Flame Detector Coverage Verification Using Co-Aligned Light Beam
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Solution Overview
Problem
Flame detection systems are ineffective in detecting fires that occur outside the optical field of view of individual flame detectors, leading to delayed response and increased risk due to larger fires when obstructions or peripheral locations are involved.
Innovation Solution
A flame detector coverage verification system using an optical source and light-path control unit to direct a light beam co-aligned with the detector's centerline, allowing for pan and tilt movements to visually demarcate the detector's field of view, including a mirror and actuator mechanism for beam reflection, and indicators for angular orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If flame detectors are positioned to cover larger areas, then the detection coverage area increases, but the detection precision and sensitivity at peripheral locations deteriorates
Solution Approach 1:
The patent divides the detection system into multiple flame detectors positioned at different locations and orientations. Each detector covers a specific sector with high sensitivity, and together they provide comprehensive coverage of the entire area without sacrificing detection precision at any location.
2Area of stationary object
If the optical field of view is increased to detect more area, then the coverage improves, but the ability to detect small incipient fires deteriorates
Solution Approach 1:
The patent positions multiple detectors with their optical axes directed toward specific zones of interest where incipient fires are most likely to occur. Each detector is optimized for its local area, maintaining high sensitivity for small fires in its specific coverage zone while collectively covering the entire facility.
3Reliability
If detectors are placed closer together to improve detection coverage, then the detection reliability improves, but the system complexity and installation cost increases
Solution Approach 1:
The patent employs standardized flame detector units that can be universally mounted on existing structural elements such as pipes, beams, and columns. Each detector is designed to perform multiple functions including detection, coverage verification, and system integration, reducing the need for additional specialized components and simplifying installation.
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 early fire detection by ensuring complete coverage, reducing the risk of larger fires by visually verifying and adjusting the detector's field of view, thereby triggering fire mitigation actions promptly.
Implementation Method 1
an optical source for generating a light beam
Implementation Method 2
the control unit includes a mirror for reflecting the light beam and a mirror actuator mechanism configured to position the mirror to reflect the light beam through the range of movement
Data Source
Figure 1~1A
Figure 2~3
Figure 4
AI summary
An embodiment of a flame detector coverage verification system includes an optical source for generating a light beam, and a control unit configured to point the beam in a direction generally co-aligned with an optical center line of the flame detector and through a range of movement about the direction to visually demarcate an area that falls within the flame detector's field of view. In one embodiment, the control unit includes a movable mirror to deflect the laser beam. The system may include an indicator device configured to determine and visually indicate a pan direction of the detector optical center line with respect to a defined direction, and a declination indicator configured to determine and visually display the tilt angle (angle of declination) of the detector optical center line with respect to a ground plane. Another embodiment of a flame detector coverage verification system includes an optical source for generating a light beam, and a light-path control unit connected to the optical source and configured to direct the beam through a range of movements about a center line direction of the flame detector to visually demarcate an area that falls within the flame detector's field of view. An indicator device configured to visually indicate a pan direction of the detector optical center line. A tilt indicator is configured to determine and visually display the tilt angle of the detector with respect to a ground plane. A hub structure temporarily attaches the control unit to the flame detector, the control unit pivotally connected to the hub structure so that the optical source light beam is oriented perpendicular to a ground plane.