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Method for identifying bamboo hemp fiber by using terahertz time-domain spectroscopy technique

A technology of terahertz time-domain and spectral technology, which is applied in the field of identification of bamboo fiber and hemp fiber by using terahertz time-domain spectral technology, can solve the problems of difficult identification and similar spectral features, and achieve simple sample preparation and improved reliability. Reliability, the effect of increasing feature information

Inactive Publication Date: 2013-09-18
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it comes to fibers with similar components, the invention also faces the problem of similar spectral features and difficult identification

Method used

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  • Method for identifying bamboo hemp fiber by using terahertz time-domain spectroscopy technique
  • Method for identifying bamboo hemp fiber by using terahertz time-domain spectroscopy technique
  • Method for identifying bamboo hemp fiber by using terahertz time-domain spectroscopy technique

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Experimental program
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Effect test

preparation example Construction

[0030] (1) Preparation of fiber samples

[0031] Put the bamboo fiber, ramie fiber and hemp fiber samples used as standard samples into a 5 g / L neutral soap solution for 10 min, then ultrasonically clean them in deionized water for 5 min, and then put them in an oven at 105 °C Dry for 1 h. After each fiber is made into powder, it is mixed with polyethylene powder at a ratio of 1:1 and molded to make a disc sheet with a diameter of 13 mm and a thickness of 0.96-1.02 mm;

[0032] (2) Use the transmission-type terahertz time-domain spectroscopy test device to test, and obtain the time-domain waveform of the terahertz pulse through each standard sample;

[0033] (3) Perform Fourier transform on the time-domain waveform of the terahertz pulse of each standard sample to obtain the frequency-domain spectrum, and use the current general model for extracting material terahertz optical constants (Timothy D. Dorney, Richard G. Baraniuk. J . Opt. Soc. Am. A, 2001, 18(7):1562-1571), calc...

Embodiment 1

[0036]At first, adopt method described in the present invention, obtain the absorption spectrum of bamboo fiber in terahertz band ( figure 2 ) and the refractive index spectrum ( Figure 5 ). figure 2 It can be seen that the bamboo fiber has obvious characteristic absorption peaks in the measured frequency range, and the absorption intensity above 2.0 THz is obviously enhanced. Figure 5 It shows that the refractive index of bamboo fiber in the test range is concentrated between 1.425-1.430, and the average refractive index is 1.428.

[0037] Bamboo fibers are then identified qualitatively:

[0038] (1) Bamboo fiber pretreatment: Weigh 2g of bamboo fiber, put it into 5g / L neutral soap solution for ultrasonic cleaning for 10min, then take out the bamboo fiber, put it into deionized water for ultrasonic cleaning for 5min, put it into the oven after cleaning Perform drying (105°C, 1 h);

[0039] (2) Tablet preparation: Slice and crush the bamboo fiber obtained in step 1), a...

Embodiment 2

[0043] First, adopt the method described in the present invention to obtain the absorption spectrum ( image 3 ) and the refractive index spectrum ( Figure 6 ). image 3 It can be seen that the ramie fiber has obvious characteristic absorption peaks in the measured frequency range, and the number, position and relative intensity of the absorption peaks are significantly different from those of the bamboo fiber. Figure 6 It shows that the refractive index of ramie fiber in the test range is concentrated between 1.415-1.435, and the average refractive index is 1.423.

[0044] Taking the qualitative identification of ramie fiber as an example, the steps are as follows:

[0045] (1) Pretreatment of ramie fiber: Weigh 2g of ramie fiber, put it into 5g / L neutral soap solution for ultrasonic cleaning for 10min, then take out the ramie fiber, put it into deionized water for ultrasonic cleaning for 5min, put it into Oven drying (105°C, 1 h);

[0046] (2) Tablet preparation: Slice...

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Abstract

The invention relates to the field of textile materials, and aims at providing a method for identifying a bamboo hemp fiber by using a terahertz time-domain spectroscopy technique. The method comprises the following steps of: respectively mixing and pressing a fiber with polyethylene powder to prepare a disc sheet after preparing the powder from the fiber as a guide sample; testing by adopting a transmission-type terahertz time-domain spectroscopy test device, thus respectively obtaining terahertz pulse time-domain waveforms through each guide sample; calculating the absorption coefficient and the refractive index of each guide sample, so as to respectively draw out an absorption spectrum and a refraction spectrum of the fiber; obtaining an absorption coefficient and a refractive index of the fiber to be identified; and confirming the type of the fiber to be identified according to the corresponding relation with the absorption spectrum and the refraction spectrum of each guide sample. According to the method, required sample quantity is simple, samples are simple and convenient to prepare, test time is short, and chemical pollutants are not caused in a test process; the absorption spectrum and the refraction spectrum of the sample at a terahertz waveband can be obtained at the same time when the sample is tested; the feature information of the samples is increased; the reliability of a test result is also improved.

Description

technical field [0001] The invention belongs to the field of textile materials, and in particular relates to a method for identifying bamboo fibers and hemp fibers by using terahertz time domain spectroscopy technology. Background technique [0002] Bamboo fiber is a natural, virgin cellulose fiber extracted directly from bamboo, which maintains its original structure and physical and chemical properties. Its preparation process generally needs to go through whole material, making bamboo slices, soaking, cooking, splitting, carding, etc., to remove impurities such as lignin, sugar, bamboo powder, pectin in bamboo. Bamboo fiber is a new type of textile fiber raw material. The special highly hollow structure makes bamboo fiber have strong air permeability. At the same time, bamboo fiber also has excellent colorability, resilience and abrasion resistance, as well as natural antibacterial, antibacterial, deodorant and anti-ultraviolet properties. The application of this kind o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35
Inventor 杨斌颜超
Owner ZHEJIANG SCI-TECH UNIV
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