新型紫外波段星载太阳定标板漫反射特性测量

星载太阳定标漫反板的漫反射朗伯特性及其辐照衰减特性直接决定了空间遥感仪器在轨辐射定标长期的精度和稳定性。为保证紫外高光谱探测仪的在轨辐射定标精度，在介绍目前常用太阳定标漫反板材料的基础上，提出了一种新型的紫外波段漫反板备选材料：高纯度不透明熔融石英材料HOD，并比对测试了该新型HOD漫反板与传统铝制漫反板的漫反射朗伯特性和辐照衰减特性。结果表明，32个等效太阳时(32ESH)的真空紫外辐照后，HOD漫反板在290 nm衰减为7.5%，优于传统铝制漫反板的10%。并且铝制漫反板在290 nm附近的朗伯特性最大余弦偏差约为40%，而HOD漫反板约为10%。因此，新型HOD漫反板在紫外波段的漫反射特性优于传统的铝制漫反板，可提高空间紫外遥感仪器的在轨辐射定标的长期精度。

Diffuse reflection characteristics measurement of new type spaceborne solar calibration diffuser in ultraviolet band

The Lambertian diffuse reflectance characteristics of the spaceborne solar calibration diffuser and its radiation attenuation characteristics directly determine the long-term accuracy and stability of the on-orbit radiation calibration of space remote sensing instruments. In order to effectively improve the on-orbit radiation calibration accuracy of spaceborne ultraviolet hyperspectral detection instruments, based on the introduction of commonly used solar calibration diffuse reflector materials in the field of space remote sensing, a new type of ultraviolet wavelength diffuser material is proposed: high purity opaque fused silica material HOD, and the diffuse reflection Lambertian characteristics and radiation attenuation characteristics of the new high purity opaque Fused silica HOD diffuser and the traditional aluminum diffuser are compared by testing. The results show that after 32 equivalent solar hours (32ESH) of vacuum ultraviolet irradiation, the attenuation of the high purity opaque Fused silica HOD diffuser at the wavelength of 290 nm is 7.5%, which is better than 10% of the traditional aluminum diffuser. And the Lambertian maximum cosine deviation of the traditional aluminum diffuser around 290 nm is about 40%, while the high purity opaque Fused silica HOD diffuser is about 10%. Therefore, the diffuse reflection characteristics of the new high purity opaque Fused silica HOD diffuse reflector in the ultraviolet band are better than those of the traditional aluminum diffuser. The high purity opaque Fused silica hod diffuser has better diffuse reflection Lambertian characteristics and stronger vacuum ultraviolet radiation attenuation characteristics, so it can improve the long-term accuracy of the on-orbit radiometric calibration of space ultraviolet remote sensing instruments.