Optical spectrum detecting method and spectrometer based on space light modulator

Abstract

The invention relates to a spectrometer based on a programmable spatial light modulator array, which comprises a light source, a collimating lens, the programmable spatial light modulator array, an imaging device and a single detector. Light emitted by the light source passes through the collimating lens and is parallel incident to the programmable spatial light modulator array; the programmable spatial light modulator array is modulated by applying driving voltage; the single detector is arranged on a focal plane of the imaging device; the single detector orderly obtains light intensities of various wave lengths according to time sequence; and various wave lengths are subjected to spectrum detection by the information processing technology. The programmable spatial light modulator array of the instrument is a grating light modulator array based on an MEMS technology, the photoelectric detection part is only the single detector, and the spectrometer has the advantages of low price, small volume, quick response, convenient carrying and use, and so on.

Description

technical field [0001] The present invention relates to spectral detection technology, in particular, the present invention relates to a spectrometer based on a spatial light modulator, which can be widely used in the fields of spectral analysis, food safety monitoring, environmental monitoring, water quality monitoring, air pollution monitoring and the like. Background technique [0002] Spectral analysis instruments are an important part of optical instruments. It is a basic equipment for measuring, analyzing and processing the structure and composition of substances by applying optical principles. It is widely used in chemical analysis, agricultural production, environmental monitoring, clinical testing, industrial testing, aerospace remote sensing and other fields. Existing spectrometers mainly include filter type, raster scanning type, Fourier type, acousto-optic tuning, etc., but each has its own advantages and disadvantages. [0003] Optical filter type: simple struc...

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Problems solved by technology

[0012] (1) Except for filter-type spectrometers, they can only be used in small-sample fixed-point spot checks or laboratory use, and the cost is expensive; and the filter-type detection objects are too single, resulting in the current situation of weak food safety monitoring in my country

[0013] (2) Foreign technologies are monopolized by patents, which is not conducive to domestic promotion and application

[0014] (3) As the key device in the spectral analysis instrument - the diffraction grating / modulator, the MEMS process of such devices used in the above spectral analysis instrument is relatively complicated

[0015] (4) The linear array detector of near-infrared spectrum is expensive, which is not conducive to the low cost of the whole monitoring system, and it is difficult to increase the penetration rate of spectroscopic instruments

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