| 摘要 |
PROBLEM TO BE SOLVED: To provide a security device that can accurately detect the approach of an intruder in monitoring outdoor conditions with a Doppler sensor installed inside, by preventing malfunctions, for example, due to raindrops attaching to and moving down a window glass surface. SOLUTION: The security device 20 incorporating the microwave Doppler sensor 10 capable of determining object approach/separation is installed on an indoor ceiling 1. The monitoring direction (microwave output signal radiation direction) of the Doppler sensor is set at a predetermined downward angle (dipθ≈45°) to a window glass 2. The approach/separation determination based on the output of the Doppler sensor is "approach" for an approaching intruder, but the approach/separation determination based on the output of the Doppler sensor is "separation" for raindrops attaching to and moving down the window glass. The approach of an intruder can thus be detected without malfunctions due to raindrops. COPYRIGHT: (C)2007,JPO&INPIT
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