality of identification bands according to preset screening rules according to the plurality of identification bands contained in the identification analysis tables of all the non-degradable plastic materials;
Step four: and acquiring infrared spectrum data of the target product, sequentially intercepting image data of the corresponding identification wave bands in the infrared spectrum data of the target product from large to small according to the numbers bound by the identification wave bands, comparing the intercepted image data with the image data of the corresponding identification wave bands intercepted from the reference infrared spectrograms of all the non-degradable plastic materials every time, and determining whether the target product contains the corresponding non-degradable plastic materials or not based on the comparison result.
Further, the specific steps of the differential analysis table for determining all the non-degradable plastic materials in the second step are as follows:
S11: the method comprises the steps of sequentially marking non-degradable plastic materials corresponding to all reference infrared spectrograms currently stored in a material identification module as A1, A2, aa and a which are more than or equal to 1;
S12: extracting corresponding spectral characteristics from reference infrared spectrograms of non-degradable plastic materials A1, A2, and Aa in sequence, wherein the spectral characteristics comprise peak positions, peak intensities and peak shapes of a plurality of absorption peaks, the peak positions refer to wave numbers corresponding to the maximum absorption positions of the absorption peaks, and the peak shapes refer to the shapes of the absorption peaks;
S13: dividing the scanning range of the reference infrared spectrogram into a plurality of equal-width wave bands, wherein the wavelength of each wave band is P1 wave number (cm -1);
the divided plurality of equal-width wave bands can be sequentially expressed as P2-P1, P2-P1-P2-P1, P2- (b-1) P1-P3, P2 and P3 are respectively the upper limit wave number and the lower limit wave number of the scanning range of the reference infrared spectrogram, and b is the total number of the divided wave bands;
In the wave bands represented as P2-P1, the wave band upper limit of the wave band is in front of 'to' and the wave band lower limit of the wave band is behind 'to' and the rest wave bands are the same;
the method comprises the steps that a plurality of divided wave bands are marked as B1, B2, bb and B is more than or equal to 1 in sequence from big to small according to the upper limit of each wave band;
S14: selecting a non-degradable plastic material A1 as a main analysis material, selecting a non-degradable plastic material A2 as an analysis material to be adapted, and judging a discrimination band or a near-source band of the band B1 according to a preset judgment rule based on the non-degradable plastic materials A1 and A2;
S15: sequentially judging the identification wave bands or the near-source wave bands of the wave bands B1, B2 according to the sequence of the wave bands B1, B2 and the near-source wave bands based on the nondegradable plastic materials A1 and A2;
After the judgment is completed, acquiring all discrimination bands marked as non-degradable plastic materials A1 and A2 and generating discrimination analysis data based on the non-degradable plastic materials A1 and A2 according to the discrimination bands, wherein the discrimination analysis data comprises upper and lower limit wave numbers of the discrimination bands;
s16: sequentially generating differential analysis data based on the non-degradable plastic materials A1 and A2, A1 and A3, and a.1 and Aa according to the sequence of the non-degradable plastic materials A2, A3, aa and the steps S14 to S15;
The spectral signature analysis module generates a discriminant analysis table of the non-degradable plastic material A1 from discriminant analysis data based on the non-degradable plastic materials A1 and A2, A1 and A3.
S17: according to the sequence of the non-degradable plastic materials A2, A3, and Aa, the non-degradable plastic materials A2, A3, and Aa are sequentially selected as main analysis materials, the rest of the non-degradable plastic materials are analysis materials to be adapted, and according to the steps from S14 to S16, the identification analysis tables of the non-degradable plastic materials A2, A3, and Aa are sequentially generated.
