激光光束检测圆对称超声换能器焦点声压的可行性  

Feasibility of Circular Symmetric Ultrasonic Transducer Focus Sound Pressure Detection by Laser Beam

作　　者：王华[1] 

机构地区：[1]重庆医科大学生物医学工程学院,重庆400016

出　　处：《激光杂志》2014年第9期103-105,共3页Laser Journal

基　　金：重大仪器专项81127901;国家自然科学基金项目11274404;国家重大科学仪器设备开发专项2013YQ03062906

摘　　要：根据Raman and Nath理论,光在声场中传播可认为是在多层薄光栅中传播,而薄光栅的参数则由光栅平面内的声场分布决定。本文通过圆对称聚焦换能器在焦平面附近的声场分布,得到光束的偏转角与换能器焦点声压的关系。通过测量光束偏转距离得到换能器焦点声压。虽然本文的声压与偏转角的关系是基于理想超声聚焦换能器的线性理论,但通过激光检测声压与光纤水听器测量的结果,表明该方法可用于检测较高的焦点声压检测。According to the Raman and Nath theory, the light propagation in the acoustic field can be considered in multilayer thin grating, and thin grating parameters are determined by the acoustic field distribution of plane grat-ing. Through the acoustic field distribution of the circular symmetry focused transducer in the vicinity of the focal plane, the relationship between the focus sound pressure of transducer and beam deflection angle was gotten. Then focus sound pressure of transducer was gotten by measuring beam deflection distance. Although the relationship be-tween the sound pressure and the deflection angle is based on the idea linear theory of ultrasonic focusing transducer in this paper, compared to the detection results of optical fiber hydrophone, it was showed that it was feasible for the method to detect the higher focus sound pressure.

关 键 词：RAMAN and Nath理论 焦平面声场分布 焦点声压 激光光束 偏转距离 

分 类 号：TN244.8[电子电信—物理电子学] N33[自然科学总论]