应用于CARSNET的太阳辐射计辐射定标的LED参考光源

LED Reference Light Source for Sun Radiometer Sky Diffuse Channels Radiance Calibration Applied to CARSNET

依据我国气溶胶光学特性监测网(CARSNET)辐射定标方法和流程,分析了太阳辐射计实验室辐射定标技术需求与特点。为完善目前CARSNET所采用辐射定标方法中太阳辐射计天空散射辐射通道短波段定标和提高太阳辐射计气溶胶反演精度,研制了应用于太阳辐射计的LED光谱可调积分球参考光源。测试结果表明该参考光源在出光口中心20 mm区域内的面均匀性优于99.9%,±2°小角度范围内角度均匀性优于99.9%,其输出2 h内的稳定性优于99.8%,满足太阳辐射计天空散射辐射通道短波段定标要求。

According to sun radiometer radiance calibration method and process applied to China aerosol robot sun photometer network （CARSNET） work, the characteristics and technical requirement of sun radiometer radiance calibration in lab are analyzed. To fill up the blank sun radiometer sky diffuse channels radiance calibration of short wavelength, and to improve retrieved aerosol accuracy, the LED reference light source for sun radiometer sky diffuse channels radiance calibration is designed. The test results show that the planar uniformity of the source is better than 99.9~ at the 20 mm exit normal circular area, the angular uniformity is better than 99.9% within ±2° to the exit normal, and the stability of source is better than 99.8% within 2 h.The LED reference light source satisfies the requirements of sun radiometer short wavelength diffuse channels radiance calibration.