一种Offner型小型短波红外成像光谱仪

通过对Offner分光光学系统分析，给出了快速计算初始结构参数公式，根据算得的初始结构参数优化出一套适用于短波红外(1 000～2 500 nm)的分光光学系统，设计的光学系统相对孔径大(F/#2.2)、光谱分辨率高(优于10 nm)和入射狭缝长(12 mm)，在整个波长和视场范围内调制传递函数MTF均大于0.5。完成的成像光谱仪整机体积小，重量轻(小于5 kg)，仪器测试结果表明，全光谱范围内光谱线性好，光谱标定后波长精度优于4 nm, 通过对不同波段分辨率测试，全波长范围内光谱分辨率与设计相符，动态成像实验表明, 光谱图像清晰并且光谱数据质量佳。

Design of a SWIR Offner Imaging Spectrometer

By analyzing the offner spectroscopic optical system ,an equation to calculate quickly the initial structural parameters is summed .Based on the calculated initial structural parameters we optimized a set of spectral optics used for short-wave infra-red (1000~2 500 nm) ,which has been designed with large optics aperture (F/# 2.2) ,high spectral resolution (better than 10 nm) and long entrance slit (12 mm) .Within the entire field of view and wavelength ,the modulation transfer function MTF is greater than 0.5 .The complete imaging spectrometer with smaller size and light weight (less than 5 kg) .The instrument test re-sults show that the spectral linearity over the whole spectral range is good ,and after spectral calibration the wavelength accuracy is more than 4 nm .The resolution tests of different bands shows that the spectral resolution over the full wavelength range is consistent with the design ,and dynamic imaging experiments show that the spectral images are clear and the spectral data has good quality .