Fluorescent Optical Fiber Tamper Detection
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Solution Overview
Problem
Monitoring vast and buried or enclosed conveyance media such as pipelines and cables for tampering is technically challenging and costly, requiring an efficient and effective method to detect breaches in shielding materials.
Innovation Solution
A system utilizing doped side-absorbing, end-emitting optical fibers shielded from ambient light, with sensors at both ends to detect changes in brightness indicative of breaches, allowing for the determination of tampering events and approximate location along the conveyance medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional monitoring methods are used for pipelines and cables, then detection capability is provided, but cost and technical complexity increase significantly
Solution Approach 1:
The patent introduces an intermediary substance (fluorescent dye or quantum dots) that absorbs light at the tamper location and transmits the signal through the optical fiber to remote sensors. This intermediary converts the local tamper event into a detectable remote signal, resolving the contradiction by enabling detection without complex local monitoring equipment.
Solution Approach 2:
The patent replaces traditional mechanical/electronic monitoring systems with an optical-based system using fluorescent optical fibers. The optical system detects tampering through light absorption and fluorescence emission, substituting complex mechanical sensors and processing systems with a simpler optical detection mechanism.
2Length of stationary object
If traditional monitoring methods are deployed over vast distances, then coverage is achieved, but cost becomes prohibitive
Solution Approach 1:
The optical fiber segment itself serves as both the transmission medium and the detection element. The fluorescent material embedded in the fiber automatically detects tampering and converts it into a detectable signal without requiring external power or active sensing components along the entire length, enabling cost-effective long-distance monitoring.
Solution Approach 2:
The optical fiber performs multiple functions simultaneously: it acts as the structural element providing long-distance coverage, the signal transmission medium carrying information back to sensors, and the detection element through its fluorescent properties. This multi-functionality reduces overall system cost while maintaining extensive coverage.
3Object-affected harmful factors
If shielding material is used to protect conveyance media, then protection is provided, but detection of breaches becomes more difficult
Solution Approach 1:
The patent utilizes changes in optical properties (fluorescence emission and light absorption) to detect breaches in shielding. When the shielding is intact, the optical fiber remains dark; when breached, ambient light enters and causes the fluorescent material to emit light or absorb light, creating a detectable optical signal change that indicates tampering.
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 cost-effective and efficient tamper detection and location identification, reducing maintenance costs and improving surveillance of extensive infrastructure by using optical fibers to sense light exposure through breaches in shielding materials.
Implementation Method 1
a doped side absorbing—end emitting optical fiber segment disposed proximate to the conveyance medium
Implementation Method 2
doped side absorbing—end emitting optical fiber segment
Data Source
AI summary
A method of detecting tampering with a conveyance medium may include determining a baseline brightness level detected at opposing ends of an optical fiber segment disposed proximate to the conveyance medium, determining whether a change in brightness above a threshold level occurs, and providing an output indicating that a breach in continuity of a shielding material that shields both the conveyance medium and the optical fiber segment from exposure to ambient light has occurred in response to the change in brightness being above the threshold level.