Diffuse surface interference position sensor
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United States of America Patent
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-
Jul 21, 1998
Grant Date -
N/A
app pub date -
Feb 20, 1997
filing date -
Feb 20, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Position of a diffusely scattering surface is detected by interfering backscattered light from respective input beams which illuminate a common spot. Through polarization of the input beams and appropriate filtering, backscattered light is isolated from specularly reflected light and interfered to form a fringe pattern on a detector. The position sensor has particular applicability as a push pin sensor in a hard disk servo system.
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