Precision Focal Measuring System Based on CCD Aerial Cameras

Abstract:

In view of bigger error (0.24%) of conventional measuring method, this paper focuses on a bigger aperture aerial camera focus measuring system and discusses measuring principle and structure of the system. The image in this system is received by the collimator of long focus and area CCD (Charge Coupled Devices) camera. Using dynamic scanning and center of gravity method, the system measures effectively the location and size of the optimum image. The image resolution of CCD can be up to one tenth of the size of the photosensitive sensor and the precision of 0.1percent of focus measuring can be obtained. The problem of the larger error of conventional measuring method is salved fundamentally. The accurate, real-time and on-line measurement of the focus of aerial camera lens can be realized and the exact determination of the position of the surface can be determined.

• Periodical: Advanced Materials Research (Volume 571)
• Pages: 304-307
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.571.304
• Online since: September 2012
• Authors: Mei Zhao, Yu Fang Sha, Fei Guo, Ming Quan Yang
• Keywords: Aerial Camera, Centre of Gravity Method, Charge Coupled Devices, Focus

References

[1] Yuliang Zhao, Kaiduan Li and Qingchen Zhang: Aerial Measure and Test Technology, Vol. 22(1) (2002), p.10. In Chinese.

[2] Chaohui Li, Haipeng Kuang: Chinese Journal of Scientific Instrument, Vol. 23(2) (2002), p.166. In Chinese.

[3] Haipeng Kuang, Linpei Zhai: Optical Technique, Vol. 30(1) (2004), p.122. In Chinese.

[4] Xingsheng Xie, Shanchang Tao and Xiuji Zhou: Chinese Science Bulletin, Vol. 44(1) (1999), pp.97-100. In Chinese.

[5] Qing-you Wang. Application Technology of CCD, Press, China (2000).

[6] Yu Zhang: Journal of Optoelectronics·Laser, Vol. 14(10) (2003), p.1118. In Chinese.

[7] Datu Su, Liping Zhao and Dingguo Sha. Optical Testing Technology, Press, 1996. 19-20.