Calibration method and device for wavenumber resolution of Raman spectrometer

Abstract

The present invention provides a Raman spectrometer wave number resolution calibration method and device. The method comprises the steps of acquiring a detection spectrum of a high-purity neon lamp via a to-be-calibrated Raman spectrometer; based on the detection spectrum, calculating the wave number resolution of the to-be-calibrated Raman spectrometer at a preset wavelength, and on a standard spectrum of the high-purity neon lamp, determining a first peak wavelength of a spectral line nearest to the preset wavelength at the left side of the preset wavelength and a second peak wavelength of aspectral line nearest to the preset wavelength at the right side of the preset wavelength, and calculating the wave number separation distance between the first peak wavelength and the second peak wavelength; according to the difference value between the wave number resolution at the preset wavelength and the wave number separation distance, calibrating the wave number resolution of the to-be-calibrated Raman spectrometer at the preset wavelength. By adopting the standard spectrum generated by the high-purity neon lamp to calibrate the wave number resolution of the to-be-calibrated Raman spectrometer, the multipoint calibration of the wave number resolution at different preset wavelengths can be realized simultaneously.

Description

technical field [0001] The invention relates to the technical field of optical measurement, and more specifically, to a method and device for calibrating the wavenumber resolution of a Raman spectrometer. Background technique [0002] Raman spectroscopy is a kind of molecular vibration spectrum, which can reflect the fingerprint characteristics of molecules and can be used for the detection of substances. The Raman spectrometer detects and identifies substances by detecting the Raman spectrum generated by the Raman scattering effect of the analyte on the excitation light. [0003] For Raman spectrometers, the unit of resolution is cm -1 , which is the wavenumber resolution. The spectral curves of the tested samples measured by Raman spectrometers with different wavenumber resolutions are also different, which will lead to inaccurate parameters of the tested samples obtained. Therefore, the wavenumber resolution of the Raman spectrometer is an important technical index for...

AI Technical Summary

Problems solved by technology

However, since the resolution of the Raman spectrometer is a wavenumber resolution, the spectral curve is not linearly continuous in the wavenumber space

If the full width at half maximum of the spectral curve measured by the Raman spectrometer is still used as the index of its wavenumber resolution, the obtained wavenumber resolution will be different from the actual result, and the size of the difference will change with the wavenumber, so that the calibrated inaccurate result

Images