Further, the step S14 of determining the discrimination band or near-source band for the band B1 specifically includes the following steps:
s141: extracting all absorption peaks with absorption peak positions within a wave band B1 from the spectrum characteristics of the main analysis material, and marking all absorption peaks as C1, C2, C, cc and C is more than or equal to 1 in sequence from the higher intensity of the corresponding peaks to the lower intensity of the corresponding peaks;
S142: creating a record variable Z1, wherein the initial value of Z1 is 0;
S143: and extracting all absorption peaks with absorption peak positions within the range of the wave band B1 from the spectral characteristics of the nondegradable plastic material A2, if the absorption peaks are not extracted, calibrating the wave band B1 as the identification wave bands of the nondegradable plastic materials A1 and A2, otherwise, performing secondary judgment on the wave band B1 according to a preset secondary judgment rule based on the absorption peak C1.
The invention has the beneficial effects that:
The invention determines a plurality of identification bands related to the two-by-two degradable plastic materials by comparing peak positions, peak intensities and peak shapes of absorption peaks in the same bands in standard spectrum characteristic diagrams of different degradable plastic materials, in this way, the band ranges of the different characteristics of the two-by-two degradable plastic materials can be directly identified, then the identification bands are prioritized based on the types and the numbers of the non-degradable plastic materials which can be identified corresponding to the identification bands, in the process of identifying the non-degradable plastic materials of target products, the peak position, the peak intensity and the peak shape of the absorption peak in the corresponding identification wave band are sequentially compared according to the priority, and in this way, the comparison sequence is set, the peak position, the peak intensity and the peak shape of the absorption peak in the wave number range with higher identification degree are preferentially compared, the identification rate of the non-degradable plastic material is improved, and when a certain non-degradable plastic material is identified, the comparison of the rest wave number ranges in the standard infrared spectrogram of the material is stopped, so that the comparison process is more efficient, and the acquisition and the generation of excessive useless data are reduced.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a flow chart of the method of the present invention;
Fig. 2 is a system block diagram of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, a rapid identification method for non-degradable plastic articles is performed based on a rapid identification system for non-degradable plastic articles, the system comprising a spectral data acquisition module, a material identification module, and a spectral signature analysis module;
the spectrum data acquisition module is used for acquiring infrared spectrum data of the target product and transmitting the infrared spectrum data to the material identification module, wherein the infrared spectrum data refers to an infrared spectrum; the target product refers to a non-degradable plastic product, and in the embodiment, the target product refers to disposable plastic tableware in the non-degradable plastic product, including but not limited to a plastic box, a knife, a fork, a spoon and a bowl;
in this embodiment, the infrared spectrogram of the target product is obtained by testing the infrared spectrogram of the target product;
The material identification module is used for identifying the non-degradable plastic material of the target product and comprises a standard infrared spectrogram library, wherein a plurality of reference infrared spectrograms of the non-degradable plastic material are prestored in the standard infrared spectrogram library;
The spectral characteristic analysis module is used for analyzing the reference infrared spectrograms of all the undegradable plastic materials prestored in the standard infrared spectrogram library, and the specific analysis steps are as follows:
S11: the method comprises the steps of sequentially marking non-degradable plastic materials corresponding to all reference infrared spectrograms currently stored in a material identification module as A1, A2, aa and a which are more than or equal to 1;
S12: extracting corresponding spectral characteristics from reference infrared spectrograms of non-degradable plastic materials A1, A2, and Aa in sequence, wherein the spectral characteristics comprise peak positions, peak intensities and peak shapes of a plurality of absorption peaks, the peak positions refer to wave numbers corresponding to the maximum absorption positions of the absorption peaks, and the peak shapes refer to the shapes of the absorption peaks;
S13: performing band division, namely dividing a scanning range of a reference infrared spectrogram into a plurality of equal-width bands, wherein the wavelength of each band is P1 wave number (cm -1), and in the embodiment, the value of P1 is 500;
The plurality of equally wide wave bands divided at this time can be sequentially expressed as P2-P1, P2-P1-P2-P1, P2- (b-1) P1-P3, P2 and P3 are respectively the upper limit wave number and the lower limit wave number of the scanning range of the reference infrared spectrogram, and b is the total number of the divided wave bands;
Wherein in the wave bands represented as P2-P1, the wave band upper limit of the wave band is in front of 'to' and the wave band lower limit of the wave band is behind 'to' and the rest wave bands are the same;
