Phillips P J, von Ramm O T, Swartz J C, Guenther B D
Department of Biomedical Engineering, Duke University, Durham, North Carolina 27706.
J Acoust Soc Am. 1993 Feb;93(2):1182-91. doi: 10.1121/1.405513.
A new optical transducer for the detection of acoustic pressure in the diagnostic ultrasound frequency range is described. This transducer is based on the modulation of an evanescent light field by the incident acoustic energy. Theoretical design considerations are presented for the purpose of developing the most sensitive transducer. Based on these considerations an experimental transducer was constructed. Although less sensitive than predicted this device was capable of transducing ultrasonic pulses with a 1.0-MHz center frequency at diagnostic ultrasound amplitude levels. The techniques developed here are applicable for two-dimensional transduction and may prove a viable alternative to piezoelectric array transducers.
描述了一种用于检测诊断超声频率范围内声压的新型光学换能器。该换能器基于入射声能对倏逝光场的调制。为了开发最灵敏的换能器，给出了理论设计考量。基于这些考量构建了一个实验性换能器。尽管不如预期灵敏，但该装置能够在诊断超声振幅水平下转换中心频率为1.0 MHz的超声脉冲。这里开发的技术适用于二维转换，并且可能证明是压电阵列换能器的一种可行替代方案。
