CN106053361A - Spectrum reading and processing method and device of multiple sample cell spectral quantitative analysis - Google Patents
Spectrum reading and processing method and device of multiple sample cell spectral quantitative analysis Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/127—Calibration; base line adjustment; drift compensation
- G01N2201/12707—Pre-test of apparatus, e.g. dark test, sensor test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
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- G01N2201/12746—Calibration values determination
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Abstract
The invention discloses a spectrum reading and processing method and device of multiple sample cell spectral quantitative analysis. According to the method, sample cells are divided into reference cells and measuring cells; at first, two kinds of sample cells are both filled with a reference substance; then the sample cells are subjected to spectral scanning to obtain spectrums, which take light intensity as the output and are labeled as Back 0, Back 1, Back 2,..., Back N. During the object analysis process, the reference substance in the measuring tanks is replaced by an object to be analyzed; then the spectrums of the measuring tanks and reference cells are scanned in a mode of background spectrum scanning for another time so as to obtain spectrums, which take light intensity as the output and are labeled as meas 0, meas 1, meas 2,..., meas N. Then according to a formula: Absorbi=-log(measi/Backi)+log(meas0/Back0), the data is processed to obtain a absorption spectrum taking absorbance as the output. The provided method has the advantages that the reference difference between the reference cells and measuring cells can be overcome, especially the influence caused by inconformity of window plate absorption spectrums; the deviation caused by drift and deformation of base line is avoided, and the accuracy of analysis results is largely improved.
Description
[technical field]
The present invention relates to spectrum analysis field, particularly to article components and the spectrum analysis of concentration.
[background technology]
Spectrographic method can realize the quantitative analysis of nearly all polar articles.Along with computer technology, data analysis and place
The development of reason technology, in recent years, infrared spectrometry, ultraviolet spectroscopy have started to be applied to gas, liquid, even solid constituent and
The on-line analysis field of concentration, but current application there is also many problems.It is explained as a example by gas analysis below.
1), when spectral resolution is higher, possible derivative spectomstry distorts.Due to higher in spectral resolution, scanning times is more
Time, the spectral scan time is longer.Such as, spectral resolution is 1cm-1, when scanning times is 8, obtains a spectrogram and taken
Between be about 60 seconds.If resolution brings up to 0.5cm-1, when scanning times increases to 32, it is thus achieved that a spectrogram then needs about 500
The time of second.During gas on-line analysis, component and concentration thereof in gas to be analyzed are that the moment is all in change.Due to light
The acquisition methods of spectrum is first to obtain the background spectrum so that light intensity is output, and then obtaining with light intensity is that the gas to be analyzed exported is inhaled
Receive spectrum, then the spectrum being output with light transmittance obtained with absorption spectrum, the common logarithm of this spectrum divided by background spectrum
Value negative value, then be with absorbance be export spectrogram.In experimental analysis is applied, in the acquisition process of general acquiescence spectrum
Analyzed gas componant and concentration thereof are constant.Obviously, if carry out the spectrum on line of gas only with a measurement air chamber
Analyze, and gas is constantly in flow regime, then this premise is invalid.Then, during spectral scan, due to
The change of gas concentration, the spectrogram in the case of the spectrogram every time obtained not same gas component and same concentrations equal
Value, causes the spectrum obtained unstable, even distorts, so that bigger deviation occurs in Spectroscopic analysis results, especially
Be exist in gaseous mixture to be analyzed absorption spectrum seriously overlapping in the case of, the most seriously.
2) after spectrogrph long-play, if environment changes, need to rescan background spectrum, then may cause number
According to loss.Owing to conventional spectrogrph only one of which measures air chamber, after working long hours, if finding there is bigger change in ambient parameter
Change, need to rescan background spectrum, then need to close air chamber gas circuit, and be passed through background gas, then scanning background spectrum.By
Cleaning in air chamber needs the long period, and typically in several minutes, tested gas is passed through air chamber so that tested component gas concentration reaches
To stable, it is also desirable to several minutes, the most longer time, therefore, this method is easily caused loss of data, and real-time is poor；
3) additionally, in application scenarios such as mine gas monitorings, need to take gas with multiple air chambers from multiple tunnels, before and after taking gas
Time may be longer, about a few hours, it is difficult to ensure take gas before and after, the ambient parameter of instrument is completely the same, including environment
The concentration of middle carbon dioxide.Owing to tested gas concentration itself is the least, therefore, the change of ambient parameter may cause analyzing
Result error is bigger.
