Gas Leakage Detection Using Dual-Band Thermal Imaging
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Solution Overview
Problem
Current gas leakage detection methods in industries are labor-intensive and inefficient, as they require local inspection and struggle with accurately identifying fugitive gas leaks, especially in environments where gases like methane are highly explosive and contribute to climate instability.
Innovation Solution
An imaging system using a thermal imaging sensor with interchangeable uncooled filters that capture images in two spectral bands, one including and one excluding the gas's detectable signature, processed to reconstruct a fused image enhancing gas leakage detection sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical detection systems with narrow band pass filters are used to detect gas plumes, then measurement precision is improved, but device complexity increases due to multiple filters and optical paths
Solution Approach 1:
The patent divides the detection task into two separate optical paths: one path with a narrow band pass filter tuned to the gas absorption wavelength for selective gas detection, and another path without the filter for capturing the background scene. This segmentation allows each path to be optimized for its specific function, improving measurement precision while keeping individual path complexity manageable
Solution Approach 2:
The patent merges the gas detection function and scene imaging function into a single integrated system. By combining the filtered optical path (for gas detection) and the unfiltered optical path (for scene imaging) and processing their outputs together, the system achieves both accurate gas plume detection and visual context capture without requiring completely separate systems
2Measurement precision
If sniffers are used for gas detection, then measurement precision is improved, but ease of operation deteriorates due to extensive labor requirements for local inspection
Solution Approach 1:
The patent replaces the mechanical/manual inspection process with an automated optical imaging system. Instead of requiring inspectors to physically approach and manually operate sniffers at various locations, the system uses cameras and image processing to automatically detect and visualize gas plumes from a distance, eliminating the need for local proximity and extensive manual labor
Solution Approach 2:
The patent creates a visual copy or representation of the gas plume by processing optical images to generate false-color images that display gas concentration distributions. This visual copying allows operators to remotely observe and analyze gas leaks without physical contact, improving ease of operation while maintaining detection precision
3Measurement precision
If dual band thermal imaging is used for gas detection, then measurement precision is improved, but use of energy increases due to multiple cameras and illuminators
Solution Approach 1:
The patent makes the imaging system multi-functional by enabling it to perform both scene imaging and gas detection using the same basic optical components. By processing images captured in different spectral bands (through filter manipulation) and comparing them, the system achieves accurate gas distribution detection without requiring completely separate imaging systems for each function, thereby reducing overall energy consumption
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 automatic and visually enhanced detection of gas leaks with high sensitivity and minimal labor, reducing false alarms and improving detection accuracy by matching image similarity through mathematical transforms, effectively addressing the inefficiencies of existing methods.
Implementation Method 1
an imaging system for imaging of a plume of a fugitive gas, dependent upon an electromagnetic wavelength absorption characteristic of the gas
Implementation Method 2
a bi-spectral selector assembly houses first and second filters in separate first and second optical paths for transmittal of electromagnetic energies emanating from the scene of interest
Implementation Method 3
The first and second filters have adjacent mutually exclusive narrow band pass characteristics only one of which corresponds to the electromagnetic wavelength absorption characteristic of the gas
Implementation Method 4
An image processor enhances the detected signal by comparing and processing images from different spectral bands to reveal gas plume characteristics
Data Source
AI summary
Imaging system and method for detecting the presence of a substance that has a detectable signature in a known spectral band. The system comprises a thermal imaging sensor and optics, and two interchangeable band-pass uncooled filters located between the optics and the detector. A first filter transmits electromagnetic radiation in a first spectral band that includes the known spectral band and blocks electromagnetic radiation for other spectral bands. A second filter transmits only electromagnetic radiation in a second spectral band in which the substance has no detectable signature. The system also includes a processor for processing the images to obtain a reconstructed fused image involving using one or more transforms aimed at obtaining similarity between one or more images acquired with the first filter and one or more images acquired with the second filter before reconstructing the fused image.