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    • 5. 发明授权
    • Ultra-sensitive smoke detector
    • 超敏感检测仪
    • US5581241A
    • 1996-12-03
    • US289659
    • 1994-08-12
    • Michael KaufmanRichard W. Thomas
    • Michael KaufmanRichard W. Thomas
    • G08B17/107G08B17/10
    • G08B17/107G08B17/113
    • A smoke detector that operates on the principle of scattered light is disclosed that has the capability of an operating sensitivity that is tens of times greater than that of smoke detectors presently available. Plural light sources are used, their light rays directed radially toward the center of a cylindrical detector chamber having a mirrored wall that reflects light back toward the chamber's center, thereby to brightly illuminate a central detection zone. Scattered light from smoke in this zone is detectable by a photocell at right angles to the converging multiple light rays. To obtain highly improved stability of the light output that enables ultra-high sensitivity, the light sources are light-emitting diodes in series connection and they are driven by a very stable constant voltage source that also powers the photocell detector. This system gains impressive sensitivity while reducing nuisance alarms that have been a common problem regarding efforts to increase smoke detector sensitivity. Whereas the goal of this invention is to improve the public safety, improvements are presented in smoke collection also, whereby ambient air is quickly and efficiently brought to the detector cell itself using convection currents that are enhanced by the aerodynamic design of the housing surrounding the cell.
    • 公开了以散射光原理工作的烟雾探测器,其具有比当前可用的烟雾探测器的操作灵敏度高几十倍的能力。 使用多个光源,它们的光线径向指向圆柱形检测器室的中心,该圆柱形检测器室具有将光反射回室的中心的镜面壁,从而明亮地照亮中央检测区。 在该区域内来自烟雾的散射光可以通过与会聚的多个光线成直角的光电池检测。 为了获得能够实现超高灵敏度的光输出的高度改进的稳定性,光源是串联连接的发光二极管,并且它们由也为光电池检测器供电的非常稳定的恒定电压源驱动。 该系统获得令人印象深刻的灵敏度,同时减少了增加烟雾探测器灵敏度方面常见问题的烦扰报警。 尽管本发明的目标是提高公共安全性,但是在烟气收集中也提出了改进,其中通过由围绕电池的壳体的空气动力学设计增强的对流电流将环境空气快速且有效地带到检测器单元本身 。