用于超声换能器的无源材料的高频特性。
High frequency properties of passive materials for ultrasonic transducers.
作者信息
Wang H, Ritter T, Cao W, Shung K K
机构信息
NIH Resource Center for Medical Ultrasonic Transducer Technology, Pennsylvania State University, University Park, PA 16802, USA.
出版信息
IEEE Trans Ultrason Ferroelectr Freq Control. 2001 Jan;48(1):78-84. doi: 10.1109/58.895911.
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.
已使用超声光谱法在室温下、25至65兆赫的频率范围内测量了用于超声换能器的无源材料的声学特性。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的体积分数单调增加，这与德纳维模型一致。然而，衰减在颗粒填料体积分数为7%至9%之间达到峰值。为作比较，还制备并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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