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    • 7. 发明授权
    • Self-adjusting smoke detector with self-diagnostic capabilities
    • 具有自我诊断功能的自调烟雾探测器
    • US5798701A
    • 1998-08-25
    • US807627
    • 1997-02-27
    • Brian A. BernalDaniel P. CroftKirk R. JohnsonDouglas H. MarmanMark A. Peltier
    • Brian A. BernalDaniel P. CroftKirk R. JohnsonDouglas H. MarmanMark A. Peltier
    • G08B17/10G08B29/18G08B29/24
    • G08B29/24G08B17/10G08B29/185
    • A smoke detector (10) has internal self-adjustment and self-diagnostic capabilities. It includes a microprocessor-based alarm control circuit (24) that periodically checks the sensitivity of a smoke sensing element (20) to a smoke level in a spatial region (12). The alarm control circuit and the smoke sensor are mounted in a discrete housing (25) that operatively couples the smoke sensor to the region. The microprocessor (30) implements a routine (50) stored in memory (32) by periodically determining a floating adjustment (FLT.sub.-- ADJ) that is used to adjust the output (RAW.sub.-- DATA) of the smoke sensing element and of any sensor electronics (40) to produce an adjusted output (ADJ.sub.-- DATA) for comparison with an alarm threshold. The floating adjustment is not greater than a maximum value (ADJISENS) or less than a minimum value (ADJSENS). Except at power-up or reset, each floating adjustment is within a predetermined slew limit of the immediately preceding floating adjustment. The floating adjustment is updated with the use of averages (NEW.sub.-- AVG) of selected signal samples taken during data gathering time intervals having a data gathering duration that is long in comparison to the smoldering time of a slow fire. The adjusted output is also used for self-diagnosis.
    • 烟雾探测器(10)具有内部自我调节和自我诊断功能。 其包括基于微处理器的报警控制电路(24),其周期地检查烟感测元件(20)在空间区域(12)中的烟雾水平的灵敏度。 警报控制电路和烟雾传感器安装在离散的壳体(25)中,其将烟雾传感器可操作地耦合到该区域。 微处理器(30)通过周期性地确定用于调节烟雾感测元件和任何传感器电子器件的输出(RAW-DATA)的浮动调整(FLT-ADJ)来实现存储在存储器(32)中的程序(50) (40)以产生用于与报警阈值进行比较的调整输出(ADJ-DATA)。 浮动调整不大于最大值(ADJISENS)或小于最小值(ADJSENS)。 除了上电或复位之外,每个浮动调整都在紧接在前的浮动调整的预定转差极限之内。 使用在数据采集时间间隔内采集的所选信号样本的平均值(NEW-AVG)进行浮动调整,数据采集持续时间与缓慢火焰的阴燃时间相比较长。 调整后的输出也用于自我诊断。
    • 10. 发明授权
    • Smoke detector system with self-diagnostic capabilities and replaceable
smoke intake canopy
    • 具有自诊断功能的烟雾探测器系统和可更换的吸烟罩
    • US5546074A
    • 1996-08-13
    • US110131
    • 1993-08-19
    • Brian A. BernalRobert G. FischetteKirk R. JohnsonDouglas H. Marman
    • Brian A. BernalRobert G. FischetteKirk R. JohnsonDouglas H. Marman
    • G08B17/107G08B29/14G08B29/18
    • G08B29/20G08B17/107G08B17/113G08B29/145
    • A self-contained smoke detector system has internal self-diagnostic capabilities and accepts a replacement smoke intake canopy (14) without a need for recalibration. The system includes a microprocessor-based self-diagnostic circuit (200) that periodically checks sensitivity of the optical sensor electronics (24, 28) to smoke obscuration level. By setting tolerance limits on the amount of change in voltage measured in clean air, the system can provide an indication of when it has become either under-sensitive or over-sensitive to the ambient smoke obscuration level. An algorithm implemented in software stored in system memory (204) determines whether and provides an indication that for a time (such as 27 hours) the clean air voltage has strayed outside established sensitivity tolerance limits. The replaceable canopy is specially designed with multiple pegs (80) having multi-faceted surfaces (110, 112, 114). The pegs are angularly spaced about the periphery in the interior of the canopy to function as an optical block for external light infiltrating through the porous side surface (64) of the canopy and to minimize spurious light reflections from the interior of the smoke detector system housing (10) toward a light sensor photodiode (28). The pegs are positioned and designed also to form a labyrinth of passageways (116) that permit smoke to flow freely through the interior of the housing.
    • 独立的烟雾探测器系统具有内部自诊断功能,并可接受更换吸烟罩(14),无需重新校准。 该系统包括基于微处理器的自诊断电路(200),其周期性地检查光学传感器电子器件(24,28)的吸收遮蔽水平的灵敏度。 通过设置在清洁空气中测量的电压变化量的公差限制,系统可以提供何时变得对环境烟雾遮蔽级别过度敏感或过度敏感的指示。 在存储在系统存储器(204)中的软件中实现的算法确定是否并且提供在一段时间(例如27小时)清洁空气电压已经偏离建立的灵敏度容差极限之外的指示。 可更换的顶篷是特别设计的具有多个多面(110,112,114)的多个钉(80)。 钉子围绕顶盖的内部的周边成角度地间隔开,以用作外部光线穿过顶盖的多孔侧表面(64)的光学块,并且最小化来自烟雾探测器系统壳体内部的杂散光反射 (10)朝向光传感器光电二极管(28)。 钉子的定位和设计也可以形成迷宫式的通道(116),允许烟雾自由地流过外壳的内部。