Optical remote sensor with differential Doppler motion compensation
AssigneeHRL Laboratories, LLC
InventorsDavid M. Pepper, Monica Minden, Gilmore J. Dunning
Life of this patent
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Abstract
A system and a method for remotely sensing global motion of an ensemble of dynamically moving scattering sites. The system comprising a scattering medium under inspection, an optical transceiver and a detector in a double-pass geometry.
Claims24
An optical system for sensing net global motion components in a scattering medium, the optical system comprising:
- (a) a laser probe source for producing a beam to illuminate said scattering medium;
- (b) a wavefront-reversal device for collecting light propagated through said scattering medium and returning a conjugated beam;
- and
- (c) an optical detector for detecting and processing said conjugated beam.
An optical system for suppressing noise components produced by a scattering medium, the optical system comprising:
- (a) a laser probe source for producing a beam to illuminate said scattering medium;
- (b) a phase-conjugate mirror for collecting light propagated through said scattering medium and returning a conjugated beam;
- and
- (c) a coherent optical detector for detecting and processing said conjugated beam propagated through said scattering medium.
A remote sensor comprising:
- (a) a laser probe source for generating a beam to illuminate said scattering medium;
- (b) a wavefront-reversal device for collecting light propagated through said scattering medium and returning a conjugated beam;
- and
- (c) an optical detector for detecting and processing said conjugated beam reflected from said scattering medium.
A method for sensing net global motion components in an ensemble of dynamically moving scattering sites, the method comprising the steps of:
- (a) generating a output beam with a wavefront;
- (b) passing said output beam through a scattering medium;
- (c) forming a return beam with a wavefront from said output beam;
- (d) wavefront matching said wavefront of the return beam to said wavefront of the output beam;
- (e) passing said return beam through said scattering medium;
- and
- (f) extracting desired motion component from said return beam.
A method for suppressing noise components produced by an ensemble of dynamically moving scattering sites, the method comprising the steps of:
- (a) generating a probe beam;
- (b) propagating said probe beam through said scattering medium;
- (c) collecting light, via a wavefront-reversal device, propagated through said scattering medium and returning a conjugated beam;
- (d) detecting said conjugated beam reflected from said scattering medium;
- and
- (e) extracting desired motion component from said return beam.
Dependencies are inferred from the claim text.