Method for simultaneously measuring distribution of high-temperature gas two-dimensional transient temperature field and concentration field based on hyper spectrum

Abstract

The invention discloses a method for simultaneously measuring distribution of a high-temperature gas two-dimensional transient temperature field and concentration field based on a hyper spectrum, and belongs to the technical field of laser absorption spectrums. The method comprises the steps that a laser array is distributed on a high temperature area to be measured, hyper spectrum scanning is carried out on the area to be measured, an area temperature field and a vapor concentration field are measured through the spectral absorption of vapor characteristic spectral lines, and meanwhile the distribution of a gas concentration field is measured through the characteristic spectrum absorption of other gas. Grid scattering is carried out on the area to be measured in measurement, laser beams are distributed on the rows and columns of a grid respectively, broadband spectrum scanning is carried out on the characteristic spectral line of gas to be measured, and the inversion of the temperature field and the gas composition concentration field is achieved through a spectrum absorption rate obtained through the scanning with the help of an intelligent optimization algorithm.

Description

technical field [0001] The invention relates to the field of infrared laser absorption spectroscopy, in particular to a method for simultaneously measuring two-dimensional transient temperature field and concentration field distribution of high-temperature gas based on hyperspectral. Background technique [0002] Temperature is an important parameter in chemical reactions and industrial processes. The measurement of the temperature field, especially the effective and accurate monitoring of the temperature and component concentration fields in the combustion process, is the key to improving combustion efficiency, controlling pollution emissions, studying combustion mechanisms, and developing A decisive condition for an efficient burner. [0003] At present, temperature measurement is mainly divided into two categories: contact and non-contact measurement methods. [0004] Contact measurement: For the measurement of combustion flame temperature, various types of thermocouples...

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Problems solved by technology

[0008] Traditional gas concentration detection technologies include manual sampling and continuous sampling. Manual sampling methods (such as chemical analysis, gas chromatography, etc.) require manual sampling and experimental analysis of gases, and can only detect and analyze single components one by one. Therefore, the Method is less efficient and highly dependent on operator analytical skills

The continuous sampling method commonly used analytical instruments such as ultraviolet light and thermal conductivity, which are composed of two parts: a sampling pretreatment system and an analytical instrument. This method requires gas sampling during the measurement process, and the response speed is slow, so it is difficult to perform real-time online monitoring of the concentration; single gas sampling Points can only get the value of a certain point in the concentration field, and multi-point sampling measurement will increase equipment investment

At the same time, the gas is prone to interference reactions during the sampling process, resulting in a deviation between the measured value and the true value

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