Optical fiber detection system using an intensity-modulating sen

Details Optical fiber detection system using an intensity-modulating sen Optical fiber detection system using an intensity-modulating sen

1986-07-24

1989-12-19

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356345, G01B 902

Patent

active

048879010

ABSTRACT:
The present invention relates to optical fiber measuring systems comprising a light source, a modulator for modulating the amplitude of the light signal emitted by the light source at a modulation frequency, an optical connecting fiber, a resonant cavity, a phase detector and a phase comparator. According to the invention, a sensor which is sensitive to an ambient parameter is incorporated into the cavity such that a variation in the parameter causes a variatioin in the phase of the signal at the modulation frequency. The invention can be applied to measuring systems for use in a severe environment.

REFERENCES:
patent: 4533247 (1985-08-01), Epworth
"Passive Fiber-Optic Ring Resonator for Rotation Sensing", Meyer et al., Optics Letters, 12-1983.
Second International Conference Relating to Optical Fiber Sensors, pp. 387-390, Sep., 1984, "Displacement Sensor Using A Compensated Fibre Link", D. E. N. Davies, et al.

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