Hadamard-transform near-infrared spectrograph added with light harvesting structure

Abstract

The invention discloses a Hadamard-transform near-infrared spectrograph added with a light harvesting structure, and relates to the field of Hadamard-transform near-infrared spectrographs. The spectrograph comprises a light source, the light harvesting structure consisting of a collimation lens and a cylindrical lens, a slit, a collimation lens, a plane grating, a DMD (digital micro mirror device), an imaging lens, a single-point detector, a static drive circuit and a spectral information acquisition and processing system. According to the Hadamard-transform near-infrared spectrograph, the light harvesting structure is added between an optical fiber and the slit, so that the energy utilization ratio of the system for light to be detected is improved greatly, and the detection for near-infrared spectrum is facilitated; appropriate slit width, grating incident angle and the like are selected, then the resolution ratio of the spectrograph is higher, simultaneously, the energy utilization ratio is higher, and the detection capacity of the spectrograph for a weak spectrum signal is improved; and a single-point photodiode is used to perform spectrum detection, accordingly, the spectrograph cost and the spectrograph size are reduced, and the detection sensitivity is improved.

Description

technical field [0001] The invention relates to the field of Hadamard transform near-infrared spectrometers, in particular to a Hadamard transform near-infrared spectrometer added with a light-collecting structure. Background technique [0002] As a powerful scientific analysis tool, near-infrared spectroscopy has been widely used in agricultural products, petrochemical products, clinical diagnosis, environmental testing and other fields. With the improvement of requirements for spectrometers in research and application fields, non-contact, fast, low-cost, stable and reliable micro-miniature spectrometers have gradually become the development trend in this field. At present, there are mainly two types of digital transform miniature near-infrared spectrometers: Fourier transform and Hadamard transform. Due to the existence of movable parts, the Fourier transform spectrometer has high environmental requirements and is mainly used for laboratory analysis. The Hadamard Transfo...

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Problems solved by technology

[0003] In order to solve the technical problems existing in the prior art that high energy utilization rate and high resolution cannot be guaranteed at the same time, weak near-infrared spectral signals cannot be detected, and the spectrometer is large in size and high in cost, the present invention provides a light-collecting structure Hadamard transform near-infrared spectrometer, which makes the DMD-based Hadamard transform near-infrared spectrometer realize the perfect combination of high resolution, small volume, low cost and high light energy utilization

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