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 $\sim 60.76\mathrm{\mu m}$ has an excellent fringe visibility of up to $\sim 20\mathrm{dB}$, and the fringe visibility is still good when the cavity length extends up to $\sim 1031.07\mathrm{\mu m}$. The measured wavelength-temperature sensitivity of $0.000858\mathrm{nm}/°\mathrm{C}$ 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 $65.4\mathrm{mV}/\mathrm{MPa}$ over a 2.5 MHz measurement bandwidth.

© 2012 Optical Society of America

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