Broadband Gas Analysis via Spectral Modulation
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Solution Overview
Problem
Existing gas analysis devices using optical methods face challenges with high production costs and technical difficulties in manufacturing narrow bandwidth filters, limited versatility, and inability to distinguish gaseous species with overlapping absorption spectral bands, making them unsuitable for compact and inexpensive gas detectors.
Innovation Solution
A method and device that utilize a light source with a broad illumination spectrum and a light sensor detecting radiation in a continuous spectral band, allowing for the estimation of multiple gaseous species without the need for a multiband filter, by varying the illumination spectrum through temperature modulation or using multiple elementary light sources, and processing the detected intensities to determine species concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multiband filter with narrow bandwidths is used to detect specific gaseous species, then the detection precision for target gases is improved, but the manufacturing cost and technical difficulty increase significantly
Solution Approach 1:
The patent extracts the spectral filtering function from a complex multiband filter and implements it through software processing of broadband spectral data. Instead of using physical narrow-band filters, the system captures full-spectrum information and selectively analyzes absorption features computationally, thereby eliminating the manufacturing complexity of precision optical filters while maintaining detection precision.
Solution Approach 2:
The patent replaces the mechanical/optical filtering system with a computational approach. Rather than using physical filters to separate spectral bands, the system uses algorithms to process broadband spectral measurements and extract concentration information for multiple gaseous species, substituting mechanical filtering with digital signal processing.
2Measurement precision
If a multiband filter is used to detect specific gaseous species, then the detection precision is improved, but the device versatility decreases
Solution Approach 1:
The patent implements a universal gas detection system using a single broadband light source and spectrometer that can detect multiple gaseous species across different spectral ranges. The system is configured to analyze absorption features of various gases (CO, CO2, CH4, H2O, etc.) simultaneously, making the device adaptable to different gas mixtures without requiring filter changes or reconfiguration.
Solution Approach 2:
The patent removes the limitation of fixed spectral bands imposed by physical filters and extracts the ability to selectively analyze any spectral region through software. The system captures the complete spectrum and uses computational methods to isolate absorption features of interest, enabling versatile detection of different gaseous species with the same hardware configuration.
3Measurement precision
If a multiband filter is used for gas analysis, then the detection of target species is improved, but the ability to separate and discriminate species with overlapping absorption bands is lost
Solution Approach 1:
The patent replaces physical spectral filtering with computational spectral analysis. By capturing the complete absorption spectrum and applying mathematical algorithms, the system can resolve overlapping absorption bands of different gaseous species. The computational approach decomposes composite absorption features into individual species contributions, enabling discrimination that is impossible with fixed narrow-band filters.
Solution Approach 2:
The patent transitions from one-dimensional spectral filtering (selecting specific wavelength bands) to two-dimensional spectral analysis (analyzing absorption patterns across the entire spectrum). This dimensional expansion provides additional information for distinguishing between species with overlapping absorption features by examining the full spectral fingerprint of each gas.
4Adaptability or versatility
If multiple filters are successively interposed between the light source and gas, then the detection of different gaseous species is enabled, but the device complexity and mechanical requirements increase
Solution Approach 1:
The patent extracts the spectral selection function from multiple physical filters and implements it through computational processing. The system uses a single broadband light source and spectrometer to capture all spectral information, then applies software algorithms to analyze absorption features of different gaseous species, eliminating the need for mechanical filter switching mechanisms.
Solution Approach 2:
The patent replaces the mechanical system of filter switching with a computational system. Instead of physically interposing different filters to detect various species, the system processes spectral data algorithmically to identify and quantify multiple gaseous components, thereby eliminating mechanical complexity while maintaining multi-species detection capability.
5Measurement precision
If prior knowledge of gaseous species is required to select filters, then the detection precision for known species is improved, but the ease of operation decreases
Solution Approach 1:
The patent replaces the need for operator knowledge of spectral characteristics with automated computational analysis. The system's processing algorithms automatically identify absorption features and assign them to appropriate gaseous species based on reference spectral data, eliminating the requirement for operators to have specialized knowledge for selecting appropriate filters or detection parameters.
Solution Approach 2:
The system performs self-identification of gaseous species through automated spectral analysis. The processing unit compares measured absorption spectra with reference data and automatically determines the presence and concentration of various gases without requiring operator intervention or prior knowledge, making the device easy to operate for users with varying levels of expertise.
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 simple, inexpensive, and adaptable gas analysis capable of addressing different gaseous species, including those with overlapping spectral bands, without the need for specific filters, allowing for the determination of multiple species in a mixture using a single device.
Implementation Method 1
The use of optical methods for gas analysis is quite common. Devices exist that allow the composition of a gas to be determined based on the fact that the species composing a gas exhibit different spectral absorption properties.
Implementation Method 2
knowing the spectral absorption band of a gaseous species, its concentration can be determined by estimating the absorption of light passing through the gas, using Beer-Lambert's law.
Data Source
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AI summary
The invention relates to a method for analysing gas by an optical method, according to which a gas sample, comprising gaseous species for which it is desired to determine the quantity, is subjected to an illuminating radiation generated by a light source. The method comprises detecting a radiation having crossed the gas, by means of a light sensor. According to the invention, the light source produces different successive illuminations, such that at each illumination, the spectrum of the illuminating radiation varies. During each illumination, the intensity of the radiation detected by the light sensor is recorded. A processor can estimate a quantity of each gaseous species as a function of the respective intensities measured during each illumination. The invention also relates to a gas analysis device implementing the method.