Gas concentration measurement device and method based on ultraviolet light modulation

Abstract

The invention discloses a gas concentration measurement device based on ultraviolet light modulation. The gas concentration measurement device comprises a signal transmission module, a gas measurement module, a signal receiving module and a signal processing module in sequence, wherein the signal transmission module comprises an ultraviolet deuterium lamp light source and an optical wave chopper, which are connected through an ultraviolet quartz optical fiber; the gas measurement module comprises a heat tracing pipe tape, a gas tank and a heating module wrapping the gas tank; the signal receiving module is composed of a spectrograph which takes a CCD (Charge Coupled Device) array as a detection core; gas to be detected is pre-heated by the heat tracing pipe tape and then enters the gas tank; the heating module is used for keeping the gas tank at a pre-set temperature; light emitted by the ultraviolet deuterium lamp light source is modulated by the optical wave chopper and then is transmitted to an incidence opening of the gas tank through the ultraviolet quartz optical fiber; after the gas to be detected is absorbed, a signal is received by the spectrograph and is transmitted to the signal processing module for processing. The invention further discloses a gas concentration measurement method based on the ultraviolet light modulation; a signal-to-noise ratio of measurement signals can be extremely increased, and the gas concentration measurement method is very suitable for monitoring low-concentration gas.

Description

technical field [0001] The invention relates to a gas concentration measuring device based on optics and spectroscopy technology, in particular to a gas concentration measuring device and method based on ultraviolet light modulation, belonging to the field of optical measurement technology. Background technique [0002] In recent years, with the country's increasing emphasis on environmental protection and the need to ensure safe and efficient industrial production, accurate monitoring of the concentration of pollutant gas components is of great significance for controlling air pollution gas emissions. [0003] The methods currently used in the measurement of pollutant gas concentration are mainly divided into non-optical and optical analysis methods according to their working principles. Non-optical analysis methods mainly include ultrasonic technology, gas sensing method, thermal catalytic method, gas chromatography, light interference method, etc., but because they are ea...

AI Technical Summary

Problems solved by technology

For the spectrometer, the noise mainly comes from the CCD device, including the output noise of the floating amplifier, transfer noise, dark current noise, and the noise of the charge injection device during the integration period. The effective signal amplitude is small, and the interference of noise on the measurement results is very obvious, which seriously limits the lower limit of its measured gas concentration

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