OH radicals in the upper and middle atmosphere are important oxidants and play an important role in atmospheric photochemistry. Current space-based payload can only obtain profile information. In view of the inhomogeneity of atmospheric two-dimensional distribution field, a hyper-spectral OH radical tomography detection scheme based on onedimensional imaging spatial heterodyne spectroscopy is proposed. Horizontal and vertical multi-dimensional atmosphere are detected by combining two orthogonal field-of-view one-dimensional imaging spatial heterodyne spectrometers, and the multi-line-of-sight crossed required for atmospheric tomography detection is achieved by platform movement. Based on this technical scheme, the optical and structural design of the prototype is carried out, and the data form of the interferogram acquired on-orbit is simulated. OH radicals can’t be measured on the ground, so the OH radicals can be obtained by photochemical reaction chamber in the laboratory. The OH measurement results obtained by the prototype agree with the HITRAN simulation results.
Combined with two-channel one-dimensional field of view imaging technique and Spatial Heterodyne Spectroscopy (SHS), hyper-resolution spatial heterodyne spectrometer can be used for hydroxyl radical OH detection with limb observations from a satellite. The accuracy of field registration of the spectrometer two channel directly affects the detection accuracy of hydroxyl radical OH density, and the spatial stop and spectral stop of each channel are in different positions on the path of light. The method of spatial and spectral dimension field registration is given first, and then the method of field of view registration between channels is given. The quantitative effect of the parameters of the registration method on the accuracy of the field registration is analyzed theoretically, and the verification test is carried out based on the long focal length collimator. The results show that the accuracy of field of view registration in this paper is better than 99.2%. It provides a theoretical basis for the tolerance of the spatial field of view of the spectrometer.
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