Mixed gas temperature/concentration field measuring method and device based on acousto-optic fusion

Abstract

The invention belongs to the technical field of acousto-optic detection, and in particular relates to a mixed gas temperature/concentration field measuring method and device based on acousto-optic fusion. The mixed gas temperature/concentration field measuring method comprises the following steps: according to a plurality of acoustic waves obtained through measurement and calculation, the acoustic speed of a laser path with fixed wave length during measurement area penetration, and a spectrum integral absorption rate, and with the combination of an index SVD inverse algorithm, confirming the acoustic speed and the spectral absorption coefficient distribution inside a gas two-dimensional area; by virtue of the function relationship between the acoustic speed and the spectral absorption coefficient and the temperature and the concentration of mixed gases, simultaneously reconstructing a temperature field and a concentration field of the mixed gases in the measurement area. According to the mixed gas temperature/concentration field measuring device, two acoustic wave frequencies with narrow bandwidth are adopted to measure the phase difference of transmitting-receiving signals, accurate measurement on the acoustic wave transmission time is achieved, and a fixed spectral integral absorption rate can be obtained according to the ratio of the laser intensity received by a detector and the intensity of incident laser of a collimator. The method and the device can be applied to multiple fields of industrial production and living, and particularly monitoring and control on the combustion process inside a furnace.

Description

technical field [0001] The invention belongs to the technical field of acousto-optic detection, in particular to a method and device for measuring the temperature field concentration field of a mixed gas based on acousto-optic fusion. Background technique [0002] With the rapid development of industrialization, gas temperature and component concentration have become indispensable monitoring objects in the fields of chemical industry toxic gas detection, bioengineering, and combustion diagnosis. Especially for the combustion process in large-scale thermal power boilers and industrial furnaces, since the temperature and concentration are always coupled to reflect the parameters of the combustion process, it will be of great significance to control the operating conditions if the temperature field and concentration field can be accurately measured at the same time. [0003] In terms of temperature measurement by the acoustic method, as early as 1873, Mayler first proposed and ...

AI Technical Summary

Problems solved by technology

Tunable absorption spectroscopy technology has high sensitivity and accuracy, but the tunable equipment itself is expensive, which is not conducive to application promotion, and due to the complexity of the functional relationship, the algorithm can only choose genetic simulation for the simultaneous reconstruction of the temperature field concentration field For iterative algorithms such as annealing, the real-time performance of reconstruction cannot be guaranteed

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