| 摘要 |
The present invention provides a Passive-Infrared (PIR) motion detector for detecting a moving body by detecting its intrinsic radiation in the infrared range. The PIR motion detector comprises a shell-shaped cover (30) with a cover opening (35) and a within the cover (30) disposed infrared- sensitive sensor in a sensor housing (22). The sensor housing is provided with a radiation- transmissive window as optical filter (22) and is sealed. The cover opening (35) is covered by a housing cover (40) in the form of a window or a lens. According to the invention, the housing cover (40) comprises a foil, plate or molded part made from one of the synthetic materials polymethylpentene (PMP), polytetrafluoroethylene (PTFE), polypropylene (PP), or polyester, whereby the foil, plate or molded part has a thickness of between 0.5 and 3 mm. The optical filter (22) in between the housing cover (40) and the sensor (20) is transmissive for Infrared radiation in the wavelength range between 3.5 μm and/or 6 μm and/or between 12.5 μm and at least 25 μm. |
