Fiber-optic hydrophone for detection of high-intensity ultrasound waves

被引：4

作者：

Kipergil, Esra Aytac ^{[1
,2
]}

Martin, Eleanor ^{[1
,2
]}

Mathews, Sunish J. ^{[1
,2
]}

Papakonstinou, Ioannis ^{[3
]}

Alles, Erwin J. ^{[1
,2
]}

Desjardins, Adrien E. ^{[1
,2
]}

机构：

[1] UCL, Dept Med Phys & Biomed Engn, Malet Pl Engn Bldg, London WC1E 6BT, England

[2] UCL, Wellcome EPSRC Ctr Intervent & Surg Sci WEISS, Charles Bell House, 43-45 Foley St, London W1W 7TY, England

[3] UCL, Dept Elect & Elect Engn, Photon Innovat Lab, Roberts Bldg, London WC1E 7JE, England

来源：

OPTICS LETTERS | 2023年 / 48卷 / 10期

基金：

英国惠康基金;

关键词：

CALIBRATION; SENSOR; FIELDS; PROBE;

D O I：

10.1364/OL.488862

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Fiber-optic hydrophones (FOHs) are widely used to detect high-intensity focused ultrasound (HIFU) fields. The most common type consists of an uncoated single-mode fiber 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 increasing SNR while withstanding HIFU pressures, the bare FOH paradigm is extended to include a partially reflective coating on the fiber 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 that of the uncoated one. The coated sensor successfully withstood a peak positive pressure of 35 MPa for 6000 pulses.

引用

页码：2615 / 2618

页数：4

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