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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Characterization of high-frequency, single-element focused transducers with wire target and hydrophone
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Characterization of high-frequency, single-element focused transducers with wire target and hydrophone

机译：带有线靶和水听器的高频单元件聚焦换能器的特性

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摘要

In this paper, a wire-target technique was used for lateral beam profile measurements for a single-element, focused transducers in the very high-frequency range (35-60 MHz). Two wire targets made from 9-cm long tungsten wires with diameters of 8 /spl mu/m and 20 /spl mu/m were used as the pulse-echo targets to measure the lateral beam profiles at the focal plane of two single-element, focused transducers, a spherically focused 40 MHz transducer and a lens-focused in-house lithium niobate (LiNbO/sub 3/) 60 MHz transducer. For comparison, measurements on the same transducers were performed by three small-aperture hydrophones with geometrical diameters varying from 37 /spl mu/m to 150 /spl mu/m. Tomographic reconstruction of the acoustic field from the spherically focused transducer also was conducted. Results obtained with the wire-target technique are comparable to those obtained with small-aperture hydrophones in characterizing lateral radiation patterns of a single-element, focused transducer in the high-frequency range (35-60 MHz). However, the wire-target method may overestimate pulse length because of the additional attenuation caused by the return path. Compared to small-aperture hydrophones, the wire-target technique is simpler and more cost effective. Its major advantage, however, is in the frequency range above 100 MHz in which commercial hydrophones are not yet available.
机译：在本文中，线靶技术用于在非常高的频率范围（35-60 MHz）中对单元素聚焦换能器进行侧向光束轮廓测量。使用由直径为8 / spl mu / m和20 / spl mu / m的9厘米长的钨丝制成的两个线靶作为脉冲回波靶，以测量两个单元素焦平面处的横向光束轮廓，聚焦传感器，球形聚焦40 MHz传感器和透镜聚焦室内铌酸锂（LiNbO / sub 3 /）60 MHz传感器。为了比较，通过三个小孔径水听器对相同的换能器进行测量，其几何直径从37 / spl mu / m到150 / spl mu / m不等。还对球形聚焦换能器的声场进行了层析成像重建。通过线靶技术获得的结果在表征高频（35-60 MHz）范围内的单元件聚焦换能器的横向辐射方向图方面与小孔径水听器获得的结果相当。但是，由于返回路径引起的额外衰减，线靶方法可能会高估脉冲长度。与小孔径水听器相比，线靶技术更简单且更具成本效益。但是，它的主要优点是在100 MHz以上的频率范围内，尚无商用水听器可用。

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