Design of transmitting circuit for Micro-Resistivity Imaging Logging tool

As one of the leading logging technologies, Micro-Resistivity Imaging Logging has gone through the most significant development since the 80´s of last century. Compared the traditional Electrical Imaging Logging, Micro-Resistivity Imaging Logging technology is much more challenging for large data transmission and complex timing control. In this paper, an efficient sinusoidal wave transmitter based on PWM control is proposed. PIC microprocessor is used for master control chip of the transmitting circuit. Through half bridge amplification and low-pass filtering, the PWM signal is sent out by transformer as the driving source. The proposed transmitting circuit has been successfully applied and proved to be effective in practical logging instrument.