Performance Comparison of Long-Wave Infrared Imaging Spectrometer Between Dyson Form and Offner Form

• 作 者: Jiayin Sun Ying Liu Qiang Sun Chun Li Jian Wang Yang Jiang
• 机 构: Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciencesty of Chinese Ac
• 出 处: Journal of Harbin Institute of Technology
• 发表日期: 2017年02期
• 关键词: long-wave infrared imaging spectrometer grating constant concentric configuratio

In view of the difficulties in traditional long-wave infrared imaging spectrometer which is hard torealize a high signal-to-noise ratio and miniaturization as well under the weak remote sensing signal,Offnerconvex grating spectrometer and Dyson concave grating spectrometer,both having concentric structure,aredesigned and analyzed in the band of 8-12μm.The diffraction angle expressions of the two spectrometers areobtained and the diffraction characteristics are acquired.Both of the spectrometers are designed in Zemaxenvironment under different F-numbers and different grating constants with the same slit,spatial resolution,spectral resolution and detector.The results show that Dyson grating spectrometer possesses the advantages ofhigher throughput and smaller volume,and Offner grating spectrometer possesses the advantage of moreaccessible material and the absence of chromatic aberration.The differences between Dyson form and Offnerform show that the former is a better choice in the long-wave infrared imaging spectrometer.

In view of the difficulties in traditional long-wave infrared imaging spectrometer which is hard torealize a high signal-to-noise ratio and miniaturization as well under the weak remote sensing signal, Offnerconvex grating spectrometer and Dyson concave grating spectrometer, both having concentric structure, aredesigned and analyzed in the band of 8-12 μm. The diffraction angle expressions of the two spectrometers areobtained and the diffraction characteristics are acquired.Both of the spectrometers are designed in Zemaxenvironment under different F-numbers and different grating constants with the same slit, spatial resolution, spectral resolution and detector. The results show that Dyson grating spectrometer possesses the advantages of throughput throughput and smaller volume, and Offner grating spectrometer possesses the advantage of moreaccessible material and the absence of chromatic aberration.The differences between Dyson form and Offnerform show that the former is a better choice in the long -wave infrared imaging spectrometer.