| 摘要 |
PROBLEM TO BE SOLVED: To enable the inspection up to a remote distance so as to be capable of reducing detection errors. SOLUTION: A nondestructive inspection apparatus is equipped with an M-system signal generator 3, the transmitter-receiver 2 attached to a pipe 1 to be subjected to nondestructive inspection to transmit the signal outputted from the M-system signal generator into the pipe 1 to receive the signal of the reflected wave from the discontinuous place of the pipe 1, and a correlation detector 10 for detecting the discontinuous place of the pipe 1 by the correlational processing of the receiving signal received by the transmitter- receiver 2 and the same M-system signal of the M-system signal generator 3. With this constitution, the discontinuous place can be detected by transmitting the M-system signal (spectrum diffusing signal) and performing correlational processing by using the same spectrum diffusing signal being the reflection signal of the pipe 1, the measuring error of a detection place can be improved, and an S/N ratio can be also enhanced and the measurement up to a remote distance is enabled. |
