定量水直接吸收法测量激光能量可行性分析

Feasibility Analysis of Laser Energy Meter Using Fixed Mass Water Absorption

针对近红外强激光能量高精度测量需求,提出了定量水直接吸收法,采用定质量的水作为吸收体,通过激光辐照前后水温的变化获得激光能量。为验证该方法的可行性,建立了类比电路模型,分析了入射激光能量和隔热层热阻对温差的影响规律。研究结果表明:入射激光总能量与温度变化之间存在显著的线性关系;采用温度曲线下降沿拟合的数据处理方法能降低隔热热阻对测量结果的影响。因此,定量水直接吸收激光能量测量方法有望实现近红外高能激光能量的高精度测量。

In this paper,a new technology termed as laser energy meter using fixed mass water absorption is proposed.This laser energy meter uses fixed mass water isolated from environment as absorption media,and the total injection laser energy is obtained through the changes of water temperature before and after laser irradiation.The feasibility of quantitative water direct absorption method is theoretically simulated and analyzed.The results show that there is a significant linear relationship between the total incident laser energy and the temperature variation.The data processing method of fitting the falling edge of temperature curve can reduce the influence of thermal insulation resistance on the measurement results.Thus,the proposed laser energy meter is expected to realize high precision measurement of near infrared high energy laser.