| 摘要 |
PROBLEM TO BE SOLVED: To reduce malfunctions even at outdoor, and to enable full secure use. SOLUTION: This detection method comprises a step of converting an analog signal from an intrusion detection sensor 2 into a digital signal, a step of calculating the level differences between two continuous sampling values, a step of sequentially storing the level differences in chronological order, and a step of counting the number of stored level differences, determining whether the number of stored level differences whose values are between a lower threshold B and an upper threshold A, by exceeding a second setting N, when the counted number becomes a first set value L, determining intrusion. COPYRIGHT: (C)2007,JPO&INPIT |
