Seismic Intrusion Detection Device with Dynamic Sampling
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Solution Overview
Problem
Existing underground seismic sensors for intrusion detection face challenges in power supply, with buried cables increasing installation costs and battery-powered systems requiring frequent maintenance due to high energy consumption and battery replacement needs.
Innovation Solution
A device comprising a vibration sensor, processor, transmitter, and battery, connected by a conductive wire, which adjusts sampling precision based on seismic signal thresholds to reduce power consumption and maintain system reliability, allowing for efficient detection and alerting of intrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is provided by a buried cable means, then installation costs are higher and damage to the cable may be difficult to locate and can incapacitate the system, but system reliability is improved
Solution Approach 1:
The patent extracts the power supply component from the underground sensor system by using wireless power transfer. The power transmitter is placed above ground while the power receiver is embedded with the seismic sensor underground, eliminating the need for buried power cables and their associated installation complexities and reliability risks.
2Ease of manufacture
If power is provided by battery, then installation costs are reduced but maintenance costs increase due to tracking battery lifetimes and providing battery replacements
Solution Approach 1:
The system implements self-service by automatically managing power supply through wireless power transfer. The power receiver continuously receives power from the above-ground transmitter, eliminating the need for manual battery replacement and reducing maintenance requirements while keeping installation simple.
3Measurement precision
If sampling precision is increased to improve detection accuracy, then measurement precision is improved but energy consumption increases
Solution Approach 1:
The patent applies dynamic sampling precision adjustment where the sampling rate and precision are varied based on the current operational context. During normal conditions, lower precision sampling reduces power consumption, while during suspected intrusion events, precision is increased to improve detection accuracy, thus dynamically balancing energy usage and detection performance.
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 reduces maintenance costs and enhances system reliability by optimizing power usage and precision settings in detecting seismic threats, enabling effective intrusion detection with reduced energy consumption and easier maintenance.
Implementation Method 1
The buried sensors pick up vibrations of the earth, such as may be caused by vehicles or footsteps.
Implementation Method 2
The conductive wire connects the vibration sensor and the processor, transmitting seismic signals from the vibration sensor to the processor.
Data Source
AI summary
Methods and a device for detecting physical intrusion are providing, the device including a vibration sensor, a processor, a transmitter, a battery, and a conductive wire connecting the vibration sensor and the processor. The vibration sensor is affixed to a first part of the device, and the processor, transmitter, and battery are affixed to a second part of the device. The first and second parts, when attached together, form a case containing the conductive wire. The device performs steps of: sampling a set of seismic signals from the vibration sensor, determining that the set of seismic signals matches a seismic threat pattern, and responsively issuing an intrusion alert.