| 摘要 |
PROBLEM TO BE SOLVED: To provide a monitoring device capable of not only surely detecting the state of a matter to be monitored but also being miniaturized and simplified. SOLUTION: This monitoring device 1 comprises two or more independent distance sensors 1 set toward different positions within a region 50 to be monitored to measure the distances to the matter to be monitored; an arithmetic unit 22 for arithmetically calculating the time change of the respective outputs of the distance sensors 11; and a detection processor 23 for detecting the shape change of the matter 2 on the basis of the calculated time change related to at least one selected distance sensor 11 of the distance sensors 11. |
