Optically Multiplexed Interferometric Fiber Optic Sensor System

K. L. Belsley; J. B. Carroll; L. A. Hess; D. R. Huber; D. Schmadel

doi:10.1117/12.949799

3 January 1986 Optically Multiplexed Interferometric Fiber Optic Sensor System

K. L. Belsley, J. B. Carroll, L. A. Hess, D. R. Huber, D. Schmadel

Proceedings Volume 0566, Fiber Optic and Laser Sensors III; (1986) https://doi.org/10.1117/12.949799
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

A sensor system where a number of Fabry-Perot interferometer sensors are placed in series on a single-mode fiber is discussed. Each Fabry-Perot sensor is resonant within a unique bandpass of optical wavelengths and transmits with small attenuation at all other wavelengths. Fiber Fabry-Perot interferometers with narrow-band resonances are formed by placing a matched pair of bandpass reflectors on the fiber. The sensor system has three major subsystems: a swept frequency laser, frequency selective Fabry-Perot sensors, and demodulation hardware. A grating formed by holographic process is placed in the evanescent field to produce a frequency selective reflector. Individual sensors are polled by a frequency swept laser. As the laser wavelength is scanned over the resonance bandpass of the first sensor, Fabry-Perot fringes from the first sensor are read out. As the laser continues to sweep its optical frequency, the first sensor's gratings no longer act as reflectors; the sensor becomes transparent to the optical probe. After a sufficient optical wavelength guard band, the resonance band of the second sensor is reached and fringes from the second sensor are read out. Fabry-Perot phase and fringe order information are recovered by a combination of optical and electronic signal processing. The optical processor is a second Fabry-Perot interferometer which is used as an analyzer to aid recovery of the phase information.

Citation Download Citation

K. L. Belsley, J. B. Carroll, L. A. Hess, D. R. Huber, and D. Schmadel "Optically Multiplexed Interferometric Fiber Optic Sensor System", Proc. SPIE 0566, Fiber Optic and Laser Sensors III, (3 January 1986); https://doi.org/10.1117/12.949799

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