Focal plane alignment for remote sensing camera with dual focal plane of large field of view interval

The dual channel array focal plane camera with large field of view interval is rare in the previous types of remote sensing cameras. Since it works in the near-infrared spectrum segment, the alignment method of multi-channel camera previously applied in the visible spectrum segment is no longer applicable. The installation and adjustment method was studied. Firstly, the alignment principle was analyzed from the optical point of view, the mathematical model was abstracted and analyzed in detail, and the system error formula was obtained. In the past, the error of this system was very small and had not been paid attention to, but for the remote sensing camera here, its error had seriously affected the test accuracy. After that, the detailed analysis of the alignment test scheme was carried out, and the test scheme of one-dimensional turntable was proposed. Compared with the two-dimensional turntable scheme, the error source was less, the accuracy was higher, and the resources could be saved. Finally, the actual alignment test and test data processing were carried out to eliminate the influence of system error. The adjustment accuracy of focal plane was 1.0 μm, and the alignment result was better than 0.3 pixels. The star point image curve of focal plane obtained was basically consistent with the theoretical design result. The results show that the test method proposed has high precision and adjustment scheme is reasonable and feasible.