Multi-axial differential absorption spectrometer calibration system and method

Abstract

The invention discloses a multi-axial differential absorption spectrometer calibration system and a method. The system comprises a telescope, wherein back scattering light received by the rear end of the telescope is input into a spectrograph through an optical fiber. The system is characterized in that: the middle part of a telescope tube is provided with a front hole and a rear hole; a telescopic standard lamp component and a standard gas calibration tank component are arranged in the front hole and the rear hole respectively; the standard lamp component comprises a first substrate; a mercury lamp and a tungsten halogen lamp are arranged in the two through holes on the first substrate respectively; the standard gas calibration tank component comprises a second substrate; and a sulfur dioxide standard gas absorption tank and a nitrogen dioxide standard gas absorption tank are arranged in the two through holes on the second substrate respectively. By adopting the system, the two problems existing in the conventional multi-axial differential absorption spectrum system are solved; spectrum calibration, detector bad pixel detection and standard gas calibration are provided for the system; and the measurement accuracy for an instrument is improved.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, in particular to a multi-axis differential absorption spectrometer calibration system and method. Background technique [0002] The structure of the multi-axis differential absorption spectrometer system in the prior art is as follows: figure 1 As shown, the system consists of prisms, telescopes, visors and their driving devices, motors and temperature control circuit boards, optical fibers, spectrometers and control computers. The prism guides the scattered light into the receiving telescope, and the receiving telescope converges the scattered light into the optical fiber. The driving motor drives the prism to rotate and guides the scattered light at different angles into the receiving telescope. Measurement. After the scattered light entering the telescope is dispersed, collected and digitized, it is transmitted to the computer through the USB cable for storage and calculation, and fin...

AI Technical Summary

Problems solved by technology

The system lacks a spectral calibration device and cannot detect the spectral drift caused by changes in the temperature of the spectrometer (the spectrometer’s spectral drift will be caused by a change in the temperature of the spectrometer by 1 degree); it lacks a continuous light source such as a halogen tungsten lamp and cannot detect whether the detector pixel is good or bad

The drift of the spectrum and the damage of the detector pixel will bring errors to the final calculation results.

The system lacks a standard gas calibration device, and cannot realize the calibration of the measurement results in real time

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