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US 8,284,387 B2Granted
Methods and systems for recognizing tamper events
AssigneeHoneywell International Inc.
InventorsJames L. Tucker, Kara L. Warrensford, William J. Dalzell, Scott G. Fleischman
Life of this patent
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Abstract
A method of recognizing a tamper event is provided. The method uses an optical medium having a unique signature, and transmits at least one light wave into the optical medium. The light wave is altered by the unique signature of the optical medium and at least one property of the light wave is measured. Access to at least a portion of a system is conditioned based on the at least one property of the light wave.
Claims19
A method comprising:
- transmitting a first light wave into a first optical medium, the first optical medium having a first unique signature;
- after transmitting the first light wave into the first optical medium, measuring at least one property of the first light wave, wherein the first light wave was altered by the first unique signature;
- transmitting a second light wave into a second optical medium, the second optical medium having a second unique signature;
- after transmitting the second light wave into the second optical medium, measuring at least one property of the second light wave, wherein the second light wave was altered by the second unique signature;
- and
- conditioning access to at least a portion of a system based on a differential between the at least one property of the first light wave and the at least one property of the second light wave.
3 more elements
An apparatus comprising:
- an optical medium configured to have a unique signature, wherein the unique signature is configured to alter a property of a light wave traveling through the optical medium;
- a light emitter in optical communication with the optical medium;
- an opto-electrical component coupled to the optical medium and operable to measure at least one property of a light wave that has traveled in the optical medium;
- wherein the apparatus is configured to determine whether the at least one property of the light wave that has traveled in the optical medium has been altered;
- and
- an access system operable to condition access to at least a portion of the apparatus based on the at least one property of the light wave that has traveled in the optical medium.
3 more elements
A method comprising:
- measuring at least one value relating to a first optical property of a first optical fiber;
- measuring at least one value relating to a second optical property of a second optical fiber;
- calculating a differential between the at least one value relating to the first optical property and the at least one value relating to the second optical property;
- and
- conditioning access to a system based on the differential.
2 more elements
Dependencies are inferred from the claim text.