CN106482651A - A kind of method that capsule housing thickness is measured based on terahertz time-domain spectroscopic technology - Google Patents
A kind of method that capsule housing thickness is measured based on terahertz time-domain spectroscopic technology Download PDFInfo
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- CN106482651A CN106482651A CN201611024442.5A CN201611024442A CN106482651A CN 106482651 A CN106482651 A CN 106482651A CN 201611024442 A CN201611024442 A CN 201611024442A CN 106482651 A CN106482651 A CN 106482651A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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Abstract
The invention discloses a kind of method that capsule housing thickness is measured based on terahertz time-domain spectroscopic technology, comprise the following steps：Set up capsule housing thickness measure model；When known to the refractive index of capsule housing to be measured, then no longer carry out the test of the refractive index of capsule housing to be measured, otherwise, carry out the test of the refractive index of capsule housing to be measured；The delay-time difference Δ t of the upper and lower surface reflection peak of capsule housing of measurement testing sample；According to the capsule housing thickness setting up capsule housing thickness measure model calculating testing sample.The method of the present invention do not destroy with do not contact capsule shells in the case of, high precision measurement goes out the thickness of capsule housing.On-line monitoring and management for realizing capsule housing quality provide technical support, preferably service medical quality inspection industry.
Description
Technical field
The present invention relates to medicine quality detection field is and in particular to a kind of measure capsule based on terahertz time-domain spectroscopic technology
The method of thickness of shell.
Background technology
The appearance of capsule solves the problems, such as that people take medicine poor taste, ensure that good assimilation effect simultaneously.Different diseases
Feelings require drug effect off-position in human body different, the speed of drug effect release also will necessarily be required simultaneously.When capsule thickness of the shell
When less, drug release is too fast, and human body cannot fully absorb；When capsule thickness of the shell is larger, human body is to medicine also not fully
Absorption, will be excreted.In the production process of capsule shells, the thickness to capsule shells of certain frequency is needed to examine
Test.
How capsule housing quality test at present is completed using contact type measurement, and exists many during contact type measurement
Individual problem, such as：Certainty of measurement is relatively low, measuring state is unstable, is vulnerable to the interference of external shock it is often more important that cannot meet
The detection of full-automatic capsule production line needs.Work out accurately, fast and automatically have with nondestructive method of testing very real
Meaning.
Content of the invention
For solving the deficiency that prior art exists, the invention discloses a kind of measure glue based on terahertz time-domain spectroscopic technology
The method of softgel shell body thickness, the purpose of the said method of the present invention be do not destroy with do not contact capsule shells in the case of, in high precision
Test out the thickness of capsule housing.
For achieving the above object, the concrete scheme of the present invention is as follows：
A kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology, comprises the following steps：
Set up capsule housing thickness measure model：When THz wave vertical incidence is to capsule housing surface, capsule housing
Relation between the delay-time difference Δ t of the upper and lower surface reflection peak of geometric thickness d and capsule housing meets following equations：WithCan derive：Wherein, v is THz wave spread speed in capsule housing, and n is capsule
The refractive index of housing, c is the light velocity in vacuum；
When known to the refractive index of capsule housing to be measured, then no longer carry out the survey of the refractive index of capsule housing to be measured
Examination, otherwise, carries out the test of the refractive index of capsule housing to be measured；
The delay-time difference Δ t of the upper and lower surface reflection peak of capsule housing of measurement testing sample；
According to setting up capsule housing thickness measure modelCalculate the capsule housing thickness of testing sample.
Further, above-mentioned a kind of based on terahertz time-domain spectroscopic technology measure capsule housing thickness method also include sample
The step that product prepare, takes capsule housing sample to be measured to pour out capsule medicated core, cuts off capsule shells, and flattening-out is used for accurate test glue
Softgel shell body refractive index n, another preparation hollow capsule, for testing its thickness of shell.
Further, carry out capsule housing to be measured the test of refractive index when, take out capsule housing to be measured sample, will
Capsule medicated core is poured out, and cuts off capsule housing flattening-out；Using the transmissive mode of operation of terahertz time-domain spectroscopy system, pass through respectively
Experiment records reference signal E when not placing flattening-out capsule shellsref(t), and through placing flattening-out capsule housing with reference to THz time domain arteries and veins
Rush waveform, i.e. sample signal Esam(t)；
Respectively time domain reference signal and sample signal are carried out with Fourier's change and obtains their frequency spectrum Eref(ω)With
Esam(ω), obtain refractive index n of tested capsule housing.
