基于负载阻抗激励的换能器串联调谐匹配设计

Series Tuning Matching Design Based on Transducer Load Impedance Excitation

声换能器是由电子振荡器产生电信号激发换能器产生机械振动,将声能转变为电能的传感器件。换能器的串联调谐匹配设计是实现换能器频谱分析、数据记录或信号源产生的关键技术。提出一种基于负载阻抗宽带激励的换能器串联调谐匹配设计方法,系统方案设计包括通用的数据采集系统、声学基阵、收发转换和功率放大器以及模拟信号预处理机,声学基阵由4个换能器并联组成,实现电声、声电转换,当一个电信号送到基阵两端,基阵根据电信号振荡产生相应的声信号,通过DSP控制D/A转换器进行数/模转换,输出多路回波信号到功率放大器,引入阻抗匹配与功率激励方案,提高换能器回波微弱差异信息的能量增益,去除检测仪电路中耦合噪声,提高测定目标的方位能力。实验结果表明,该系统设计方案提高换能器回波微弱差异信息的能量增益,避免了换能器接收信号产生调谐失真,有效实现对水声信号的采集和回波接收。

The acoustic transducer is generated by an electronic oscillator signal excitation transducer to generate mechanical vibration, acoustic energy into electric energy of sensor. The transducer series tuned matching design is the key technology to realize the transducer frequency spectrum analysis, data recording or generated by the signal source. Put forward a series tuned matching design method based on the transducer load impedance broadband excitation, system design includes the universal data acquisition system, acoustic array, a transmitting receiving conversion and power amplifier and analog signal pretreatment, acoustic array is composed of 4 acoustic transducer to realize the parallel composition, electro acoustic, acoustic electric transition, when a signal sent to the array at both ends, the array according to the electrical oscillations corresponding sound signal, A / D conversion through DSP control of D/A converter, the output of multi-channel echo signal to the power amplifier, impedance matching and power incentive scheme is introduced, it can improve the weak difference transducer echo information energy gain, remove the noise coupling circuit tester to improve the ability of target,determination of the range of. The experimental results show that the design scheme of the system, improve the transducer echo weak difference information energy gain, to avoid the transducer signal generated tuning distortion, the underwater acoustic signal acquisition and echo receiver is obtained effectively.