Chinese Optics Letters, 2011, 9 (9): 091201, Published Online: Jun. 22, 2011
Robust CCD photoelectric autocollimator for outdoor use Download: 836次
CCD光电自准直仪 户外使用 亚像素 傅里叶相移 PWM 120.0120 Instrumentation, measurement, and metrology 120.1680 Collimation 100.0100 Image processing 100.2650 Fringe analysis
Abstract
A robust charge-coupled device (CCD) photoelectric autocollimator for outdoor use is designed and demonstrated. The influence of outdoor conditions on the signal-to-noise ratio (SNR) and imaging quality of the measuring system is experimentally analyzed. The pulse width modulation technology is applied to the automatic feedback control of the actively regulated illuminating light source of the measuring system to maximize SNR while avoiding image saturation. A Fourier phase shift method for subpixel estimation is adopted to achieve high-accuracy measurement in the presence of noises. Experimental results indicate that the technologies proposed here largely improve the measuring stability, dynamic range, and accuracy of the CCD photoelectric autocollimator used outdoors.
Min Gao, Zuoren Dong, Zhenglan Bian, Qing Ye, Zujie Fang, Ronghui Qu. Robust CCD photoelectric autocollimator for outdoor use[J]. Chinese Optics Letters, 2011, 9(9): 091201.