NFC-Powered Tamper Detection Circuit for Continuous Status Reporting
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Solution Overview
Problem
Existing tamper detection systems are inadequate in continuously monitoring and reporting the status of detection elements after they have been disturbed, and they often lack the ability to differentiate between various types of disturbances, which can lead to false resets or missed tampering events.
Innovation Solution
A tamper detection device powered by a near-field-communication (NFC) signal that sets and reports the status of a detection element as undisturbed or disturbed based on changes in inductance, capacitance, or resistance, using a detection circuit that includes a reference oscillator and a detection oscillator to compare frequencies and count cycles, ensuring continuous operation and accurate reporting even after the detection element has been tampered with.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing tamper detection systems are used, then basic tamper detection is provided, but continuous monitoring and reporting after disturbance is inadequate
Solution Approach 1:
The detection circuit is designed to continue operating and reporting status even after the detection element has been disturbed. The system maintains continuous monitoring capability by ensuring the detection circuit remains functional post-tamper, allowing ongoing detection and reporting of subsequent disturbances without interruption or reset.
2Measurement precision
If existing tamper detection systems are used, then tamper events are detected, but differentiation between various types of disturbances is lacking
Solution Approach 1:
The detection element is segmented into multiple functional components with distinct electrical characteristics (inductance, capacitance, resistance). Each component can be independently affected by different types of disturbances, allowing the system to differentiate between various tamper methods by analyzing which specific electrical property has changed.
Solution Approach 2:
The system monitors multiple electrical parameters (inductance, capacitance, resistance) of the detection element simultaneously. By detecting changes in different parameters, the system can identify and differentiate between various types of disturbances based on their characteristic impact on specific electrical properties.
3Reliability
If existing tamper detection systems are used, then tamper events are detected, but false resets occur
Solution Approach 1:
The system incorporates feedback mechanisms that continuously monitor the detection element status and provide information about tamper events. This feedback loop prevents false resets by maintaining awareness of the disturbed state and ensuring that reset operations are properly authorized and tracked, preventing unauthorized or erroneous reset actions.
4Loss of information
If existing tamper detection systems are used, then basic detection is provided, but prioritization of disturbed elements is not available
Solution Approach 1:
The system assigns different importance levels or priorities to different detection elements based on their specific functions and locations. By implementing local quality differentiation, the system can prioritize reporting of critical disturbed elements while maintaining comprehensive monitoring, reducing the complexity of status reporting by focusing attention on the most important changes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables continuous and accurate tamper detection and reporting, preventing false resets and ensuring that manipulations such as opening, reclosing, or replacing the detection element are detectable, while also allowing for prioritization of disturbed detection elements based on importance.
Implementation Method 1
detection circuit, configured to be powered by a near-field-communication (NFC) signal
Implementation Method 2
the detection circuit includes a reference oscillator and a detection oscillator; the detection circuit is configured to count a number of detection oscillator clock cycles and compare to a number of reference oscillator clock cycles
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
One example discloses a tamper detection device, comprising: a detection circuit, configured to be powered by a near-field-communication (NFC) signal and store a status of a detection element; wherein the detection circuit is configured to set the status to undisturbed in response to an undisturbed state of the detection element; wherein the detection circuit is configured to set the status to disturbed in response to a disturbed state of the detection element; and wherein the detection circuit is configured to electrically report the detection element status in response to a wireless query signal.