Further, in order to improve accuracy and the degree of accuracy of refractometry, by the capsule housing sample of flattening-out not
With position measurement repeatedly, average as final refractive index.
Further, by Capsuleses housing to be measured, it is placed on test platform.Terahertz time-domain spectroscopy system is adjusted
During the delay-time difference Δ t of the whole upper and lower surface reflection peak to reflective operation pattern, recording Capsuleses housing, measurement obtains
The terahertz pulse spectrogram of capsule housing sample, according to the terahertz pulse spectrogram of capsule housing sample, records capsule shells
Body upper and lower surface reflected signal temporal information t1、t2；By formula Δ t=t2-t1；Obtain capsule shells delay-time difference Δ t.
Further, when measurement obtains the terahertz pulse spectrogram of capsule housing sample, to need in measurement process to adjust
Whole terahertz pulse is popped one's head in a distance from capsule housing it is ensured that terahertz pulse vertical incidence, simultaneously Capsuleses surface of shell
On terahertz signal focal plane.
Further, described guarantee terahertz pulse vertical incidence, Capsuleses surface of shell is in terahertz signal simultaneously
On focal plane, concrete grammar is：Open guide light on test signal terahertz pulse transmitting probe so that Terahertz accurately hangs down
Directly incident Capsuleses housing, the distance away from Capsuleses for the fine setting terahertz sources probe, observes the survey that host computer shows up and down
Examination waveform, when signal intensity is maximum, illustrates Capsuleses on the focal plane that terahertz sources are popped one's head in.
Further, in order to improve accuracy and the degree of accuracy of capsule shells delay-time difference, by Capsuleses in different positions
Put measurement repeatedly, average as final time difference Δ t.
Further, described terahertz time-domain spectroscopy system is the terahertz time-domain spectroscopy device of reflection-type, for producing
With detection Terahertz, the frequency range of terahertz pulse is 0.1～2THz.
Beneficial effects of the present invention：
The method of the present invention do not destroy with do not contact capsule shells in the case of, high precision measurement goes out the thickness of capsule housing.
On-line monitoring and management for realizing capsule housing quality provide technical support.The method certainty of measurement is higher, measuring state is steady
Fixed, it is not easily susceptible to the interference of external shock, more importantly this technology meets the detection needs of full-automatic capsule production line, can be more preferable
Service medicine quality inspection industry.
Brief description
Fig. 1 method of the present invention implementing procedure figure；
The reflective theory diagram of test system that Fig. 2 present invention is utilized；
Fig. 3 capsule, housing refraction index test result schematic diagram；
Fig. 4 capsule shells sample time domain signal schematic representation.
Specific embodiment：
The present invention is described in detail below in conjunction with the accompanying drawings：
Present invention experiment uses time-domain spectroscopy system FiCO of Zomega company of the U.S., as shown in Fig. 2 producing and visiting
The method surveying Terahertz is respectively photoconductive antenna and electro optic sampling.The frequency range of terahertz pulse is 0.1～2THz, system
It is main that by femto-second laser, time delay system, terahertz sources head (photoconductive antenna) and Terahertz reception head, (electric light is brilliant
Body) composition.
The femtosecond laser that femto-second laser sends is divided into two bundles through beam splitter, and beam of laser is laggard through photoconductive antenna
Enter paraboloidal mirror, the light beam after paraboloidal mirror respectively enters convex lenss and another paraboloidal mirror, and another beam of laser is through prolonging
Enter plane mirror after platform late, enter described another paraboloidal mirror under the refraction of plane mirror, sequentially pass through High Resistivity Si, electric light afterwards
Crystal, lens, quarter wave plate, wollaston prism and detection electro-optic crystal.
