Method for simultaneous measurement of high-temperature gas two-dimensional transient temperature field and concentration field

Abstract

The invention discloses a method combining hyper-spectrum and wavelength modulation for simultaneous measurement of high-temperature gas two-dimensional transient temperature field and concentration field. The method includes: arranging a laser array in a to-be-measured high-temperature area, and conducting hyperspectral scanning on the to-be-measured area to obtain water vapor absorption spectral line information, and carrying out demodulation with a digital phase lock technology to obtain each harmonic signal, then conducting background deduction first harmonic normalization processing, extracting the maximum amplitude value of the signal to measure regional temperature field and water vapor concentration field, and during measuring, conducting grid discretization treatment on the to-be-measured area, arranging laser beam at each row and each column of the grid to conduct broad spectrum scanning on the characteristic spectral line of the to-be-measured gas under a wavelength modulation mode, and using intelligent optimization algorithm to realize inversion of the temperature field and gas concentration field. The measurement method provided by the invention combines hyper-spectrum and wavelength modulation spectroscopy technologies, and is especially suitable for monitoring of high-temperature gas two-dimensional temperature field and concentration field on harsh industrial sites.

Description

technical field [0001] The invention relates to a method for simultaneously measuring two-dimensional transient temperature field and concentration field of high-temperature gas by combining hyperspectral and wavelength modulation, and belongs to the field of laser absorption spectroscopy. Background technique [0002] In scientific research and engineering applications, the temperature and concentration parameters of gases in certain specific areas are important physical parameters for studying the working process and performance parameters of certain equipment, measuring and controlling the state and behavior of substances, and improving energy utilization. Realizing real-time and effective monitoring of gas temperature field and concentration field is of great significance to ensure the normal operation, environmental protection, energy saving and safety of the system. [0003] At present, gas temperature measurement technology is mainly divided into two categories: conta...

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Problems solved by technology

The method of measuring the two-dimensional transient temperature field and concentration field of high-temperature gas by traditional hyperspectral technology based on the direct absorption method uses the relative error between the calculated value of the integral absorption rate and the measured value as the objective function for iterative optimization calculation, which is only applicable to In the case of large gas concentration, high absorption rate, low on-site interference, and baseline fitting, however, in many industrial applications with harsh environments, such as particulate matter in fluidized beds, coal particles and fly ash in gasifiers Gray, light scattering will occur, resulting in large non-absorptive loss and time-varying, and at the same time, it is difficult to fit the baseline due to spectral line interference

The above factors make it difficult to apply the traditional hyperspectral technology based on the direct absorption method.

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