Thermally sensitive array device for presence detection around automatic doors
First Claim
1. A thermally sensitive array of passive infrared sensors for detecting an object around a moveable automatic door, comprising:
- each of said passive infrared sensors is a thermopile;
each of said thermopiles located around said moveable automatic door;
said moveable automatic door is adapted to open and close depending on the detection of said object around said moveable automatic door;
each of said thermopiles includes at least two thermocouple devices;
each of said thermocouple devices includes;
a thermocouple having first and second contacts;
an isolation layer;
said thermocouple engaging said isolation layer;
a substrate;
said isolation layer engaging said substrate;
a first source element and a second source element;
an absorptive cover in engagement with said first source element;
said first source element and said second source element are thermally coupled to said respective first and second contacts of said thermocouple; and
, voltage measuring circuitry affixed to said contacts of said thermocouple.
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Abstract
The present invention relates to a thermally sensitive array device for detecting a presence of a target object in a surveillance area. The device comprises a plurality of at least two thermally sensitive sensors provided in an array arrangement, each thermally sensitive sensor being associated with one of a corresponding plurality of at least two surveillance spots comprised in the surveillance area. Each thermally sensitive sensor comprises a sensitive element adapted to absorb a portion of thermal infrared radiation emitted from one of said plurality of targets located inside the surveillance cone corresponding to the thermally sensitive sensor. The thermally sensitive sensor can be a thermopile, a bolometer, or any other type. Electronic circuits in each thermally sensitive sensor are adapted to measure a signal generated in the thermally sensitive sensor as a consequence of the temperatures of the target.
36 Citations
26 Claims
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1. A thermally sensitive array of passive infrared sensors for detecting an object around a moveable automatic door, comprising:
- each of said passive infrared sensors is a thermopile;
each of said thermopiles located around said moveable automatic door;
said moveable automatic door is adapted to open and close depending on the detection of said object around said moveable automatic door;
each of said thermopiles includes at least two thermocouple devices;
each of said thermocouple devices includes;
a thermocouple having first and second contacts;
an isolation layer;
said thermocouple engaging said isolation layer;
a substrate;
said isolation layer engaging said substrate;
a first source element and a second source element;
an absorptive cover in engagement with said first source element;
said first source element and said second source element are thermally coupled to said respective first and second contacts of said thermocouple; and
, voltage measuring circuitry affixed to said contacts of said thermocouple. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- each of said passive infrared sensors is a thermopile;
Specification