Pulsed eddy current detection system and method for defects of small-pipe-diameter pipeline

Disclosed is a pulsed eddy current detection system and method for defects of a small-pipe-diameter pipeline. The pulsed eddy current detection system is provided with a direct-current power supply, apulse signal generator, a power amplifier, a sensor, a filtering unit, a data processing unit, an oscillographic unit and a computer which are sequentially connected in series. The sensor comprises an exciting coil and a receiving coil, wherein the exciting coil is connected with the output end of the sensor pulse signal generator and used for generating an exciting magnetic field on the detectedpipeline, and the receiving coil is connected with the input end of the sensor filtering unit and used for receiving an eddy current magnetic field generated by a detected test piece under the actionof the exciting magnetic field. The sensor computer is further connected with the sensor pulse signal generator and used for controlling the output frequency, amplitude and duty ratio of the pulse signal generator. The sensor