caa a22 4500 445858508 CHVBK 20180317145436.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10946-011-9244-9 doi (NATIONALLICENCE)springer-10.1007/s10946-011-9244-9 Qing-bin Tong School of Electrical Engineering, Beijing Jiaotong University, 100044, Beijing, China aut Accurate measurement method of the thickness of a quartz pendulous reed by combining polarized reflectance and vision image [Elektronische Daten] [Tong Qing-bin] The detection of thickness provides important information on the production process of the quartz pendulous reed (QRP). Through real-time detection of QPR thickness, high-quality products can be produced, and defective products can be identified and removed. In order to improve detection accuracy and efficiency, a novel noncontact method for measuring the QPR thickness by combining the polarized reflectance and vision image is presented, which can be automated. Based on Snell's law of fundamental optics, the image of the laser spot is obtained by a laser vision system. The selection criterion of the laser incident angle is analyzed. An improved edge detection algorithm is proposed to locate the subpixel edge of the laser spot, and the calculation method of the laser spot center is presented based on a set of subpixel edge-point data obtained by defining an error function which is to optimize the distribution of data points and minimize it. Experimental results show that the method proposed has good stability and high measurement accuracy, which can achieve noncontact accurate measurement of QPR thickness. Springer Science+Business Media, Inc., 2011 quartz pendulous reed nationallicence thickness measurement nationallicence polarized reflectance nationallicence vision image nationallicence subpixel edge localization nationallicence Zernike moments nationallicence ellipses fitting nationallicence Journal of Russian Laser Research Springer US; http://www.springer-ny.com 32/6(2011-11-01), 537-546 1071-2836 32:6<537 2011 32 10946 https://doi.org/10.1007/s10946-011-9244-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10946-011-9244-9 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Qing-bin Tong School of Electrical Engineering, Beijing Jiaotong University, 100044, Beijing, China aut NATIONALLICENCE 773 0- Journal of Russian Laser Research Springer US; http://www.springer-ny.com 32/6(2011-11-01), 537-546 1071-2836 32:6<537 2011 32 10946 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer