Design of Excitation Circuit for Adaptive Acoustic Logging Transducer

With the continuously increasing requirements for detection distance and detection accuracy of acoustic logging instruments, the traditional square wave pulse excitation method fails to meet the field needs such as low-frequency excitation. Therefore, a sinusoidal wideband excitation circuit based on push-pull power amplification technology was designed to achieve precise adjustment of the transducer excitation frequency, and a signal amplification and rectification circuit were designed to optimize the sinusoidal excitation signal. In addition, to deal with the influence of the environment such as temperature and pressure on the acoustic logging instrument during downhole operations, a power adaptive adjustment circuit based on proportional-integral-derivative (PID) control was designed to maintain constant excitation energy. The experimental results show that the designed excitation circuit can achieve wideband, high-power, and adaptive sinusoidal excitation. The application of this circuit to acoustic logging instruments can significantly improve the excitation performance, improve the detection distance and resolution of acoustic remote logging instruments, and thus promote the exploration and development of oil and gas fields.