the method comprises the steps that a plurality of divided wave bands are marked as B1, B2, bb and B is more than or equal to 1 in sequence from big to small according to the upper limit of each wave band;
s14: selecting a non-degradable plastic material A1 as a main analysis material, selecting a non-degradable plastic material A2 as an analysis material to be adapted, and judging a band B1 to identify a band or a near-source band according to a preset judging rule based on the non-degradable plastic materials A1 and A2, wherein the preset judging rule is as follows:
s141: extracting all absorption peaks with absorption peak positions within a wave band B1 from the spectrum characteristics of the main analysis material, and marking all absorption peaks as C1, C2, C, cc and C is more than or equal to 1 in sequence from the higher intensity of the corresponding peaks to the lower intensity of the corresponding peaks;
S142: creating a record variable Z1, wherein the initial value of Z1 is 0;
s143: extracting all absorption peaks with absorption peak positions within a range of a wave band B1 from spectral features of a non-degradable plastic material A2, if the absorption peaks are not extracted, calibrating the wave band B1 as a discrimination wave band of the non-degradable plastic materials A1 and A2, otherwise, performing secondary judgment on the wave band B1 based on the absorption peak C1 according to a preset secondary judgment rule, wherein the secondary judgment rule comprises the steps of S21-S22:
The absorption peak located between the start wave number D1 and the end wave number D2 means that the start wave number or the end wave number of the absorption peak is between D1 and D2, or that the start wave number of the absorption peak is equal to or greater than D1 and the end wave number of the absorption peak is equal to or less than D2;
S21: acquiring a start wave number D1 and an end wave number D2 of an absorption peak C1 in a reference infrared spectrogram of the main analysis material;
S22: extracting an absorption peak between a start wave number D1 and an end wave number D2 from a reference infrared spectrogram of an analysis material to be adapted, if the absorption peak is not extracted, adding 1 to the value of a record variable Z1, and if the absorption peak is extracted, re-judging a wave band B1 according to a preset re-judging rule based on the absorption peak C1, wherein the re-judging rule comprises the steps of S31-S32:
S31: all the extracted absorption peaks are marked as E1, E2, ee and E is more than or equal to 1 according to the sequence from the peak intensity to the peak intensity;
s32: sequentially carrying out difference making on peak intensities of absorption peaks E1, E2 and Ee and peak intensity of absorption peak C1 to obtain corresponding difference values, and if the absolute value of the peak intensity difference value of one absorption peak and the peak intensity difference value of the absorption peak C1 is within P4, carrying out difference range comparison threshold value by P4 which is a preset difference, calculating and obtaining the similarity of the peak shapes of the absorption peak and the absorption peak C1 by using a similarity algorithm;
if the similarity is smaller than P5, calibrating the wave band B1 as an identification wave band of the nondegradable plastic materials A1 and A2, wherein P5 is a preset identification similarity comparison threshold value, and if the similarity is larger than or equal to P5, carrying out identification wave band sub-judgment and re-judgment on the wave band B1 based on the absorption peak C2 according to the sequence of C1, C2, cc until carrying out identification wave band sub-judgment and re-judgment on the wave band B1 based on the absorption peak Cc;
If the band B1 is discriminated and re-discriminated based on the absorption peak Cc, and then the band B1 is not discriminated as the discrimination bands of the non-degradable plastic materials A1 and A2, the value of the recording variable Z1 is obtained, if the value of the recording variable Z1 is larger than PC1, the band B1 is calibrated as the discrimination bands of the non-degradable plastic materials A1 and A2, otherwise, the band B1 is calibrated as the near-source band of the non-degradable plastic materials A1 and A2; the PC1 is a preset difference identification value, and in this embodiment, the value of PC1 is selected correspondingly based on several values given by the tester;
If the absolute value of the peak intensity difference value of one absorption peak and the absorption peak C1 is not in the P4, the wave band B1 is marked as a near source wave band of the nondegradable plastic materials A1 and A2;
S15: sequentially judging the identification wave bands or the near-source wave bands of the wave bands B1, B2 according to the sequence of the wave bands B1, B2 and the near-source wave bands based on the nondegradable plastic materials A1 and A2;
After the judgment is completed, acquiring all discrimination bands marked as non-degradable plastic materials A1 and A2 and generating discrimination analysis data based on the non-degradable plastic materials A1 and A2 according to the discrimination bands, wherein the discrimination analysis data comprises upper and lower limit wave numbers of the discrimination bands;
s16: sequentially generating differential analysis data based on the non-degradable plastic materials A1 and A2, A1 and A3, and a.1 and Aa according to the sequence of the non-degradable plastic materials A2, A3, aa and the steps S14 to S15;
The spectral signature analysis module generates a discriminant analysis table of the non-degradable plastic material A1 from discriminant analysis data based on the non-degradable plastic materials A1 and A2, A1 and A3.
