一种高亮度积分球定标光源的热设计

Thermal Design for a Kind of High-Light-Level Integrating Sphere Calibration Source

针对目前光学口径不断增大的空间光学遥感器对实验室辐射定标的要求,设计了一种使用近距离小面源照明方式定标的高亮度积分球光源,并对该光源的光学参数和结构参数进行了详细设计。为了解决高亮度积分球使用时的散热问题,采用水冷的散热方式,设计了专门的散热管路。对该光源循环水流速0.1 m/s下利用有限元分析法热仿真分析,仿真结果表明,溴钨灯光源附近温度维持在125°C左右,积分球出光口温度维持在80°C左右。实验结果表明,溴钨灯光源附近温度维持在125°C左右,积分球出光口温度维持在100°C左右。通过对比分析了积分球出光口温度差异的原因,验证了仿真分析与理论计算的正确性。同时测试了该光源在400~900 nm波段范围内光谱辐亮度为6714 W/（m2·sr）。

In order to meet laboratory radiometric calibration requirements for increasing optical aperture of optical remote sensors, a kind of high- light- level integrating sphere calibration source is designed based on near small source method. Meanwhile the optical and structural parameters of the high-light-level integrating sphere calibration source are designed in detail. To solve the problem of heat dissipation of high-light-level integrating sphere calibration source, circulating cooling water is used as cooling means, and special cooling pipes are designed. The high- light- level integrating sphere calibration source is analyzed by finite element analysis method of thermal simulation in the state of 0.1 m/s of the circulating water. From the analysis results,the temperature around the tungsten bromine lamp is about 125 ℃, the outlet temperature of the high-lightlevel integrating sphere calibration source is about 80 ℃. From the experimental results, the temperature around the tungsten bromine lamp is about 125 ℃, the outlet temperature of the high-light-level integrating sphere calibration source is about 100 ℃. Through the comparative outlet temperature difference of the highlight- level integrating sphere calibration source, the causes are explained, and the validate of simulation analysis and theoretical calculations are verified. Meanwhile it can be suggested in the measurement data that the integrated spectral radiance of the high-light-level integrating sphere calibration source is 6714 W/（m2﹒sr）in the range of 400 nm to 900 nm.