MULTI-SPIRAL COIL AND EMAT TRANSMITTER AND EMAT RECEIVER AND EMAT TRANCEIVER USING THEREOF

摘要

PURPOSE: A multi-spiral coil, an EMAT transmitter, an EMAT receiver, and an EMAT transmitter-receiver using the same are provided to variously change the amount of coil legs. CONSTITUTION: An EMAT transmitter using a multi-spiral coil comprises a multi-spiral coil(100), a function generator, a phase shifter, a first power amplifier, and a second power amplifier. The multi-spiral performs an ultrasonic wave transmission function. The function generator generates a voltage signal for controlling ultrasonic frequency and waveform. The phase shifter outputs the generated voltage signal. The first power amplifier is connected to one side of the multi-spiral coil. The voltage signal is inputted to the input terminal of the second power amplifier, and an output terminal is connected to the other side of the multi-spiral coil.