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Articles by Alan R. Selfridge
Onda Corporation
Featured articles Ellipsoidal hydrophone with improved characteristics Jun. 7, 2023 Abstract A new style of hydrophone is being developed to meet or exceed the new recommendations set forth in the AIUM Acoustic Output Measurement Standard [1] as they apply to ultrasound measurements ... Quantitative 2D and 3D Schlieren Imaging for Acoustic Power and Intensity Measurements Jun.
Wave field visualization using scanned hydrophone measurements | Environmental XPRT
Abstract A simple yet novel method has been developed which is useful for visualizing pressure distributions in acoustic wave fields. The method utilizes the power of contemporary computers to store entire waveforms from the numerous points interrogated in a planar scan. The most useful type of planar scan for the concept is made in the xz plane, as shown in Figure 1. The z-axis typically corresponds to the beam axis of a transducer, and the x-axis is an arbitrary axis normal to it.
Ellipsoidal hydrophone with improved characteristics | Environmental XPRT
Abstract A new style of hydrophone is being developed to meet or exceed the new recommendations set forth in the AIUM Acoustic Output Measurement Standard [1] as they apply to ultrasound measurements for submission to the U.S. FDA.
Wideband Spherically Focused PVDF Acoustic Sources for Calibration of Ultrasound Hydrophone Probes | Environmental XPRT
Abstract Several broadband sources have been developed for the purpose of calibrating hydrophones. The specific configuration described is intended for the calibration of hydrophones in a frequency range of 1 to 40 MHz. All devices used 25 µm film of PVDF bonded to a matched backing. Two had radii of curvatures (ROC) of 25.4 and 127 mm with f numbers of 3.8 and 19, respectively. Their active element diameter was 0.26 in (6.60 mm).
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