J4 ›› 2013, Vol. 26 ›› Issue (4): 46-50.doi: 10.3976/j.issn.1002-4026.2013.04.011

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A distributed feedback fiber laser hydrophone with high sensitivity and flat frequency response

 XU Hua, WANG Chang, PENG Gang-Ding, ZHANG Xiao-Lei, WANG Ying-Ying, SUN Zhi-Hui, QI Hai-Feng, SONG Zhi-Qiang, NI Jia-Sheng   

  1. 1. Shandong Provincial Key Laboratory of Fiber Sensing Technology, Laser Institute, Shandong Academyof Sciences, Jinan 250014, China; 2. University of New South Wales, Sydney 2052, Australia
  • Received:2013-03-28 Published:2013-08-20 Online:2013-08-20

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Abstract:

     A distributed feedback (DFB) fiber laser is packaged with a polyurethane spindle structure for acoustic sensing. It is tested in a standing wave tube calibration field. Phase demodulator OPD4000 is employed to precisely measure the phase shift. We obtain the phase sensitivity of -122.6 dB re rad/μPa, i.e. 3.8 nm/MPa at 1 kHz. The frequency response is flat in the range of 10 Hz~10 kHz with the fluctuation of no more than ±9 dB. Its signal and noise ratio (SNR) is equal to standard PZT hydrophone.

Key words: distributed feedback fiber laser hydrophone, frequency response, acoustic sensitivity

CLC Number: 

  • TP212.1

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