Method and apparatus for measuring displacement
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United States of America Patent
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Issued Date -
Nov 24, 2005
app pub date -
May 24, 2004
filing date -
May 24, 2004
priority date (Note) -
Abandoned
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Abstract
In a method and apparatus for measuring displacement, an optical modulator includes a magneto-optical recording layer recorded with a plurality of light-reflecting graduation regions. The light-reflecting graduation regions include alternately disposed first and second graduations. The first graduations have a first magnetization direction. The second graduations have a second magnetization direction different from the first magnetization direction. A light source is operable so as to generate a light beam that is incident on the magneto-optical recording layer. The optical modulator is movable relative to the light source such that the light beam is reflected in sequence by consecutive ones of the light-reflecting graduation regions recorded on the magneto-optical recording layer. An analyzing module analyzes changes in polarization characteristics of the light beam reflected from the magneto-optical recording layer to determine extent of displacement of the optical modulator relative to the light source.
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