新型高准确度分光光度计的设计与测试

目前，干涉滤光片已广泛运用到辐射度学测量、光度学测量等领域，为保证其光谱透过率测量的高准确度，提出了采用基于DK242单色仪，入射、出射光路独立设计的全自动，单光路分光光度计，其测量部分采用了硅探测器与积分球组合的探测单元，提高了测量的准确度。装置的不确定度源包括波长定标、探测器均匀性、系统稳定性、光束移位等，装置整体不确定度达到8.78×10^-3，满足设计要求。

Design and testing of high-accuracy spectrophotometer

Interference filters are used in many fields, such as radiometric and photometric measurements and so on. For high-accuracy measurement of spectral transmittance of interference filter, an automated, single-beam spectrophotometer based on DK242 double monochromator is developed, whose input optics and output optics are designed independently. In order to improve the accuracy of measurement, the averaging detector unit with a silicon detector is introduced into the measurement system. The source of the uncertainties includes wavelength calibration, detector nonlinearity, system instability, beam displacement and so on. A total uncertainty of 8.78×10-3 is estimated for transmittance measurements of interference filters, which meets the requirement of the design.