用150 W氘灯标定200~300 nm光谱辐照度

采用150 W大功率氘灯标定光谱仪器的紫外波段光谱辐照度响应度,解决了大多数光谱辐射计由于在紫外波段响应度低、信噪比小导致的定标困难。在此基础上以氘灯加球面反射镜构建了平行光光谱辐照度定标单元,满足了某些遥感类光谱辐射计辐照度响应度定标要求,该单元通过照度标准传递的方式获得标准光谱辐照度值,避开了球面反射镜光谱反射率的测量难点。与美国NIST 的FEL标准灯标定同一台光谱辐射计,其结果最大偏差为3％,200~300 nm定标误差为4.7％。

Calibration of 200~300 nm spectral irradiance using 150 W deuterium lamp

A calibrating method for the irradiance responsivity of 200~300 nm spectral instruments using 150 W deuterium was introduced in detail. This method overcame the troubles caused by the weak ultraviolet response of most spectral radiometer and poor signal-to-noise ratio. A spectral irradiance calibration unit based on parallel light was established to meet the calibration conditions of some remote sensing spectral radiometers. The calibration unit got the standard value of spectral irradiance by irradiance transfer, which avoided the difficulty of spectral reflectance measurement of the concave mirror. Using the unit and a FEL lamp from NIST to calibrate the same ultraviolet radiometer, the results show that the bias between them is 3%, and the error of spectral irradiance calibration is 4.7% in range 200~300 nm.