Transducing Cable Intrusion Detection via Time-Difference Analysis
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Solution Overview
Problem
Conventional perimeter intrusion detection systems based on vibration-sensing technology face challenges such as high costs due to the need for multiple electronic analyzers, complex installation requirements, and reduced reliability, especially when trying to accurately identify the point of intrusion along long zones.
Innovation Solution
A security system utilizing a section of transducing cable divided into portions with time delay units, where signals from both ends are used by a controller to determine the location of a disturbance based on time differences, allowing for a single analyzer system and reducing the need for multiple power and communication lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple electronic analyzers are used to accurately identify intrusion points along long zones, then measurement precision is improved, but device complexity and system cost increase
Solution Approach 1:
Multiple discrete electronic analyzers are merged into a single centralized controller that receives signals from the entire transducing cable. The controller processes time-difference information from signals arriving at different locations to determine intrusion points, eliminating the need for multiple separate analyzers while maintaining identification accuracy.
Solution Approach 2:
The system transitions from spatial distribution of multiple analyzers along the perimeter to a centralized temporal analysis approach. By measuring the time dimension of signal propagation along the transducing cable, the system achieves precise location identification without requiring multiple spatially distributed analyzers.
2Measurement precision
If multiple electronic analyzers are deployed to cover long perimeters, then measurement precision is improved, but reliability decreases due to increased electronic components
Solution Approach 1:
Multiple analyzers are consolidated into a single centralized controller, reducing the total number of electronic components that could fail. The single controller processes all signals from the transducing cable, eliminating failure points associated with multiple distributed analyzers while maintaining the capability to accurately identify intrusion locations through temporal signal analysis.
3Measurement precision
If zone length is reduced to improve intrusion point identification accuracy, then measurement precision is improved, but device complexity and cost increase due to more analyzers
Solution Approach 1:
Instead of improving precision by reducing spatial zone length and adding more analyzers, the system uses temporal dimension analysis. By measuring the time it takes for vibration signals to propagate along the transducing cable and calculating time differences at the centralized controller, the system achieves accurate intrusion point identification over long distances without increasing the number of devices.
4Measurement precision
If multiple analyzers are used to monitor discrete zones, then measurement precision is improved, but ease of operation and installation are worsened due to power and communication network requirements
Solution Approach 1:
Multiple distributed analyzers with their associated power and communication infrastructure are merged into a single centralized controller. The transducing cable itself serves as the signal transmission medium, eliminating the need for separate power and communication networks for each analyzer, thereby simplifying installation and operation while maintaining the ability to identify intrusion points along the entire perimeter.
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
This approach reduces system costs, increases accuracy in identifying intrusion points, and enhances system resilience by simplifying the controller and eliminating the need for multiple analyzers, while maintaining the ability to detect and locate disturbances along a boundary.
Implementation Method 1
a section of transducing cable, arranged along said boundary and configured such that a disturbance at one location on the boundary generates a signal at a corresponding location in the transducing cable
Implementation Method 2
each portion of transducing cable is separated from an adjacent portion by a time delay unit, configured to delay the transmission of said signal between the portions by a predetermined time delay
Data Source
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AI summary
A security system, for detecting a disturbance and determining the location of the disturbance along a boundary, the security system comprising a section of transducing cable, arranged along said boundary and configured such that a disturbance at one location on the boundary generates a signal at a corresponding location in the transducing cable that propagates from said location along the transducing cable towards first and second ends of said section of transducing cable; and a controller, configured to receive the signal from said first and second ends of the section of transducing cable and to determine the location in the transducing cable at which the signal was generated based on any difference in the time at which the controller receives the signal from said first and second ends.