Research on Visible Measurement of Dispersion Spot at Four Quadrant Photoelectric Detector
This paper presented a visible measurement method of dispersion spot at a four-quadrant detector based on digital image processing according to the problem of big measurement error and low efficiency in the existing production process used by the indirect measurement method of dispersion spot based on four-quadrant detector output signal. This method designed a visible measurement optical system and established a visible measurement mathematical model of four-quadrant detector dispersion spot, obtained the four-quadrant detector photosensitive surface and dispersion spot geometrical coordinates and size through digital image processing for the four-quadrant detector photosensitive surface and the dispersion spot, then got the adjustive parameter of out-of-focus distance automatically. The results of the experiment show that this method is intuitive and simple, measurement accuracy is improved from 0.02mm to 0.004mm and the measurement time is reduced from 15 minutes to 2 minutes.
Liangchi Zhang, Chunliang Zhang and Zichen Chen
L. K. He et al., "Research on Visible Measurement of Dispersion Spot at Four Quadrant Photoelectric Detector", Advanced Materials Research, Vols. 328-330, pp. 2086-2091, 2011