| 摘要 |
An area monitoring system (1) is configured to include a monitoring apparatus (2) and a reflector (3). The monitoring apparatus (2) includes a time-based detecting unit (10a) (i.e., a first detecting unit) that detects an intruder (5) at a scanning angle by measuring a distance to an object based on an elapsed time until reflected light is received, for a first detection area (R1). The monitoring apparatus (2) further includes a light reception amount-based detecting unit (10b) (i.e., a second detecting unit) that detects an intruder (5) at a scanning angle by comparing an actual light reception amount at a timing at which reflected light is received when radiated laser light is reflected by a reflector (3), and a light reception threshold (i.e., a reference light reception amount) set in advance, with a second detection area (R2) set farther than the first detection area (R1) as an area subjected to detection. |
