Fiber Optic Fire Detector Status Sensing in Explosive Areas
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Solution Overview
Problem
Existing fire detection systems rely on electrical signals that can be hazardous in explosive environments, and there is a need for a more reliable and safer method to detect the status of fire detection devices like pull stations and heat detectors.
Innovation Solution
A fiber optic detection system that uses light scattering to determine the configuration of fire detection components, such as alarm activation mechanisms and heat responsive elements, by emitting light through a fiber optic cable and analyzing scattered light to identify changes in geometry or status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical signals are used in fire detection systems, then the system can effectively detect and communicate fire conditions, but the system creates a hazard in explosive environments due to potential electrical sparks
Solution Approach 1:
The patent replaces electrical signal transmission with optical signal transmission using fiber optic cables. The detection device uses a light source to emit light through the fiber optic cable, and a photodetector to convert the modulated light back to electrical signals for processing. This substitution eliminates the transmission of electrical signals through the building wiring system, thereby removing the spark hazard in explosive environments while maintaining effective fire detection and communication capabilities
Solution Approach 2:
The fiber optic cable serves as an intermediary medium that transmits information optically rather than electrically. The light source and photodetector act as conversion intermediaries, transforming electrical signals to optical signals for safe transmission and then converting them back at the receiving end. This intermediary approach allows the system to maintain electrical functionality where needed while ensuring safe optical transmission through potentially hazardous areas
2Object-affected harmful factors
If fiber optic cables are used to transmit light signals, then the system eliminates electrical hazards in explosive environments, but the system complexity increases due to the need for light sources and photodetectors
Solution Approach 1:
The patent combines the light source, photodetector, and fire detection functionality into an integrated detection device. The light source is positioned to emit light through the fiber optic cable, while the photodetector is positioned to receive the modulated light and convert it to electrical signals. This merging of functions reduces the need for separate components and simplifies the overall system architecture, making the increased complexity manageable while maintaining the safety benefits of optical transmission
3Reliability
If the detection device uses light scattering to determine component configuration, then the system can detect device status without electrical contacts, but the measurement precision may be affected by environmental factors
Solution Approach 1:
The patent replaces traditional electrical contact-based status detection with optical detection using light scattering. The detection device includes a light source that emits light toward a component, and a photodetector that detects the scattered light to determine the component's configuration or status. This substitution eliminates the need for electrical contacts while providing reliable status detection, and the optical method is inherently more resistant to environmental factors like humidity and corrosion that affect electrical systems
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 system provides a safer and more reliable method for detecting the status of fire detection devices, reducing the risk of electrical sparks in explosive environments and enabling operation in various conditions, including high humidity and underwater, while also integrating with broader facility management systems.
Implementation Method 1
a fiber optic cable for transmitting light
Implementation Method 2
scattered light reflected from the component and returned to the node is transmitted to the control system
Data Source
Figure 1
Figure 1A
Figure 2A~2B
AI summary
A system for measuring a status of a detection device having a component transformable between a plurality of configurations includes a fiber optic cable for transmitting light. The at least one fiber optic cable defines a node arranged in communication with the component. A control system is operably coupled to the fiber optic cable such that scattered light reflected from the component and returned to the node is transmitted to the control system. The control system analyzes the scattered light to determine the configuration of the component.