LI Zhao-hui, WU Ke-yong . Application of centroid sensing method in real time autofocusing system used in space camera[J]. Editorial Office of Optics and Precision Engineering, 2000,(4): 335-339
LI Zhao-hui, WU Ke-yong . Application of centroid sensing method in real time autofocusing system used in space camera[J]. Editorial Office of Optics and Precision Engineering, 2000,(4): 335-339DOI:
Auto-focusing technique is an important method for ensuring high quality image of space camera.In order to refocus in-flight for space camera
a precise auto-focusing system with auto-collimatic method is introduced
in which two pentagonal prisms are substituted for a large mirror
a low power laser is used as the light source and CCD as photoelectric converting device. This system has compact structure and reliable properties. The resolution of the whole measuring system has been improved by the use of signal processing techniques in centroid sensing method such as choosing threshold and data smoothing
the experiments show that the measuring resolution is less than 5μm.
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