Gas Detection via Spectral Spatial Misregistration
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Solution Overview
Problem
Conventional spectral imaging methods for gas detection face challenges due to optical effects such as spatial misregistration, which hinder accurate gas identification and concentration measurement.
Innovation Solution
The method employs spatial misregistration as an optical effect to generate a spatial displacement expression by detecting misalignment between spectral images, using a reference spectral image and a library of reference spatial displacement expressions to identify gases and determine their concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spectral imaging methods are used for gas detection, then the system structure is relatively simple, but spatial misregistration occurs which reduces measurement precision and gas identification accuracy
Solution Approach 1:
The patent converts the harmful spatial misregistration effect into a beneficial feature for gas detection. By using the spatial displacement caused by atmospheric absorption as a diagnostic signal, the system identifies gases based on their characteristic displacement patterns rather than treating misregistration as a mere error to be corrected. This approach transforms an optical defect into a useful detection mechanism.
Solution Approach 2:
The patent changes the approach from correcting spatial misregistration to utilizing it by transforming the problem parameters. Instead of attempting to achieve perfect spatial alignment, the system measures spatial displacement as a function of wavelength and uses this displacement pattern to identify gases. This parameter transformation converts a nuisance into a detection feature.
2Measurement precision
If spatial misregistration is corrected through conventional methods, then measurement precision may improve slightly, but the processing time increases and complexity increases
Solution Approach 1:
The patent inverts the conventional approach by not attempting to correct spatial misregistration but instead using the misregistration pattern itself for gas identification. This inversion eliminates the time-consuming correction step while maintaining or improving detection accuracy, as the spatial displacement contains unique spectral signatures of different gases.
3Reliability
If multiple spectral images are sampled and processed to detect spatial misregistration, then gas identification accuracy improves, but device complexity and processing requirements increase
Solution Approach 1:
The patent takes the unavoidable spatial misregistration that occurs during multi-spectral imaging and converts it into a useful signal. Rather than requiring complex correction algorithms, the system measures the spatial displacement of absorption features across wavelengths and uses this displacement pattern as the basis for reliable gas identification, simplifying the processing requirements.
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
This approach enables accurate remote identification and concentration determination of gases by leveraging spatial misregistration, improving detection accuracy and reducing false alarms, especially in complex environments like urban areas and airborne scenarios.
Implementation Method 1
Gas Discriminating Gas Detector System and Method teaches an overview of gas detection systems based on measurement of absorption of electromagnetic radiation by a gas of interest
Implementation Method 2
sampling a plurality of spectral images of a scene, each spectral image being sampled at a different wavelength; providing a reference spectral image; generating a spatial displacement expression by detecting the spatial misregistration in at least one region of the spectral images between the reference spectral image and at least one of the plurality of spectral images
Data Source
AI summary
In accordance with one embodiment, a method for remote identification of at least one gas includes sampling a plurality of spectral images of a scene wherein each spectral image is sampled at a different wavelength, providing a reference spectral image, and generating a spatial displacement expression by detecting the spatial misregistration in at least one region of the spectral images between the reference spectral image and at least one of the plurality of spectral images. At least one reference spatial displacement expression is provided corresponding to at least one gas, and at least one identification process is implemented to identify at least one gas. The identification process employs the generated spatial displacement expression and the at least one reference spatial displacement expression. Optionally the reference image is one of the sampled spectral images, the reference spatial displacement expression is provided from a general or adapted library, and the concentration of the gas can be determined.