Displacement measurement system and method of use
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United States of America Patent
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Apr 12, 2011
Grant Date -
Mar 11, 2010
app pub date -
Sep 8, 2008
filing date -
Sep 8, 2008
priority date (Note) -
Expired
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Abstract
A measurement displacement system and method are described. The measurement displacement system comprises a sensor head configured to transmit input optical beams and to receive measurement beams. The system comprises a transmission grating configured to diffract the input optical beams into sub-beams comprising more than one diffraction order. The transmission grating is adapted move in a direction. The measurement displacement system comprises a reflective element configured to diffract the sub-beams from the transmission grating and to return the sub-beams to the transmission grating. The reflective element is substantially stationary relative to the sensor head and the transmission grating selectively recombines the sub-beams to form the measurement beams and returns the measurement beams to the sensor head.
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