Study On Multispectral Temperature Measurement Technology In Laser Damage

In order to evaluate the damage effectiveness of laser weapon,it is necessary to study the temperature variation of the damage area.In general,during the process of damaging the target area by laser weapon for about a few seconds,severe temperature changes occur in the damaged area.The study of the temperature change and the damage effectiveness in the damage area can be analyzed,but also analyze the damage effectiveness of the object.The design of laser weapon system can be required,and the study of radiation spectrum can be used to analyze the properties of target materials and distinguish the types of materials.In order to study the precise temperature change of the target region in laser damage,the effect of the spectral transmittance on the measurement spectrum under different temperature and atmospheric environment should be considered.The superposition of different temperature spectra will cause the inversion temperature to be lower than the real temperature,and the error of temperature inversion will be increased when the measured spectra obtained by atmospheric transmission at a certain distance.By reducing the influence of other factors on temperature inversion and improving the accuracy of temperature inversion in the target region,the accurate temperature distribution of the target region can be obtained by feedback,thus providing a powerful support for the evaluation of the effectiveness of laser damage targets.It provides an idea for the measurement of regional temperature distribution.Taking the damaged area with regular temperature distribution as an example,the multi-spectral temperature measurement technique under long and short distance was analyzed,and the effects of low temperature region and atmospheric transmission on spectral measurement were simulated.In this paper,an improved method of multi-spectral precise temperature measurement was proposed,which greatly reduces the temperature measurement error of multi-spectral temperature measurement technology.The main work of this paper was as follows:(1)The principle of multi-spectral temperature measurement,the scope of application,and the factors that influence the precision of temperature measurement were analyzed in detail.The influence of influence factors on spectral measurement in the range of 0.4~0.9 μm was simulated,and the advantage of using this band for temperature inversion was demonstrated.(2)The spectral smoothing,interpolation and filtering methods used in temperature inversion were described in detail,and an improved multi-spectral temperature measurement technique was proposed.The radiation spectra of different temperatures in the target region were superimposed,and the superposition spectra of the target region were retrieved by using the multi-spectral temperature measurement technique.The accuracy of the temperature measurement was compared with the colorimetric method and the unimproved multi-spectral method under the same conditions.(3)The influence of the radiation spectrum on the radiation spectrum after the transmission of the radiation spectrum through the atmosphere can be analyzed.ModTran software was used to simulate the atmospheric transmittance after a certain distance transmission in different environments.Then the effect of atmospheric transmittance on radiation spectrum was simulated to reduce the effect of atmospheric transmission on the accuracy of temperature inversion.(4)The laser damage experiment was carried out.The damage effect of the material was observed and analyzed with steel plate and carbon fiber as the damage material.The feasibility of multi-spectral temperature measurement in laser damage process was proved from the experimental point of view.