Magnetic Tamper Detection in Utility Meters
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Solution Overview
Problem
Utility meters are vulnerable to magnetic tampering, which reduces power measurements and cannot be detected remotely, as existing systems require multiple sensors and may miss low-level magnetic field changes.
Innovation Solution
A utility service meter equipped with a magnetic field strength sensor that continuously detects magnetic field strength, converts the analog signal to digital, and stores it for aberration monitoring, triggering an alarm upon detection of tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If remote metering and AMR are implemented, then reading efficiency and cost-effectiveness are improved, but the ability to physically inspect meters for tampering is lost
Solution Approach 1:
The patent replaces the mechanical/physical inspection system with an electronic magnetic field detection system. A magnetic field sensor continuously monitors the magnetic environment around the meter, detecting tampering attempts through electronic means rather than requiring physical presence or manual inspection, thus maintaining tamper detection capability while enabling remote operation
Solution Approach 2:
The patent introduces a magnetic field sensor as an intermediary detection mechanism. This sensor acts as a mediator between the meter and potential tampering attempts, providing indirect detection of magnetic interference that could indicate tampering, allowing remote monitoring without direct physical contact
2Measurement precision
If threshold-based magnetic detection is used, then strong magnetic tampering can be detected, but low-level magnetic field changes are missed
Solution Approach 1:
The patent employs dynamic monitoring by continuously measuring magnetic field strength over time and storing multiple readings. Instead of a static threshold comparison, the system analyzes temporal patterns and variations in magnetic field measurements, allowing detection of both strong sudden changes and subtle gradual variations that indicate tampering
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring magnetic field readings, comparing them against stored historical data, and adjusting detection parameters based on observed patterns. The system provides feedback loops that analyze the relationship between current and past measurements to identify anomalous changes indicative of tampering, improving detection of both strong and weak magnetic interference
3Reliability
If multiple sensors and threshold settings are required for detection, then detection coverage is improved, but device complexity increases
Solution Approach 1:
The patent makes the single magnetic field sensor universal by implementing a flexible software-based detection system that can identify multiple types of tampering through one sensor. The system can detect various tampering methods (magnetic saturation, attempted removal, physical interference) using a single magnetic sensor with adaptable detection algorithms, eliminating the need for multiple specialized sensors while maintaining comprehensive detection coverage
Solution Approach 2:
The patent changes detection parameters dynamically through software configuration rather than requiring multiple fixed sensors. The system can adjust sensitivity thresholds, monitoring intervals, and detection criteria based on operational conditions, allowing one sensor to perform the work of multiple sensors with fixed parameters by changing its operational parameters programmatically
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
Enhances magnetic tamper detection capabilities, reducing revenue loss by identifying tampering events that may not exceed threshold levels and providing timely alerts.
Implementation Method 1
a magnetic field strength sensor to continuously detect magnetic field strength proximate to a meter. The magnetic field strength sensor produces an analog voltage signal proportional to the detected magnetic field strength
Data Source
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AI summary
Described herein are embodiments of methods, devices and computer program products for tamper detection in a meter (106). One aspect of the method comprises using a magnetic field strength sensor (302) to continuously detect magnetic field strength proximate to a meter (106). The magnetic field strength sensor (302) produces an analog voltage signal proportional to the detected magnetic field strength. The analog voltage signal of the sensor (302) is continuously converted to a digital voltage signal. The digital voltage signal is stored in a memory (406) on an intermittent basis, and the digital voltage signal is monitored for an aberration that indicates tampering of the meter (106). If tampering is detected, then an alarm is triggered to indicate the tampering.