Using a heterodyne vibrometer in combination with pulse excitation for primary calibration of ultrasonic hydrophones in amplitude and phase. (14th June 2017)

• Record Type: Journal Article
• Authors: Weber, Martin; Wilkens, Volker
• Is Part Of: Metrologia. Volume 54:Number 4(2017:Aug.)
• Page Start: 432
• Page End: 444
• Publication Date: 2017-06-14
• Subjects: calibration -- vibrometer -- hydrophone -- ultrasonics; Weights and measures -- Periodicals; Weights and Measures -- Periodicals; 530.805
• DOI: 10.1088/1681-7575/aa72ba
• Languages: English
• ISSNs: 0026-1394

Abstract

Abstract: A high-frequency vibrometer was used with ultrasonic pulse excitation in order to perform a primary hydrophone calibration. This approach enables the simultaneous characterization of the amplitude and phase transfer characteristic of ultrasonic hydrophones. The method allows a high frequency resolution in a considerably short time for the measurement. Furthermore, the uncertainty contributions of this approach were investigated and quantified. A membrane hydrophone was calibrated and the uncertainty budget for this measurement was determined. The calibration results are presented up to 70 MHz . The measurement results show good agreement with the results obtained by sinusoidal burst excitation through the use of the vibrometer and by a homodyne laser interferometer, with RMS deviation of approximately 3 % –4% in the frequency range from 1 to 60 MHz . Further hydrophones were characterized up to 100 MHz with this procedure to demonstrate the suitability for very high frequency calibration.