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Near-infrared physical property parameter measuring method without measuring point temperature compensation

A technology of physical parameter and temperature compensation, applied in measuring devices, material analysis through optical means, instruments, etc., can solve problems such as spectral interference, affecting the robustness of model accuracy, affecting measurement accuracy, etc., and achieve the best robustness Effect

Active Publication Date: 2016-04-13
JIANGNAN UNIV
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Problems solved by technology

Therefore, in the detection of near-infrared spectroscopy, an important reason affecting the measurement accuracy is the interference brought by temperature changes to the spectrum, which makes the models established at different temperatures not universal, which in turn affects the accuracy and robustness of the models.

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  • Near-infrared physical property parameter measuring method without measuring point temperature compensation
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  • Near-infrared physical property parameter measuring method without measuring point temperature compensation

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Embodiment Construction

[0043]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.

[0044] The implementation flow chart of the non-measuring point temperature compensation method for near-infrared measurement is shown in Figure 11 , including the following steps:

[0045] 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.

[0046] Step Two: Use 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.

[0047] Step 3: Perform preprocessing and principal component analysis on the collected near-infrare...

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Abstract

The invention discloses a near-infrared physical property parameter measuring method without measuring point temperature compensation. The method comprises the following steps: acquiring representative samples, acquiring the near-infrared spectra of all the samples at different temperatures and recording experimental conditions like temperature at the same time; then preprocessing the acquired spectra, establishing a near-infrared prediction model for sample temperatures and separately establishing near-infrared physical property parameter prediction models for low-temperature points and high-temperature points; and carrying out correction computation on different temperatures from the low-temperature points or high-temperature points and constructing a physical property parameter correction model applicable to any temperature. The method provided by the invention takes temperature as an explicit factor variable in construction of a temperature correction model, so physical property measurement at different temperatures can be accomplished in virtue of response of the spectra to temperatures during near-infrared measurement; thus, direct temperature measurement information and related calculation are not needed.

Description

technical field [0001] The invention relates to a method for modeling and predicting physical parameters of samples by using a near-infrared spectrum analyzer with the function of temperature compensation without measuring points. Rapid detection of drug quality, gasoline and oil products, etc. This method can also be used for the measurement of human non-invasive blood sugar concentration, soil composition and mineral composition. Background technique [0002] Near-infrared spectral analysis is a modern analysis technology that combines spectral measurement technology, chemometric technology, and computer technology in the near-infrared spectral region. It has been widely used in chemical, food, petroleum, pharmaceutical, agricultural and other fields. In particular, near-infrared spectroscopy has the advantages of fast analysis speed, less damage to samples, no chemical pollution, simultaneous analysis of multiple components, and simple sample preparation, making it more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/359
CPCG01N21/359G01N2201/129
Inventor 栾小丽赵忠盖刘飞
Owner JIANGNAN UNIV
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