Fiber Bragg grating WDM underwater acoustic sensor with directivity

Nobuaki Takahashi; Kanta Tetsumura; Kazuo Imamura; Sumio Takahashi

doi:10.1117/12.339083

3 February 1999 Fiber Bragg grating WDM underwater acoustic sensor with directivity

Nobuaki Takahashi, Kanta Tetsumura, Kazuo Imamura, Sumio Takahashi

Proceedings Volume 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII; (1999) https://doi.org/10.1117/12.339083
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

An optical fiber sensor with two fiber Bragg gratings in serial connection which is multiplexed in an optical wavelength domain is constructed to sense an acoustic field in water. Both the gratings are inserted between optical isolators in order to stabilize the sensor by suppressing Fabry-Perot interference in fiber that is caused by small reflections from fiber end facet, connectors and an optical coupler. The two gratings in the sensor are confirmed to work independently and have little influence on each other. Comparison of the experimental data to the theoretical prediction shows that the developed sensor can detect the relative phase between two points in the acoustic field and thereby determine the direction of the acoustic source. Since a fiber Bragg grating can make an optical sensor of high sensitivity and wide dynamic range and can be easily multiplexed with an arrayed structure in either one or two dimensions, it will then offer a convenient tool to measure distribution of amplitude and phase of an acoustic field in water.

Citation Download Citation

Nobuaki Takahashi, Kanta Tetsumura, Kazuo Imamura, and Sumio Takahashi "Fiber Bragg grating WDM underwater acoustic sensor with directivity", Proc. SPIE 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII, (3 February 1999); https://doi.org/10.1117/12.339083

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available