A system and method for two-dimensional temperature and concentration reconstruction based on histogram information
A histogram and concentration technology, applied to physical/chemical changes in thermometers, thermometers, image enhancement, etc., can solve problems such as long processing time and large amount of calculation for solving nonlinear problems
Active Publication Date: 2020-07-31
BEIHANG UNIV
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The reconstruction result of this method is smoother and more accurate, but the solution of nonlinear problems is computationally intensive and takes longer to process
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[0051] Below in conjunction with example the present invention will be further described.
[0052] In this example, a pentagonal sensor is used, and 12 photoelectric detection plates are uniformly arranged on each side of the sensor. Select the central wavenumber as 7185.56cm -1 H 2 O absorption spectrum, for a given temperature and concentration distribution in the simulation, theoretically calculate the projected absorption rate along all light to simulate the experimental measurement results. Then use the established linear model to reconstruct the two-dimensional temperature and concentration distribution, the reconstruction process is as follows figure 1 shown, including the following steps:
[0053] Step 1. Calculate theoretically the projection absorptivity of the reconstructed object along all light rays under the current sensor settings. The pentagonal sensor structure used in this example is as follows figure 2 As shown in the middle pentagon structure, the lig...
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The invention provides a two-dimensional temperature and concentration reconstruction system and method based on histogram information, belongs to the technical field of tunable diode laser absorptionspectra and is used for two-dimensional temperature and concentration reconstruction. The reconstruction system comprises a laser control and generation module, an optical fiber beam splitter, a sensor for light beam conversion, detection and reception, a Mach-Zehnder interferometer and a photoelectric detector for wave number conversion, a data acquisition system, a computer and the like. The reconstruction method comprises steps that after laser with scanned wavelength is split, one path is accessed to the Mach-Zehnder interferometer to receive by the photoelectric detector, and the other paths are expanded and then pass through a to-be-detected area to receive by a photoelectric detection plate to obtain absorption spectrums on all light rays; a reconstruction matrix is calculated according to a temperature and concentration reconstruction range and light path arrangement; a reconstruction model is solved by utilizing an iterative algorithm to obtain two-dimensional temperature andconcentration distribution. The method is advantaged in that the absorption spectrum information can be effectively utilized, the number of independent equations is increased, and the speed and accuracy of two-dimensional temperature and concentration distribution reconstruction are improved.
Description
technical field [0001] The invention proposes a two-dimensional temperature and concentration reconstruction system and method based on histogram information, belonging to the technical field of tunable diode laser absorption spectroscopy. This method is used for the simultaneous reconstruction of the temperature distribution and the concentration distribution of a two-dimensional combustion field. Background technique [0002] Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology is widely used in the measurement of combustion field temperature and typical molecular concentration due to its advantages of non-invasive, high speed and accuracy. TDLAS technology is based on line-of-sight measurement. The light emitted by the laser passes through the gas to be measured and is received by the photodetector. Using two lasers with different wavelengths, the temperature and concentration of the measured gas can be obtained by colorimetry. In 1978, Ronald K. Hanson et al....
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IPC IPC(8): G01N21/39G01K11/00G06T5/40
CPCG01K11/00G01N21/39G06T5/40
Inventor 曹章邱爽徐立军侯广羽
Owner BEIHANG UNIV