Ultrasonic hydrophone based on short in-fiber Bragg gratings

N.E. Fisher, D.J. Webb, C.N. Pannell, D.A. Jackson, L.R. Gavrilov, J.W. Hand, L. Zhang, I. Bennion

Research output: Contribution to journalArticlepeer-review


We investigate the feasibility of using in-fiber Bragg gratings for measuring acoustic fields in the megahertz range. We found that the acoustic coupling from the ultrasonic field to the grating leads to the formation of standing waves in the fiber. Because of these standing waves, the system response is complex and, as we show, the grating does not act as an effective probe. However, significant improvement in its performance can be gained by use of short gratings coupled with an appropriate desensitization of the fiber. A noise-limited pressure resolution of ˜4.5 × 10-3 atm/vHz was found.
Original languageEnglish
Pages (from-to)8120-8128
Number of pages9
JournalApplied Optics
Issue number34
Publication statusPublished - 1 Dec 1998

Bibliographical note

© 1998 Optical Society of America This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-34-8120. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


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