The optical properties

including directional/hemisphere reflectance(DHR)

bidirectional reflectance factor (BRF)and bidirectional reflectance distribution function(BRDF) of diffuser panel used for onboard calibration for satellite optic sensors

were measured. And

in order to investigate the stability and the adaptability of the panel under on-orbit environment

series of environment simulation tests were performed . As the results indicated : The reflectance achieve 0.99 at VNIR

0.95 at SWIR; and the differences of the reflectance at VNIR are within 0.01.The variety of BRF(10°~60°) and BRDF (0°~60°) are less than 0.1

0.048

respectively，and this Lambertian property of diffuser panel is independence to spectral band and UV radiation. Atomic oxygen exposure or proton bombardment has little effect on diffuser panel’s optical properties; Some degradation of optical properties under UV radiation has been linked to degradation of organic contaminants

but this contaminants can be prevented by improvement of production protocol. The diffuser panel have gone through on-orbit level mechanical environment tests. So

high reflectance

spectral flatness

Lambertian characteristics and stability in orbit of the diffuser panel were tested

which can satisfy space application.