超声成像检测系统声波信号激励与处理技术
Acoustic Signal Excitation and Processing Technology in Ultrasonic Imaging Detection System

DOI: 10.12677/JSTA.2020.81001, PP. 1-9

Keywords: 超声波，激励电路，脉冲变压器，信号处理电路，抗干扰能力
Ultrasonic, Excitation Circuit, Pulse Transformer, Signal Processing Circuit, Anti-Interference Ability

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Abstract:

在过程层析成像系统中，投影数据精度直接决定成像分辨率。根据超声成像检测声场的要求，采用高频MAX038芯片作为超声波发射电路的信号发生器；在接收电路前端设计了RC无源滤波预处理电路，并采用高输入电阻的集成运放芯片构成电压跟随器。设计结果表明，超声波激励信号幅值、功率稳定；有效地消除了接收信号中的电磁干扰成分，且避免了在接收电路前端产生的压电电荷泄漏。
In a process tomography system, the accuracy of projection data directly determines the imaging resolution. MAX038 chip with high working frequency is used as the signal generator in the ultra-sonic transmitting circuit, according to the sound field requirements of imaging detection. At the front-end of receiving circuit, a passive RC band-pass filter and a voltage follower with high input resistance integrated op-amp were used. The results show that the transmitted ultrasonic wave amplitude and power are stable; electromagnetic interference in the received signal is effectively eliminated, and piezoelectric charge leakage at the front-end of the receiving circuit is avoided.

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