Passenger screening system and method
First Claim
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1. A passenger screening system, comprising:
- a floor having a top surface;
an inductive sensor positioned under the top surface of the floor, the inductive sensor comprising;
a first gradiometer configured to generate a first pair of opposing current paths and a second pair of opposing current paths substantially perpendicular to the first pair of current paths; and
a second gradiometer disposed adjacent said first gradiometer and configured to generate a third pair of opposing current paths and a fourth pair of opposing current paths substantially perpendicular to the third pair of current paths, said first and second gradiometers each configured to operate at a first frequency associated with a first target substance and at a second frequency associated with a second target substance to facilitate detecting a presence of at least one of the first target substance and the second target substance wherein the first and second pairs of current paths cooperate to generate four distinct combinations of magnetic fields for detection of the presence of said at least one the first and second target substances.
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Abstract
A passenger screening system including a first gradiometer, and a second gradiometer disposed adjacent the first gradiometer. The first and second gradiometers are each configured to operate at a first frequency and a second frequency to facilitate detecting the presence of an explosive material. A method of operating the passenger screening system is also described herein.
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Citations
20 Claims
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1. A passenger screening system, comprising:
a floor having a top surface;
an inductive sensor positioned under the top surface of the floor, the inductive sensor comprising;
a first gradiometer configured to generate a first pair of opposing current paths and a second pair of opposing current paths substantially perpendicular to the first pair of current paths; and
a second gradiometer disposed adjacent said first gradiometer and configured to generate a third pair of opposing current paths and a fourth pair of opposing current paths substantially perpendicular to the third pair of current paths, said first and second gradiometers each configured to operate at a first frequency associated with a first target substance and at a second frequency associated with a second target substance to facilitate detecting a presence of at least one of the first target substance and the second target substance wherein the first and second pairs of current paths cooperate to generate four distinct combinations of magnetic fields for detection of the presence of said at least one the first and second target substances.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating a passenger screening system, said method comprising:
operating a first gradiometer to detect a presence of at least one of a first target substance and a second target in a first shoe, the first gradiometer configured to generate a first pair of opposing current paths and a second pair of opposing current paths substantially perpendicular to the first pair of current paths; and
operating a second gradiometer to detect the presence of the at least one of the first target substance and the second target substance in a second shoe, the second gradiometer configured to generate a third pair of opposing current paths and a fourth pair of opposing current paths substantially perpendicular to the third pair of current paths, wherein the first and second gradiometers are each configured to operate at a first frequency associated with the first target substance and a second frequency associated with the second target substance to facilitate detecting the presence of the at least one of the first target substance and the second target substance wherein the first and second pairs of current paths cooperate to generate four distinct combinations of magnetic fields for detection of the presence of said at least one the first and second target substances.- View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification