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The vibration measurement of a structure requires considerable labor for installing not a few signal cables in the structure, and it is difficult to deal quickly with the unexpected change of circumst...ances like the change of a typhoon path. It is obvious that cable-less installation of a measurement sensor, such as an accelerometer, has a lot of advantages. There are few reports about application of the cable-less measurement to a transmission tower, and so the reliability of measured data under a high electromagnetic field or a strong wind by a cable-less measurement system is unknown. The authors performed a vibration test of a transmission tower of 500KV using cable-less measurement systems and made comparisons of the signals with the wired signals, focusing on a wave shape, standard deviation and frequency analysis. Although some collateral conditions, such as measurement range of about 200m and 10Hz-low-pass-filtering, are required, it is confirmed that the present transmitter for the cable-less measurement has almost same quality as the wired measurement.show more
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jaud013_p033