CN107219187A - A kind of leather species fast non-destructive detection method based on terahertz light spectral technology - Google Patents
A kind of leather species fast non-destructive detection method based on terahertz light spectral technology Download PDFInfo
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- 239000010985 leather Substances 0.000 title claims abstract description 89
- 238000001514 detection method Methods 0.000 title claims abstract description 45
- 238000005516 engineering process Methods 0.000 title claims abstract description 18
- 230000003595 spectral effect Effects 0.000 title claims abstract description 16
- 230000001066 destructive effect Effects 0.000 title claims abstract description 12
- 239000000523 sample Substances 0.000 claims abstract description 109
- 238000001228 spectrum Methods 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 238000010521 absorption reaction Methods 0.000 claims abstract description 20
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 239000012496 blank sample Substances 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 238000012935 Averaging Methods 0.000 claims abstract 2
- 230000009466 transformation Effects 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 11
- 229920000573 polyethylene Polymers 0.000 claims description 10
- 238000000844 transformation Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 241000894007 species Species 0.000 description 14
- 241001465754 Metazoa Species 0.000 description 8
- 241001494479 Pecora Species 0.000 description 4
- 241000282898 Sus scrofa Species 0.000 description 4
- 241000282346 Meles meles Species 0.000 description 3
- 241000772415 Neovison vison Species 0.000 description 3
- 241000283973 Oryctolagus cuniculus Species 0.000 description 3
- 241000009328 Perro Species 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 241000283690 Bos taurus Species 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012850 discrimination method Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 239000012472 biological sample Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002649 leather substitute Substances 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000004597 plastic additive Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 210000000697 sensory organ Anatomy 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a kind of leather species fast non-destructive detection method based on terahertz light spectral technology, its step is as follows.S1：Prepare and be adapted to the detection support that tera-hertz spectra detects leather sample；S2：Measure the thickness of leather sample to be measured；S3：Blank sample detection support is measured, reference terahertz time-domain spectroscopy signal is obtained；Measure and obtain the sample terahertz time-domain spectroscopy signal that support is detected equipped with testing sample；The tera-hertz spectra characteristic parameter for obtaining sample is calculated using formula, absorption coefficient, refractive index is included；S4：Repeatedly measurement same sample different loci, calculates characteristic parameter, and reduction error of averaging obtains the average value of the tera-hertz spectra characteristic parameter of testing sample；S5：The leather Terahertz characteristic spectrum database for comparing structure formation determines leather species.This method is quick, unmarked, not damaged, the simple to operate, scope of application, the person's subjective impact that can overcome detection and identification, the species of tested leather and leather and fur products can be objectively responded.
Description
Technical field
The invention belongs to leather species detection technical field, more particularly to a kind of leather kind based on terahertz light spectral technology
Class fast non-destructive detection method.
Background technology
Existing leather and leather products qualitative analysis and the true and false differentiate main using sense organ discrimination method, that is, adopt completely
With soon, the method touched of hand differentiated that this method requires that discriminating personnel have abundant authentication technique and experience, unavoidably
Can be by identification person's subjective impact.In addition, also by detection sample marker DNA or the detection side of other feature large biological molecules
Method, but possibility that is costly and equally existing infringement sample.
The content of the invention
The purpose of the present invention be exactly in order to overcome the shortcomings of above-mentioned background technology there is provided one kind be based on terahertz light spectral technology
Leather species fast non-destructive detection method.This is one kind person's subjective impact that can overcome detection and identification, can objectively respond tested skin
The species of leather and leather and fur products, and the animal fur type discriminating inspection of any damage will not be produced to being detected leather or leather and fur products
Survey method.
A kind of the step of leather species fast non-destructive detection method based on terahertz light spectral technology involved in the present invention
It is as follows：
S1：Prepare and be adapted to the detection support that tera-hertz spectra detects leather sample；
S2：Measure the thickness of leather sample to be measured；
S3：Blank sample detection support is measured, reference terahertz time-domain spectroscopy signal is obtained；Measure and obtain equipped with to be measured
The sample terahertz time-domain spectroscopy signal of sample detection support；The terahertz light spectrum signature ginseng for obtaining sample is calculated using formula
Number, comprising but not only include absorption coefficient, refractive index；
S4：Repeatedly the terahertz time-domain spectroscopy signal of measurement same sample diverse location, calculates characteristic parameter, averages
Reduce error, obtain the average value of the tera-hertz spectra characteristic parameter of testing sample；
S5：The leather Terahertz characteristic spectrum database for comparing structure formation determines leather species.
