Vehicle detector system and method

Details Vehicle detector system and method Vehicle detector system and method

1996-05-02

1998-05-26

Hofsass, Jeffery

Communications: electrical

Vehicle detectors

Inductive

340933, 340988, 340989, 364436, 364437, G08G 101

Patent

active

057572887

ABSTRACT:
A vehicle detector for detecting a moving vehicle traversing a predetermined roadway includes a coil antenna for detecting electromagnetic radiation inherently generated and emitted by the vehicle as it traverses the predetermined path and producing a first signal. A low noise amplifier receives and amplifies the first signal and outputs an amplified first signal to a differential full wave amplitude modulation envelope detector and produces a second signal. A high pass filter having a predetermined cutoff frequency is connected to receive the second signal and output only third signals having a magnitude proportional to the electromagnetic signal being detected. A converter circuit converts the third signals to a digital signal, the converter circuit including a switching comparator having a source of a stable voltage reference level and outputting a fourth signal. A hysteresis detector causes the comparator to switch upon detection and thereby prevent output switching due to slower or noisy input signals, and a utilization device is connected to receive and be actuated by the fourth signal.

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