Experimental study of the effect of light source spot size on measure error of PSD Online publication date: Mon, 10-Dec-2018
by Xiaohong Lu; Yingche Xv; Wentao Wang; Yang Zhou; Steven Y. Liang
International Journal of Manufacturing Research (IJMR), Vol. 14, No. 1, 2019
Abstract: The energy distribution of the incident light spot on position-sensitive detector (PSD) screen is uneven and the output coordinate value is the energy centre of the light spot. Measurement error caused by the deviation between the geometric and gravity centre of the light spot will occur. The deviation will increase with the increase of the diameter of the light spot. There is no quantitative research on the position error caused by the changes of the light spot diameter and the distance from the light spot to the PSD. To evaluate the magnitude of the error, the infrared spotlight is selected as the target light. The changing pattern that the spot diameter varies with the distance between the light source and lens is studied. Additionally, the effect of the spot size on the PSD measure error is studied. The research provides reference for error evaluation of the distance and position detection of PSD. [Submitted 5 July 2017; Accepted 24 December 2017]
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