Signal Acquisition Technology Study Of Electromagnetic Wave Propagation Resistivity Tool Of LWD

Logging While Drilling is the advanced logging technology that has been developedspeedily，Electromagnetic Wave Propagation Resistivity of LWD as one of the loggingtechnologies which based on the conductivity of formation has been widely applied，especially it suits for all kinds of drilling mud，can get different depth of investigation andmore logging curves．This paper makes Wave Propagation Resistivity Logging Tool which has fourtransmitters and two receivers as object of study．By surveying patents and literature at homeand abroad，and400KHz&2MHz frequency signal theoretical research，the text design asignal acquisition system that derived from digital phase sensitive detection technology． Inorder to improve the measurement precision and digitization of the system，we establish thecircuit with the24Bit Analog-to-Digital Convertor ADS1278and digital signalprocessor TMS320F2812，combined high-speed radication arithmetic with DPSD arithmeticdesign，so the operation has been simplified，the measuring accuracy of the signal acquisitionsystem has been improved greatly．Being verified，the scheme of acquisition Electromagnetic Wave Propagation signalderived from DPSD is practical，it’s also a reference for the development of laterElectromagnetic Wave Propagation Resistivity Logging Tool．...