In order to overcome the problems referred to above, it may be considered that increase by one, even more than air chamber, it is full of background with one of them air chamber
Gas, scans air chamber as background spectrum, and background air chamber, as measuring air chamber, i.e. scanning backlight time spectrum, is cut into by other
In light path, the background spectrum Back0 that it is output with light intensity that spectrogrph obtains, and when analyzing gas to be measured, then will measure air chamber
In incision light path, now, spectrogrph can scan and obtain with light intensity being that measure spectrum Measij exported (represents ith measurement gas
Room jth time measures the spectrum obtained), then perform formula (1) to obtain the spectrum being output with absorbance.
Absorbij=-log (Measij/Back0) formula (1)
In formula, log () is common logarithm, Absorbij represent ith measurement air chamber jth time measure obtain with extinction
Degree is the spectrum of output.Patent of invention ZL201110091432.4, ZL201410097985.4 and ZL201410119733.7 are
Based on this thought.The problems referred to above can be solved on this theoretical method, but the physical parameter that precondition is air chamber must
Must be just the same, the size of i.e. different air chambers must be accomplished the most just the same, and frame material also must be processed into duplicate.But
Window plated film, such as mid-infrared spectral KBr plated film, accomplish just the same, and that is extremely difficult.Absorbing light due to window
As spectrum is incomplete, this, by bringing baseline drift as shown in Figure 1 to the absorption spectrum of gas, even distorts, thus causes gas
Body analytical concentration deviation is bigger.
[summary of the invention]
It is an object of the invention to, it is provided that the spectrum of a kind of Multi-example pond quantitative spectrochemical analysis reads and processing method and dress
Putting, to overcome the parameter differences between reference cell and measuring cell, particularly window absorption spectrum is inconsistent is carried absorption spectrum
The impact come.
To achieve these goals, the present invention carries out absorption spectrum reading in the following way and processes:
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis reads and processing method, comprises the following steps:
(1) sample cell being divided into reference cell and measuring cell, reference cell is denoted as 0, measuring cell is denoted as 1 successively,
2、···N；
(2) reference cell and all of measuring cell are full of reference substance, and according to the mode scanning optical spectrum of background spectrum, obtain
It is respectively designated as the spectrum being output with light intensity of Back0, Back1, Back2, Back N；Wherein Back0 represents right
Reference cell scans the spectrum obtained, and Back1 represents the spectrum obtaining No. 1 measuring cell scanning, other the like；
(3) reference substance in sample cell is replaced by analysans, then reference cell and measuring cell is cut in light path successively,
Carry out spectral scan, obtain being respectively designated as the light being output with light intensity of meas0, meas1, meas2, meas N
Spectrum；Wherein meas0 represents the spectrum obtaining reference cell scanning, and meas1 represents the spectrum obtaining No. 1 measuring cell scanning, its
It the like；
(4) spectral manipulation is carried out according to following formula (2), the absorption spectrum being output with absorbance；
Absorbi=-log (measi/Backi)+log (meas0/Back0), wherein i=1,2, N formula
(2),
In formula, Absorbi is the absorption spectrum being output with absorbance of measuring cell i.
Further, the described background spectrum in step (2) is with wave number as transverse axis, the spectrum with light intensity as the longitudinal axis.
Further, in the light path of described step (3), each only one of which sample cell.
Further, in described step (3), when carrying out article analysis, it is necessary to rescan measuring cell, obtain every time
meas1、meas2、···meas N；But the update mode of meas0 can be set according to practical situation.
Further, the update mode of described meas0 can be chosen any one kind of them from following several ways:
Mode one: all obtain when every time analyzing；
Mode two: obtain in regular intervals；
Mode three: according to spectrum from confirmation situation decide whether obtain；
Mode four: mode two and mode San Tong method are used, i.e. meets one of two conditions, just update meas0；
And rescaning reference cell, before obtaining new meas0, meas0 keeps constant.
