Aytac Kipergil, Esra;
Martin, Eleanor;
Mathews, Sunish;
Papakonstantinou, Ioannis;
Alles, Erwin;
Desjardins, Adrien;
(2023)
Fibre-Optic Hydrophone For Detection of High-Intensity Ultrasound Waves.
Optics Letters
, 48
(10)
pp. 2615-2618.
10.1364/ol.488862.
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Abstract
Fibre-optic hydrophones (FOHs) are widely used to detect high-intensity focused ultrasound (HIFU) fields. The most common type consists of an uncoated singlemode fibre with a perpendicularly cleaved end face. The main disadvantage of these hydrophones is their low signal-to-noise ratio (SNR). To increase the SNR, signal averaging is performed, but the associated increased acquisition times hinder ultrasound field scans. In this study, with a view to increase SNR whilst withstanding HIFU pressures, the bare FOH paradigm is extended to include a partially-reflective coating on the fibre end face. Here, a numerical model based on the general transfer-matrix method was implemented. Based on the simulation results, a single-layer, 172 nm TiO2-coated FOH was fabricated. The frequency range of the hydrophone was verified from 1 to 30 MHz. The SNR of the acoustic measurement with the coated sensor was 21 dB higher than of the uncoated one. The coated sensor successfully withstood a peak-positive pressure of 35 MPa for 6000 pulses.
| Type: | Article |
|---|---|
| Title: | Fibre-Optic Hydrophone For Detection of High-Intensity Ultrasound Waves |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1364/ol.488862 |
| Publisher version: | https://doi.org/10.1364/OL.488862 |
| Language: | English |
| Additional information: | Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the a |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10168863 |
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