We report a nondestructive method to measure the pipe wall-thinning (PWT) remotely using microwaves. A microwave vector network analyzer (VNA) and a self-designed transmitting and receiving (T&R) coaxial-line sensor are employed in the experi ment to generate microwave signals propagating in the metal pipe where the frequency was swept from 14.08 to 14.12 GHz. A brass pipe with inner diameter of 17.03 mm, 1.0 mm wall thickness, 2.0 m length, and connected respectively with 9 joints having the lengths of 17...
英字タイトル:
Remote Detection and High Precision Evaluation of WallThinning Volume in a Metal Pipe

Quantitative evaluation of small cracks in stainless steel under water which was use to simulate the environment of u nclear reactor was demonstrated. The crack depth was evaluated by the means of the microwave dual frequency technique , and the crack closure stress was estimated based on the compliance technique. The cracks were detected significant ly with larger closure stress and the effect of the closure stress to the evaluation of crack depth was investigated....
英字タイトル:
Nondestructive Evaluation of Cracks under Water by Microwaves

Pipe wall thinning was evaluated quantitatively by using time domain measurement of Position of pipe wall thinning was evaluated quantitatively by using time domain measurement of microwaves, and the influence of the measurement sensitivity due to the frequency band of microwaves was investigated. Microwave signals having different frequency bands of 10MHz to 40GHz and 10MHz to 67GHz were transmitted from the terminal o f a straight line copper pipe, and the change in the response of the reflected signals ...
英字タイトル:
Frequency Dependence in the Measurement of Pipe Wall Thinning Using Time-Domain Microwave Testing