System and method for analyzing complicated component gas in multiple gas chambers

Abstract

The invention discloses a system and a method for analyzing complicated component gas in multiple gas chambers, and belongs to the field of gas analysis. The system comprises a circuit module, an optical module and a gas channel module, wherein the gas channel module comprises a sample gas chamber for packaging gas to be detected which is formed by mixing a plurality of components and a plurality of standard gas chambers for respectively packaging single component gas in each gas chamber according to the composition components of the gas to be detected. Because beam-splitting lasers entering all the gas chambers are originated from the same light source, the drifting of the wavelength has a consistency property, and the influences on a signal to be detected and a reference signal are synchronous; in addition, the structures of the multiple gas chambers are positioned at the same environment temperature, and relative changing degrees of spectral curves of the gas to be detected and reference gas are consistent. To sum up, even if the wavelength of the laser is drifted or an environment temperature is changed, the influences of unstable factors are still evaluated by the reference signal in real time, so that precise inversion on the concentration of the gas to be detected is realized.

Description

technical field [0001] The invention relates to the field of gas analysis, in particular to a multi-chamber complex component gas analysis system and method based on tunable semiconductor laser absorption spectroscopy technology. Background technique [0002] Tunable Diode Laser Absorption Spectroscopy (TDLAS, Tunable Diode Laser Absorption Spectroscopy) is a technology widely used in trace gas concentration detection, and is widely used in petrochemical, environmental detection, biomedicine, aerospace and other fields. Existing TDLAS systems often have only one analytical gas chamber, using lasers with narrow linewidth and relatively high side-mode suppression as the light source to analyze the spectral curve of a single gas. When the spectral signals of gases overlap with each other, it is often necessary to use a chemometric correlation algorithm to separate the characteristic spectral information of each gas. However, since the nature of the gas itself is affected by te...

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Problems solved by technology

However, since the nature of the gas itself is affected by temperature and pressure, the broadening and height of the absorption spectrum of different gases are different at different temperatures, and the degree of spectral overlap is also different. At this time, it is often impossible to distinguish the effects of temperature changes and changes in gas concentration itself Therefore, it is generally necessary to carry out constant temperature heat tracing treatment on the gas chamber, plus algorithms such as absorption line positioning and temperature correction to reduce the influence of unstable factors

[0003] The laser used in the TDLAS system is generally expensive due to its high performance requirements, and the addition of a constant temperature device will greatly increase the volume of the equipment. In addition, when faced with the measurement of complex gas components, due to the different spectral correction coefficients of different gases, it is necessary to A large amount of calibration data is accumulated, and the accuracy of the measured concentration cannot be fully guaranteed in the long run

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