Title :
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
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;
Conference_Titel :
Ultrasonics Symposium, 1988. Proceedings., IEEE 1988
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.1988.49448
