Passive, remote sensor

Details Passive, remote sensor Passive, remote sensor

2011-05-10

2011-05-10

Williams, Hezron (Department: 2856)

Measuring and testing

Vibration

Sensing apparatus

Reexamination Certificate

active

07938010

ABSTRACT:
A passive, remote sensor including an optical subsystem for receiving electromagnetic radiation scattered off a surface. A detector is responsive to electromagnetic radiation received by the optical subsystem and generates a composite signal comprising a DC current component and an AC current component. A filter extracts the DC current component from the composite signal. A light emitting device is driven by the DC current component. A detector is responsive to the light emitting device and is connected to the first detector to subtract at least a portion of the DC component from the composite signal producing a modified signal. An amplifier is responsive to the modified signal detects vibrations of the surface to be detected.

REFERENCES:
patent: 5420379 (1995-05-01), Zank et al.
patent: 6232910 (2001-05-01), Bell et al.
patent: 6400308 (2002-06-01), Bell et al.
patent: 6520308 (2003-02-01), Martin et al.
patent: 6766892 (2004-07-01), Martin et al.
patent: 7213697 (2007-05-01), Martin et al.

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