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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Wideband spherically focused PVDF acoustic sources for calibration of ultrasound hydrophone probes
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Wideband spherically focused PVDF acoustic sources for calibration of ultrasound hydrophone probes

机译：宽带球形聚焦PVDF声源，用于超声水听器探头的校准

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摘要

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 /spl mu/m 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 0.28 in (6.60 mm). The active diameter of the third source used was 25 mm, and it had an ROC of 254 mm and an f number of 10. The use of a focused element minimized frequency-dependent diffraction effects, resulting in a smooth variation of acoustic pressure at the focus from 1 to 40 MHz. Also, using a focused PVDF source permitted calibrations above 20 MHz without resorting to harmonic generation via nonlinear propagation.
机译：为了校准水听器，已经开发了几种宽带源。所描述的特定配置旨在在1到40 MHz的频率范围内校准水听器。所有设备都使用25 / splμ/ m的PVDF薄膜粘合到匹配的背衬上。其中两个的曲率半径（ROC）为25.4和127 mm，f值分别为3.8和19。它们的有源元件直径为0.28英寸（6.60毫米）。所使用的第三个声源的有效直径为25 mm，ROC为254 mm，f值为10。使用聚焦元件可最大程度地减少频率相关的衍射效应，从而在声源处产生平稳的声压变化。从1到40 MHz聚焦。而且，使用聚焦的PVDF源可以进行20 MHz以上的校准，而无需借助非线性传播产生谐波。

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