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...

AI Technical Summary

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 source spectroscopy system, the correlation between the dynamic deviation spectra of absorbance at each wavelength is low, and the signal-to-noise ratio of each wavelength is difficult to evaluate the overall stability of the system, and it is difficult to improve the overall performance of the instrument only by increasing the signal-to-noise ratio of each wavelength channel. predictive performance

Images