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长春光学精密机械与物... [1]
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会议论文 [1]
发表日期
2005 [1]
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Self Imaging technique for refocusing an aerospace camera (EI CONFERENCE)
会议论文
ICO20: Optical Devices and Instruments, August 21, 2005 - August 26, 2005, Changchun, China
Li Z.
;
Wang X.
;
Li W.
;
Kuang H.
;
Han C.
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提交时间:2013/03/25
A novel auto-focusing technique using a self imaging approach is developed for an aerospace camera having large aperture and long focus. Its optical system consists of an emitting system
receiving system
and two penta-prisms. Emitting system has three parts: a light source
beamsplitter
and aim slit. The receiving system includes a field lens
two separate lenses
and CCD. Using two little penta-prisms instead of a large planar mirror makes the autofocus system simple and compact. CCD was used as photoelectric converting device. A defocused signal is acquired by measuring the change of the two slit self-images position imaged on the CCD. A simple and compact construction of the auto-focusing system was proposed. The algorithm to calculate the moving of the slit-self images position was analyzed in order to achieve subpixel position estimation. The results of the experiments show a 10m focusing precision. The system demonstrates high resolution
easy adjustment and high reliability.
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