收发一体激光致声换能器声特性分析

Design of a laser induced sound transceiver sonar transducer

设计并分析一种收发一体激光致声换能器的声学性能.利用旋转抛物面的声学反射特性,获得216.1dB的激光声声源级和0.24°的角度分辨力.通过控制激光参数和击穿蒸馏水获得距离分辨力为4.9mm的激光声信号,推导出该换能器接收波束和发射波束的指向性函数、波束宽度方程和指向性指数表达式.通过理论推导和数值计算,初步证明了该收发一体的激光声换能器在距离分辨力、角度分辨力和声源级3方面具备了作为图像声呐声源的必要条件,在距离分辨力上具有明显的优势.

The design of a laser induced sound transceiver sonar transducer was analyzed. With the reflection charaeteristies of a paraboloid and an angle resolution of 0. 24°, a sound source level of 216. ldB was attained. Laser induced sound with high range resolution of 4.9mm was attained by breaking down distilled water and choosing laser parameters. The transmitting beam directivity function, the receiving beam directivity function, the beamwidth equation, the transmitting beam directivity index and the receiving beam directivity index were deduced. The results of theoretical deduction and numerical calculations showed that the laser induced sound transceiver sonar transducer, as designed, satisfies the necessary conditions of an image sonar transducer in terms of angle resolution, range resolution and sound source levels, and has obvious merits in range resolution.