Near infrared spectrum testing method based on multivariate optical calculation

Abstract

The invention discloses a near-infrared spectrum test method based on multivariate optical calculation. The method comprises the following steps of step 1, obtaining a near-infrared spectrum of a sample for modeling to obtain a coefficient vector, mapping the coefficient vector to a chip unit of a near-infrared spectrometer so as to set an on-off state of a micromirror of the near-infrared spectrometer to form a measurement mode, and forming an optical filter; and step 2, establishing a measurement mode corresponding to one optical filter, measuring a to-be-measured sample by utilizing the mode, obtaining optical modulation of the information of the to-be-measured sample through the optical filter, and directly obtaining an analysis result, and realizing qualitative and quantitative analysis of the sample. The method relates to a novel method for realizing and measuring an optical filter, which can flexibly and selectively control an MEMS chip to realize the filter; the filter is usedas a mode to measure a sample so as to realize multivariate optical calculation, qualitative and quantitative analysis of different samples can be rapidly realized, and the method has the advantages of high speed, high feasibility, easiness in practicability, no need of data post-processing and the like.

Description

technical field [0001] The invention belongs to the technical field of near-infrared spectrum analysis, and relates to a near-infrared spectrum test method based on multivariate optical calculation. Background technique [0002] For traditional spectrometers, the detector obtains spectral information data, which must be processed through cumbersome data processing (the entire processing process is also called post-processing, that is, the modeling sample is first subjected to spectral measurement, and the calibration model is obtained after modeling; and the prediction sample is also first Spectral measurement is performed, after obtaining the spectral data, the spectral data is processed through the calibration model, and finally the result of the predicted sample can be obtained) to obtain the predicted result. Multivariate optical computing (MOC) is a method that uses optical filters to achieve optical calculations in the optical measurement process. The spectrometer bas...

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Problems solved by technology

[0004] In the current research, the near-infrared spectrometer based on MEMS chip (liquid crystal chip, DMD chip, etc.) Sequential calibration, and then using the chip to gate and modulate the wavelength, does not realize the principle of multivariate optical calculation

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