Lavandier B, Jossinet J, Cathignol D
INSERM, Unité 281, 151 Cours Albert Thomas, Lyon, France.
Ultrasonics. 2000 Sep;38(9):929-36. doi: 10.1016/s0041-624x(00)00029-9.
Acoustic pressure alters local electrical conductivity in tissues and solutions. This work concerns the measurement of electrical conductivity in a liquid which is subjected to an acoustic pressure field created by a focused transducer. Measurements were made with four electrodes positioned in the ultrasonic focal zone, and the signal concerned is referred to as the acousto-electric interaction signal. A solution of sodium chloride in a measurement cell was subjected to ultrasound pressures of upto 1 MPa. It was shown that it is possible to quantitate the acousto-electric interaction signal once the ultrasonic vibration potential due to the Debye effect has been subtracted. The acousto-electric interaction signal was shown to be directly proportional to both the applied acoustic pressure and current. For the measurement cell used in this work, the interaction factor was found to be 5.3 microVmA(-1) MPa(-1).
声压会改变组织和溶液中的局部电导率。这项工作涉及对置于聚焦换能器产生的声压场中的液体的电导率进行测量。测量是通过位于超声聚焦区的四个电极进行的，所涉及的信号被称为声电相互作用信号。测量池中氯化钠溶液承受高达1兆帕的超声压力。结果表明，一旦减去因德拜效应产生的超声振动电势，就可以对声电相互作用信号进行定量。声电相互作用信号与施加的声压和电流均成正比。对于本工作中使用的测量池，发现相互作用因子为5.3微伏毫安⁻¹兆帕⁻¹。
