Abstract
In the industrial fields, many high temperature structures that require a non-destructive inspection exist. However, there are currently few sensors that can carry out non-destructive testing in a high temperature environment. In particular, the ultrasonic sensor is normally not used at over 50 degrees Celsius. Also, a special sensor for high temperature is currently available, but there are various constraints; it has not yet reached a level that is useful in industry. Therefore, we have been developing a new sensor system using a long waveguide which can transmit an ultrasonic wave from a long distance. Especially, this study focuses on applying the developed technique to a pipe which is used in a nuclear power plant. Therefore, the best rectangular-shaped waveguide was studied and attempted to be wound around a pipe to be driven by an acoustic source of a guide wave. Finally, the L (0, 2) and T (0, 1)-mode guide waves were successfully detected by optimizing the shape of the opposite edge of the rectangular-shaped waveguide that could detect the reflected signal from an artificial defect machined into a test pipe.
Highlights
The increasing demand to improve the performance for reducing inspection time, increasing reliability and extending the life of structures such as nuclear power plants, and petroleum pipeline requires the use of excellent materials and structures [1]-[5]
In the case of the T (0, 1)-mode, the transit time was computed by adding the transit time into the two waveguides, which were used for the transmitter and the receiver, and the transit time between the transmitter-waveguide and the receiver-waveguide by the T (0, 1)mode guide wave
The results probably indicate that the T (0, 1)-mode guide wave typically travels in the subsurface as a general nature and not on the surface of a pipe
Summary
The increasing demand to improve the performance for reducing inspection time, increasing reliability and extending the life of structures such as nuclear power plants, and petroleum pipeline requires the use of excellent materials and structures [1]-[5]. The ultrasonic sensor is widely used in industry as a sensing system for nondestructive inspection. (2015) Pipe Inspection System by Guide Wave Using a Long Distance Waveguide. Tittmann [9] and other researchers [10] have been developing a sensing system which can transmit and receive an ultrasonic wave that can travel a long distance by using a long waveguide. This means that an ultrasonic sensor could be driven at atmosphere temperature. The method to inspect a pipe by using a long waveguide is described
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