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A Fabry-Perot fibre optic ultrasonic hydrophone for the simultaneous measurement of temperature and acoustic pressure.

Morris, P*; Hurrell, A*; Shaw, A; Zhang, E*; Beard, P* (2009) A Fabry-Perot fibre optic ultrasonic hydrophone for the simultaneous measurement of temperature and acoustic pressure. J. Acoust. Soc. Am., 125 (6). pp. 3611-3622.

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Abstract

A dual sensing fibre-optic hydrophone that can make simultaneous measurements of acoustic pressure and temperature at the same spatial point has been developed for characterising ultrasound fields and ultrasound induced heating. The transduction mechanism is based upon the detection of acoustically and thermally induced thickness changes in a polymer film Fabry-Perot interferometer deposited at the tip of a single mode optical fibre.
The sensor provides a peak noise equivalent pressure of 16 kPa (over a 25 MHz measurement bandwidth), an acoustic bandwidth of 50 MHz and an optically defined element size of 10 µm. As well as measuring acoustic pressure, temperature changes up to 70 ºC can be measured, with a resolution of 0.335 ºC. To evaluate the ability of the sensor to characterise ultrasound-induced heating, measurements were made at the focus of a HIFU field in a tissue mimicking phantom. These measurements showed that the sensor does not introduce significant errors due to viscoelastic self-heating, is sufficiently robust to withstand HIFU fields at clinical intensity levels and that acoustic waveforms can be acquired whilst simultaneously monitoring the induced temperature rise. These attributes, along with small physical size (OD ~150 µm) and flexibility, immunity to EMI and low cost, suggest that this type of hydrophone may provide a practical alternative to piezoelectric based hydrophone technology.

Item Type: Article
Keywords: ultraound, fibre-optic hydrophone, hydrophone, temperature
Subjects: Acoustics
Acoustics > Ultrasound
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4446

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