Identification system using a laser retro-reflecting and modulat

Details Identification system using a laser retro-reflecting and modulat Identification system using a laser retro-reflecting and modulat

1987-07-24

1989-12-12

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455605, 455607, 350358, H04B 900

Patent

active

048873101

ABSTRACT:
The system comprises a laser transmitter/receiver set which transmits laser radiation and processes the radiation received by retro-reflection and a remotely-placed retro-reflecting and modulating set which modulates the laser radiation and sends it back to the receiver. These two sets are mechanically separated, and one can be placed on board an aircraft and the other on the ground, for example. The modulation is done by a frequency-controlled acousto-optical deflector to obtained the operating conditions of diffraction according to Bragg's law. The laser radiation, after crossing the deflector, is sent back by a catadioptric device along its original path. The double passage through the deflector, on the way out and back, produces a shift in the frequency of the laser radiation, the value of the said shift being equal to twice the control frequency of the deflector. A double axis or single axis optical scanning device is added on, for functioning in a wide field.

REFERENCES:
patent: 3055258 (1962-09-01), Hurvitz
patent: 3383627 (1968-05-01), Desmares
patent: 3984686 (1976-10-01), Fletcher et al.
patent: 3989942 (1976-11-01), Waddoups
patent: 4143263 (1979-03-01), Eichweber
patent: 4443066 (1984-04-01), Freyre
patent: 4466738 (1984-08-01), Huang et al.
patent: 4662003 (1987-04-01), Eichweber
Abbiss et al; "Deviation-Free Brayg Cell Frequency-Shifting;"Applied Optics; vol. 20; No. 4; Feb. 15, 1981; pp. 588-590.

Affiliated with

Also associated with

Rating

Identification system using a laser retro-reflecting and modulat does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Identification system using a laser retro-reflecting and modulat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Identification system using a laser retro-reflecting and modulat will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2127195