Further, described spectrum from confirmation situation be: according to spectrum whether occur drift and distortion determine be
, if baseline drift is serious, or there is baseline distortion, then reacquire meas0 in no meas0 to be updated；Otherwise, meas0 keeps not
Become.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis reads and the device processed, including a background gas air chamber,
Multiple measurement gas air chambers, support background gas air chamber and the base of measurement gas air chamber, and drive measurement gas air chamber to move
That moves and rotate vertically moves drive mechanism and rotational motion mechanism, described base is further fitted with inductively measure gas gas
The upper limit sensor of position, room and lower limit sensor；Admission line is by pipeline adapting device and multiple measurement gas air chambers
Gas inlet connect, the gas outlet of each measurement gas air chamber is connected with outlet pipe by pipeline adapting device,
Described pipeline adapting device includes M+1 interface, and wherein, an interface is connected with admission line or outlet pipe, remaining
M interface respectively with measure the gas inlet of gas air chamber or gas outlet is connected.
Further, described rotational motion mechanism include motor and be motor driven and intermeshing little gear and
Gear wheel, wherein, multiple measurement gas air chambers pass from described gear wheel.
Further, the described drive mechanism that vertically moves includes motor, screw rod and travelling nut, and described motor is by electricity
Machine mounting seat is fixed on base, and described screw rod is fixing with the output shaft of motor to be connected, and described travelling nut coordinates peace with screw rod
Dress.
Further, the spectrum of described Multi-example pond quantitative spectrochemical analysis reads and has farther included even with the device processed
Connecing installing plate, described travelling nut is arranged on connection installing plate；Described measurement gas air chamber and the fixing peace of background gas air chamber
Being contained in air chamber mounting seat, air chamber mounting seat fixes connection by screw with being connected installing plate.
Relative to prior art, the present invention at least has the advantages that
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis that the present invention provides reads and the method processed, and solves various
The printing opacity of the parameter in product pond, particularly window or optical absorption characteristics cannot be completely secured unanimously, use routine reference spectrum comparison
Easily cause spectrum baseline to drift about, even distort, thus cause analysis result problem bigger than normal；Present invention, avoiding the drift of baseline
Moving the deviation brought with distortion, (measure spectrum obtains divided by background spectrum with transmission to substantially increase precision of analysis
Rate is the spectrum of output, the negative value of the common logarithm value of this spectrum, is the spectrum being output with absorbance, Multi-example pond spectrum
In analysis, obtain, with measuring air chamber, the spectrum that spectrum scans divided by background air chamber, obtain the spectrum being output with absorbance, due to
The difference of two air chamber window parameters so that both difference has been treated as absorption spectrum, so that baseline drifts about, very
To distortion.The method that the present invention proposes, is by two air chambers each scanning background spectrum and measure spectrum, then seeks absorbing light
The difference of spectrum rather than be directly divided by obtain spectrum with two air chambers of routine, therefore the difference of window is just no longer contained in
In baseline)；Meanwhile, when the present invention can solve to rescan background spectrum, data are easily lost, the problem that real-time is poor.
Further, if thinking time-consuming, can set, according to practical situation, the mode updating meas0, easy to operate.
[accompanying drawing explanation]
Fig. 1 is with the background air chamber background that obtains of scanning as reference spectra, to measure spectrum that air chamber scanning obtains for inhaling
Receive spectrum, according to formula (1) calculated spectrum；
Fig. 2 is three air chamber switching schematic diagrams；Wherein (a) is the connection diagram of three air chambers being vertically arranged, and figure (b) is three
The connection diagram of three air chambers of triangular arrangement；In figure, 1 is two measurement air chambers, and 2 is electromagnetic valve, and 3 is threeway, and 4 is air inlet pipe
Road, 5 is outlet pipe, and 6 is background gas air chamber；
Fig. 3 (a) is vertical and horizontal move mode air chamber switching apparatus section of structure；In figure, 1 is the first measurement air chamber,
6 is background gas air chamber, and 7 is motor, and 11 is the second measurement air chamber, and 12 is base, and 13 is guide rod, and 14 is screw rod, and 15 for moving
Dynamic nut, 16 is bearing block, and 17 is lower limit sensor, and 18 is upper limit sensor, and 19 for connecting installing plate, and 20 for measuring gas
Room air inlet, 21 is air chamber mounting seat, and 22 for measuring air chamber gas outlet, and 23 is holding screw；
Fig. 3 (b) is revolution mode air chamber switching apparatus structural representation, and in figure, 1 is the first measurement air chamber, and 2 is electromagnetic valve,
3 is threeway, and 4 is admission line, and 5 is outlet pipe, and 6 is background gas air chamber, and 7 is motor, and 8 is little gear, and 9 are and three gas
The axle being connected with outside air chamber support that room tightens together, 10 is gear wheel, and 11 is the second measurement air chamber；
Fig. 4 is background air chamber and measures the spectrogram being output with light intensity that air chamber twice sweep obtains；
Fig. 5 is the spectrum being output with absorbance obtained according to formula (2) and formula (1) respectively.
