Fiber optic acoustic sensor

Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means

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340 15, 340 155R, 340 17R, 358112, 358901, H04B 900, G01V 100, H04B 1100

Patent

active

041623975

ABSTRACT:
An optical fiber acoustical sensor for detecting sound waves in a fluid mum. An optical fiber coil through which a light beam is transmitted is placed in a fluid medium. A sound wave propagating through the fluid medium and incident on the optical fiber coil changes the index of refraction of the optical fiber at the area of incidence. The index change causes a phase shift in the transmitted light which is detectable to denote the presence of the sound wave.

REFERENCES:
patent: 2972051 (1961-02-01), Baum
patent: 3625589 (1971-12-01), Snitzer
patent: 3920982 (1975-11-01), Harris
patent: 4068191 (1978-01-01), Zemon

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