Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1989-09-08
1990-09-18
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
455615, 455616, 350 9614, G01C 308, H04B 900, G02B 610
Patent
active
049573624
ABSTRACT:
The present invention detects the difference in phase between the modulation of a received optical beam and a reference RF signal or a second modulated optical beam. The received optical beam is modulated by the reference signal and by this reference signal phase shifted 90 degrees. The difference cross modulation in these two modulated optical beams is detected. The phase difference to be detected is formed by dividing the difference cross modulation of the modulated second optical beam by the difference cross modulation of the modulated first optical beam. This quotient is proportional to the tangent of the phase difference to be detected. The optical modulation can be achieved by bulk electro-optic modulators operating on split beams, by a bulk electro-optic modulator alternatively modulating a single beam by the reference signal and the phase shifted version of the reference signal, or by changing the coupling between two parallel, matched wave guides in an integrated optic device. This system is useful in elimination of amplitude-phase cross talk in phase shift modulation optical communications systems and in three dimensional optical ranging systems.
REFERENCES:
patent: 4011445 (1977-03-01), O'Meara
patent: 4514054 (1985-04-01), Stowe
patent: 4830486 (1989-05-01), Goodwin
patent: 4831663 (1989-05-01), Smith
patent: 4893352 (1990-01-01), Welford
Buczinski Stephen C.
Environmental research Institute of Michigan
LandOfFree
Method and apparatus for electro-optical phase detection does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for electro-optical phase detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for electro-optical phase detection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1568567