[detailed description of the invention]
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis reads and processing method, comprises the following steps:
(1) sample cell being divided into reference cell and measuring cell, carry out label, reference cell is denoted as 0, and other measuring cell is marked successively
Be shown as 1,2, N；
(2) all of sample cell is full of reference substance, and according to the mode scanning optical spectrum of background spectrum, described bias light
Spectrum is with wave number as transverse axis, the spectrum with light intensity as the longitudinal axis；Obtain being respectively designated as Back0, Back1, Back2,
The spectrum being output with light intensity of BackN；Wherein Back0 represents the spectrum obtaining reference cell scanning, and Back1 represents No. 1
Measuring cell scans the spectrum obtained, other the like；
(3) during gas, liquid or solid article are analyzed, by reference cell, and full analysans
All measuring cells cut successively in light path, can adopt and manually switch, it would however also be possible to employ automaton automatically switch,
Ensure each only one of which sample cell in light path；Again all of sample cell is carried out spectral scan, and indicated respectively
The spectrum being output with light intensity for meas0, meas1, meas2, measN；Wherein meas0 represents reference cell scanning
The spectrum obtained, meas1 represents the spectrum obtaining No. 1 measuring cell scanning, other the like；
(4) spectral manipulation is carried out according to following formula (2), the absorption spectrum being output with absorbance；
Absorbi=-log (measi/Backi)+log (meas0/Back0), wherein i=1,2, N formula
(2),
In formula, Absorbi is the absorption spectrum being output with absorbance of measuring cell i.
Further, in described step (3), when carrying out article analysis, it is necessary to rescan measuring cell, obtain every time
meas1、meas2、···；But the update mode of meas0 can be set according to practical situation, appoint from following several ways
Choosing one:
Mode one: all obtain when every time analyzing；
Mode two: obtain for 0.5～8 hour in regular intervals；
Mode three: whether occur drift and distortion to decide whether to update meas0, if baseline drift is tight according to spectrum
Weight, or there is baseline distortion, then reacquire meas0；Otherwise, meas0 keeps constant.
Mode four: mode two and mode San Tong method are used, i.e. meets one of two conditions, just update meas0；
And rescaning reference cell, before obtaining new meas0, meas0 keeps constant.
Below as a example by the gas ftir analysis with three air chamber switchings, illustrate the present invention's
Embodiment.
Two measurement air chambers of gas componant and concentration on-line optical spectroscopy analysis and background air chamber be connected as in figure 2 it is shown,
Can be to be vertically arranged, such as accompanying drawing 2 (a)；Can also be rounded projections arranged, such as accompanying drawing 2 (b).Two of two measurement air chambers are entered
QI KOU is respectively equipped with an electromagnetic valve 2, and electromagnetic valve 2 is connected with admission line 4 by threeway 3, gives vent to anger for two of two measurement air chambers
Mouth is the most directly connected with the gas outlet of gas circuit by threeway 3, is full of background gas in background air chamber 6.General polarity is divided
Sub-gas on-line analysis is applied, and this background gas is nitrogen.For the present embodiment is as a example by the air chamber connected mode being vertically arranged
Bright embodiments of the present invention.
