Abstract
A monitoring method using a wireless sensor network was developed to lighten the data acquisition workload and reduce the costs for monitoring railway tunnels. A relay method was proposed for transmitting the data over a long distance. The performance of the monitoring system was verified by means of field tests in actual railway tunnels. This paper also describes a data processing method which eliminates the short-term change caused by daily temperature changes in order to utilize the real-time monitoring data for tunnel maintenance. It is found that a low-pass filter is an effective tool for eliminating the short-term change.
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