Development of Signal Detection in Casing Damage Tester Based on Remote Field Eddy Current Method

The signal feature in remote field eddy current(RFEC) test is analyzed and a signal detection system based on DPSD algorithm for RFEC test is given.The hardware structure and design of algorithm met the required measurement precision is presented by studying the error module of the testing system.Experimental results show that the system performs well in the signal amplitude and phase extraction to pass the way for later defect recognition and software imaging.