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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >High frequency properties of passive materials for ultrasonic transducers
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High frequency properties of passive materials for ultrasonic transducers

机译：超声换能器无源材料的高频特性

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摘要

The acoustic properties of passive materials for ultrasonic transducers have been measured at room temperature in the frequency range from 25 to 65 MHz using ultrasonic spectroscopy. These materials include alumina/EPO-TEK 301 composites and tungsten/EPO-TEK 301 composites. Experimental results showed that the acoustic impedance of the composites monotonically increased with the volume fraction of the particle filler, which is in agreement with the Denavey model. The attenuation, however, peaked between 7 and 9% volume fraction of particle filler. For comparison, several other passive materials were also fabricated and measured. The results suggest that materials that possess a higher attenuation also appear to have a larger velocity dispersion.
机译：超声换能器的无源材料的声学特性已在室温下使用超声光谱法在25至65 MHz的频率范围内进行了测量。这些材料包括氧化铝/ EPO-TEK 301复合材料和钨/ EPO-TEK 301复合材料。实验结果表明，复合材料的声阻抗随颗粒填料体积分数的增加而单调增加，这与Denavy模型相吻合。然而，衰减在颗粒填料的体积分数的7％至9％之间达到峰值。为了比较，还制造和测量了其他几种无源材料。结果表明，具有较高衰减的材料似乎也具有较大的速度色散。

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