Raman spectrometer with variable wavelength excitation and adjustable spectrum range and calibration splicing method

Abstract

The invention provides a Raman spectrometer with variable wavelength excitation and an adjustable spectrum range. The Raman spectrometer comprises a laser device, wherein the Raman light generated byactivating a sample through laser beams emitted by the laser device is scattered to an entrance slit; the Raman light is sequentially reflected through a first plane reflector and a first concave reflector and then converted into parallel beams to enter the surface of a plane blazed grating; the plane blazed grating is fixed on a rotating platform, and thus the plane blazed grating can be rotatedthrough the rotating platform; the reflected light split by the plane blazed grating sequentially passes through a second concave reflector and a second plane reflector and is then focused on the surface of a detector; the detector is connected with a signal processing system; and the signal processing system is also connected with a display. The Raman spectrometer has the advantages that becausethe angle of the plane blazed grating is adjustable, multiple laser devices with different wavelengths can be selected as excitation light sources; and for a certain laser wavelength, Raman spectrum measurement in a wider range can be realized by adjusting the angle of the plane blazed grating.

Description

technical field [0001] The invention relates to a Raman spectrometer, in particular to a Raman spectrometer with variable wavelength excitation and adjustable spectral range and a calibration splicing method. Background technique [0002] Raman spectrometers are increasingly used in chemical, biological, agricultural, food, geological and mining fields. According to actual applications, common excitation light sources generally use single-frequency solid-state or semiconductor lasers. Excitation wavelengths include 266nm, 355nm, 405nm, 450nm, 466nm, 485nm, 532nm, 785nm, 1064nm, etc. At present, most Raman spectrometers can only use a single-frequency laser as the excitation source. In order to ensure high spectral resolution, the wavenumber measurement range is generally limited to 2500cm -1 -4000cm -1 . Since there are often different optimal excitation wavelengths for different samples, multiple Raman spectrometers are often required to be used together in order to dete...

AI Technical Summary

Problems solved by technology

Since there are often different optimal excitation wavelengths for different samples, multiple Raman spectrometers are often used together to achieve the detection of different samples, which increases the detection cost and operational complexity.

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