相控阵多普勒测流仪发射机电路设计

Design of transmitter circuit of phased-array doppler current profiler

在相控阵多普勒测流仪系统中,发射机是不可或缺的一部分,直接影响到电信号转化为声信号的效率和声信号在水中的传输距离。传统的水下声纳发射机一般采用C类功率放大器,其存在效率低、体积大、功率低及易损坏等缺陷,针对以上出现的问题,开展了对发射机原理及技术指标要求的分析,结合现代音响功放的经验与设计方法,将数字音频功率放大技术应用到水声发射机中,设计了一种高稳定性、高效率的发射机电路,使相控阵换能器与功率放大电路的阻抗得到了很好匹配。实验调试结果表明,该设计达到了发射机功率输出最大化目的,提高了相控阵多普勒测流仪整体性能,能够满足相控阵多普勒测流仪产品化要求。

The transmitter is an essential part of the phased-array Doppler current profiler, which directly affects the power conversion efficiency and transmission distance of the acoustic signals in the water. Class-C power amplifier is often used by the traditional transmitter, which has some shortages such as low efficiency, large size, low power output and instability. Aiming at the above problems, the transmitter principle and technical requirements were investigated. Combined with the design methods and the experience of morden audio amplifier, the integrated digital audio power amplifier technology was applied to the underwater acoustic transmitter. A new design was presented to enhance the stability and efficiency of transmitter circuit, the better impedance matching between power amplifier and transducers was obtained. The experimental results indicate that the transmitter can achieve the purpose of the max power output, improve the overall performance and meet the product requirements.