| 摘要 |
A sensor sheet has a substantially rectangular sheet member and a plurality of sensing elements disposed in a predetermined distribution on the sheet member and sense pressure or vibration. The sensor sheet outputting a signal corresponding to load or vibration from a sleeper. A lateral width of the sheet member is set to a minimum length at which the sensing elements exist in a predetermined range when the sleeper moves in a lateral direction. A longitudinal length of the sheet member is set to a minimum length at which the sensing elements exist in a predetermined range corresponding to a trunk part of the sleeper. The sheet member is allowed to be folded at least in the lateral width direction.
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