A Laser Absorption Spectroscopy Temperature Measurement Method Based on Low Bandwidth Photodetector
A technology of laser absorption spectroscopy and photodetectors, which is applied in the rapid measurement of uniform temperature field by laser absorption spectroscopy, and in the field of laser absorption spectroscopy temperature measurement, can solve the problems of high detector bandwidth requirements and complex signal processing methods, and achieve The effect of reducing calculation time, easy implementation, and saving hardware resources
Active Publication Date: 2021-11-23
BEIHANG UNIV
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Problems solved by technology
The wavelength modulation method is beneficial to reduce the disturbance caused by environmental noise, circuit noise, and standard distance effect, and has strong anti-interference ability; however, the signal processing method of this method is relatively complicated, and data calibration is required. At the same time, the detector bandwidth is relatively high. High, only suitable for occasions where the concentration of the measured object is low
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[0038] The present invention will be further described below in conjunction with specific implementation examples.
[0039] In this example, the numerical simulation is carried out for the working conditions of the actual combustion uniform temperature field and the absorption of the laser spectrum by water vapor molecules, and the commonly used center wavelengths are selected as 7185cm -1 、7444cm -1 The two tunable spectral scanning lasers are absorbed lasers, numerically simulate the uniform temperature distribution field of 300K-700K, and set five concentration values (gas mole percentage) with a step size of 0.02 from 0.01 to 0.09 at each temperature point to simulate real working conditions , the air pressure is a standard atmospheric pressure, using the HITRAN database to calculate the transmitted light intensity I after the two laser beams pass through the measured area 1H and I 2H , using the direct absorption method to measure the transmitted light intensity I 1H...
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Abstract
The invention proposes a laser absorption spectrum temperature measurement system and method based on a low-bandwidth photodetector, which belongs to the technical field of tunable diode laser absorption spectrum and is used for rapid measurement of a uniform temperature field. The method can perform arbitrary functions by using a neural network The advantages of approximation, by constructing a neural network between the measurement information of the low-bandwidth photodetector and the spectral absorption area obtained by the measurement and calculation of the high-bandwidth photodetector, after training, the temperature can be realized only by the low-bandwidth photodetector. Quick measure. This method reduces the requirements for detectors and data acquisition devices, and has low computational complexity. The calculation process is conducive to hardware implementation, and has the advantages of high real-time performance, high anti-noise ability, and low resource occupation. It has great potential in the field of temperature measurement. Good application prospects.
Description
(1) Technical field [0001] The invention proposes a laser absorption spectrum temperature measurement method based on a low-bandwidth photodetector, which belongs to the technical field of tunable diode laser absorption spectrum. The method is used for rapid measurement of a uniform temperature field by laser absorption spectroscopy. (2) Background technology [0002] Non-contact temperature measurement technology is widely used in industrial production, scientific research, national defense and military and other fields. Accurate temperature monitoring is of great significance for optimizing burner design, improving combustion efficiency, and reducing pollution emissions in the combustion process. Contact measurement technology has the advantages of high upper limit of temperature measurement and no damage to the flow field, and has wider application prospects than traditional contact measurement technology. Optical measurement methods mainly include spontaneous Raman scatt...
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IPC IPC(8): G01K11/00
CPCG01K11/00
Inventor 徐立军曹章谭雨田解恒杨亚如
Owner BEIHANG UNIV