Further, the detection support includes intermediate plate and tightening knob；Intermediate plate is the same polythene strip with holes of two panels, hole
Footpath is more than or equal to 2cm, is placed in leather sample is open and flat when using in the middle of two panels polythene strip with holes, is fixed, used using intermediate plate
Tightening knob is tightened, and forms " sandwich " structure.
Further, 2cm may be selected in the thickness of piece polyethylene piece.
Further, the thickness of measurable " sandwich " structure of thickness of the measurement leather sample to be measured, directly subtracts two
The thickness of piece intermediate plate is thickness of sample.
Further, described S3, S4 specific survey calculation method is, by the detection support of blank sample and equipped with treating test sample
Product examine is surveyed support and is sequentially placed into transmission-type terahertz time-domain spectroscopy device, and the detection support of blank sample is obtained respectively and is equipped with
Testing sample detects the terahertz time-domain spectroscopy signal of support；Using the former signal as reference signal, the latter is used as sample signal
Fourier transformation is carried out respectively obtains the information such as corresponding Terahertz frequency-domain waveform, amplitude；In order to reduce experimental error, with reference to letter
Number and sample signal measurement in triplicate, average；The Terahertz absorption coefficient of leather or the calculating of refractive index are all
The information such as corresponding Terahertz frequency-domain waveform, the amplitude obtained based on the Fourier transformation above with reference to signal and sample signal are obtained
, testing sample refractive index n (f) calculation formula are as follows：
Wherein,Respectively sample spectra energy Is and reference spectra energy Iref carries out Fourier transformation
The terahertz time-domain spectroscopy signal of the phase information obtained afterwards, sample signal and reference signal can be obtained after carrying out Fourier transformation
Sample spectra energy Is and reference spectra energy Iref；C represents the light velocity, and d represents the thickness of sample that Terahertz is penetrated, and f is represented too
The frequency of hertz.
The calculation formula of absorption coefficient (f) is as follows：
Wherein ρ (f) is the amplitude ratio of Is and Iref Fourier transformations, and d represents the thickness that Terahertz penetrates sample, and n (f) is
Refractive index.
Further, the leather Terahertz characteristic spectrum database is obtained not by collecting measurement Known Species leather sample
The Terahertz characteristic spectrum of leather-like sample of the same race, forms the leather Terahertz characteristic spectrum database of large sample；Survey calculation
Method is walked with above-mentioned S1 to S4, and can improve leather sample by constantly obtaining the terahertz light spectrum signature of testing sample
Spectra database.The leather sample terahertz light spectrum information newly collected in S5, which is added to database, can update terahertz light
The accuracy rate of spectrum identification leather sample.
The present invention is the spectrogram that leather is detected with terahertz time-domain spectroscopy system acquisition, and data processing obtains particular types
The Terahertz characteristic spectrum parameter of leather, obtains the Terahertz characteristic spectrum database of leather sample, is had according to specific leather
Particular terahertz hereby spectrum parameter is identified.
The present invention leather species discrimination method use leather sample Terahertz characteristic spectrum parameter, comprising but not only
Only include Terahertz absorption coefficient, refractive index of sample etc..Directly determine to be detected according to the combination of one or more kinds of parameters
The species of leather sample.
The ultimate constituent of natural leather is protein, and the species and ratio of protein contained by different animal skins are equal
There is difference, there is also difference for other constituents (such as water) in addition；Artificial leather is coated by synthesizing tree generally using fabric as base
The mixing material that the various plastic additives of fat addition are made is made.Tera-hertz spectra covers the low-frequency vibration energy level of molecule, to polarity
Material sensitive (such as water).The difference of leather constituent and the difference of content can show its Terahertz characteristic spectrum parameter
On, this is the physical basis of the present invention.
We have found that the Terahertz absorption coefficient of different animals fur, refractive index have obvious difference, therefore according to not
Terahertz characteristic spectrum parameter with species animal skin can distinguish the animal species belonging to different tested furs.The present invention
This detection and discriminating be an objective process, in the absence of human factor, and will not be any to sample itself generation
Infringement.
