Patent ID: 8091427

Claim:
A nondestructive inspection apparatus comprising: a pair of guided wave inspection devices connected to a pair of guided wave sensors which are disposed on an outer surface of a piping, each of said devices exciting an elastic wave into the piping to propagate a guided wave, each of said devices receiving the guided wave propagating through the piping; an inspection-result storage device for storing the guided wave received by said guided wave inspection device as a digitized signal of the received wave; and an inspection-result diagnostic device for, by taking an added value or differential value of back-and-forth propagation time of receive wave which exceeds a predetermined threshold value in a signal of each received wave acquired by transmitting a guided wave by use of said pair of guided wave inspection devices into the piping by use of said pair of guided wave inspection devices, performing arithmetic processing of judging whether or not a signal associated with a defect exists.