The identification analysis table comprises a material name field and an identification wave band field, wherein the material name field stores the material names of the nondegradable plastic materials A2, A3, the I.A., and Aa, and the identification wave band stores identification analysis data based on the nondegradable plastic material A1 and the corresponding nondegradable plastic material;
S17: sequentially selecting non-degradable plastic materials A2, A3, aa as main analysis materials according to the sequence of the non-degradable plastic materials A2, A3, aa, and the rest of the non-degradable plastic materials as analysis materials to be adapted, and sequentially generating an identification analysis table of the non-degradable plastic materials A2, A3, aa according to the steps from S14 to S16;
The spectral feature analysis module transmits the identification analysis tables of the non-degradable plastic materials A1, A2, A3, the quality control system and the quality control system to the material identification module for storage;
The material identification module receives the transmitted non-degradable plastic materials A1, A2, A3, the authentication analysis table of the Aa, and then analyzes and judges the authentication wave bands according to a preset screening rule, and the specific steps are as follows:
S41: all discrimination bands contained in the discrimination analysis tables of the non-degradable plastic materials A1, A2, A3, and Aa are marked as F1, F2, and Ff, respectively, and F is more than or equal to 1 and less than or equal to b;
S42: traversing all discrimination bands in the discrimination analysis table of the non-degradable plastic material A1, obtaining a plurality of non-degradable plastic materials corresponding to the discrimination band F1, and obtaining a plurality of discrimination combinations based on the discrimination band F1 from the discrimination analysis table of the non-degradable plastic material A1 according to the plurality of non-degradable plastic materials, wherein one discrimination combination comprises the non-degradable plastic material A1 and one non-degradable plastic material corresponding to the discrimination band F1 obtained from the discrimination analysis table of the non-degradable plastic material A1;
S43: sequentially traversing all discrimination bands in the discrimination analysis tables of the non-degradable plastic materials A1, A2, A3, and Aa to respectively obtain a plurality of discrimination combinations based on the discrimination band F1 from the discrimination analysis tables of the non-degradable plastic materials A1, A2, and Aa, and after the traversing is completed, sequentially marking all the obtained discrimination combinations based on the discrimination band F1 as G1, G2, G, and G is more than or equal to 1;
s44: the total number of all non-repeating non-degradable plastic materials included therein is taken from the identification combinations G1, G2, gg, calibrated as an alignment breadth assessment H1 of the identification band F1;
S45: sequentially calculating and acquiring comparison breadth assessment values H1, H2, hf of discrimination bands F1, F2, and F according to S44;
s46: binding the corresponding identification bands with the numbers f, f-1, the numbers of the identification bands and the numbers bound by the identification bands according to the sequence of comparing the breadth evaluation values from large to small, and storing the identification bands and the numbers bound by the identification bands after the binding is finished, wherein the higher the numbers are, the higher the priority of the identification bands is represented;
After receiving the transmitted infrared spectrum data of the target product, the material identification module compares the infrared spectrum data with a plurality of reference infrared spectrograms of non-degradable plastic materials prestored in a standard infrared spectrogram library according to a preset comparison rule, and the comparison rule is specifically as follows:
s51: acquiring all the identification bands stored in the device, and marking all the identification bands as I1, I2, ii and I is more than or equal to 1 according to the sequence of binding numbers of the identification bands from large to small;
S52: according to the initial wave number and the end wave number of the identification wave band I1, capturing an image in a corresponding wave number range from an infrared spectrogram of the target product, and calibrating the captured image as a captured image of the target product based on the identification wave band I1;
