[1] [1] Deng Zhi. Survey and Analysis of Crack of Cable-stayed Bridge High Tower Column [D]. Chongqing: Chongqing Jiaotong University, 2010.

[2] [2] Fan Hong, Ke Yong, Tang Tang. Study on cable breakage and fracture of long span cable-stayed bridge [J]. Highway, 2010, (4): 164-169.

[3] [3] Gao Shuling, Xu Shilang. Critical concrete crack length determination using strain gauges [J]. J Tsinghua Univ (Sci & Tech), 2007, 47(9): 1432-1434.

[4] [4] Yu Jiayong, Peng Wanghu, Zhu Jianjun, et al.. Research on the application of measurement robot to bridge inspection [J]. Central South Highway Engineering, 2007, 32(3): 33-36.

[5] [5] Zhao Qiang, Zhong Youming, Zhou Jianting. Remote crack monitoring system of bridge based on embedded technology and GPRS [J]. Journal of Chongqing Jiaotong University (Natural Science), 2010, 29(5): 685-687.

[6] [6] Zhu Xinliang. Application of a High-Speed High-Precision Optical Sensor Technology in Bridge Monitoring [D]. Ji′nan: Shandong University, 2012.

[7] [7] Song Pingli. Crack Detection of Bridge on Video Image [D]. Wuhan: Wuhan University of Technology, 2010.

[8] [8] Xu Bing. A Study on the Bridge Diseases Inspection and the Cracks Measurement Based on the Imagery Processing Technology [D]. Xi′an: Changan University, 2009.

[9] [9] Li Xuyang, Li Yingcai, Ma Zhen, et al.. Optical system design of space camera with large F number and long focal length [J]. Acta Optica Sinica, 2010, 30(7): 2093-2097.

[10] [10] Guo Yongxiang, Li Yingcai, Liang Tianmei, et al.. Optical design of the uncoaxial three-mirror system with wide field of view [J]. Acta Optica Sinica, 2010, 30(9): 2680-2683.

[11] [11] Li Xuyang, Li Yingcai, Ma Zhen, et al.. Optical system design of space camera with long focal length and correction of image distortion [J]. Acta Optica Sinica, 2010, 30(9): 2657-2661.

[12] [12] M Laikin. Lens Design (Fourth Edition) [M]. Zhou Haixian, Cheng Yunfang, Transl.. Beijing: China Machine Press, 2009. 84-85.

[13] [13] Wang Zhijiang. Handbook of Practical Optical Technology [M]. Beijing: China Machine Press, 2006. 258-259.