Rajagopal, S;
Sainsbury, T;
Treeby, BE;
Cox, BT;
(2017)
Laser Generated Ultrasound Sources Using Polymer Nanocomposites for High Frequency Metrology.
In:
Proceedings of the 2017 IEEE International Ultrasonics Symposium (IUS).
IEEE: Washington, DC, USA.
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Abstract
Accurate characterization of ultrasound fields generated by diagnostic and therapeutic transducers is critical for patient safety. This requires hydrophones calibrated to a traceable standard and currently the upper calibration frequency range available to the user community is limited to a frequency of 40 MHz. However, the increasing use of high frequencies for both imaging and therapy necessitates calibrations to frequencies well beyond this range. For this to be possible, a source of high amplitude, broadband, quasi-planar and stable ultrasound fields is required. This is difficult to achieve using conventional piezoelectric sources, but laser generated ultrasound is a promising technique in this regard. In this study, various polymer-carbon nanotube nanocomposites (PNC) were fabricated and tested for their suitability for such an application by varying the polymer type, carbon nanotubes weight content in the polymer, and PNC thickness. A broadband hydrophone was used to measure the peak pressure and bandwidth of the laser generated ultrasound pulse. Peak-positive pressures of up to 8 MPa and -6dB bandwidths of up to 40 MHz were recorded. There is a nonlinear dependence of the peak pressure on the laser fluence and the bandwidth scales inversely proportionally to the peak pressure. The high-pressure plane waves generated from this preliminary investigation has demonstrated that laser generated ultrasound sources are a promising technique for high frequency calibration of hydrophones.
| Type: | Proceedings paper |
|---|---|
| Title: | Laser Generated Ultrasound Sources Using Polymer Nanocomposites for High Frequency Metrology |
| Event: | IEEE International Ultrasonics Symposium (IUS) |
| Location: | Washington, DC |
| Dates: | 06 September 2017 - 09 September 2017 |
| ISBN-13: | 978-1-5386-3384-7 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/ULTSYM.2017.8092019 |
| Publisher version: | http://dx.doi.org/10.1109/ULTSYM.2017.8092019 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Technology, Physical Sciences, Engineering, Electrical & Electronic, Physics, Applied, Engineering, Physics, FUNCTIONALIZATION, Polymers, Ultrasonic imaging, Measurement by laser beam, Sonar equipment, Lasers, Optical pulses, Nanocomposites |
| 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/10052613 |
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