Quick nondestructive detection method for leather types based on terahertz spectrum technology

A non-destructive testing and spectroscopic technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of damage to samples and high cost

Inactive Publication Date: 2017-09-29
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing qualitative analysis and authenticity identification of leather and its products mainly adopt the sensory identification method, that is, completely adopt the method of seeing and touching for identification. This method requires the identification personnel to have rich ident

Method used

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  • Quick nondestructive detection method for leather types based on terahertz spectrum technology
  • Quick nondestructive detection method for leather types based on terahertz spectrum technology
  • Quick nondestructive detection method for leather types based on terahertz spectrum technology

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Examples of identification and testing of different species of leather such as pigs, cattle, and sheep.

[0034] 1. Prepare a detection bracket suitable for terahertz spectroscopy detection of leather samples: such as figure 2 As shown, the detection bracket includes a clip 1 and a fastening knob 2; the clip 1 is two identical perforated polyethylene sheets with a hole diameter greater than or equal to 2 cm, and the leather sample is placed flat on the two perforated polyethylene The middle of the piece is fixed by clip 1 and tightened by fastening knob 2 to form a "sandwich" structure. Measuring the thickness of pig, sheep, cow, rabbit, mink, dog, and badger leather samples are 2mm; 1.5mm; 2mm; 1.5mm; 1.6mm; 1.6mm; 2mm; The thickness of the sample is obtained by subtracting the thickness of the two clips. In order to ensure the transmission efficiency of the terahertz wave and minimize the generation of echoes, the thickness of the single polyethylene sheet can be s...

Embodiment 2

[0045] Examples of different age animal leathers such as fetal calfskin, calfskin, and cowhide for identification and testing.

[0046] This example provides a method for detecting animal leather samples of different ages using terahertz time-domain spectroscopy. The operation steps are exactly the same as in Example 1, except that the samples to be tested are leather from cattle of different ages. Tested samples: Use two perforated polyethylene sheets to sandwich the leather sample to form a "sandwich" test sample, and measure the thickness of the fetal cowhide, calfskin, and cowhide samples to be 0.5mm; 1mm; 1.8mm:

[0047] 2. Sample detection and signal processing: The terahertz time-domain spectroscopy device is also used to adopt the transmitted light path, and the empty sample holder is used as a reference to detect the leather samples and repeat the measurement three times for each sample. The calculation formula used is the same as in Example 1. The results of the thr...

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Abstract

The invention provides a quick nondestructive detection method for leather types based on a terahertz spectrum technology. The method comprises the following steps: S1, preparing a detection bracket suitable for detecting a leather sample by terahertz spectrum; S2, measuring the thickness of a to-be-detected leather sample; S3, measuring a blank sample detection bracket to acquire a reference terahertz time-domain spectral signal and measuring and acquiring a sample terahertz time-domain spectral signal of the detection bracket with the to-be-detected sample; S4, measuring different sites of a same sample for many times, calculating the characteristic parameters, taking the mean value to reduce error, and acquiring the mean value of the terahertz spectral characteristic parameters of the to-be-detected sample; and S5, comparing leather terahertz characteristic databases constructed to determine the types of leather. The method is quick, label-free, free of damage, simple to operate and widely suitable, can overcome subjective effect of an identifier, and can objectively reflect the types of detected leather and leather products.

Description

technical field [0001] The invention belongs to the technical field of leather type detection, and in particular relates to a fast and nondestructive detection method for leather types based on terahertz spectrum technology. Background technique [0002] The existing qualitative analysis and authenticity identification of leather and its products mainly adopt the sensory identification method, that is, completely adopt the method of seeing and touching for identification. This method requires the identification personnel to have rich identification technology and experience, and will inevitably be subject to Discriminator subjective influence. In addition, there are detection methods for labeling DNA or other characteristic biomacromolecules by detecting samples, but they are expensive and also have the possibility of damaging samples. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background ...

Claims

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Application Information

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IPC IPC(8): G01N21/3586
CPCG01N21/3586
Inventor 颜识涵汤明杰魏东山
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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