THz wave refers to electromagnetic wave of the frequency in the range of 0.1-10THz, between microwave and it is infrared between, with it is high thoroughly
Property, low energy, instantaneity, acuteness, high s/n ratio the features such as, these features cause Terahertz non-destructive testing technology biology cure
Many methods such as, biochemistry, chemical industry have critically important application.THz wave covering dielectric nanosecond the fortune to psec yardstick
It is dynamic, the time scale of this exactly large biological molecule low-frequency vibration, therefore terahertz light spectral technology is adapted to the different types of life of detection
Thing macromolecular and the biological sample being made up of different large biological molecules by different proportion.Due to different leather components composition not
Together, its corresponding THz wave characteristic parameter is caused to have differences.So far also not with terahertz time-domain spectroscopic technology come
Detect the Patents and document report of leather and leather products.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is detection support schematic diagram, wherein 1 is intermediate plate, 2 be tightening knob；
Fig. 3 is absorption coefficient figure of the various animals Leather testing sample in the Terahertz of different frequency；
Fig. 4 is index of refraction diagram of the various animals Leather testing sample in the Terahertz of different frequency；
Fig. 5 is the absorption coefficient figure of abortive calfskin, calf-skin and cattle hide test sample in the Terahertz of different frequency；
Fig. 6 is the Terahertz index of refraction diagram of abortive calfskin, calf-skin and cattle hide test sample in different frequency.
Embodiment
Embodiments of the invention are provided below, the preferred embodiments of the present invention are described in detail with reference to accompanying drawing, side
Method flow is as described in Figure 1.
Embodiment 1
The different plant species such as pig, ox, sheep leather differentiate the example of detection.
1st, prepare and be adapted to the detection support that tera-hertz spectra detects leather sample：As shown in Fig. 2 the detection support is included
Intermediate plate 1 and tightening knob 2；Intermediate plate 1 is the same polythene strip with holes of two panels, and aperture is more than or equal to 2cm, by leather sample when using
Product are open and flat to be placed in the middle of two panels polythene strip with holes, is fixed, is tightened using tightening knob 2 using intermediate plate 1, forms " sandwich " knot
Structure.It is respectively 2mm to measure pig, sheep, ox, rabbit, mink, dog, sand badger leather sample thickness；1.5mm；2mm；1.5mm；1.6mm；
1.6mm；2mm；Measuring method is the thickness of measurement " sandwich " structure, and the thickness for directly subtracting two panels intermediate plate is that sample is thick
Degree.In order to ensure the efficiency of transmission of THz wave, while reducing the generation of echo as far as possible, the thickness of piece polyethylene piece may be selected
2cm。
2nd, the detection of sample and signal transacting：The detection support of blank sample is measured, when obtaining the Terahertz of blank reference
Domain spectral signal；Measure and obtain the terahertz time-domain spectroscopy signal that support is detected equipped with testing sample；Calculated and obtained using formula
The tera-hertz spectra characteristic parameter of sample is obtained, absorption coefficient, refractive index is included.Using terahertz time-domain spectroscopy device using transmission
Light path, obtains the detection support of blank sample and the terahertz time-domain spectroscopy signal of support is detected equipped with testing sample respectively；With
The former signal is as reference signal, and the latter detects as sample signal to leather sample, each sample duplicate measurements three
It is secondary.The Terahertz absorption coefficient of leather or the calculating of refractive index are all based on Fu of reference signal achieved above and sample signal
In the information acquisition, testing sample refractive index n (f) calculation formula such as leaf transformation obtained corresponding Terahertz frequency domain amplitude, phase
It is as follows：
Wherein,Respectively sample spectra energy Is and reference spectra energy Iref carries out Fourier transformation
The phase information obtained afterwards, terahertz time-domain spectroscopy signal can obtain spectral energy Is and reference spectra after carrying out Fourier transformation
Energy Iref；C represents the light velocity, and d represents the thickness of sample that Terahertz is penetrated, and f represents the frequency of Terahertz.
The calculation formula of absorption coefficient (f) is as follows：
Wherein ρ (f) is the amplitude ratio of Is and Iref Fourier transformations, and d represents the thickness that Terahertz penetrates sample, and n (f) is
Refractive index.
