Bakaric, Marina;
Ogunlade, Olumide;
Miloro, Piero;
Zeqiri, Bajram;
Cox, Benjamin T;
Treeby, Bradley E;
(2023)
Characterisation of hydrophone sensitivity with temperature using
a broadband laser-generated ultrasound source.
Metrologia
, 60
(5)
, Article 055002. 10.1088/1681-7575/ace3c3.
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Abstract
In this work, we present a novel method for characterising the relative variation in hydrophone sensitivity with temperature, addressing a key aspect of measurements in the field of ultrasound metrology. Our study focused on a selection of miniature ultrasonic hydrophones commonly used in medical applications. The method is based on using water as a temperature-sensitive laser-generated ultrasound (LGUS) source for calibration, allowing for flexible characterisation across a wide temperature range. The measurements were performed using both the LGUS method and the established self-reciprocity method. Our results demonstrate good agreement within 5% between the two methods, validating the effectiveness of the LGUS approach. We found that the sensitivity of the tested hydrophones exhibited low temperature dependence less than −0.2% per ∘C within the studied temperature range from 17 ∘C up to 50 ∘C. The presented LGUS method offers greater flexibility than current approaches as it allows for characterisation of membrane hydrophones with small element sizes and non-electrical transducers. By combining the relative sensitivity variation obtained through the LGUS method with the standard calibration at room temperature, absolute values of hydrophone sensitivity can be determined. The expanded uncertainty of our measurements, which was evaluated at temperature intervals of 8 ∘C, was determined to be on average 10%. Our work provides valuable insights into the temperature dependence of hydrophone sensitivity and lays the foundation for further investigations in this area. The LGUS method holds promise for future enhancements, such as increased bandwidth of the LGUS source and frequency domain analysis, to explore the frequency dependency of sensitivity variation with temperature.
| Type: | Article |
|---|---|
| Title: | Characterisation of hydrophone sensitivity with temperature using a broadband laser-generated ultrasound source |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1681-7575/ace3c3 |
| Publisher version: | https://doi.org/10.1088/1681-7575/ace3c3 |
| Language: | English |
| Additional information: | Copyright © 2023 The Author(s). Published on behalf of BIPM by IOP Publishing Ltd. Original Content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence, https://creativecommons.org/licenses/by/4.0/. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| Keywords: | Calibration, hydrophone, laser generated ultrasound, metrology, photoacoustics, sensitivity, temperature. |
| 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/10172151 |
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