21 September 1994 Distributed fiber optic acoustic sensor
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The principles of operation of distributed fiber-optic seismoacoustic sensor based on intermode interference in low mode fibers are studied. A model of this sensor for seismo-acoustic vibrations registration was made and tested. This sensor has the following performances: working frequency band is 2 - 40 Hz, transformation coefficient is 1.5 mV(DOT)s2/m at frequency 20 Hz, sensitivity threshold is 1.6(DOT)10-3 m/s2, sensor length is 100 m. Interferometric procedures of signal forming and processing were researched.
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Yuri N. Kulchin, Oleg B. Vitrik, Yuri S. Petrov, Oleg V. Kirichenko, "Distributed fiber optic acoustic sensor", Proc. SPIE 2294, Distributed and Multiplexed Fiber Optic Sensors IV, (21 September 1994); doi: 10.1117/12.187391; https://doi.org/10.1117/12.187391

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