By the results averaged of three measurements, pig, sheep, ox, rabbit, mink, dog, sand badger leather sample are calculated according to formula
Absorption coefficient in the range of 0.2-1.5THz is linearly increasing, as shown in figure 3, being respectively 18cm at 0.8THz-1；15cm-1；
20cm-1；24cm-1；25cm-1；26cm-1；30cm-1；Pig, sheep, ox, rabbit, mink, dog, sand badger leather sample are in 0.2-1.5THz
In the range of refractive index be held essentially constant；As shown in figure 4, being respectively 1.42 at 0.8THz；1.36；1.54；1.52；
1.452；1.475；1.44.Using variety classes leather sample Terahertz absorption coefficient and refractive index in specific frequency range
Result mapping, as a result as shown in Figure 3, Figure 4；
3rd, the corresponding absorption coefficient of every kind of leather, refractive index are determined, be can determine that not with reference to different terahertz light spectrum informations
Same leather species.
The leather Terahertz characteristic spectrum database obtains variety classes by collecting measurement Known Species leather sample
The Terahertz characteristic spectrum of leather sample, forms the leather Terahertz characteristic spectrum database of large sample；Measuring method is with above-mentioned
Method, and leather sample spectra database can be improved by constantly obtaining the terahertz light spectrum signature of testing sample.Newly
The leather sample terahertz light spectrum information of collection, which is added to database, can update tera-hertz spectra identification leather sample
Accuracy rate.
Embodiment 2
The all ages and classes such as abortive calfskin, calf-skin, ox-hide animal's leather differentiate the example of detection.
The present embodiment provides a kind of side of utilization terahertz time-domain spectroscopic technology to all ages and classes animal's leather sample detection
Method, operating procedure is identical with embodiment 1, simply testing sample be the leather from all ages and classes ox, 1, build be adapted to too
The sample of hertz detection：Leather sample is clamped using two panels polythene strip with holes, " sandwich " detection sample is formed, measures tire ox
Skin, calf-skin, ox-hide thickness of sample are respectively 0.5mm；1mm；1.8mm：
2nd, the detection of sample and signal transacting：Transmitted light path is used also with terahertz time-domain spectroscopy device, with empty sample
Product support is reference, and leather sample is carried out to detect each sample duplicate measurements three times.Calculation formula be the same as Example 1 used.Will
Time domain beamformer progress Fourier transformation is obtained its amplitude collection of illustrative plates, phase collection of illustrative plates etc., root by the results averaged of three measurements
It is linearly increasing that the absorption coefficient of abortive calfskin, calf-skin, ox-hide sample in the range of 0.2-2.0THz is calculated according to formula；Such as Fig. 5 institutes
Show, be respectively 16.5cm at 1THz-1；17cm-1, 20cm-1；Abortive calfskin, calf-skin, ox-hide sample are in 0.2-2.0THz scopes
Interior refractive index increases and reduced with frequency；As shown in fig. 6, being respectively 1.255 at 1THz；1.26；1.324.Utilize difference
The result mapping of concentration species leather sample Terahertz absorption coefficient and refractive index in the specific frequency range of correspondence, such as Fig. 5,
Shown in Fig. 6；Abortive calfskin, calf-skin, the Terahertz absorption coefficient of ox-hide and refractive index gradually increase in 1THz.
3rd, the corresponding absorption coefficient of every kind of leather, refractive index are determined, be can determine that not with reference to different terahertz light spectrum informations
Same leather species.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (6)
1. a kind of leather species fast non-destructive detection method based on terahertz light spectral technology, it is characterised in that step is as follows：
S1：Prepare and be adapted to the detection support that tera-hertz spectra detects leather sample；
S2：Measure the thickness of leather sample to be measured；
S3：Blank sample detection support is measured, reference terahertz time-domain spectroscopy signal is obtained；Measure and obtain equipped with testing sample
Detect the sample terahertz time-domain spectroscopy signal of support；The tera-hertz spectra characteristic parameter for obtaining sample, bag are calculated using formula
Containing absorption coefficient, refractive index；
S4：Repeatedly the terahertz time-domain spectroscopy signal of measurement same sample diverse location, calculates characteristic parameter, reduction of averaging
Error, obtains the average value of the tera-hertz spectra characteristic parameter of testing sample；
S5：The leather Terahertz characteristic spectrum database for comparing structure formation determines leather species to be measured.