The principle of wherein electro optic sampling is：In electro-optic detection, detection light and the terahertz emission of linear polarization collinearly lead to
Cross the crystal with electrooptic effect.The electric field of terahertz emission changes the coefficient of refraction of crystal so that crystal have double
The property of refraction.After Terahertz electric field is had an effect, its polarization properties is changed into elliptical polarization to the detection light of therefore linear polarization.Survey
The ellipse degree of bias souning out light-metering can obtain the electric field intensity of terahertz emission.Because terahertz emission and detection light all have pulse
Form, and in an experiment detect light pulse width be considerably shorter than terahertz pulse cycle of oscillation, change direct impulse and
Time relationship between terahertz pulse is it is possible to be adopted the time waveform of terahertz emission using the polarization variations of direct impulse
Collection is out.
It is in constant temperature, the constant humidity environment of a relative closure during test system work, reduce test environment as far as possible to survey
The impact of examination.
As shown in figure 1, a kind of method that capsule housing thickness is measured based on terahertz time-domain spectroscopic technology, walk including following
Suddenly：
(1) preparation of samples：Capsule housing sample used is the Ganmaokang Capsule of sunflower Pharmaceutical, and capsule medicated core is poured out.
Cut off capsule shells, flattening-out is used for accurate test capsule housing refractive index n.Another preparation 1 hollow capsule is thick for testing its housing
Degree.
(2) sample refraction index test
Open terahertz time-domain spectroscopy system, it is transmission mode that adjustment receiving transducer position makes system operating mode.For
Ensure test data stability, equipment measured after preheating half an hour.The capsule housing of flattening-out is placed in and can achieve that two dimension is flat
On the device moving, click on PC control software and start to test, read the information of PC control software collection, data message
Preserve, using matlab software analysis terahertz time-domain spectroscopy data.In order to improve accuracy and degree of accuracy, by the capsule of flattening-out
Shell specimens measure 3-5 time in diverse location, average as final refractive index.
(3) Capsuleses shell delay-time difference Δ t
First terahertz time-domain spectroscopy system call interception to reflective operation pattern, hollow capsule housing is placed in can be real
On the device of existing two-dimension translational, click on PC control software and start to test, read the information of PC control software collection,
Data message preserves, using matlab software analysis terahertz time-domain spectroscopy data.To need in measurement process to adjust Terahertz
Probe pulse is with a distance from capsule housing it is ensured that terahertz pulse vertical incidence, simultaneously Capsuleses surface of shell are in Terahertz
On signal transmitting probe focal plane.This needs to open guide light on test signal terahertz pulse transmitting probe so that terahertz
Hereby accurate vertical incidence Capsuleses housing, the distance away from Capsuleses for the fine setting terahertz sources probe, observes host computer up and down
The test waveform of display, when signal intensity is maximum, illustrates Capsuleses on the focal plane that terahertz sources are popped one's head in.Will be clearly
According to spectrum analysis：From the terahertz pulse spectrogram of capsule housing sample as shown in Figure 3 it can be seen that capsule housing upper,
There is obvious time difference Δ t between lower surface reflection peak.In order to improve accuracy and degree of accuracy, by Capsuleses in different positions
Put measurement 3-5 time.Average as final time difference Δ t.
(4) data processing obtains Capsuleses thickness
As shown in figure 4, extracting the time difference Δ between reflection peak from the terahertz pulse spectroscopic data of the sample obtaining
T, according to the refractive index n information of sample in the refractive index data storehouse of the sample pre-building, using capsule housing thickness measure mould
TypeCalculate the capsule housing thickness d of sample.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (9)
1. a kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology, is characterized in that, comprise the following steps：
Set up capsule housing thickness measure model：When THz wave vertical incidence is to capsule housing surface, capsule housing geometry
Relation between the delay-time difference Δ t of the upper and lower surface reflection peak of thickness d and capsule housing meets following equations：
WithCan derive：Wherein, v is THz wave spread speed in capsule housing, and n is the folding of capsule housing
Penetrate rate, c is the light velocity in vacuum；
When known to the refractive index of capsule housing to be measured, then no longer carry out the test of the refractive index of capsule housing to be measured, no
Then, carry out the test of the refractive index of capsule housing to be measured；
The delay-time difference Δ t of the upper and lower surface reflection peak of capsule housing of measurement testing sample；
According to setting up capsule housing thickness measure modelCalculate the capsule housing thickness of testing sample.