Shown in the switching device sectional view such as Fig. 3 (a) vertically moving mode and move horizontally, including the first measurement air chamber 1,
Second measures air chamber 11 and background air chamber 6, linear bearing, vertical movement mechanism, limit sensors etc.；Guide rod 13 and bearing block 16
Constituting linear bearing, guide rod 13 is fixedly mounted on floor, and bearing block 16 is fixedly mounted on connection installing plate 19；Motor 7, electricity
Machine mounting seat, screw rod 14, removable nut 15 constitute vertical movement mechanism, and motor 7 is arranged on motor mount, can carry out even
Continuous rotating, motor mount is fixedly mounted on base plate by holding screw 23, and screw rod 14 is solid with the output shaft of motor 7
Connection, removable nut 15 is fixedly mounted on connection installing plate 19；First measures air chamber 1, second measures air chamber 11 and background gas
Room 6 is fixedly mounted in air chamber mounting seat 21, and air chamber mounting seat 21 is fixed by holding screw 23 with being connected installing plate 19
Connect, connect and be also equipped with 16, nut of 3 bearing blocks on installing plate 19.Upper limit sensor 18, lower limit sensor 17
Being fixedly mounted on base 12, the spacing of sensor is adjusted according to the required displacement that vertically moves.When needs are surveyed first
When amount air chamber 1 is switched in light path, controls motor 7 rotating forward and drive screw rod 14 to rotate, and then drive the nut coordinated with screw rod 14
Move up, thus drive connection installing plate 19, first is measured air chamber 1 and moved up along linear bearing center, until the upper limit
Till level sensor 18 detects the signal that puts in place, will move in light path by the first measurement air chamber 1, now, computer sends signal,
Close the electromagnetic valve of the first measurement air chamber 1, open the electromagnetic valve of the second measurement air chamber 11；After scanning through spectrum, control motor anti-
Turn 19, two measurement air chambers of drive connection installing plate to move down along linear bearing center, until lower limit sensor 17 is examined
Till measuring the signal that puts in place, i.e. measuring air chamber 11 second and be switched in light path, now, computer sends signal, closes second
Measure the electromagnetic valve of air chamber 11, open the electromagnetic valve of the first measurement air chamber 1.So, go round and begin again so that spectrogrph carries out spectrum
During scanning, gas componant and concentration thereof in air chamber are stable.
Shown in switching device schematic diagram such as Fig. 3 (b) of continuous rotary mode, there are two axles, this axle in the centre of three air chambers
Tighten together with three air chambers, be connected with between outside.Additionally, the middle part of three air chambers passes from a gear wheel 10,
Motor 7 rotates under the control of industrial computer etc., and little gear 8 is coaxially connected with motor 7, thus same with motor 7
Step rotates, and gear wheel 10, under the driving of this little gear 8, produces and rotates.Owing to the amount of feeding of motor 7 is the shape with pulse
Formula is given, and motor 7 inherently can identify the Angle Position of self rotor.Therefore, in three air chambers any one
With by, in the impulsive switched of industrial computer transmission respective numbers to light path, being switched to another air chamber required pulse from an air chamber
Quantity, can be determined by test.Owing to three air chambers become 120 degree each other, the most also can be by the Angle Position of motor 7
Determine.If with the motor direction of arrow in scheming as positive direction, first measures air chamber 1 in the optical path, then by reversion 120 degree,
Second measurement air chamber 11 is switched in light path, is further continued for inverting 120 degree, then background air chamber 6 can be switched in light path.To
Again measure air chamber 1 first and switch in light path, then rotate forward 240 degree.
Before carrying out the spectrum analysis of gas, three air chambers are filled with nitrogen, then according to above-mentioned handoff functionality, depend on
Secondary three air chambers are switched in light path of optical spectrometer, and scan and obtain using spectrum that light intensity is output as background spectrum, three
Background spectrum is respectively designated as Back0, Back1 and Back2.Wherein Back0 is the spectrum of background air chamber 6, Back1 and Back2
It is respectively the first measurement air chamber 1 and background spectrum of the second measurement air chamber 11.
During carrying out spectrochemical analysis for gases, measuring and be full of gas to be measured in air chamber, first measures air chamber 1 cuts light path
Time, it and gas circuit cut-out, second measures air chamber 11 cuts gas circuit, carries out gas replenishment.Spectrogrph is measured air chamber 1 to first and is carried out
Spectral scan, obtains the spectrum Meas1 being output with light intensity, the most again the second measurement air chamber 11 is cut light path, survey first
Gas circuit cut by amount air chamber 1.Spectrogrph is measured air chamber 11 to second and is carried out spectral scan, obtains the spectrum being output with light intensity
Meas2.If (in 2 hours) complete the acquisition of Back0, Back1 and Back2 and Meas1 and Meas2 in the short time, then press
Formula (3) processes:
Absorbi=-log (measi/Backi), wherein i=1,2 formulas (3)
Obtain Absorb1 and Absorb2.If the time longer (more than 3 hours), then after obtaining Meas1 and Meas2,
Again air chamber 3 is cut light path, reacquires Meas0, process by formula (2), it is thus achieved that Absorb1 and Absorb2.If the time
In 2～3 hours, user can selecting type (2) or formula (3) process voluntarily.