2. a kind of leather species fast non-destructive detection method based on terahertz light spectral technology according to claim 1, its
It is characterised by, the detection support includes intermediate plate and tightening knob；Intermediate plate is the same polythene strip with holes of two panels, and aperture is more than
Equal to 2cm, it is placed in leather sample is open and flat in the middle of two panels polythene strip with holes, is fixed using intermediate plate when using, uses fastening rotation
Button is tightened, and forms " sandwich " structure.
3. a kind of leather species fast non-destructive detection method based on terahertz light spectral technology according to claim 2, its
It is characterised by, the single-sheet thickness of the polythene strip is 2cm.
4. a kind of leather species fast non-destructive detection method based on terahertz light spectral technology according to claim 1, its
It is characterised by that the thickness of measurable " sandwich " structure of thickness of the measurement leather sample to be measured directly subtracts two panels intermediate plate
Thickness be thickness of sample.
5. a kind of leather species fast non-destructive detection method based on terahertz light spectral technology according to claim 1, its
It is characterised by, described S3, S4 specific survey calculation method are, by the detection support of blank sample and equipped with testing sample detection
Support is sequentially placed into transmission-type terahertz time-domain spectroscopy device, the detection support of blank sample is obtained respectively and equipped with treating test sample
The terahertz time-domain spectroscopy signal of support is surveyed in product examine；Using the former signal as reference signal, the latter is used as sample signal；
Testing sample refractive index n (f) calculation formula are as follows：
Wherein,Respectively sample spectra energy Is and reference spectra energy Iref is obtained after carrying out Fourier transformation
The terahertz time-domain spectroscopy signal of the phase information obtained, sample signal and reference signal can obtain sample after carrying out Fourier transformation
Spectral energy Is and reference spectra energy Iref；C represents the light velocity, and d represents the thickness of sample that Terahertz is penetrated, and f represents Terahertz
Frequency；
The calculation formula of absorption coefficient (f) is as follows：
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Wherein ρ (f) is the amplitude ratio of Is and Iref Fourier transformations, and d represents the thickness that Terahertz penetrates sample, and n (f) is refraction
Rate.
6. a kind of leather species fast non-destructive detection method based on terahertz light spectral technology according to claim 1, its
It is characterised by, the leather Terahertz characteristic spectrum database obtains variety classes by collecting measurement Known Species leather sample
The Terahertz characteristic spectrum of leather sample, forms the leather Terahertz characteristic spectrum database of large sample；Survey calculation method is same
The S1 of claim 1 to S4 is walked, and improves leather sample light by constantly obtaining the terahertz light spectrum signature of testing sample
Modal data storehouse.
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| CN109211843A (en) * | 2018-10-19 | 2019-01-15 | 北京环境特性研究所 | A kind of THz wave reflectometric systems incidence angle determines method and device |
| CN110108648A (en) * | 2019-04-30 | 2019-08-09 | 深圳市太赫兹科技创新研究院有限公司 | A kind of discrimination method and identification system of dried orange peel |
| CN111122494A (en) * | 2019-12-28 | 2020-05-08 | 深圳市太赫兹***设备有限公司 | Method and system for identifying leather varieties |
| CN111751315A (en) * | 2020-05-26 | 2020-10-09 | 中国石油天然气集团有限公司 | Method for identifying composition of plastic pipe material |
| CN113624713A (en) * | 2021-08-16 | 2021-11-09 | 云南电网有限责任公司电力科学研究院 | Method and device for detecting filthy components on surface of post insulator |
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| CN110108648A (en) * | 2019-04-30 | 2019-08-09 | 深圳市太赫兹科技创新研究院有限公司 | A kind of discrimination method and identification system of dried orange peel |
| CN111122494A (en) * | 2019-12-28 | 2020-05-08 | 深圳市太赫兹***设备有限公司 | Method and system for identifying leather varieties |
| CN111751315A (en) * | 2020-05-26 | 2020-10-09 | 中国石油天然气集团有限公司 | Method for identifying composition of plastic pipe material |
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