Device and method for measuring gas temperature and concentration simultaneously through single spectral line

Abstract

The invention discloses a device for measuring gas temperature and concentration simultaneously through a single spectral line, and also discloses a method for measuring gas temperature and concentration simultaneously through the single spectral line. The method comprises the steps: firstly employing a peak normalization second harmonic signal line style which is only determined by temperature, and extracting the temperature of gas; extracting the concentration information through employing the directly proportional relation of the amplitude of the first-harmonic normalization second harmonic signal with concentration (background is removed), and obtaining the temperature and concentration of gas at the same time. The method can measure the temperature and concentration of gas at the same time, reduces the number of needed spectral lines, is high in sensitivity, is high in precision, and is quick in response. Compared with a conventional Doppler broadening temperature measurement method, the method can be used under the conditions of normal temperature and pressure. In addition, the method, compared with a conventional double-line temperature measurement method, does not need to consider the problems of frequency crosstalk and time resolution.

Description

technical field [0001] The invention relates to a device for simultaneously measuring gas temperature and concentration by using a single spectral line, and also relates to a method for simultaneously measuring gas temperature and concentration by using a single spectral line, belonging to the technical field of laser absorption spectroscopy. Background technique [0002] Temperature is one of the most common and important parameters in daily life and production process. At present, my country's power supply is still dominated by coal-fired power plants. Real-time monitoring of the gas temperature in the boiler furnace during the combustion process can optimize combustion control, improve combustion efficiency and economic benefits, and reduce pollutant emissions. [0003] In the field of aviation, the aeroengine is the core component of the aircraft, and its working condition plays a vital role in the safe flight of the aircraft. However, the temperature and concentration o...

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Problems solved by technology

The absorption intensity of the two absorption lines in the measured temperature range should not be too small. For the absorption line with low energy level and higher level, the absorption intensity is often very low, which limits the selection of absorption line with higher energy level. ; In addition, the absorption line with lower energy level has a stronger absorption on the cold boundary layer, which limits the selection of absorption line with lower energy level; When used, the two spectral lines need to select an appropriate modulation frequency to avoid crosstalk between frequencies, which also limits the selection of modulation frequencies by the two-line method, and the time-division multiplexing method will reduce the time resolution

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