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    • 2. 发明授权
    • Motion sensing apparatus with variable threshold
    • 具有可变阈值的运动感应装置
    • US4556799A
    • 1985-12-03
    • US374184
    • 1982-05-03
    • John L. Rolando
    • John L. Rolando
    • G01P13/00G01P15/093G01F23/00
    • G01P13/00G01P15/093
    • Motion sensing apparatus comprise a mercury globule supported on an opaque concave surface having a transparent window at its lowest part. A photocell is exposed to light passing through the window as it is varied by movement of the mercury. The photocell output is passed to one terminal of a comparator, the other terminal of which is energized through a variable resistor by means of which the sensitivity of the comparator to the photocell input may be varied. The comparator output controls pulse generating apparatus which produces output pulses of controllable length or, alternatively, an electronically latched continuous output either of which may control mechanism of any kind.
    • 运动感测装置包括支撑在其最下部具有透明窗口的不透明凹面上的汞球。 当汞通过汞的移动而变化时,光电池暴露于穿过窗户的光线。 光电管输出被传送到比较器的一个端子,其另一个端子通过可变电阻器通电,借此可以改变比较器对光电管输入的灵敏度。 比较器输出控制产生可控长度的输出脉冲的脉冲发生装置,或者替代地,电子锁存的连续输出可以控制任何类型的机制。