A tip-sensitive fibre-optic Bragg grating ultrasonic hydrophone (TSFBGUH) with high spatial resolution for measuring high-intensity focused ultrasound (HIFU) fields is reported. When measuring a HIFU field, the sensitive axis of the TSFBGUH with a flexible fibre-optic sensor holder should be in parallel with the acoustic axis of the HIFU transducer to ensure the measured ultrasound impinges on the tip of the TSFBGUH. The TSFBGUH system has been established and tested. The experimental results show that the acoustic pressure sensitivity of the TSFBGUH system is about 31.3 mV/MPa within the measurement range of 10 MHz and the noise equivalent pressure is about 10.4 kPa.

References

1. 1)
  - 3. Wang, D.H., Wang, S.J., Jia, P.G.: ‘In-line silica capillary tube all-silica fiber-optic Fabry-Perot interferometric sensor for detecting high intensity focused ultrasound fields’, Opt. Lett., 2012, 37, (11), pp. 2046–2048 (doi: 10.1364/OL.37.002046).
2. 2)
  - 5. Xu, M.G., Reekie, L., Chow, Y.T., Dakin, J.P.: ‘Optical in-fibre grating high pressure sensing’, Electron. Lett., 1993, 29, (4), pp. 398–399 (doi: 10.1049/el:19930267).
3. 3)
  - 12. Shao, Y., Lau, S.T., Dong, X.Y., Zhang, A.P., Chan, H.L.W., Tam, H.Y., He, S.L.: ‘High-frequency ultrasonic hydrophone based on a cladding-etched DBR fiber laser’, IEEE Photonics Technol. Lett., 2008, 20, (8), pp. 548–550 (doi: 10.1109/LPT.2008.918841).
4. 4)
  - 4. Parsons, J.E., Cain, C.A., Fowlkes, J.B.: ‘Cost-effective assembly of a basic fiber-optic hydrophone for measurement of high-amplitude therapeutic ultrasound fields’, J. Acoust. Soc. Am., 2006, 119, (3), pp. 1432–1440 (doi: 10.1121/1.2166708).
5. 5)
  - 13. Rosenthal, A., Razansky, D., Ntziachristos, V.: ‘High-sensitivity compact ultrasonic detector based on a pi-phase-shifted fiber Bragg grating’, Opt. Lett., 2011, 36, (10), pp. 1833–1835 (doi: 10.1364/OL.36.001833).
6. 6)
  - 10. Fomitchov, P., Krishnaswamy, S.: ‘Response of a fiber Bragg grating ultrasonic sensor’, Opt. Eng., 2003, 42, (4), pp. 956–963 (doi: 10.1117/1.1556372).
7. 7)
  - 9. Fisher, N.E., Webb, D.J., Pannell, C.N.: ‘Ultrasonic hydrophone based on short in-fiber Bragg gratings’, Appl. Opt., 1998, 37, (34), pp. 8120–8128 (doi: 10.1364/AO.37.008120).
8. 8)
  - 1. Beard, P.C., Mills, T.N.: ‘Miniature optical fibre ultrasonic hydrophone using a Fabry-Pérot polymer film interferometer’, Electron. Lett., 1997, 33, (8), pp. 801–803 (doi: 10.1049/el:19970545).
9. 9)
  - 2. Wang, D.H., Jia, P.G., Wang, S.J., Zhao, C.L., Zeng, D.P., Wang, H., Li, F.Q.: ‘Tip-sensitive all-silica fiber-optic Fabry-Perot ultrasonic hydrophone for charactering high intensity focused ultrasound fields’, Appl. Phys. Lett., 2013, 103, (4), p. 044102 (doi: 10.1063/1.4816329).
10. 10)
  - 8. Li, Z.X., Pei, L., Dong, B., Ma, C., Wang, A.B.: ‘Analysis of ultrasonic frequency response of surface attached fiber Bragg grating’, Appl. Opt., 2012, 51, (20), pp. 4709–4714 (doi: 10.1364/AO.51.004709).
11. 11)
  - 11. Guan, B.O., Tam, H.Y., Ting, L.S., Chan, H.L.W.: ‘Ultrasonic hydrophone based on distributed Bragg reflector fiber laser’, IEEE Photonics Technol. Lett., 2005, 17, (1), pp. 169–171 (doi: 10.1109/LPT.2004.838141).
12. 12)
  - 6. Wu, Q., Okabe, Y.: ‘Ultrasonic sensor employing two cascaded phase-shifted fiber Bragg gratings suitable for multiplexing’, Opt. Lett., 2012, 37, (16), pp. 3336–3338 (doi: 10.1364/OL.37.003336).
13. 13)
  - 7. Liu, T.Q., Han, M.: ‘Analysis of pi-phase-shifted fiber Bragg gratings for ultrasonic detection’, IEEE Sens. J., 2012, 12, (7), pp. 2368–2373 (doi: 10.1109/JSEN.2012.2189383).

Tip-sensitive fibre-optic Bragg grating ultrasonic hydrophone for measuring high-intensity focused ultrasound fields

References

Related content