量热式激光能量计内外表面温差对测量结果的影响

Influence of Temperature Difference Between Inner and Outer Surface of Calorimetric Laser Energy Meter on Measurement Result

从理论上研究了量热式激光能量计激光照射过程中和激光照射后内外表面温度时间关系.编制了计算机程序计算得到激光照射时间内以及激光停止照射后内外表面温度关系曲线.通过稳定的高温温度场加热试验件模拟激光照射量热式激光能量计内外表面温度的升温过程,通过迅速将试验件移离高温温度场模拟激光停止照射后量热式能量计内外表面温度的变化,并测量了量热式能量内外表面温度时间曲线.实验和理论研究结果相符,结果表明激光停止照射后,内外表面温度迅速趋近,由此引入的测量不确定度小于0.25%.

The temperature-time relation between inner and outer surface of calorimeter laser energy meter during laser irradiation and after laser irradiation was theoretically studied, and corresponding curve for the relation is calculated through software programming. By heating prototype tester in stable hightemperature temperature field, the temperature rising process for inner and outer surface of calorimeter laser energy meter is simulated and the temperature change process after stopping laser irradiation is also simulated through swiftly moving the tester out of the high-temperature temperature field. The temperature-time curve for inner and outer surface of calorimeter laser energy meter is measured. The experimental results agree well with the theoretical studies, which show that the temperatures between inner and outer surface of calorimetric laser energy meter tend to become the same quickly and the uncertainty due to that is less than 0.25%.