S53: according to the initial wave number and the end wave number of the identification wave band I1, images corresponding to the wave beam range are respectively intercepted from a plurality of reference infrared spectrograms of the non-degradable plastic materials prestored in a standard infrared spectrogram library, and the images are respectively marked as intercepted images of the corresponding non-degradable plastic materials based on the identification wave band I1;
s54: matching the intercepted image of the target product based on the identification band I1 with the peak values of a plurality of absorption peaks contained in the intercepted image of the plurality of non-degradable plastic materials based on the identification band I1, if the absorption peak of the intercepted image of the target product based on the identification band I1 is matched with the absorption peak of a certain non-degradable plastic material based on the intercepted image of the identification band I1, determining that the non-degradable plastic material is contained in the target product, otherwise, temporarily preventing any treatment;
S54: after the matching of the intercepted image of the target product based on the identification band I1 and the peak values of the absorption peaks contained in the intercepted image of the non-degradable plastic materials based on the identification band I1 is completed, intercepting the intercepted image of the target product based on the identification band I2 again according to the sequence of I1, I2, I.and I.until the matching of the intercepted image of the target product based on the identification band I and the peak values of the absorption peaks contained in the intercepted image of the non-degradable plastic materials based on the identification band I is completed;
the rules of the reference infrared spectrogram of the non-degradable plastic material and the infrared spectrogram of the target product are identical, namely, the wavenumber range of the non-degradable plastic material and the scale, the spectral resolution and the scanning range of the absorbance of the non-degradable plastic material are consistent;
In the embodiment, the abscissa of the infrared spectrogram is the wave number, the unit is cm -1, and the ordinate is the absorbance;
In one embodiment of the invention, the scanning range of the infrared spectrogram is 4000-400 cm -1; wherein 4000 is the upper limit of the scanning range, representing the highest wave number, 400 is the lower limit of the scanning range, representing the lowest wave number;
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (2)
1. A rapid identification method for non-degradable plastic articles, comprising the steps of:
step one: extracting corresponding spectral characteristics from reference infrared spectrograms of all non-degradable plastic materials prestored in a standard infrared spectrogram library, wherein the spectral characteristics comprise peak positions, peak intensities and peak shapes of a plurality of absorption peaks;
Step two: determining a plurality of equal-width wave bands according to the scanning range of the reference infrared spectrogram, comparing the spectral characteristics of any two non-degradable plastic materials, dividing the wave bands into identification wave bands or near-source wave bands based on the comparison result, determining a plurality of identification wave bands based on any two non-degradable plastic materials, and determining an identification analysis table of all the non-degradable plastic materials according to the identification wave bands;
Step three: screening and determining numbers bound by a plurality of identification bands according to preset screening rules according to the plurality of identification bands contained in the identification analysis tables of all the non-degradable plastic materials;
Step four: collecting infrared spectrum data of a target product, sequentially intercepting image data of corresponding identification bands in the infrared spectrum data of the target product from large to small according to numbers bound by a plurality of identification bands, comparing the intercepted image data with the image data of the corresponding identification bands intercepted from the reference infrared spectrograms of all the non-degradable plastic materials every time, and determining whether the target product contains the corresponding non-degradable plastic materials or not based on comparison results;
The specific steps for determining the identification analysis table of all the non-degradable plastic materials in the second step are as follows:
S11: the method comprises the steps of sequentially marking non-degradable plastic materials corresponding to all reference infrared spectrograms currently stored in a material identification module as A1, A2, aa and a which are more than or equal to 1;
