| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly reliable monitoring system that can surely detect a moving of a stationary article. SOLUTION: A stationary article monitoring device 1 consists of a reflected wave analysis device 2 and an LC resonance tag 3 to be attached to the stationary article. Close to the stationary article with the LC resonance tag 3 attached are provided with a transmission antenna 7 and a reception antenna 8. The LC resonance tag 3 reflects a sweep frequency electronic wave which the reflected wave analysis device 2 transmits and receives its echo wave. The received wave undergoes a binary processing, and waveform pattern data under a normal condition as a reference are successively collated with received waveform pattern data by a waveform pattern analysis device 14. When a collated result is not coincident, a CPU 4 transfers to an alarm device 16 information warning that a stationary article has been moved. |
