Medium-stepped grating type spatial heterodyne raman spectrometer optical path structure

Abstract

The invention relates to the field of raman spectrometer, in particular to a medium-stepped grating type spatial heterodyne raman spectrometer optical path structure. Two middle-step gratings (or onemiddle-step grating and one plane reflector) are adopted, and a spatial heterodyne interference effect is generated to realize spatial heterodyne raman spectrum measurement, so that the problems of low measuring efficiency, low resolution and small visual field broadening angle due to the fact that a moving part is generally arranged in a traditional fourier transform raman spectrometer are solved. The use level N of the middle-step grating is larger than 1. Under the condition that the range of the total measuring wave band of the raman spectrum of an optical path remains unchanged, the morethe use level N of the middle-step grating is, the higher the raman spectrum resolution of the optical path structure is. The back scattering raman spectrum of a sample can be measured, and the transmission raman spectrum of the sample can also be measured.

Description

technical field [0001] The invention relates to the field of Raman spectrometers, in particular to an optical path structure of an echelle grating type spatial heterodyne Raman spectrometer. Background technique [0002] Every chemical bond in a molecule has a characteristic vibrational energy, and Raman spectroscopy uses the inelastic scattering of molecular bonds to measure. Each Raman peak corresponds to a molecular bond, so Raman spectroscopy is called "molecular fingerprint" spectroscopy. Through Raman spectroscopy measurement, chemical bonds, proteins, lipids and other biomolecules present in biological samples can be detected. , low-level viruses and bacteria, different types and species of pathogenic bacteria, and even a single cell and so on. Raman spectroscopy can not only obtain the identification, composition, structure and conformation of biological samples, but also analyze the damage of macromolecules and the interaction between macromolecules. [0003] The ...

AI Technical Summary

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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