Communications: electrical – Vehicle detectors – Inductive
Patent
1997-07-22
1998-12-01
Tong, Nina
Communications: electrical
Vehicle detectors
Inductive
340933, 340910, 340917, 340918, 324236, 324654, G08G 101
Patent
active
058445021
ABSTRACT:
A device and method is provided for sensing an object or vehicle in proximity to a sensing zone, wherein the device is exposed to an environment temperature. The object sensing device comprises a sensor, such as an inductive loop having a characteristic, such as the inductance of the inductive loop, responsive to the proximity of the object is to the sensor; a signal generator, such as an oscillator, coupled to the sensor for producing a first periodical signal cycling at a first frequency dependent on the sensor characteristic and the environment temperature. A de-coupling mechanism for de-coupling or isolating the sensor from the signal generator so that the signal generator produces a second periodical signal cycling at a second frequency dependent on the environment temperature, but not substantially dependent on the characteristic of the sensor; and a device for producing a temperature-compensated response indicative of whether the object is in the sensing zone from the first and second periodical signals or their respective frequencies. Using the temperature-compensated object or vehicle sensing device, a gate operating system and a vehicle driver stimulus device is also provided herein.
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Parsadayan Walter
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Elite Access Systems, Inc.
Tong Nina
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