Research on brightness adjustable integral sphere light source technology and its application

At present, the spectral radiation response function of the radiometer is calibrated by the irradiance standard lamp and diffuse reflector whiteboard, which cannot achieve linear calibration in a large dynamic range. A high-precision integral sphere light source with adjustable brightness was proposed. The output radiance was controlled by fixed and variable apertures, and the dynamic range reached 4 orders of magnitude. In addition,the spectral response function of the barrel-type radiometer was tested The experimental results show that the spectral response Function of barrel radiometer has good linear characteristics, high repeatability and the standard deviation of one-term coefficient is 2.78E-17.