Novel fiber optic hydrophone for ultrasonic measurements

Author

Vengsarkar, Ashish M. ; Murphy, Kent A. ; Tran, Tuan A. ; Claus, Richard O.

Author_Institution

Fiber & Electro-Opt. Res. Center, Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

fYear

1988

fDate

2-5 Oct 1988

Firstpage

603

Abstract

Dual-purpose fiber-optic microbend loss sensors have been developed for measurement of underwater acoustic wave amplitudes and for detection of the direction of wave propagation. Use is made of cylindrical sensing elements with external threads with fiber would around them. Axial slots, cut along the length of the cylinder and deeper than the threads, provide the microbends. Two different construction schemes for cylindrical sensing elements are considered. The dual-purpose hydrophones have been characterized for frequencies ranging from 15 kHz to 75 kHz. Long fibers with different coatings and sensing elements with different variations in mechanical wavelengths can be shown to improve the sensitivity of the sensing system

Keywords

fibre optic sensors; hydrophones; ultrasonic measurement; 15 to 75 kHz; cylindrical sensing elements; fiber optic hydrophone; mechanical wavelengths; sensitivity; ultrasonic measurements; underwater acoustic wave amplitudes; Acoustic measurements; Acoustic sensors; Loss measurement; Optical fiber losses; Optical fiber sensors; Optical fibers; Propagation losses; Sonar equipment; Ultrasonic variables measurement; Yarn;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1988. Proceedings., IEEE 1988

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/ULTSYM.1988.49448

Filename

49448