Demodulators for optical fiber interferometers with [3.times.3]

Details Demodulators for optical fiber interferometers with [3.times.3] Demodulators for optical fiber interferometers with [3.times.3]

1992-08-17

1994-05-17

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

25022719, 25022727, G01B 902

Patent

active

053132661

ABSTRACT:
A highly sensitive optical fiber interferometer sensor comprising a laser light source, a [2.times.2] optical fiber coupler to split the beam in two, a differential transducer which converts a signal of interest into optical phase shift in the laser light transmitted through the two optical fibers in the interferometer and a [3.times.3] optical fiber complex which recombines the two beams, producing interference which can be electronically detected. The use of the [3.times.3] coupler permits Passive Homodyne demodulation of the phase-modulated signals provided by the interferometer without feedback control or modulation of the laser itself and without requiring the use of electronics within the interferometer.

REFERENCES:
patent: 4557414 (1986-03-01), Migliori et al.
patent: 4893930 (1990-01-01), Garrett et al.
patent: 4951271 (1990-02-01), Garrett et al.
patent: 4959539 (1990-09-01), Hofler et al.
patent: 5042157 (1991-08-01), Garrett et al.
Cameron, Charles B. "Recovering Signals from Optical Fiber Interferometric Sensors" Naval Postgraduate School, Monterey, Calif. Published Aug. 19, 1991.
Crooker, Carol Mae "Two Demodulators for High Sensitivity Fiber Optic Interferometric Sensors" Naval Postgraduate School, Moterey, Calif. 1987.
Brown et al. "A Symmetric 3.times.3 Coupler Based Demodulator for Fiber Optic Interferometric Sensors" Proceedings of the SPIE: Fiber Optic and Laser Sensors, V. 1584, pp. 328-336 Dec. 31, 1991 USA.
Crooker et al."Fringe Rate Demodulator for Fiber Optic Interferometric Sensors" Proceedings of the SPIE: Fiber Optic and Laser Sensors, 838, pp. 329-331 (1987) USA.
Koo et al. "Passive Stabilization Scheme for Fiber Interferometers Using (3.times.3) Fiber Directional Couplers" Appl. Phys. Lett.41 (7) (1982) USA.
Dandridge "Fiber Optic Sensors Based on the Mach-Zehnder and Michelson Interferometers" in Fiber Optic Sensors E. Udd (Editor), John Wiley & Sons, New York (1991) USA.
Hofler et al. "Thermal Noise in a Fiber Optic Sensor", J. Acoust. Soc. Am. 84 (2) pp. 471-475 (1988) USA.
Gardner et al. "A Fiber-Optic Interferometric Sensometer", J. Lightwave Tech, LT-5 (7) pp. 953-960 (1987) USA.
Danielson et al. "Fiber-Optic Ellipsoidal Flextensional Hydrophones" J. Lightwave Tech vol. 7 (12), pp. 1995-2002 (1989) USA.
Garrett et al. "A General Purpose Fiber-Optic Hydrophone Made of Castable Epoxy" Proceedings of the SPIE: Fiber Optic and Laser Sensors pp. 13-29 (1990) USA.

Affiliated with

Also associated with

Rating

Demodulators for optical fiber interferometers with [3.times.3] does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Demodulators for optical fiber interferometers with [3.times.3] , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Demodulators for optical fiber interferometers with [3.times.3] will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-880900