& ABACUS OPTICAL MECHANICS |
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Capacitive Sensors
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InsCaps product for Capacitive sensor (click on Sensor type to view full explanation) S-CATS (Segment Capacitive Anti-finger-Trap Sensor) a capacitance proximity sensor to detect objects in power closing panels CPS (Capacitive Proximity Sensor) a capacitance proximity sensing to detect objects |
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S-CATS (Segment
Capacitive Anti-finger-Trap
Sensor), a capacitance proximity sensing to detect objects in power closing panels |
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The capacitance "anti-squeeze sensor" for power closing doors (including elevator doors) consists of the electronics and a sensor probe. The sensors elements are embedded or attached to the leading edge of the door. The sensor is sensitive to objects of high dialectric value (i.e. human body part) at a user selectable distance of 0 to 10 cm from the sensor probe. When the object is detected (i.e. a body part) the power closing door can be made to reverse and thus prevent the trapping of a body part. The sensor's unique design and placement of the sensor elements enable it to distinguish between the opposing power closing door and the body part. In addition, the patented design enables the sensor to detect object that have low dialectric properties. The sensor can be designed so that:
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The power doors close normally when there is no object present.
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When an object ( Lady Lara) is detected between the closing doors, the sensor triggers to open the power closing door before the door compresses her |
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Theoretical Functioning of Sensor working prototype of the
S-CATS
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(Segment Capacitive
Anti-finger-Trap Sensor) |
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The
S-CATS (Segment Capacitive Anti-finger-trap Sensor),
is a capacitance proximity sensor used to detect objects in powered
closing panels. The capacitive sensor system prevents the pinching or
trapping of a human body part or foreign object by a power-closing
panel. The body part or object is sensed either before contact or at
the time of contact with the sensor electrode by a change in
capacitance. When the object or body part is detected, the power
closing panels is reversed or stopped to prevent the trapping of the
object.
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The sensing probe consist of multiple segments. Each segment detects the capacitance of the sensed object and the adjacent environment. The capacitance value for each of the segments are analyzed in real time and compared against the average of the highest value obtained for a certain number of segments. When the capacitance of one or more segments is less than the average of the capacitance of all or some of the segments minus a predetermined constant, the sensor system is triggered. |
Metal Bar (representing a power closing panel) approaching segmented capacitor probe |
A Finger (i.e. trapped body part) touching a metal bar (i.e. power closing panel) approaching segmented capacitor probe |
computer
screen in background indicates capacitance values
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Click here to view Abacus Optical Mechanics Capacitor sensors |
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To contact us:
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Anthony Bledin
612 Meadow Grove Lane Westlake Village, CA 91362 Phone: 805-494-4490 Fax: 805-494-9948 e-mail: abledin@abacusa.com updated October 31, 2003 |
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