Background air chamber 6 and the first measurement air chamber 1 obtain Back0, Back1, and Meas0 and Meas1 is as shown in Figure 4.From
Figure is it can be seen that Back0 and Meas0 essentially coincides, Back1 and Meas1 essentially coincides, and this explanation spectrogrph preheating is fully, real
Test program no problem；The strength difference of Back0 and Back1 is relatively big, and the light intensity of Back1 is about the 2/3 of Back0, this explanation two
The window absorption difference of individual air chamber is relatively big, measures the window of air chamber, stronger to Infrared spectra adsorption entirety.
Distinguish the most as shown in Figure 5 with the spectrum that absorbance is output according to what formula (2) and (1) obtained respectively
Absorbance1 and Absorbance2.As can be seen from Figure 5: the baseline value of Absorbance1 is essentially 0, and
The baseline of Absorbance2 then has significantly inclination, along with wave number is from 4000cm-1It is reduced to 400cm-1, absorbance increases from 0.13
Big to about 0.3, and baseline not straight line, at 1000cm-1To 1200cm-1In the range of, there are three peaks the most down,
The spectrum baseline drift that this explanation obtains according to formula (1) is relatively big, and has distortion, and the spectrum baseline obtained according to formula (2) is non-
Routine then, the spectrum obtained compared to formula (1), the deviation that the drift of baseline brings can be avoided with distortion.
Obtain the time interval of Meas0, can determine according to practical situation, Fixed Time Interval can be set, it is also possible to be logical
The confirmation certainly crossing spectrum decides whether to carry out reacquiring Meas0.If it find that baseline is distorted, then by background gas
Room switches to reacquire in light path Meas0, and otherwise, Meas0 keeps constant.Whether baseline is distorted, and its decision method is joined
See patent of invention " Fourier transform infrared spectrum distortion identification and processing method (ZL201010268039.3) ".
Relative to prior art, the present invention at least has the advantages that
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis that the present invention provides reads and the method processed, and solves various
The optical absorption characteristics of the parameter in product pond, particularly window cannot be completely secured unanimously, uses routine reference spectrum comparison easily to draw
Play spectrum baseline drift, even distort, thus cause analysis result problem bigger than normal；The drift avoiding baseline brings with distortion
Deviation, substantially increase precision of analysis (measure spectrum divided by background spectrum obtain with absorbance be output light
Spectrum, the negative value of the common logarithm value of this spectrum, it is the spectrum being output with absorbance, in the spectrum analysis of Multi-example pond, with survey
Amount air chamber obtains the spectrum that spectrum scans divided by background air chamber, obtains the spectrum being output with absorbance, due to two air chamber windows
The difference of sheet parameter so that both difference has been treated as absorption spectrum, so that baseline drifts about, even distorts.This
The method that invention proposes is to pass through, and then two air chambers each scanning background spectrum and measure spectrum seek the difference of absorption spectrum,
Rather than be directly divided by with two conventional air chambers and to obtain spectrum, therefore the difference of window is just no longer contained in baseline)；With
Time, when can solve to rescan background spectrum, data are easily lost, the problem that real-time is poor.
Further, if thinking time-consuming, can set, according to practical situation, the mode updating meas0, easy to operate.
Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert
The detailed description of the invention of the present invention is only limitted to this, for general technical staff of the technical field of the invention, is not taking off
On the premise of present inventive concept, it is also possible to make some simple deduction or replace, all should be considered as belonging to the present invention by institute
The claims submitted to determine scope of patent protection.