S12: extracting corresponding spectral features from the reference infrared spectrograms of the non-degradable plastic materials A1, A2, the first and second parts;
S13: dividing the scanning range of the reference infrared spectrogram into a plurality of equal-width wave bands, wherein the wavelength of each wave band is P1 wave number;
the divided plurality of equal-width wave bands can be sequentially expressed as P2-P1, P2-P1-P2-P1, P2- (b-1) P1-P3, P2 and P3 are respectively the upper limit wave number and the lower limit wave number of the scanning range of the reference infrared spectrogram, and b is the total number of the divided wave bands;
In the wave bands represented as P2-P1, the wave band upper limit of the wave band is in front of 'to' and the wave band lower limit of the wave band is behind 'to' and the rest wave bands are the same;
the method comprises the steps that a plurality of divided wave bands are marked as B1, B2, bb and B is more than or equal to 1 in sequence from big to small according to the upper limit of each wave band;
S14: selecting a non-degradable plastic material A1 as a main analysis material, selecting a non-degradable plastic material A2 as an analysis material to be adapted, and judging a discrimination band or a near-source band of the band B1 according to a preset judgment rule based on the non-degradable plastic materials A1 and A2;
S15: sequentially judging the identification wave bands or the near-source wave bands of the wave bands B1, B2 according to the sequence of the wave bands B1, B2 and the near-source wave bands based on the nondegradable plastic materials A1 and A2;
After the judgment is completed, acquiring all discrimination bands marked as non-degradable plastic materials A1 and A2 and generating discrimination analysis data based on the non-degradable plastic materials A1 and A2 according to the discrimination bands, wherein the discrimination analysis data comprises upper and lower limit wave numbers of the discrimination bands;
s16: sequentially generating differential analysis data based on the non-degradable plastic materials A1 and A2, A1 and A3, and a.1 and Aa according to the sequence of the non-degradable plastic materials A2, A3, aa and the steps S14 to S15;
The spectral signature analysis module generates a discriminant analysis table of the non-degradable plastic material A1 from discriminant analysis data based on the non-degradable plastic materials A1 and A2, A1 and A3.
S17: sequentially selecting non-degradable plastic materials A2, A3, aa as main analysis materials according to the sequence of the non-degradable plastic materials A2, A3, aa, and the rest of the non-degradable plastic materials as analysis materials to be adapted, and sequentially generating an identification analysis table of the non-degradable plastic materials A2, A3, aa according to the steps from S14 to S16;
The specific steps of the step S14 of identifying the band B1 or judging the near-source band are as follows:
s141: extracting all absorption peaks with absorption peak positions within a wave band B1 from the spectrum characteristics of the main analysis material, and marking all absorption peaks as C1, C2, C, cc and C is more than or equal to 1 in sequence from the higher intensity of the corresponding peaks to the lower intensity of the corresponding peaks;
S142: creating a record variable Z1, wherein the initial value of Z1 is 0;
S143: extracting all absorption peaks with absorption peak positions within the range of a wave band B1 from the spectral characteristics of the nondegradable plastic material A2, if the absorption peaks are not extracted, calibrating the wave band B1 as a discrimination wave band of the nondegradable plastic materials A1 and A2, otherwise, performing secondary judgment on the wave band B1 according to a preset secondary judgment rule based on the absorption peak C1;
The specific steps of S143 for performing the secondary judgment on the band B1 based on the absorption peak C1 are as follows:
S21: acquiring a start wave number D1 and an end wave number D2 of an absorption peak C1 in a reference infrared spectrogram of the main analysis material;
S22: extracting an absorption peak between a start wave number D1 and an end wave number D2 from a reference infrared spectrogram of the to-be-adapted analysis material, if the absorption peak is not extracted, adding 1 to the value of a record variable Z1, and if the absorption peak is extracted, re-judging a wave band B1 according to a preset re-judging rule based on an absorption peak C1;
The specific steps of the step S22 of re-judging the band B1 based on the absorption peak C1 are as follows:
