Optical system design of hyperspectral imaging spectrometer for trace gas occultation detection
Trace gases,as important constituents of the atmosphere,play an important role in the ecology of the planet.In order to realize the requirements of wide-band,hyperspectral and all-weather continuous meas-urement,a hyperspectral imaging spectrometer operating in occultation detection mode is designed in this pa-per.The system is a dual-channel structure with a common slit,the UV-visible channel adopts a single con-cave grating,and the infrared channel adopts a structure combining Littrow and immersion grating,which ef-fectively reduces the volume.The software is used to optimize the optical structure,and the optimization res-ults show that the spectrometer operates in the range of 250-952 nm wavelengths,of which the UV-visible channel operates in the wavelength range of 250-675 nm,the spectral resolution is better than 1 nm,the MT-Fs are all higher than 0.58 at a Nyquist frequency of 20 lp/mm,and the RMS values at various wavelengths of the full-field-of-view are all less than 21 μm;the infrared channel operates in the wavelength band of 756-952 nm,the spectral resolution is better than 0.2 nm,the MTF is higher than 0.76 at the Nyquist fre-quency of 20 lp/mm,and the RMS value at each wavelength in the whole field of view is less than 6 μm,all of them meet the design requirements.It can be seen that the hyperspectral imaging spectrometer system can realize the occultation detection of trace gases.
optical system designoccultation detectiontrace gashyperspectral imaging spectrometer
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