Spatial heterodyne Raman spectrometer optical path structure

Abstract

The invention provides a spatial heterodyne Raman spectrometer optical path structure. The spatial heterodyne Raman spectrometer optical path structure comprises a collimating lens, a Raman optical filter, a short-wave pass filter, an interferometer assembly, an imaging lens group, and plane-array detector; the interferometer assembly comprises a beam splitter mirror, two prisms, and two optical gratings; the prisms are symmetrically arranged on two arms of the interferometer assembly; the optical gratings are symmetrically arranged on two arms of the interferometer assembly with a certain angle; each optical grating is composed of n sub-optical gratings, and n is equal to or larger than 2; the n sub-optical gratings can be arranged in different groove spacing. Compared with structures with only one sub-optical grating (n=1), the spatial heterodyne Raman spectrometer optical path structure possesses a following advantage: n times Raman spectrum measuring wave band rang is achieved. Thespatial heterodyne Raman spectrometer optical path structure contains no moving part, so that problems in conventional Fourier transform Raman spectrometers that measuring efficiency is low, and spectrum resolution ratio is low are solved, Raman spectrum high resolution ratio measuring in different wave bands can be realized, and excellent view field broadening capability is achieved.

Description

technical field [0001] The invention relates to the field of grating spectrometers, in particular to an optical path structure of a spatial heterodyne Raman spectrometer. Background technique [0002] The Raman spectrometer can identify various molecular structures and substance types by measuring the Raman spectrum of the measured object. It has the advantages of wide detection range, real-time performance and non-invasiveness. [0003] The Fourier transform Raman spectrometer uses a Michelson interferometer to generate an interference spectrum to obtain a Raman spectrum. The optical path of the Michelson interferometer is mainly composed of a beam splitter and two plane mirrors, one of which is stationary and the other is constantly moving back and forth, thus forming an interference optical path difference. Because there are generally moving parts in the optical path, the measurement of the full-spectrum Raman spectrum cannot be completed at the same time, and because th...

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Problems solved by technology

Because there are generally moving parts in the optical path, the measurement of the full-spectrum Raman spectrum cannot be completed at the same time, and because the core optical path adopts a Michelson interferometer structure, the measurement efficiency of the Fourier transform Raman spectrometer is low. The structure is not compact, the field of view of the instrument is limited, etc.

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