Spatial heterodyne Raman spectrometer

Abstract

The invention provides a spatial heterodyne Raman spectrometer. The spatial heterodyne Raman spectrometer comprises a light source device, a collimating lens, a Raman optical filter group, an interference device and an imaging device, the light source device emits laser and then enters a sample, and the sample emits scattered light beams after being stimulated; the scattered light beam is collimated by the collimating lens and filtered by the Raman optical filter group, and then enters the refraction assembly to be divided into two beams; one collimated light beam is refracted by the refraction assembly and then enters the plane mirror of the plane mirror-echelle grating to be reflected, and the reflected light beam enters the refraction assembly; and the other collimated light beam is refracted by the refraction assembly and then enters the echelle grating of the plane mirror-echelle grating through the prism to be diffracted, the diffracted light beam enters the refraction assembly through the prism to interfere with the reflected light beam, and the interference light beam enters the imaging device to obtain a spatial heterodyne Raman signal. The device has the advantages of wide measurement wave band range, simple optical path adjustment, compact structure and the like.

Description

technical field [0001] The invention relates to the technical field of spectral analysis instruments, in particular to a spatial heterodyne Raman spectrometer. Background technique [0002] Raman scattering is a natural phenomenon in which light is scattered inelastically by molecular vibrations with an instantaneous dipole moment. In Raman scattering, a photon provides energy equal to the vibrational mode of the molecule, leaving a molecule in an excited state and a photon with an energy loss equal to the vibrational energy gap. Because each molecule has a unique set of vibrational modes, Raman spectroscopy can be used to unambiguously identify a wide range of compounds, including minerals, organics, and biomarkers. [0003] Harlander has developed a new type of spatial interferometer, called the spatial heterodyne spectrometer (SHS), a variant of the Michelson interferometer, capable of measuring high-resolution scattered light spectra in a compact light footprint system ...

AI Technical Summary

Problems solved by technology

However, since the diffraction grating is placed on the two interference arms of the interferometer, and the optical path has strict requirements on the position and angle of the diffraction grating, the installation and adjustment of the optical path of the interferometer has become a difficult problem

In addition, since both arms use gratings for diffraction, the range of wavelengths detected by the detector is very narrow

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