Abstract

We report on a method to measure the longitudinal position of an acoustic burst, or spark, using an all-fiber Sagnac Interferometer (SI). A focused pulsed ~10 ns laser is used to ionize air creating the spark. This ionization point is situated near a coil of test fiber connected to the SI but acoustically separated from the bulk of the SI. A fast Fourier transform (FFT) performed on the temporal signal of the SI shows a series of nulls from which the position of the acoustic signal is determined. Over an SI length of ~35 km, longitudinal positions are determined to within tens of meters,corresponding to a best run percent uncertainty of 0.07%.

© 2004 IEEE

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J. Lightwave Technol. (2)

Other (10)

M. G. Kuzyk, "Using Berry's phase for position-sensitive acoustical and stress detection", J. Opt. Soc. Amer. B-Opt. Phys., vol. 19, no. 10, pp. 2346-2348, 2002.

G. A. Pavlath and H. G. Shaw, "Birefrigence and polarization effects in fiber gyroscopes", Appl. Opt., vol. 21, no. 10, pp. 1752 -1757, 1982.

J. Breguet, J. P. Pellaux and N. Gisin, "Photoacoustic detection of trace gases with an optical microphone", Sensors Actuat., no. A(48), pp. 29-35, 1995.

J. Tapia-Mercado, A. V. Khomenko and A. García-Weidner, "Precision and sensitivity optimization for white-light interferometric fiber-optic sensors", J. Lightwave Technol., vol. 19, no. 1, pp. 70-74, 2001.

K. Krakenes and K. Blotekjaer, "Sagnac interferometer for underwater sound detection: Noise properties", Opt. Lett., vol. 14, no. 20, pp. 1152-1154, 1989.

J. P. Dakin, D. A. J. Pearce, A. P. Strong and C. A. Wade, "A novel distributed optical fiber sensing system enabling location of disturbances in a Sagnac loop interferometer", SPIE, 1987.

J. P. Kurmer, et al. Distributed Fiber Optic Leak Detection, Palo Alto, CA: EPRI, 1992.

S. J. Russell and J. P. Dakin, "Location of time-varying strain disturbaces over a 40 km fiber section, using a dual-Sagnac interferometer with a single source and detector", in OFS-13, Koyngju, Korea, 1999.

S. Knudsen and K. Blotekjaer, "An ultrasonic fiber-optic hydrophone incorporating a push-pull transducer in a sagnac interferometer", J. Lightwave Technol. , vol. 12, pp. 1696-1700, 1994.

J. A. Bucaro, H. D. Dardy and E. F. Carome, "Optical fiber acoustic sensor", Appl. Opt. , vol. 16, no. 7, pp. 1761-1762, 1977.

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