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Method for nondestructively detecting viscosity of nitro-cotton

A non-destructive testing and nitrocellulose technology, which is applied in the direction of measuring devices, flow characteristics, instruments, etc., can solve the problems of long time-consuming viscosity of nitrocellulose, inability to adapt to industrial field real-time detection, low efficiency, etc., and achieve fast measurement speed and low measurement cost , the effect of simple operation

Inactive Publication Date: 2011-02-09
FOCUSED PHOTONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] 3. It takes a long time and low efficiency to measure the viscosity of nitrocellulose by using the method of preparing solution, which cannot adapt to the real-time detection on the industrial site

Method used

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  • Method for nondestructively detecting viscosity of nitro-cotton
  • Method for nondestructively detecting viscosity of nitro-cotton
  • Method for nondestructively detecting viscosity of nitro-cotton

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0046] see figure 1 , a method for non-destructive testing of nitrocellulose viscosity, comprising the following steps:

[0047] a. Select the nitrocellulose sample set and collect the sample spectrum. The specific steps are as follows:

[0048] a1. According to the range of viscosity values, select representative nitrocellulose samples with viscosity to form sample sets A, B, and C corresponding to the measurement types, where the measurement types are method A, method B, and method C; A Set includes 270 samples whose viscosity is measured by method A, and the viscosity value of the sample is distributed in a gradient; set B includes 50 samples whose viscosity is measured by method B, and the viscosity value of the sample is distributed in a gradient; set C includes 60 samples passed by C Method to measure the viscosity of the sample, and the viscosity value of the sample is a gradient distribution; the viscosity range of nitrocellulose is between 0.6~2000s, and the viscosit...

Embodiment 2

[0069] A method for non-destructive detection of nitrocellulose viscosity is different from the method for detecting the viscosity of nitrocellulose described in Example 1:

[0070] In step a, optimize the spectral library formed by all sample spectra: match the spectra in the spectral library, and calculate the Mahalanobis distance between the spectra; select similar spectra with good matching according to the Mahalanobis distance between the spectra, Keep one of the similar spectra and delete the rest to update the spectral library;

[0071] Preprocess the spectra in A, B, C and the updated spectral library.

[0072] The advantage of optimizing the spectral library is that redundant information can be removed and representative spectra can be selected, so that when an unknown sample spectrum is input, a matching spectrum can be quickly found.

Embodiment 3

[0074] A method for non-destructive detection of nitrocellulose viscosity is different from the method for detecting the viscosity of nitrocellulose described in Example 2:

[0075] In step a, the spectra eliminated during the spectral library optimization are simultaneously eliminated in the corresponding A spectrum set or B spectrum set or C spectrum set, and the A spectrum set and / or B spectrum set and / or C spectrum set are updated to select the spectrum with Representative spectra to save model building time;

[0076] In step b, corresponding prediction models A model, B model and C model are established according to the updated and preprocessed A spectrum set, B spectrum set and C spectrum set.

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Abstract

The invention relates to a method for nondestructively detecting the viscosity of nitro-cotton. The method comprises the following steps of: a, selecting a nitro-cotton sample with viscosity representativeness so as to form a sample set and acquiring the spectrum of the sample in the sample set, wherein the viscosity range is between 0.6 and 2,000 s and the spectrum scanning range is between 800 and 2,500 nanometers; b, establishing a prediction model according to the spectrum and viscosity value of the sample; c, acquiring the spectrum of an unknown nitro-cotton sample so as to obtain the spectrum of the unknown sample; and d, inputting the spectrum of the unknown sample into the prediction model for analysis and computation so as to obtain the viscosity value of the unknown nitro-cotton sample. The invention has the advantages that: the method is easy to operate, has high measuring speed and is environmentally-friendly.

Description

technical field [0001] The invention relates to a method for detecting the viscosity of nitrocellulose, in particular to a method for nondestructively detecting the viscosity of nitrocellulose by using spectral analysis technology. Background technique [0002] Nitrocellulose, also known as nitrocellulose, scientific name cellulose nitrate, is prepared by esterification of refined cotton linters and nitrating acid. [0003] Nitrocellulose is a film-forming material widely used in paints, inks, leather brighteners, nail polishes, and table tennis balls. Coatings made of nitrocellulose have both durable weather resistance, better resin compatibility and the best quick-drying properties. For wood coatings, it has unparalleled advantages. [0004] According to its nitro content and viscosity value, nitrocellulose is divided into different specifications and used in different fields, as shown in Table 1. [0005] Table 1: General technical specifications for industrial nitrocel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 杨伟伟周新奇叶华俊
Owner FOCUSED PHOTONICS