Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-10-19
2000-09-05
Wu, Daniel J.
Communications: electrical
Condition responsive indicating system
Specific condition
340556, 340522, 340521, 340551, 340571, 340555, 340557, 340540, G08B 2300
Patent
active
061149632
ABSTRACT:
A set of sensors or sensor pairs capable of detecting the presence of a person passing through a portal is used for monitoring the portal. In one embodiment the portal has spaced apart upright supports. On one of the upright supports is mounted the sensors and the other upright support is used as a surface for reflection of the wave energy transmitted. When a person is present in the portal the person reflects the wave energy. The receiver is capable of detecting the time duration between transmission and receipt of the wave energy signal. In a second embodiment, the sensors are mutually inductively coupled in pairs. When a person is present within the portal the mutual inductance is changed in one or more of the sensor pairs. This change in mutual inductance is sensed and used as a means for determining which person is present in the portal. For example, a family may comprise two adults, a teenager, a preteen and a small child. The use of four sensors enables the system to detect when an adult passes through the portal which causes all four sensors to react due to the superior height of the adult. When three sensor react the system knows that the teenager is present. When two sensors react the system knows that the preteen is present, and when only one sensor reacts, the young child is present. A different alarm reaction is programmed for each instance.
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Blake Whitney
Pavlidis Lazaros
Nguyen Tai T.
Wu Daniel J.
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