| Zugriffsnummer | 35882 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Robust spot-poled membrane hydrophones for measurement of large amplitude pressure waveforms generated by high intensity therapeutic ultrasonic transducers |
| Autor(in); Institution |
Wilkens, Volker; 1.6, Schall, PTB-Braunschweig
Sonntag, Sven; Gesellschaft für Angewandte Medizinische Physik und Technik, Merseburg, GERMANY
Georg, Olga; 1.6, Schall, PTB-Braunschweig
|
| Quelle/Jahr | The Journal of the Acoustical Society of America: 139 (2016), 3, 1319 - 1332 |
| ISSN | 0001-4966 (PRINT) ; 1520-8524 (ONLINE) |
| DOI | |
| Verlag | Melville, NY: AIP |
| Klassifikationscode | PACS: 43.35.+d ; PACS: 43.38.+n ; PACS: 43.58.+z |
| Freie Schlagworte | High intensity therapeutic ultrasound ; Exposimetry ; Hydrophones |
| Zusammenfassung | The output characterization of medical high intensity therapeutic ultrasonic devices poses several challenges for the hydrophones to be used for pressure measurements. Regular spot-poled membrane hydrophones, in principle, meet some of these features and were used to detect large amplitude ultrasonic fields to investigate their applicability. Cavitation in water was the limiting effect causing damage to the electrodes and membrane. A new hydrophone design comprising a steel foil front protection layer has been developed, manufactured, characterized, tested, and optimized. The latest prototypes additionally incorporate a low absorption and acoustic impedance matched backing, and could be used for maximum peak rarefactional and peak compressional pressure measurements of 15 MPa and 75 MPa, respectively, at 1.06 MHz driving frequency. Axial and lateral beam profiles were measured also for a higher driving frequency of 3.32 MHz to demonstrate the applicability for output beam characterization at the focal region at clinical levels. The experimental results were compared with results of numerical nonlinear sound field simulations and good agreement was found if detection bandwidth and spatial averaging were taken into account. |
Zitierung
Wilkens, V., Sonntag, S., & Georg, O. (2016). Robust spot-poled membrane hydrophones for measurement of large amplitude pressure waveforms generated by high intensity therapeutic ultrasonic transducers. The Journal of the Acoustical Society of America, 139(3), 1319–1332. https://doi.org/10.1121/1.4944693