| 摘要 |
PROBLEM TO BE SOLVED: To detect destruction at any point within almost the entire area of a window pane, without forming a conductive film on the surface of wave guide member of the window pane or the like. SOLUTION: The monitoring device is provided with the wave guide member 1 of the window pane or the like which covers the opening of a building such as a window and guides light into the inside of the member with wall thickness, a light source 2 of, for instance, a semiconductor laser which conducts the light into the wave guide member, and a light detection means 3 of, for instance, a photodiode or a phototransistor which detects the light which has been guided through the wave guide member and arrived from the light source. Depending on the presence of damage of the wave guide member, the amount of the light detected by the light detection means changes. COPYRIGHT: (C)2005,JPO&NCIPI
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