Claims (10)
1. the spectrum of a Multi-example pond quantitative spectrochemical analysis reads and processing method, it is characterised in that: comprise the following steps:
(1) sample cell being divided into reference cell and measuring cell, reference cell is denoted as 0, measuring cell is denoted as 1 successively, 2, N；
(2) reference cell and all of measuring cell are full of reference substance, and according to the mode scanning optical spectrum of background spectrum, are distinguished
It is denoted as the spectrum being output with light intensity of Back0, Back1, Back2, Back N；Wherein Back0 represents reference
The spectrum obtained is scanned in pond, and Back1 represents the spectrum obtaining No. 1 measuring cell scanning, other the like；
(3) reference substance in sample cell is replaced by analysans, then reference cell and measuring cell are cut in light path successively, carry out
Spectral scan, obtains being respectively designated as the spectrum being output with light intensity of meas0, meas1, meas2, meas N；Its
Middle meas0 represents the spectrum obtaining reference cell scanning, and meas1 represents the spectrum obtaining No. 1 measuring cell scanning, and other is successively
Analogize；
(4) carry out spectral manipulation according to following formula (2), obtain the absorption spectrum being output with absorbance；
Absorbi=-log (measi/Backi)+log (meas0/Back0), wherein i=1,2, N formula (2), formula
Middle Absorbi is the absorption spectrum being output with absorbance of measuring cell i.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis the most according to claim 1 reads and processing method, its feature
It is: the described background spectrum in step (2) is with wave number as transverse axis, the spectrum with light intensity as the longitudinal axis.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis the most according to claim 1 reads and processing method, its feature
It is: in the light path of described step (3), each only one of which sample cell.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis the most according to claim 1 reads and processing method, its feature
Be: in described step (3), carry out article when analyzing, it is necessary to rescan measuring cell every time, obtain meas1,
meas2、···measN；But the update mode of meas0 can be set according to practical situation.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis the most according to claim 4 reads and processing method, its feature
It is: the update mode of described meas0 can be chosen any one kind of them from following several ways:
Mode one: all obtain when every time analyzing；
Mode two: obtain in regular intervals；
Mode three: according to spectrum from confirmation situation decide whether obtain；
Mode four: mode two and mode San Tong method are used, i.e. meets one of two conditions, just update meas0；
And rescaning reference cell, before obtaining new meas0, meas0 keeps constant.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis the most according to claim 5 reads and processing method, its feature
Be: described spectrum from confirmation situation be: according to spectrum whether occur drift and distortion decide whether to update
, if baseline drift is serious, or there is baseline distortion, then reacquire meas0 in meas0；Otherwise, meas0 keeps constant.
7. the spectrum of a Multi-example pond quantitative spectrochemical analysis reads and the device processed, it is characterised in that: include a background
Gas air chamber (6), multiple measurement gas air chamber (1,2), support background gas air chamber and the base of measurement gas air chamber, drive respectively
What dynamic measurement gas air chamber moved and rotated vertically moves drive mechanism and rotational motion mechanism, and described base is installed further
There is upper limit sensor and the lower limit sensor inductively measuring gas air chamber position；Admission line by pipeline adapting device with
The gas inlet of multiple measurement gas air chambers connects, and the gas outlet of each measurement gas air chamber passes through pipeline adapting device
Being connected with outlet pipe, described pipeline adapting device includes M+1 interface, wherein, and interface and admission line or go out
Feed channel connects, and remaining M interface is connected with the gas inlet measuring gas air chamber or gas outlet respectively.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis the most according to claim 7 reads and the device processed, and it is special
Levy and be: described rotational motion mechanism includes motor and is motor driven and intermeshing little gear and gear wheel, its
In, multiple measurement gas air chambers pass from described gear wheel.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis the most according to claim 7 reads and the device processed, and it is special
Levying and be: the described drive mechanism that vertically moves includes motor, screw rod and travelling nut, described motor is solid by motor mount
Being scheduled on base, described screw rod is fixing with the output shaft of motor to be connected, and described travelling nut coordinates installation with screw rod.
The spectrum of a kind of Multi-example pond quantitative spectrochemical analysis the most according to claim 9 reads and the device processed, and it is special
Levying and be: farther included connection installing plate, described travelling nut is arranged on connection installing plate；Described measurement gas air chamber
Being fixedly mounted in air chamber mounting seat with background gas air chamber, air chamber mounting seat fixes connection by screw with being connected installing plate.
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