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Method for identifying textile fibers based on Raman spectra qualitative identification

A technology of textile fibers and Raman spectroscopy, applied in the field of textile materials, can solve the problems of cumbersome operation, long detection period, troublesome sample preparation, etc., and achieve the effects of accurate test results, small sample volume, and short test time.

Inactive Publication Date: 2008-05-28
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Among the inspection methods commonly used in laboratories at present, methods such as microscope observation and burning have certain limitations in judging fabrics, and can only qualitatively identify natural fibers or synthetic fibers; for most fabrics, especially blended fabrics of synthetic fibers, Can only be judged by chemical dissolution method
When using the chemical dissolution method for analysis, it is often necessary to use highly toxic organic solvents, such as phenol, dimethylformamide, etc., which are not only harmful to the health of the experimenters, but also pollute the atmosphere, and the operation is cumbersome and time-consuming.
Therefore, it is unsatisfactory both in terms of working environment and efficiency.
Although infrared absorption spectroscopy can accurately and qualitatively identify textile fibers, it has high requirements on the temperature and humidity of the test environment, sample preparation is also very troublesome, and the detection cycle is long, which cannot meet the requirements of rapid detection.

Method used

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  • Method for identifying textile fibers based on Raman spectra qualitative identification
  • Method for identifying textile fibers based on Raman spectra qualitative identification
  • Method for identifying textile fibers based on Raman spectra qualitative identification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Taking the qualitative identification of pure cotton fiber as an example, the steps are as follows:

[0033] 1) directly obtain the laser Raman spectrum of pure cotton fiber with a Raman spectrometer, see Figure 1a);

[0034] 2) Baseline correction is performed on the Raman spectrum of pure cotton fiber to eliminate the fluorescent background. The steps are as follows:

[0035] 2.1) Using the moving window polynomial differential algorithm to calculate the first-order differential spectrum of the pure cotton fiber Raman spectrum:

[0036] (2.1.1) For each data point in the pure cotton fiber laser Raman spectrum, select 2×h+1 data points with the point as the center and a half window width of h to form a moving window;

[0037] (2.1.2) carry out polynomial fitting to the data in this window;

[0038] (2.1.3) Deriving the polynomial and calculating the first order differential value of a certain spectral point.

[0039] The result of polynomial differentiation with a m...

Embodiment 2

[0049] Taking the qualitative identification of acrylic fiber as an example, the steps are as follows:

[0050] 1) directly obtain the laser Raman spectrum of the acrylic fiber with a Raman spectrometer, see Figure 1d);

[0051] 2) Baseline correction is performed on the Raman spectrum of the acrylic fiber to eliminate the fluorescent background, and the processing steps in Example 1 are used to perform baseline correction. The selection of processing parameters is exactly the same. The half-window width of the polynomial differential of the moving window is 4 data points, and the order of the polynomial is the second order; the reference area without effective peaks is 1850-2150cm -1 The data points within; the half-window width w of the validity discrimination window is 20 data points, and the relative threshold of validity discrimination K=3.

[0052] 3) Perform maximum value normalization on the baseline-corrected Raman spectrum, and use the processing steps in Example 1...

Embodiment 3

[0054] Taking the qualitative identification of polyester fiber as an example, the steps are as follows:

[0055] 1) directly obtain the laser Raman spectrum of the polyester fiber with a Raman spectrometer, see Figure 1c);

[0056] 2) Perform baseline correction on the Raman spectrum of the polyester fiber to eliminate the fluorescent background, and use the processing steps in Example 1 to perform baseline correction. The selection of processing parameters is exactly the same. The half-window width of the polynomial differential of the moving window is 4 data points, and the order of the polynomial is the second order; the reference area without effective peaks is 1850-2150cm -1 The data points within; the half-window width w of the validity discrimination window is 20 data points, and the relative threshold of validity discrimination K=3.

[0057] 3) Perform maximum value normalization on the baseline-corrected Raman spectrum, and use the processing steps in Example 1 to ...

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Abstract

The invention discloses a method for discriminating textile fibers, which is based on Raman spectra quantitative. The invention comprises using a raman spectrometer to obtain directly a laser Raman spectrogram of testing textile material, then correcting the Raman spectrogram of the testing textile material in baseline, eliminating a fluorescent background, finally normalizing the Raman spectrogram to a maximum value after baseline correction, obtaining a characteristic peak of the testing textile material, discriminating testing textile fiber according to position and strength of the characteristic peak. The discriminating method belongs to absolute optical methods, needing samples are few, samples need no pre-treatments, testing time is short, testing result is accurate, testing process produces no damages to the sample, and chemical pollution won't be produced. The invention is applicable to fiber qualitative discriminations of various textile materials.

Description

technical field [0001] The invention belongs to the field of textile materials, and in particular relates to a method for qualitatively identifying textile fibers by using laser Raman spectroscopy. Background technique [0002] As a big textile country, my country ranks first in the world in terms of textile exports. For entry-exit inspection and quarantine bureaus in various places, textile export inspection work is arduous, and textile fiber content testing is an important item of statutory inspection. At present, in the qualitative analysis of textile content, the following textile industry standards are generally used: [0003] FZ / T 01057.1-1999 "General Instructions for Qualitative Identification of Textile Fibers"; [0004] FZ / T 01057.2-1999 "Textile Fiber Qualitative Identification Burning Test Method"; [0005] FZ / T 01057.3-1999 "Qualitative Identification of Textile Fiber Microscopic Observation Method"; [0006] FZ / T 01057.4-1999 "Qualitative Identification of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 戴连奎包鑫吴俭俭
Owner ZHEJIANG UNIV
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