Video high-density disk surface testing with a laser diode and a position sensor
Applied Optics, Vol. 27, Issue 22, pp. 4615-4619 (1988)
http://dx.doi.org/10.1364/AO.27.004615
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Abstract
A surface tester was developed for the VHD (video high-density disk) using an optical technique. A 10-µm diam beam from a laser diode irradiates the disk surface, and a photosensor detects the angle and the intensity of a reflected beam. Defects on the surface are found by observing changes in the photosensor signal. A microscopic examination of the disk surface revealed that the tester can detect defects larger than 10 µm. The tester classifies defects by their category and size and displays a defect map on a monitor screen. The data obtained are utilized for improving the VHD manufacturing process.
© 1988 Optical Society of America
Citation
Akira Ono, Kenji Sasaki, and Tadanori Komatsu, "Video high-density disk surface testing with a laser diode and a position sensor," Appl. Opt. 27, 4615-4619 (1988)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-27-22-4615
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