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20 September 2002 Application of PSD in a plumb line coordinator
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The double devices of position-sensitive detector (PSD) technique is studied in this paper. This apparatus which is used as a plumb line coordinator can be used to observe dam deformation, and so on. Two narrow gaps in this apparatus are proposed to replace the lens which are apt to become mildewed in moist circumstance. Two PSDs are set up in orthogonal directions. And the two gap-PSD systems can be employed for measuring a plumb line's two-dimensional displacement. Experiments are aided by a computer which is used to handle the data collected by PSD. Using this system to track the position of a plumb line, the accuracy is better than 0.05 mm.
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Yunfei Xu, Min Jin, Hongbo Cai, and Xiangdong Xu "Application of PSD in a plumb line coordinator", Proc. SPIE 4919, Advanced Materials and Devices for Sensing and Imaging, (20 September 2002);

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