摘要： We present a new detection method for an improved DVD pickup head system capable of measuring the multidirectional azimuth and small tilt angles. A complementary metal-oxide semiconductor (CMOS) sensor is used to capture images and analyze the slight shift of the central position of the beam shape when the test plane rotates to create a tilt angle and angular signal. The proposed detection method can determine the azimuth angle of the test plane from 0° to 360° at intervals of 5°. The tilt angle measurement is varied from 0° to 4.2° at intervals of 0.3°. The simulation results show that the improved DVD pickup head system can recognize multi-directional azimuth angles of the test plane under a small tilt. ► A new method using a DVD pickup head with a laser expander for detecting the multidirectional azimuth angle under a small tilt was presented. ► The proposed detection method can determine the azimuth angle of the test plane from 0° to 360° at intervals of 5°. ► The elevation angle measurement is varied from 0° to 4.2° at intervals of 0.3°. ► Our proposed system can detect more azimuth angles than an optical pickup head with a PDIC detector. 出版者： Elsevier Ltd 出版日期： 2013-06-01 出處： Optics and laser technology, 2013-06, Vol.48, p.194-199 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2012 Elsevier Ltd 識別號： ISSN: 0030-3992 識別號： EISSN: 1879-2545 識別號： DOI: 10.1016/j.optlastec.2012.10.019