2. a kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology as claimed in claim 1, it is special
Levying is, the step also including preparation of samples based on the method that terahertz time-domain spectroscopic technology measures capsule housing thickness, takes to be measured
Capsule housing sample capsule medicated core is poured out, cut off capsule shells, flattening-out is used for accurate test capsule housing refractive index n, separately accurate
Standby hollow capsule, for testing its thickness of shell.
3. a kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology as claimed in claim 1, it is special
Levying is, during the test of the refractive index carrying out capsule housing to be measured, takes out the sample of capsule housing to be measured, capsule medicated core is fallen
Go out, cut off capsule housing flattening-out；
Using the transmissive mode of operation of terahertz time-domain spectroscopy system, record ginseng when not placing flattening-out capsule shells respectively by experiment
Examine signal Eref(t), and through placing flattening-out capsule housing with reference to THz time domain impulse waveform, i.e. sample signal Esam(t)；
Respectively time domain reference signal and sample signal are carried out with Fourier's change and obtains their frequency spectrum Eref(ω)And Esam(ω), obtain
Obtain refractive index n of tested capsule housing.
4. a kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology as claimed in claim 3, it is special
Levying is, in order to improve accuracy and the degree of accuracy of refractometry, the capsule housing sample of flattening-out is measured many in diverse location
Secondary, average as final refractive index.
5. a kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology as claimed in claim 1, it is special
Levying is, during the delay-time difference Δ t of the upper and lower surface reflection peak of capsule housing of measurement testing sample, by terahertz time-domain spectroscopy
To reflective operation pattern, measurement obtains the terahertz pulse spectrogram of capsule housing sample to system call interception, according to capsule housing
The terahertz pulse spectrogram of sample, records capsule housing upper and lower surface reflected signal temporal information t1、t2；By formula Δ t=
t2-t1；Obtain capsule shells delay-time difference Δ t.
6. a kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology as claimed in claim 5, it is special
Levying is, when measurement obtains the terahertz pulse spectrogram of capsule housing sample, will need to adjust terahertz pulse in measurement process
Pop one's head in a distance from capsule housing it is ensured that terahertz pulse vertical incidence, simultaneously Capsuleses surface of shell are in terahertz signal
On focal plane.
7. a kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology as claimed in claim 6, it is special
Levying is, described guarantee terahertz pulse vertical incidence, simultaneously Capsuleses surface of shell on terahertz signal focal plane, specifically
Method is：Open guide light on test signal terahertz pulse transmitting probe so that the incident hollow glue of Terahertz accurate vertical
Softgel shell body, the distance away from Capsuleses for the fine setting terahertz sources probe, observes the test waveform that host computer shows up and down, and signal is strong
When degree is maximum, illustrate Capsuleses on the focal plane that terahertz sources are popped one's head in.
8. a kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology as claimed in claim 5, it is special
Levying is, in order to improve accuracy and the degree of accuracy of capsule shells delay-time difference, by Capsuleses in diverse location measurement repeatedly, takes
Meansigma methodss are as final time difference Δ t.
9. a kind of method measuring capsule housing thickness based on terahertz time-domain spectroscopic technology as claimed in claim 1, it is special
Levying is, described terahertz time-domain spectroscopy system is the terahertz time-domain spectroscopy device of reflection-type, for producing and detecting Terahertz,
The frequency range of terahertz pulse is 0.1～2THz.
