Method and system to detect tampering using light detector
First Claim
Patent Images
1. An optical anti-tamper system, the system comprising:
- at least one array of light sources located within a chassis;
at least one array of photosensitive elements located within the chassis, the array of photosensitive elements in communication with an alarm, wherein the alarm is operable to transmit a tamper-event warning signal if an increased light level is detected by at least one array of photosensitive elements;
an opaque layer located between the array of light sources and the array of photosensitive elements, the opaque layer operable to prevent light emitted from the array of light sources from being incident on the array of photosensitive elements when in an unbroken state; and
a transparent layer located between the array of light sources and the array of photosensitive elements, the transparent layer operable to break the opaque layer when a protected component positioned adjacent to the transparent layer is touched during a tampering event so that the opaque layer is in a broken state, wherein the array of light sources and the array of photosensitive elements are positioned so that the light emitted from the array of light sources is incident on the array of photosensitive elements when the opaque layer is in the broken state.
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Abstract
An optical anti-tamper system that includes at least one array of light sources located within a chassis and at least one array of photosensitive elements located within the chassis. The array of photosensitive elements are in communication with an alarm. The alarm is operable to transmit a tamper-event warning signal if an increased light level is detected by at least one array of photosensitive elements.
39 Citations
15 Claims
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1. An optical anti-tamper system, the system comprising:
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at least one array of light sources located within a chassis; at least one array of photosensitive elements located within the chassis, the array of photosensitive elements in communication with an alarm, wherein the alarm is operable to transmit a tamper-event warning signal if an increased light level is detected by at least one array of photosensitive elements; an opaque layer located between the array of light sources and the array of photosensitive elements, the opaque layer operable to prevent light emitted from the array of light sources from being incident on the array of photosensitive elements when in an unbroken state; and a transparent layer located between the array of light sources and the array of photosensitive elements, the transparent layer operable to break the opaque layer when a protected component positioned adjacent to the transparent layer is touched during a tampering event so that the opaque layer is in a broken state, wherein the array of light sources and the array of photosensitive elements are positioned so that the light emitted from the array of light sources is incident on the array of photosensitive elements when the opaque layer is in the broken state. - View Dependent Claims (2, 3, 4, 5, 7)
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6. An optical anti-tamper system, the system comprising:
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at least one array of light sources located within a chassis; at least one array of photosensitive elements located within the chassis, the array of photosensitive elements in communication with an alarm, wherein the alarm is operable to transmit a tamper-event warning signal if an increased light level is detected by at least one array of photosensitive elements, wherein the chassis in a closed state is impenetrable to light, wherein a chassis-opening tampering event occurs when the chassis is open to an external environment and external ambient light reaches the array of photosensitive elements, and wherein the increased light level is detected by the one or more arrays of photosensitive elements. - View Dependent Claims (15)
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8. A method of manufacture, the method comprising:
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positioning at least one array of light sources within a chassis; positioning at least one array of photosensitive elements within the chassis operable to receive light from at least one array of light sources; positioning at least one opaque layer to prevent light from propagating from the array of light sources to any one of the arrays of photosensitive elements; connecting an alarm in communication with one or more photosensitive elements correlated to the array of photosensitive elements; closing the chassis when the at least one array of light sources, the at least one array of photosensitive elements, and the at least one opaque layer are positioned; and calibrating the at least one array of photosensitive elements for an ambient light level within a closed chassis.
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9. An optical anti-tamper system, the system comprising:
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means to break an opaque layer positioned over an array of light sources responsive to a touching of one or more components within a chassis; means for detecting an increased light level at an array of photosensitive elements within the chassis responsive to the break; and means for generating a tamper-event warning signal responsive to the detecting. - View Dependent Claims (10)
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11. A method to detect a tampering event, the method comprising:
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breaking an opaque layer, wherein the break is located between an array of light sources and one or more arrays of photosensitive elements within the chassis; transmitting light from a portion of the array of light sources through the opaque layer responsive to breaking the opaque layer; detecting an increase in a light level at the one or more array of photosensitive elements responsive to the transmitting light; and generating a tamper-event warning signal responsive to the detecting. - View Dependent Claims (12, 13, 14)
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Specification