Stability evaluation method of multi-channel spectrum system and pretreatment optimization method

Abstract

The invention discloses a stability evaluation method of a multi-channel spectrum system and a pretreatment optimization method. The stability evaluation method is characterized in that stability evaluation indexes are obtained by calculating the dynamic absorbance matrix and the dynamic deviation spectrum of a sample. The pretreatment optimization method comprises the following steps: establishing a pretreatment method database; calculating stability evaluation indexes of original spectrums and correction spectrums corresponding to various pretreatment methods; respectively establishing PLS-based location and prediction models for the original spectrums and the correction spectrums; calculating to obtain errors and correlation between near-infrared predicted values and measured values; finally, determining an optimal pretreatment method for follow-up detection of a near-infrared spectrograph according to the stability evaluation indexes, the errors and the correlation. According to the invention, the integral stability of a system is objectively evaluated, the optimal pretreatment method is selected for follow-up detection of the near-infrared spectrograph, so that detected signals are more accurate, and the method has very important values to development of a low-cost near-infrared instrument and large-scale application of the near-infrared technique.

Description

technical field [0001] The invention relates to the research field of multi-channel near-infrared spectroscopy, in particular to a stability evaluation method and a pretreatment optimization method of a multi-channel spectral system. Background technique [0002] Near-infrared is an electromagnetic wave between visible and mid-infrared. With the development of chemometrics and computer technology, modern near-infrared spectroscopy has been widely used in agriculture, food, environment, biomedicine and other fields due to its advantages of simplicity, rapidity and ease of on-line analysis. The technology of full-band general-purpose near-infrared instruments is relatively mature, but the instruments are bulky and expensive, and are mainly suitable for laboratory testing, which is not convenient for the large-scale application of near-infrared spectroscopy. [0003] Traditional general-purpose near-infrared instruments are usually based on a single light source, and use grati...

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Problems solved by technology

In order to reduce the cost of near-infrared instruments and realize the large-scale application of near-infrared technology, multi-channel spectrometers with multiple light sources and multiple discrete wavelengths (such as semiconductor laser-type near-infrared instruments) are an important research and development direction for low-cost near-infrared instruments. However, for a multi-light sou

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