Magnetic Rotation Sensing for Utility Meter Tampering Detection

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Solution Overview

Problem

Current utility meter rotation sensing techniques fail to effectively detect tampering or malfunctions, such as a dial hand falling off, due to meters having a zero-use state as normal, leading to potential revenue loss and difficulty in remote detection.

Innovation Solution

A rotation sensing device with a magnet apparatus comprising two magnets and two magnetic field sensors coupled to a dial cover, generating periodic signals based on the rotation of the dial, allowing for detection of abnormal conditions like tampering, missing parts, or malfunctions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional rotation sensing techniques are used, then the meter can measure consumption, but tampering and malfunctions cannot be detected

Engineering Contradiction:

Improvedetection of tampering and malfunctionsVSAvoidinability to detect abnormal conditions

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The sensing system is divided into multiple independent sensors (first magnetic field sensor, second magnetic field sensor, third magnetic field sensor) positioned at different locations. Each sensor detects specific aspects of rotation or abnormal conditions, allowing the system to distinguish between normal operation and tampering events by analyzing the pattern of sensor responses.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Magnetic field sensors serve as intermediaries between the mechanical rotation and the detection system. These sensors convert mechanical motion into magnetic field variations, which can then be processed to identify both normal consumption patterns and abnormal conditions such as tampering or dial hand detachment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If zero-use is considered normal state, then the meter can indicate consumption, but remote detection of dial hand detachment becomes difficult

Engineering Contradiction:

Improveremote detection capabilityVSAvoiddetection accuracy of abnormal conditions

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system continuously monitors the magnetic field signals from multiple sensors and compares them against expected patterns for normal operation. When the dial hand detaches or tampering occurs, the feedback mechanism detects deviations from normal signal patterns, enabling remote identification of abnormal conditions even when the display shows zero-use.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system adds a temporal and pattern-based dimension to the detection process. Instead of relying solely on the displayed consumption value, the system analyzes the sequence and pattern of sensor signals over time to distinguish between legitimate zero-consumption periods and abnormal conditions like dial hand detachment.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Measurement precision

If single sensor is used, then the device complexity is low, but measurement precision for detecting abnormal conditions is insufficient

Engineering Contradiction:

Improvedetection precision of rotation and abnormal conditionsVSAvoidnumber of sensors and magnets

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Different sensors are positioned at specific locations with different sensitivities to detect specific aspects of rotation or abnormal conditions. The first, second, and third magnetic field sensors are strategically placed to detect different phases or characteristics of the rotation cycle, allowing precise identification of both normal operation and abnormalities.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Multiple sensors and magnets are combined into an integrated sensing apparatus that works as a unified system. The magnets are positioned on the dial hand and the sensors are mounted on the meter housing, creating a coordinated detection system that provides precise measurement through the combined information from all sensors.

Inventive Principle:

Principle #5Merging (Combining)

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

Enables remote detection of tampering and malfunctions, ensuring accurate consumption measurement and reducing revenue loss by generating distinct signals for normal and abnormal conditions.

Implementation Method 1

a magnet apparatus comprising a first magnet and a second magnet... a first magnetic field sensor configured to be coupled to a dial cover... the distance between the first magnet of the magnet apparatus and the first magnetic field sensor is a function of the magnetic field strength of the first magnet

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS8138751B2Magnetic rotation sensing for meter

Publication Date: 2012.03.20 LANDIS GYR TECH INC

AI summary

Embodiments for rotation sensing are provided. A device may include a magnet apparatus including a first and a second magnet. The magnet apparatus may be configured to be coupled to a dial apparatus of a meter. The device may include a first magnetic field sensor and a second magnetic field sensor configured to be coupled to a dial cover. The magnetic field sensors may generate signals based upon the sensed magnetic fields. In some embodiments, the device may include logic for counting rotations and/or logic for detecting abnormal conditions such as a missing dial hand, missing dial cover, magnetic tampering and/or malfunctioning magnetic field sensors.