A concave grating spectrometer

Abstract

The invention discloses a concave grating spectrometer which comprises an entrance slit, a concave grating, a light shielding board, a reflecting mirror and a photodetector. The photodetector directly receives light waves of short-wave bands in spectrums, light waves of long-wave bands in the spectrums are reflected to the photodetector through the reflecting mirror, and thus the photodetector is multiplexed by the light waves of the short-wave bands and the light waves of the long-wave bands. Furthermore, the position of the photodetector and the position of the reflecting mirror meet the condition that the light waves of the short-wave bands and the light waves of the long-wave bands entering the photodetector do not interfere with each other in the detection process. The light shielding board is movably arranged on a light path between the concave grating and the photodetector, when the light waves of the short-wave bands need to be detected, the light shielding board is switched to a first position, so that the light waves of the short-wave bands enter the photodetector, and the light waves of the long-wave bands are prevented from entering the photodetector. When the light waves of the long-wave bands need to be detected, the light shielding board is switched into a second position, so that the light waves of the long-wave bands enter the photodetector, and the light waves of the short-wave bands are prevented from entering the photodetector. The concave grating spectrometer can greatly improve the spectral resolution under the premise that the original volume is basically unchanged.

Description

Technical field [0001] The invention relates to the field of grating production, in particular to a concave grating spectrometer. Background technique [0002] With the continuous improvement of the performance of the spectrometer and the continuous improvement of its functions, the volume of the instrument has become more and more bulky. Although it can meet the needs of indoor high-precision scientific analysis, its outdoor application has been greatly restricted. Shortcomings such as not timely, inaccurate, or even impossible. In recent years, due to the modern development of some application fields that require on-site real-time testing, such as environmental testing, biomedicine, scientific and technological agriculture, military analysis, and industrial process monitoring, the large-scale spectroscopic instruments in the laboratory have been unable to meet the above practical requirements. The development of portable small spectrometer products has important practical sign...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to propose a concave grating spectrometer capable of improving the spectral resolution while keeping the volume constant, so as to solve the problem that the volume of the existing small spectrometer increases with the increase of the resolution

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