Multispecies Absorption Spectroscopy Platform for Co-Emitted Trace Gases
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Solution Overview
Problem
Existing systems struggle to efficiently measure multiple trace gas species, such as methane and carbon dioxide, simultaneously and accurately, particularly in downwind emissions from sources like natural gas extraction and livestock farming, which are crucial for understanding emission sources and quantifying flux.
Innovation Solution
A multispecies measurement platform using absorption spectroscopy with tunable diode laser absorption spectroscopy (TDLAS) and optical cavities, combined with photovoltaic detectors, to measure co-emitted gases like methane and carbon dioxide, employing various laser and detector configurations to detect and quantify multiple gas species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate measurement systems are used for different trace gas species, then measurement precision for each species is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal measurement platform that can detect multiple trace gas species (methane, carbon dioxide, and other VOCs) using a single integrated system. The system employs a broadband light source combined with tunable filters or spectral scanning capabilities, allowing one measurement system to perform the function of multiple specialized systems, thereby reducing overall device complexity while maintaining measurement precision for each gas species
Solution Approach 2:
The patent merges multiple measurement functions into a single integrated platform by combining light sources, optical cavities, and detectors into one system. The optical cavity enhances the absorption signal for all target gases simultaneously, and the detector system is configured to resolve multiple spectral signatures, effectively combining what would traditionally require separate measurement instruments into a unified device
2Measurement precision
If optical path length is increased to improve detection sensitivity, then measurement precision improves, but device complexity and size increase
Solution Approach 1:
The patent employs an optical cavity with mirrored surfaces that create a resonant or multi-pass optical path. The light travels back and forth between mirrors, effectively increasing the absorption path length by a factor of 100 or more within a compact volume. This curved/optical-resonator approach achieves long effective path lengths without requiring long linear device dimensions, thereby improving detection sensitivity while keeping the device compact and manageable in complexity
Solution Approach 2:
The patent transforms the measurement from a simple linear path into a multi-dimensional optical resonance mode within the cavity. By utilizing the standing wave patterns and resonant modes of the optical cavity, the system achieves enhanced interaction length between light and gas molecules without proportionally increasing the physical device size, thus improving sensitivity while controlling complexity
3Adaptability or versatility
If multiple light sources are used to cover different wavelength ranges, then adaptability to detect different gas species improves, but device complexity increases
Solution Approach 1:
The patent employs a universal light source that can operate across a broad spectral range or can be tuned to different wavelengths. This single light source replaces multiple specialized sources, providing the adaptability to detect different gas species (methane at 1.65 μm, carbon dioxide at 2.0 μm, and other VOCs) while maintaining a simplified device architecture with fewer components
Solution Approach 2:
The patent implements a dynamically tunable light source or filter system that can adjust its output wavelength or spectral distribution based on the target gas species. This dynamic capability allows the system to adapt to different measurement requirements without requiring multiple fixed-wavelength sources, thereby achieving versatility while reducing device complexity through a single reconfigurable component
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 simultaneous and accurate detection of multiple trace gases, allowing for the determination of emission sources and quantification of flux, improving efficiency assessments in processes like biogas production and combustion source performance.
Implementation Method 1
one or more light sources configured to emit at least one of: a specified wavelength of light and a band of wavelengths of light into the one or more optical cavities
Implementation Method 2
one or more photovoltaic detectors configured to receive the emitted light that has traveled one or more path lengths
Implementation Method 3
the emitted light travels one or more path lengths over one or more distances from the light source
Data Source
AI summary
Systems, devices, and methods including one or more optical cavities; one or more light sources configured to emit a specified wavelength or band of wavelengths of light; and one or more photovoltaic detectors configured to receive the emitted light that has traveled over one or more path lengths, where the one or more photovoltaic detectors are configured to detect at least one of: a first trace gas species and a second trace gas species.