Concrete utility poles land middle of broadband ultrasonic inspection method based on the macroscopic exploration theory

摘要

PPROBLEM TO BE SOLVED: To provide a method for a person to easily search for and measure cracks in an underground part of an electric pole even if the person has not sufficient knowledge and experiences. PSOLUTION: The ultrasonic search method to search for cracks in an underground part of a concrete electric pole having a hollow part therein includes a step of finding a received wave GSBj/SB(t) by performing a multitude of times of reception at respective survey points, a step of preparing a crack calibration wave Gw(t), a step of correcting differences in the amplitude of GSBj/SB(t), a step of finding a narrow-band spectrum FASBj/SB(f) to find corresponding GASBj/SB(t) and calculating a tSB1/SBvalue each time a distance 1 is inputted, a step of finding new GASBj/SB(t) for analysis by using a CG(1) function, and a step of finding GBSBj/SB(t) by using a filter function. With GBSBnA+1/SB(t) maximally displayed, GBSBj/SBSPnS/SP(t) is comparatively displayed. When an evaluation segment crosses the wave of the GBSBj/SBSPnS/SP(t), it is determined at its measurement point j that cracks exist within the distance 1 or onward. Measurement is performed on whether the cracks exist and on a distance 1 to the cracks with a 1 value gradually increased. PCOPYRIGHT: (C)2008,JPO&INPIT