| 摘要 |
<p>A smoke or fire detection device 1 for monitoring region along a monitoring section 2, has a camera device 3, which for generating image data of the monitoring region 2, the image data evaluated by device 6 to detect fire features such as smoke or flames. The camera may have a lens 7 and may be designed so that the monitoring region sector has a maximum viewing angle alpha of less than 5°, preferably less than 3° and in particular less than 1°. Alternatively the evaluation device 6, may define the monitoring region sector to the stated maximum angle. The camera may view a marker image 4 that may be illuminated or projected by optical means 8a near the camera or 8b remote for the camera. The camera 3 and the mark 4 may be separated by up to 20m.</p> |
