| 摘要 |
PROBLEM TO BE SOLVED: To discriminate a human body and an article securely by a single sensor, and accurately give the alarm about the seat belt non-wearing. SOLUTION: A high-frequency signal with a variable frequency is delivered from an oscillator 2 to a sensor 1 through a transmission line 4, the level of the reflected wave from the sensor 1 is detected by a reflected wave sensor 3, the existence of a human body is detected from the frequency characteristic of the signal level detected by a controller 7, and when the existence of the human body is decided, and a seat belt wearing detecting switch 5 is OFF, controller 7 operates an alarm 6. |
