Fiber Optic Tamper Switch Toggle Arm Microbend
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Solution Overview
Problem
Fiber optic security systems face challenges in harsh environments due to sensor seal deterioration and complex installation processes, which can lead to system failure and unauthorized access detection delays.
Innovation Solution
A fiber optic tamper switch system that uses optical time-domain reflectometry to detect signal attenuation or dispersion within the optical fiber, allowing for easy installation and operation in harsh conditions without the need for splicing, featuring a toggle arm mechanism that induces a microbend in the fiber to detect movement and a locking mechanism to prevent quick reset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiber optic sensors are sealed to prevent environmental contaminants, then sensor reliability is improved, but seal deterioration over time still causes sensor failure
Solution Approach 1:
The patent replaces the mechanical sealing system with an optical sensing system. Instead of relying on physical seals to protect fragile components, the invention uses an optical fiber that runs through the sensor housing and detects movement by measuring changes in light transmission when the housing is tampered with. This eliminates the seal-deterioration problem entirely by substituting mechanical protection with optical detection.
2Measurement precision
If fiber optic sensors are installed with splicing at each sensor, then measurement precision is improved, but installation complexity and time increase
Solution Approach 1:
The patent segments the optical fiber into two separate cables that connect to opposite sides of the sensor housing. This segmentation allows the fiber to pass through the housing without requiring splicing at the sensor location. The optical detection function is maintained while eliminating the complex splicing process, as the fiber simply passes through guide pins in the housing.
Solution Approach 2:
The patent introduces guide pins as intermediary elements that facilitate the passage of the optical fiber through the sensor housing. These guide pins provide a structured path for the fiber, ensuring proper alignment and protection without requiring complex splicing operations. The guide pins act as mediators between the fiber and the housing structure.
3Ease of operation
If a simple optical fiber detection system is used, then ease of installation is improved, but detection speed and reliability may be compromised
Solution Approach 1:
The patent incorporates a toggle arm mechanism that dynamically responds to housing movement. When the housing is tampered with, the toggle arm pivots and creates a microbend in the optical fiber, significantly altering light transmission. This dynamic mechanical-optical coupling enhances detection sensitivity and reliability while maintaining the simplicity of the overall system architecture.
Solution Approach 2:
The patent creates a composite sensing mechanism that combines optical fiber with a mechanical toggle arm structure. The optical fiber provides the detection medium while the toggle arm provides mechanical amplification of the tampering motion. This composite approach enhances detection reliability by converting small housing movements into significant optical signal changes without complicating the installation process.
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 security system reliability in harsh environments by reducing installation complexity, maintaining system integrity, and increasing detection speed while frustrating unauthorized resets.
Implementation Method 1
transmission of light thought fiber optic cable security systems have been developed
Implementation Method 2
the controller utilizes optical time-domain reflectometry to detect the position of an attenuation and/or dispersion of the light signal within the optical fiber and/or fiber optic cable
Implementation Method 3
a toggle arm mechanism that induces a microbend in the fiber to detect movement
Data Source
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AI summary
A fiber optic tamper switch is disclosed, wherein a moveable member is moved to actuate the switch. The switch includes a component subassembly block (116) and a cover (106). The switch includes a toggle arm (120) extending through the cover, contacting the moveable member and configured to rotate when the moveable member is moved. The switch includes a fiber capture bar (140) configured to receive a fiber optic cable and a fiber press bar (128) coupled to the fiber capture bar configured to actuate upon the movement of the toggle arm and translate the fiber capture bar in a first direction, effecting a bend in the fiber optic cable. The fiber optic cable is configured to attenuate a light signal when bent. The switch includes a locking mechanism preventing the unbending of the fiber optic cable.