Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Reexamination Certificate
2008-01-09
2010-10-05
Connolly, Patrick J (Department: 2877)
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
C356S004090
Reexamination Certificate
active
07808618
ABSTRACT:
Methods and apparatus are provided for integrating various optical components onto a planar substrate using a single semiconductor material system to produce an accelerometer. A light beam is generated on the semiconductor optical accelerometer. The light beam is split to form two light beams using a multimode interference (MMI) coupler. One of the two light beams that is formed is directed towards a reference mirror and the other is directed towards a flexured mirror. The flexured mirror moves as a result of acceleration and thereby reflects the light beam with a different light beam characteristic. The light beams are combined by the MMI coupler to produce an interference light beam. A microprocessor measures acceleration based on the differences in light beam characteristics of the reflected light beams. Along the optical path light beam detectors measure various beam characteristics. The microprocessor accounts for characteristics measured by the detectors when computing acceleration.
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Hakimi Farhad
Tawney Jesse
Connolly Patrick J
Ropes & Gray LLP
The Charles Stark Draper Laboratory Inc.
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