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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 11 — Jun. 1, 2012
  • pp: 2046–2048

In-line silica capillary tube all-silica fiber-optic Fabry–Perot interferometric sensor for detecting high intensity focused ultrasound fields

D. H. Wang, S. J. Wang, and P. G. Jia  »View Author Affiliations


Optics Letters, Vol. 37, Issue 11, pp. 2046-2048 (2012)
http://dx.doi.org/10.1364/OL.37.002046


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Abstract

Aiming at detecting high intensity focused ultrasound (HIFU) fields, this letter reports on a novel in-line silica capillary tube all-silica fiber-optic Fabry–Perot (ILSCT-ASFP) interferometric sensor fabricated by splicing a commercially available silica capillary tube to two single-mode fibers. The experimental results show that such a novel ILSCT-ASFP interferometric sensor with a cavity length of 60.76μm has an excellent fringe visibility of up to 20dB, and the fringe visibility is still good when the cavity length extends up to 1031.07μm. The measured wavelength-temperature sensitivity of 0.000858nm/°C shows that the wavelength drift of the fabricated ILSCT-ASFP interferometric sensor towards temperature is extremely low. Meanwhile, the measurement of HIFU fields by this novel sensor is demonstrated, and the experimental results indicate that the signal-to-noise ratio of the sensing system for sensing a 0.93 MHz HIFU field with a pressure of 2.69 MPa in the focus area can reach 42.8 dB. The corresponding noise equivalent pressure is 0.0194 MPa, and the calculated acoustic sensitivity is 65.4mV/MPa over a 2.5 MHz measurement bandwidth.

© 2012 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: June 13, 2011
Revised Manuscript: February 22, 2012
Manuscript Accepted: March 15, 2012
Published: May 30, 2012

Citation
D. H. Wang, S. J. Wang, and P. G. Jia, "In-line silica capillary tube all-silica fiber-optic Fabry–Perot interferometric sensor for detecting high intensity focused ultrasound fields," Opt. Lett. 37, 2046-2048 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-11-2046


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