A method for estimating the concentration of multiple components based on the absorption spectrum of a single component
A technology of absorption spectroscopy and laser absorption spectroscopy, which is applied in the field of single-component laser absorption spectroscopy to estimate the concentration of multiple components, can solve the problems of high cost, difficulty in changing parameters flexibly, and long cycle, so as to reduce the number of absorption lines, Avoid the effects of missing information
Active Publication Date: 2021-09-28
BEIHANG UNIV
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Problems solved by technology
The former adopts the method of directly or indirectly measuring combustion parameters, so that the research of some combustion processes can be intuitive and clear, but the cost is high, the cycle is long, the parameters are difficult to change flexibly, the turbulence characteristic parameters and combustion parameters are difficult to measure directly, and the measurement results are not suitable for extrapolation, etc. , which limits its practical application
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[0033] See attached figure 1 , a flowchart for multi-component concentration estimation based on numerical simulation and neural network-based small-scale laser absorption spectroscopy. Combined image 3 The schematic diagram of the mesh division of the area to be tested for the flat flame burner and the attached Figure 4 The algorithm is illustrated based on the numerical simulation and the error of concentration estimation of various components in a small number of laser absorption spectra by neural network.
[0034] Step 1. Numerical simulation of combustion: use computational fluid dynamics software to numerically simulate the methane-air premixed combustion flame of the flat flame burner: firstly, establish a two-dimensional geometric model for the The measurement area is divided into 80×80 grids, the methane-air mixed gas inlet is set as a circle with a radius of 30mm, the nitrogen accompanying flow is a ring with an inner diameter of 30mm and an outer diameter of 33....
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The present invention provides a method for estimating the concentration of multiple components based on the absorption spectrum of a single component. It includes the following steps: the method is based on the numerical simulation results of combustion, combined with the neural network algorithm, to obtain a network model from the absorption spectrum information of a single component on the laser path to the average concentration of other components on the path, so that according to the combustion process The laser absorption spectrum information of a single component estimates the average concentration of the remaining components to be measured along the path. The effect of the present invention is that in the case of limited absorption information, a small amount of absorption spectrum information of a single component is used to estimate the concentration of the remaining components, reducing the absorption lines required for simultaneous measurement of the concentration of multiple components in laser absorption spectroscopy number, reducing the amount of data and calculations during measurement, so that the concentration of other components in the combustion field can be estimated based on the absorption information of easily measurable components, and the problem of information loss caused by the difficulty in obtaining absorption spectrum information for some components can be avoided. with broadly application foreground.
Description
technical field [0001] The invention relates to the technical field of laser spectroscopy, and relates to a method for estimating the concentrations of multiple components in a single component laser absorption spectrum based on numerical simulation and neural networks. Background technique [0002] Laser absorption spectroscopy is a combustion field parameter measurement technology developed in the 1970s. It has the advantages of non-invasiveness, fast measurement speed and high sensitivity. Especially with the development of laser processing technology, narrow-bandwidth, monochromatic, high-power lasers are available, which can realize accurate scanning of absorption spectrum lines, and the measurement accuracy of laser absorption spectrum has been effectively improved. It has been widely used in Aerospace engine detection, automobile engine diagnosis, coal-fired boiler combustion diagnosis, microgravity combustion diagnosis, trace gas detection, environmental protection a...
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IPC IPC(8): G01N21/39G01N31/12
CPCG01N21/39G01N31/12
Inventor 徐立军曹章杨亚如黄昂陆方皞
Owner BEIHANG UNIV
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