激光反射全息技术在超声换能器近场测量中的应用

研究了基于光学反射层析法的超声换能器近场测量方法。介绍了激光反射层析法测量超声场声压分布的原理,建立了一套实验测量系统,利用激光测振仪完成了对一多基元平面活塞换能器近场声压的测量,得到了该换能器辐射面附近声压的幅度和相位分布。使用探针式水听器对相同位置处的声压进行了直接测量,验证了激光层析法测量结果的正确性;声场反演结果进一步表明使用激光反射层析法适用于对换能器辐射面声压分布和阵元工作状况进行预报。 

The application of laser reflective tomography in near-field measurements of ultrasonic transducers

Based on Laser Reflective Tomography(LRT),the measurement method in near fields of ultrasonic transducers was investigated.The principle of LRT in measuring the distribution of ultrasonic fields was introduced and an experiment system was set up.Acoustic pressure of a multiple element piston transducer was measured using a laser vibrometer,and its distribution in amplitude and phase was obtained.The acoustic pressure in the same region was measured using a needle hydrophone,so the results from the LRT method were validated.Furthermore,through the reconstruction of acoustic fields,it indicated that LRT method was suitable for predicting distribution on transducers' surface and conditions of active elements.