Explosion-Proof Gas and Flame Imaging System
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Solution Overview
Problem
Traditional fixed gas detection systems require direct contact with the gas or rely on open path infrared beams, which may not effectively detect hazardous gases and flames in hazardous environments, and lack efficient methods to distinguish between gas leaks and thermal background radiation.
Innovation Solution
A passive infrared detection system using an optical system with a lens, uncooled focal plane array, and filtering function to capture and process images, employing a filter wheel or microlens array for multi-spectral analysis to differentiate gas leaks and flames from background radiation, with active and reference filters to discriminate between gas and flame emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional point detectors are used for gas detection, then the system structure is simple, but the detection capability is limited as gas must come into physical contact with the detector
Solution Approach 1:
The patent replaces traditional mechanical contact-based point detectors with an optical detection system using infrared cameras and spectral analysis. The system uses optical lenses, filters, and image processing to detect gas leaks and flames without physical contact, thereby improving detection capability while managing system complexity through electronic rather than mechanical means.
2Measurement precision
If open path infrared beam systems are used, then the detection path is extended, but the system cannot effectively distinguish between gas leaks and thermal background radiation
Solution Approach 1:
The patent applies local quality by using spectral filters that are tuned to specific absorption wavelengths of target gases. Instead of using a broadband detector that receives all thermal radiation, the system employs narrowband filters that selectively transmit only the characteristic infrared wavelengths absorbed by specific gases, enabling precise differentiation between gas leaks and background thermal radiation.
Solution Approach 2:
The system changes the detection parameter from broadband thermal radiation detection to narrowband spectral detection. By analyzing the absorption characteristics at specific wavelengths and comparing them across multiple spectral bands, the system can identify gas signatures distinct from background thermal emission, thereby improving measurement precision and reducing false positives.
3Reliability
If explosion-proof housing is implemented for hazardous environments, then safety is improved, but the optical transmission and detection efficiency may be reduced
Solution Approach 1:
The patent employs composite material strategies by using specialized infrared-transmissive materials for optical windows and lenses within the explosion-proof housing. These materials are selected to maximize infrared transmission while maintaining the structural integrity and explosion-proof certification of the enclosure, thereby minimizing the impact on optical detection efficiency while ensuring safety in hazardous environments.
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 continuous, reliable detection of gas leaks and flames in hazardous environments, reducing false alarms and providing accurate localization, speciation, and quantification of gases and flames, while meeting explosion-proof standards.
Implementation Method 1
passive infrared detection system using an optical system with a lens, uncooled focal plane array
Implementation Method 2
employing a filter wheel or microlens array for multi-spectral analysis to differentiate gas leaks and flames from background radiation
Implementation Method 3
optical system with a lens, uncooled focal plane array, and filtering function to capture and process images
Data Source
AI summary
A gas imaging system for remotely detecting gas emissions by passive images of infrared radiation includes an optical system having a field of view. The optical system has a lens, an optical filter system for filtering light passed through the lens, and a photosensitive array located at the focal plane of the optical system to produce multi-spectral infrared image data of a scene under observation. A multi-spectral image processing system is configured for processing the image data produced by the photosensitive array to detect hazardous gas emissions and to discriminate against infrared radiation emitted by false alarm sources. Some embodiments may be configured for flame detection. Other embodiments may be configured for gas and flame detection.