Two-way contrast measurement spectrometer and measurement method based on reference optical signal

Abstract

The invention relates to a two-way contrast measurement spectrometer and a measurement method based on a reference optical signal. A two-way sampler is connected to a two-way detection acquisition module, a processing control circuit, a light source module, and a monochromator, wherein the power supply is respectively connected with the two-way detection acquisition module, the light source module, and the monochromator, the monochromator is connected with an upper computer through the processing control circuit. Dividing the scanned monochromatic light into the measurement light and the reference light after the sample or the reference by the two-way sampler, and simultaneously obtaining the two-way optical signal measurement values by the two-way detection acquisition module, taking theratio of the two-way optical signal as the spectral scan measurement data, and calculating the reflectance or transmittance of the measured sample and the absorbance spectral data according to the spectrum instrument reference, the background and the spectral scanning measurement data of the sample. Compared with a single optical spectrometer, eliminating the effect of the light source stability on instrument stability effectively, compared with an existing two-way optical spectrometer, the structure is simple, the cost is low, and the device is especially suitable for stability of a portableinstrument.

Description

technical field [0001] The invention relates to a system and method for eliminating the influence of light source stability by a portable spectrometer, in particular to a portable near-infrared spectrometer and a spectral measurement method based on two-way detection, comparison, correction and measurement of signals based on reference light. Background technique [0002] As a commonly used analytical instrument, spectrometer has a wide range of applications. The spectroscopic instrument is composed of light source, monochromator, detector, sampler, acquisition and control, power supply and other parts. The monochromator divides the composite light emitted by the light source into monochromatic light distributed in space, enters the detector after the sampler interacts with the sample or reference, converts it into an electrical signal, and collects the digital signal after the sample or reference after amplification processing. Signal, compared with the relative reflectanc...

AI Technical Summary

Problems solved by technology

However, such an instrument needs to add multiple spectroscopic reflectors, two sets of samplers, and even two sets of acquisition circuits, and requires the two optical paths to be symmetrical, so the structure is complicated and the cost of the instrument is increased, especially not suitable for portable instruments

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