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Correction method of measuring point free temperature compensation model during process of online application of near infrared spectrum analyzer

一种红外光谱分析、近红外光谱的技术，应用在光谱测定法/分光光度测定法/单色器、通过光学手段进行材料分析、分析材料等方向，达到佳适应性、好通用性的效果

Active Publication Date: 2016-02-03
JIANGSU CHUHONG BIG DATA TECH CO LTD
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Problems solved by technology

These methods can overcome the interference caused by temperature changes on online measurement, but there is no general rule to judge which method to use under which circumstances, but should be selected according to specific problems

Method used

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  • Correction method of measuring point free temperature compensation model during process of online application of near infrared spectrum analyzer
  • Correction method of measuring point free temperature compensation model during process of online application of near infrared spectrum analyzer
  • Correction method of measuring point free temperature compensation model during process of online application of near infrared spectrum analyzer

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Embodiment Construction

[0041] The following takes the viscosity measurement of a polymer compound as an example to illustrate the specific implementation method. This example does not constitute a limitation on the scope of the method of the present invention.

[0042] The block diagram of the whole implementation steps is as follows: Figure 12 shown.

[0043] Step 1: Collect a representative sample, and ensure that the physical parameters of the sample to be measured can cover the range required for the measurement. The total number of samples is 40-60.

[0044] Step 2: Take advantage of figure 1 The laboratory equipment shown collects near-infrared spectra of each sample at five different temperature levels of 24°C, 35°C, 50°C, 60°C, and 70°C, and records experimental conditions such as temperature at the same time. The collected raw spectra can be found in figure 2 .

[0045] Step 3: Perform temperature-targeted preprocessing and principal component analysis (PCA) on the collected spectra...

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Abstract

The invention relates to a correction method of a measuring point free temperature compensation model during the process of online application of a near infrared spectrum analyzer. The correction method comprises the following steps: collecting the near infrared spectrums of each sample at different temperatures, carrying out pretreatment and principal component analysis on the collected spectrums aiming at temperature and physical properties of the samples, merging the obtained spectrums to generate new spectrum data, using the new spectrum data to establish a model through partial least squares so as to obtain the measured value at that moment, and finally constructing an online recursive algorithm to complete the near infrared online measurement with a measuring point free temperature compensation function. According to the method, temperature is taken as a separated hidden factor variable and participates in the process of near infrared modeling; thus when near infrared measurement is carried out, physical property measurement at different temperatures can be performed due to the temperature adaptability of the model, and the direct temperature measurement information and related calculated are not needed, so the established model has good versatility. The adopted online recursive algorithm can well adapt to the changes of sample temperature and other conditions during the process of measurement.

Description

technical field [0001] The invention relates to a method for correcting a temperature compensation model without measuring points when a near-infrared spectrum analyzer is applied online. It is suitable for online real-time detection of physical parameters affected by ambient temperature, such as fluid viscosity, material density, component concentration, food quality, agricultural product components, drug active ingredient content, gasoline and oil quality, etc. Background technique [0002] Near-infrared spectroscopy is a modern analytical technique that combines spectroscopy, chemometrics and computer applications. It has no radiation, no pollution, no destructiveness, and can simultaneously measure multiple components. It has been successfully applied to agriculture, food, Petrochemical, textile, pharmaceutical and other industries. At the same time, on the one hand, in order to provide more comprehensive and real-time sample information for the production and quality i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/359
CPCG01N21/359G01N21/8507G01N2201/1211G01N2201/129G01J3/0275G01J3/0286
Inventor 栾小丽赵忠盖刘飞
Owner JIANGSU CHUHONG BIG DATA TECH CO LTD
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