Junzhou CHENG, Mingpeng HU, Yulong WANG, Wenbo YANG. Research on ground simulation testing technology of low orbit TDICCD camera image quality[J]. Optical Instruments, 2022, 44(3): 14
- Optical Instruments
- Vol. 44, Issue 3, 14 (2022)
Fig. 1. Schematic diagram of velocity height ratio (v /h ) and deflection angle (θ )
Fig. 2. MTF characterizes the attenuation effect of the system on different frequencies
Fig. 3. Calculation process of edge method
Fig. 4. System composition
Fig. 5. Optical composition of illumination system
Fig. 6. Illumination system simulation results
Fig. 7. Illustration of edge target
Fig. 8. Front view of four-dimensional motion platform
Fig. 9. MTF in TDI direction caused by different stages and speed mismatch
Fig. 10. Effects of different integration levels and different bias angles on MTF in TDI direction and vertical TDI direction
Fig. 11. Structure of collimator
Fig. 12. Wavefront test results of collimator tube (on-axis, off-axis)
Fig. 13. Measured MTF and theoretical MTF of collimator
Fig. 14. The image collected by TDICCD
Fig. 15. The MTF in the TDI direction measured by the edge method
Fig. 16. Speed mismatch ±10% and ±20%
Fig. 17. The effect of speed mismatch on MTF in the TDI direction
Fig. 18. The image obtained with or without drift angle and the MTF in the TDI direction
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Table 1. Parameter selection of 4D translation stage
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Table 2. The influence of each part of the system over the result at the Nyquist frequency when the TDI level is 32
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Table 3. Comparison of MTF theoretical value and actual value caused by velocity mismatch at 8-level TDI
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