Fiber optic sensor for multiple variables

Details Fiber optic sensor for multiple variables Fiber optic sensor for multiple variables

1995-10-18

1997-03-18

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356345, 359577, G01C 308, G02B 2700

Patent

active

056127782

ABSTRACT:
An optical device and method for sensing a plurality of ambient conditions (e.g., temperature and pressure) may include transmission of an optical flux through a fiber optic cable to a section of the cable that is placed where the ambient conditions are to be sensed. The section of cable includes a plurality of serially aligned sensors for reflecting the optical flux back through the cable, each of the sensors having semi-reflective surfaces at the two ends thereof for partially reflecting the optical flux. The distance between the two ends of each sensor varies primarily as a function of a different one of the ambient conditions. The optical flux is partially transmitted and partially reflected at each of the ends of the sensors and the optical flux reflected back through the cable includes an interference pattern that is a function of each sensor's end-to-end distance. A detector evaluates the interference pattern to determine the ambient conditions. The evaluation of the interference pattern may be simplified by properly selecting the reflectivity of the ends of the sensors.

REFERENCES:
patent: 5301001 (1994-04-01), Murphy et al.
patent: 5359405 (1994-10-01), Andrews
patent: 5361130 (1994-11-01), Kersey et al.
patent: 5380995 (1995-01-01), Udd et al.
patent: 5488475 (1996-01-01), Friebele et al.

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