| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of ultrasonic wave transmitter-receivers in the case of break inspection, etc., of a traveling route by reducing the attenuation of elastic waves in the rout and making the transmission range of the elastic wave long. SOLUTION: An ultrasonic wave transmitter 20 and an ultrasonic wave receiver 30 are provided at one end of a break inspection section A predetermined on a rail 11, and the frequency of an ultrasonic wave emitted from the transmitter 30 is regarded as the resonance frequency of the rail 11 in the case of detecting a break of the rail 11 in such a manner that the receiver 30 receives a reflected wave against the broken surface of a break 12 when the transmitter 20 emits the ultrasonic wave to the rail 11.
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