Abstract
Inspection of a pipeline is essential for the safe use of such facilities. A trial sensor using an electromagnetic acoustic transducer (EMAT), which can generate the SH-mode plate wave propagating in the circumferential direction, has been developed to realize this objective. It consists of a circulating electromagnetic induction coil around the pipe and many permanent magnets arranged on the surface of the pipe in the circumferential direction. It is postulated that the intensity of the SH-mode plate wave propagating in the circumferential direction is dependent on any defects in the circumferential direction. A resonance method was then utilized to obtain a stronger received signal. As a result, it was confirmed that the resonance status can be detected. The relationship between the signal intensity and the pipe thickness was then evaluated. It was confirmed that the wall thickness of about 20% can be detected under a static condition. Finally, a moving test has been executed by using an axially traveling device manufactured by trial. The test pipes with different sizes of drilled holes were prepared. The change in the received signal intensity according to different sizes of the drilled holes was successfully detected.
Highlights
The quality monitoring of any materials, any equipment, and any structures is becoming very important for achieving a safe and secure society
It consists of a circulating electromagnetic induction coil around the pipe and many permanent magnets arranged on the surface of the pipe in the circumferential direction
The trial electromagnetic acoustic transducer (EMAT) transmits and receives the Shear Horizontal (SH)-mode plate wave propagating in the circumferential direction to detect the presence or absence of defects in the pipe
Summary
The quality monitoring of any materials, any equipment, and any structures is becoming very important for achieving a safe and secure society. In order to use non-contact sensors, such as an electromagnetic acoustic transducer (EMAT), it is possible to improve the S/N ratio by signal processing as a method of compensating for the low conversion efficiency. A sensor system that transmits and receives the SH-mode plate wave propagating in the circumferential direction of a pipe has been developed. It uses an EMAT to mechanically move the ultrasonic sensor in the axis direction of a pipe without any contact medium It was discussed whether it is possible to detect the presence or absence of any defects in a pipe while mechanically running in the axis direction of a pipe. Development of Synchronous Circumferential Propagating SH-Mode Plate Wave EMAT
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