Vibrometer system using a two input beam phase conjugate mirror
AssigneeHRL Laboratories, LLC
InventorsDavid M. Pepper, Gilmore J. Dunning
Life of this patent
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Abstract
A vibrometer for probing an object to determine its vibratory signature and a method of probing same. The vibrometer includes a laser for generating a laser beam for probing the object; a detector for detecting reflections from the object; and a two beam input phase-conjugate mirror located so as to receive a portion of the laser beam produced by the laser and a portion of the laser beam reflected from the object, the two input beam phase-conjugate mirror reflecting received diffuse signals from the object back towards the object.
Claims53
A vibrometer for probing an object to determine its vibratory signature, the vibrometer comprising:
- (a) a laser for generating a laser beam for probing the object;
- (b) a detector for detecting light reflecting from the object;
- and
- (c) a two beam input phase-conjugate mirror located so as to receive first and second portions of the laser beam produced by the laser, the first portion not impinging the object and the second portion being reflected by the object, the two input beam phase-conjugate mirror reflecting a wavefront reversed replica of signals received from the object back to the object for reflection therefrom to said detector.
An apparatus for improving a laser vibrometer, the vibrometer having a laser, said apparatus comprising a two beam input phase-conjugate mirror located so as to receive a portion of a laser beam produced by the vibrometer's laser and a portion of a laser beam reflected from an object whose vibratory signature is sought, the two input beam phase-conjugate mirror reflecting received laser light reflected by the object back towards the object as a wavefront-reversed replica of the received laser light.
A method of measuring a vibratory signature of an object, the method comprising the steps of:
- (a) impinging the object with a probing laser beam;
- (b) directing light scattered by the object to a two beam input phase-conjugate mirror;
- (c) pumping the two beam input phase-conjugate mirror;
- (d) reflecting a wavefront-reversed replica of the light directed to the two beam input phase-conjugate mirror back to the object;
- and
- (e) directing wavefront-reversed replica light reflecting from the surface of the object to a detector apparatus.
An method of improving a laser vibrometer, the vibrometer having a laser, said method comprising disposing a two beam input phase-conjugate mirror to receive a portion of a laser beam produced by the vibrometer's laser and a portion of a laser beam reflected from an object whose vibratory signature is sought, the two input beam phase-conjugate mirror reflecting received laser light reflected by the object back towards the object as a wavefront-reversed replica of the received laser light.
Dependencies are inferred from the claim text.