| Zugriffsnummer | 45890 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | A comparison of different calibration techniques for hydrophones used in medical ultrasonic field measurement |
| Autor(in); Institution |
Weber, Martin; 1.6, Schall, PTB-Braunschweig
Wilkens, Volker; 1.6, Schall, PTB-Braunschweig
|
| Quelle/Jahr | IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control: 68 (2021), 5, 1919 - 1929 |
| ISSN | 1525-8955 (ONLINE) ; 0885-3010 (PRINT) |
| DOI | |
| Verlag | New York: NY: IEEE |
| Klassifikationscode | PACS: 43.35.+d |
| Freie Schlagworte | Hydrophone calibration ; interferometrical calibration ; time-delay spectrometry ; ultrasound exposimetry |
| Zusammenfassung | The acoustic output characterization of medical ultrasonic equipment requires regular calibration of the hydrophones used to ensure the reliability of measurements. Such hydrophone calibration is offered as a service by several institutions. Various calibration techniques using a variety of ultrasonic excitation pressure waveforms comprising different pressure amplitude ranges and frequency compositions as well as different reference measurement systems have been proposed and applied over the past decades. Currently, four different setups for hydrophone calibration are available at the Physikalisch-Technische Bundesanstalt (PTB). This internal comparison study addresses the consistency of all four methods including direct primary calibration and substitution calibration using reference hydrophones. The methods apply monofrequency tonebursts and swept tonebursts in the quasi-linear kPa range as well as impulse excitation including nonlinear propagation. In recent years, a new primary calibration setup using a high frequency vibrometer has been implemented at PTB, enabling the characterization of hydrophone frequency responses in modulus and phase and extending the upper frequency limit to up to 100 MHz. For the comparison in the frequency range from 0.5 MHz to 60 MHz, two passive membrane hydrophones with well-known characteristics gained from many years of measurements were used. Another membrane hydrophone with a nominal diameter of 0.2 mm and an integrated preamplifier was applied to address the frequency range up to 100 MHz. The results obtained with the different setups showed good agreement with average rms deviations of 3 % (primary calibrations, 1 MHz to 60 MHz) and 4 % (1 MHz to 100 MHz). The consistency of the implementations was thus verified in this comparison. |
| Themenbereich der Metrologie | Akustik, Ultraschall, Beschleunigung |
Zitierung
Weber, M. & Wilkens, V. (2021). A comparison of different calibration techniques for hydrophones used in medical ultrasonic field measurement. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 68(5), 1919–1929. https://doi.org/10.1109/tuffc.2020.3046751