分光测色仪中的光谱仪系统

根据分光测色仪的应用需要,对分光系统、光电接收系统及相关电路组成的光谱仪进行了模块化设计,以方便仪器的整体设计、装调和测试。考虑分光测色仪是非成像光学仪器,故提出用光纤来连接各光学模块。根据应用需求提出了光谱仪的主要技术指标,所设计光谱仪很好地完成了球差和彗差的校正。分析了用滤光片消除二级衍射光谱的方法,解决了光纤和光谱仪数值孔径不匹配的问题。研制了光谱仪系统,其外形尺寸为130mm×90mm×45mm。实验测试显示,在狭缝宽度为50μm时,光谱仪各波段的光谱分辨率都可以达到2nm。对光谱仪进行了波长定标,定标精度小于0.2nm,整个工作波段占401个像元,满足1nm的波长输出间隔的设计要求。该光谱仪的可弯曲光纤和电子线路便于整机灵活布局与模块拆卸,同时方便单独测试。所述方法为分光测色仪的整机研制与测试打下了良好的基础。

Design of spectrometer in color measuring spectrophotometer

According to the application demands of a color measuring spectrophotometer, the spectrometer composed of an optical system, a photoelectric receiving system and relevant circuits was proposed in a modular design to improve its facilitate design, alignment and test. As the spectrophotometer is a non-imaging optical instrument, every optical module was connected by optical fibers. The application requirements of the spectrophotometer were analyzed, its specifications were put forward, and spherical aberration and coma aberration were well corrected. A way to eliminate the secondary diffraction spectrum with an optical filter was analyzed in detail and the contradiction of unmatched numerical apertures between fiber optics and spectrometer was solved. A spectrometer with a dimension of 130 mm×90 mm×45 mm was established, and experimental test shows that the spectrometer achieves a spectral resolution of 2 nm in the whole band with the slit width of 50 μm. The spectrometer wavelength is calibrated and the accuracy is less than 0.2 nm. The entire band of the spectrometer uses 401 pixels, which meets the design requirements of the wavelength interval of 1 nm. The spectrometer with flexible fiber optics and electronic circuit is convenient for the layout of whole instrument, disassembly of modules and the individual test of the spectrometer, which lays a good foundation for the development and test of the whole spectrophotometer.