Method and device for measuring gas temperature and heat diffusion rate based on laser-induced grating
A technology of grating measurement and thermal diffusivity, which can be used in measuring devices, measuring heat, thermometers, etc., and can solve problems such as temperature detector errors
Pending Publication Date: 2018-12-28
ZHEJIANG UNIV
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Similarly, this method also has the error problem and hysteresis problem of the temperature detector itself
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Embodiment 1
[0107] Such as figure 1 As shown, the device for measuring gas temperature and thermal diffusivity based on laser-induced grating includes three parts: excitation light unit, detection light unit, and signal receiving unit.
[0108] (1) The excitation light unit is composed of a pulse laser 1, a cube beam splitter 2, a first mirror 3, a second mirror 4, and a light trap 5, and is used to generate an induced grating in the measurement area; the laser wavelength of the pulse laser is 532nm , the pulse time is 8ns, the pulse energy is 200mJ, the beam splitting ratio of the cube beam splitter is 50%:50%, the first reflector 3 and the second reflector 4 are symmetrically arranged, so that the two beams of excitation light after reflection are at the measuring point O The optical path difference at the point position is zero.
[0109] (2) The detection light unit is composed of a continuous laser 10 and a light trap 5, and is used to generate signal light in the induced grating are...
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Abstract
The invention discloses a method for measuring gas temperature and heat diffusion rate based on a laser-induced grating. According to the method, a pulse laser is adopted for excitation and inductionof grating, and continuous laser is used as detection light to generate signal light, and the grating distance is determined, and the frequency value of the signal light oscillation is extracted, andthen the temperature value is obtained through calculation; by performing fitting on the signal attenuation curve, a time constant is obtained and the heat diffusion rate is worked out. The inventionfurther discloses a device for measuring the gas temperature and the heat diffusion rate based on the laser-induced grating, wherein the device comprises an excitation light unit, a detection light unit and a signal receiving unit. According to the method and the device for measuring the gas temperature and the heat diffusion rate based on the laser-induced grating, the high precision and transient state measurement on the temperature and the heat diffusion rate in the combustion field and the gas environment is achieved, the defects existing in the existing temperature measurement means are overcome, the characteristics of strong anti-interference capability, complex environment adaptability and the like are achieved, and the heat diffusion rate of the gas component can be synchronously obtained.
Description
technical field [0001] The invention belongs to the field of gas temperature and thermal diffusivity measurement, in particular to a method and device for measuring gas temperature and thermal diffusivity based on laser-induced gratings. Background technique [0002] In energy, environment, chemical industry, smelting, aerospace and other industries, real-time and accurate measurement of gas temperature and thermal diffusivity is of great significance for production process optimization, energy saving and emission reduction, and safe production. Traditional temperature measurement methods include contact and non-contact methods. [0003] Thermocouple temperature measurement is a typical contact measurement method, which has been widely used; however, the arrangement of thermocouples interferes with the flow field of the measured environment, and the measurement accuracy is also poor; at the same time, in special high-temperature environments , thermocouples often need to be...
Claims
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IPC IPC(8): G01K11/32G01N25/20G01K11/3206
CPCG01K11/32G01N25/20
Inventor 吴迎春吴学成陈玲红邱坤赞高翔岑可法林志明
Owner ZHEJIANG UNIV