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Cited By (12)
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| CN107233076A (en) * | 2017-05-24 | 2017-10-10 | 西北核技术研究所 | A kind of insertion type is in the real-time tumor imaging method of body and system |
| CN107764195A (en) * | 2017-10-09 | 2018-03-06 | 长春理工大学 | Coating high accuracy thickness detecting method based on Fresnel matrix THz ripple propagation models |
| CN108398096A (en) * | 2018-04-11 | 2018-08-14 | 青岛万龙智控科技有限公司 | The reflective On-line Measuring Method of THz wave of wirecord fabric thickness |
| CN109059786A (en) * | 2018-09-07 | 2018-12-21 | 西安航天化学动力厂 | The method of non-contact testing solid propellant rocket internal insulation thickness |
| CN109115690A (en) * | 2018-09-07 | 2019-01-01 | 中国人民解放军国防科技大学 | Real-time polarization sensitive terahertz time-domain ellipsometer and optical constant measuring method |
| CN110243296A (en) * | 2019-06-21 | 2019-09-17 | 上海理工大学 | The damage-free measuring apparatus and method of pearl pearl thickness degree |
| CN110542387A (en) * | 2019-10-15 | 2019-12-06 | 云南电网有限责任公司电力科学研究院 | insulating material thickness detection method and system based on terahertz propagation characteristics |
| CN110702997A (en) * | 2019-11-12 | 2020-01-17 | 中国电子科技集团公司第四十一研究所 | High-temperature material dielectric property testing method and system based on time domain technology |
| CN110797272A (en) * | 2018-08-01 | 2020-02-14 | 北京铂阳顶荣光伏科技有限公司 | Chip cutting method and chip cutting device |
| CN111276414A (en) * | 2020-02-03 | 2020-06-12 | 长江存储科技有限责任公司 | Detection method and device |
| CN111998783A (en) * | 2020-07-13 | 2020-11-27 | 北京工业大学 | Reflection type terahertz time-domain spectrum thickness measurement method based on evolutionary optimization algorithm |
| CN114894105A (en) * | 2022-05-16 | 2022-08-12 | 西南科技大学 | Method and system for measuring thickness of non-metallic material in atmospheric environment |
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|---|---|---|---|---|
| CN107233076B (en) * | 2017-05-24 | 2018-02-23 | 西北核技术研究所 | A kind of insertion type is in the real-time tumor imaging system of body |
| CN107233076A (en) * | 2017-05-24 | 2017-10-10 | 西北核技术研究所 | A kind of insertion type is in the real-time tumor imaging method of body and system |
| CN107764195B (en) * | 2017-10-09 | 2019-12-20 | 长春理工大学 | Coating thickness detection method based on Fresnel matrix THz wave propagation model |
| CN107764195A (en) * | 2017-10-09 | 2018-03-06 | 长春理工大学 | Coating high accuracy thickness detecting method based on Fresnel matrix THz ripple propagation models |
| CN108398096A (en) * | 2018-04-11 | 2018-08-14 | 青岛万龙智控科技有限公司 | The reflective On-line Measuring Method of THz wave of wirecord fabric thickness |
| CN110797272B (en) * | 2018-08-01 | 2022-08-26 | 上海祖强能源有限公司 | Chip cutting method and chip cutting device |
| CN110797272A (en) * | 2018-08-01 | 2020-02-14 | 北京铂阳顶荣光伏科技有限公司 | Chip cutting method and chip cutting device |
| CN109059786A (en) * | 2018-09-07 | 2018-12-21 | 西安航天化学动力厂 | The method of non-contact testing solid propellant rocket internal insulation thickness |
| CN109115690A (en) * | 2018-09-07 | 2019-01-01 | 中国人民解放军国防科技大学 | Real-time polarization sensitive terahertz time-domain ellipsometer and optical constant measuring method |
| CN109115690B (en) * | 2018-09-07 | 2024-04-26 | 中国人民解放军国防科技大学 | Terahertz time domain ellipsometer sensitive to real-time polarization and optical constant measurement method |
| CN110243296A (en) * | 2019-06-21 | 2019-09-17 | 上海理工大学 | The damage-free measuring apparatus and method of pearl pearl thickness degree |
| CN110542387A (en) * | 2019-10-15 | 2019-12-06 | 云南电网有限责任公司电力科学研究院 | insulating material thickness detection method and system based on terahertz propagation characteristics |
| CN110702997A (en) * | 2019-11-12 | 2020-01-17 | 中国电子科技集团公司第四十一研究所 | High-temperature material dielectric property testing method and system based on time domain technology |
| CN111276414A (en) * | 2020-02-03 | 2020-06-12 | 长江存储科技有限责任公司 | Detection method and device |
| CN111998783A (en) * | 2020-07-13 | 2020-11-27 | 北京工业大学 | Reflection type terahertz time-domain spectrum thickness measurement method based on evolutionary optimization algorithm |
| CN111998783B (en) * | 2020-07-13 | 2021-12-31 | 北京工业大学 | Reflection type terahertz time-domain spectrum thickness measurement method based on evolutionary optimization algorithm |
| CN114894105A (en) * | 2022-05-16 | 2022-08-12 | 西南科技大学 | Method and system for measuring thickness of non-metallic material in atmospheric environment |
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