S31: all the extracted absorption peaks are marked as E1, E2, ee and E is more than or equal to 1 according to the sequence from the peak intensity to the peak intensity;
S32: sequentially carrying out difference on peak intensities of absorption peaks E1, E2 and Ee and peak intensities of absorption peak C1 to obtain corresponding difference values, if the absolute value of the peak intensity difference value of one absorption peak and the peak intensity difference value of the absorption peak C1 is within P4, carrying out difference range comparison threshold value by using P4 as a preset difference, calculating and obtaining the similarity of the peak shapes of the absorption peak and the absorption peak C1 by using a similarity algorithm, if the similarity is smaller than P5, calibrating a wave band B1 as an identification wave band of non-degradable plastic materials A1 and A2, and if the similarity is larger than or equal to P5, carrying out identification wave band sub-judgment and re-judgment on the wave band B1 based on the absorption peak C2 according to the sequence of C1, C2 and Cc until the identification wave band sub-judgment and re-judgment are carried out on the wave band B1 based on the absorption peak Cc;
If the band B1 is discriminated and re-discriminated based on the absorption peak Cc, and then the band B1 is not discriminated as the discrimination bands of the non-degradable plastic materials A1 and A2, the value of the recording variable Z1 is obtained, if the value of the recording variable Z1 is larger than PC1, the band B1 is calibrated as the discrimination bands of the non-degradable plastic materials A1 and A2, otherwise, the band B1 is calibrated as the near-source band of the non-degradable plastic materials A1 and A2; the PC1 is a preset difference identification value;
If the absolute value of the peak intensity difference value of one absorption peak and the absorption peak C1 is not in the P4, the wave band B1 is marked as a near source wave band of the nondegradable plastic materials A1 and A2;
in the third step, the preset screening rule for determining a plurality of identification band binding numbers is as follows:
S41: all discrimination bands contained in the discrimination analysis tables of the non-degradable plastic materials A1, A2, A3, and Aa are marked as F1, F2, and Ff, respectively, and F is more than or equal to 1 and less than or equal to b;
S42: traversing all discrimination bands in the discrimination analysis table of the non-degradable plastic material A1, obtaining a plurality of non-degradable plastic materials corresponding to the discrimination band F1, and obtaining a plurality of discrimination combinations based on the discrimination band F1 from the discrimination analysis table of the non-degradable plastic material A1 according to the plurality of non-degradable plastic materials, wherein one discrimination combination comprises the non-degradable plastic material A1 and one non-degradable plastic material corresponding to the discrimination band F1 obtained from the discrimination analysis table of the non-degradable plastic material A1;
S43: sequentially traversing all discrimination bands in the discrimination analysis tables of the non-degradable plastic materials A1, A2, A3, and Aa to respectively obtain a plurality of discrimination combinations based on the discrimination band F1 from the discrimination analysis tables of the non-degradable plastic materials A1, A2, and Aa, and after the traversing is completed, sequentially marking all the obtained discrimination combinations based on the discrimination band F1 as G1, G2, G, and G is more than or equal to 1;
s44: the total number of all non-repeating non-degradable plastic materials included therein is taken from the identification combinations G1, G2, gg, calibrated as an alignment breadth assessment H1 of the identification band F1;
S45: sequentially calculating and acquiring comparison breadth assessment values H1, H2, hf of discrimination bands F1, F2, and F according to S44;
S46: and binding the corresponding identification bands with the numbers f, f-1, the numbers of the identification bands and the numbers bound by the identification bands according to the sequence of comparing the breadth evaluation values from large to small, and storing the identification bands and the numbers bound by the identification bands after the binding is finished.
2. A rapid identification method for non-degradable plastic articles according to claim 1, characterized in that the higher the number, the higher the priority of the identification band bound to the number.
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