Automotive vehicle classification and identification by inductive signature
First Claim
1. An inductive vehicle detector, for a traffic-lane having width, comprising:
- at least one inductive sensor situated in the traffic-lane; and
wherein said inductive sensor comprises;
a wire-loop having width which is at least as great as the width of the traffic-lane; and
a means for measuring the inductance of the wire-loop.
1 Assignment
0 Petitions
Accused Products
Abstract
A wire-loop vehicle detector is configured with a vertically oriented blade aligned at an angle to the direction of traffic-flow with each end of the blade extending laterally beyond the normal limits of vehicle presence over the blade. The extended blade configuration of the wire-loop constrains over-passing vehicles to present repeatable inductive signatures while electromagnetic noise and thermal-drift are selectively canceled using a secondary coil to increase the signal-to-noise ratio of inductance measurements. Inductive signatures of vehicles are recorded using a high-speed and high-precision method of making multiple successive measurements of the inductance of a wire-loop as vehicles pass over. Inductive signatures of automotive vehicles are useful for parking-lot revenue control, car-bomb detection, passive security of isolated communities, and other traffic-flow monitoring and control applications.
20 Citations
21 Claims
-
1. An inductive vehicle detector, for a traffic-lane having width, comprising:
at least one inductive sensor situated in the traffic-lane; and
wherein said inductive sensor comprises;
a wire-loop having width which is at least as great as the width of the traffic-lane; and
a means for measuring the inductance of the wire-loop. - View Dependent Claims (2, 3, 4, 5, 6)
-
7. An inductive vehicle detector, for a traffic-lane, comprising:
at least one inductive sensor situated in the traffic-lane; and
wherein said inductive sensor comprises;
a vertically-oriented wire-loop; and
a means for measuring the inductance of the wire loop. - View Dependent Claims (8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21)
-
13. An inductive vehicle detector, for a traffic-lane, comprising:
- at least one inductive sensor situated in the traffic-lane; and
wherein said inductive sensor comprises;
a primary wire-loop with fixed spatial dimensions and orientation;
a secondary wire-loop having substantially similar spatial dimensions and orientation as the primary wire-loop, but wherein at least one spatial dimension of the secondary wire-loop is significantly offset with respect to the primary wire-loop; and
a means for measuring the inductance of the two wire-loops wherein the electromagnetic noise associated with both wire-loops combine and reduces the total electromagnetic noise associated with the two wire-loops.
- at least one inductive sensor situated in the traffic-lane; and
Specification