Measurement of multi-directional azimuth and tilt angles using an improved DVD pickup head with a CMOS sensor: A simulation design study

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.