| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a system for sensing an abnormality, which sense the abnormality on the basis of the changes of sound without changing the structure of a blasting device itself. SOLUTION: The sound at a monitoring target part of the blasting device is acquired as aural signals by a microphone 2. A signal among the aural signals in a set frequency band preset as the frequency band, in which changes appear when the abnormality as a sensing target occurs, is extracted as an inspection target signal with a bandpass filter 4. The extracted inspection target signal is inputted to a comparator 5. Its output value is compared with a standard output value corresponding to the output value in the set frequency band among the aural signals of the sound generated by the monitoring target part at the normal time. COPYRIGHT: (C)2005,JPO&NCIPI
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