Adaptive Dual-Comb Spectroscopy for Remote Methane Leak Detection

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Solution Overview

Problem

Existing gas leak detection technologies pose safety risks to operators due to the need for close proximity to leak sources, and they are limited in detecting methane emissions remotely and efficiently.

Innovation Solution

A dual-comb spectroscopy (DCS) system using two optical frequency combs to remotely sense trace gases with high sensitivity, capable of detecting leaks over a kilometer away, and includes data-processing methods to enhance robustness and portability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If optical gas imaging (OGI) or portable instruments are used for leak detection, then leak detection capability is achieved, but operator safety is compromised due to the need for close proximity to leak sources

Engineering Contradiction:

Improveleak detection capabilityVSAvoidoperator safety

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent transitions from close-proximity detection to remote detection by utilizing optical remote sensing techniques. The system employs frequency comb spectroscopy to detect methane emissions from a distance, eliminating the need for operators to approach leak sources closely while maintaining detection capability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent introduces an optical intermediary system that bridges the gap between the operator and the leak source. By using optical frequency combs and remote sensing, the system allows detection without direct physical proximity, with the optical field serving as the intermediary carrier of information.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If manual leak surveys are conducted by operators, then comprehensive inspection is achieved, but time consumption and operational efficiency are reduced

Engineering Contradiction:

Improveinspection comprehensivenessVSAvoidsurvey time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements an autonomous remote sensing system that performs leak detection without requiring manual operator intervention for each survey point. The system can automatically scan and identify methane emissions, reducing the time and labor required for comprehensive inspections while maintaining inspection thoroughness.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical survey methods with optical remote sensing technology. Instead of operators physically moving to each inspection point, the system uses optical frequency comb spectroscopy to remotely detect and map methane emissions, significantly reducing survey time while maintaining comprehensive coverage.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If infrared cameras are used for optical gas imaging, then methane leak detection is achieved, but performance is affected by weather conditions and background emissivities

Engineering Contradiction:

Improvemethane detection accuracyVSAvoidweather condition sensitivity

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent changes the detection parameter from broadband infrared imaging to narrowband frequency comb spectroscopy. By using specific frequency combs that target methane absorption lines, the system achieves selective detection that is less sensitive to background emissivities and weather conditions, improving both accuracy and environmental adaptability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs tunable frequency comb spectroscopy that can dynamically adjust detection parameters based on environmental conditions. The system can adapt its spectral range and resolution to compensate for weather effects, maintaining consistent performance across varying environmental conditions.

Inventive Principle:

Principle #15Dynamics

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

The DCS system minimizes operator exposure to safety hazards by detecting gas leaks autonomously at a distance, providing rapid leak identification and reducing the need for manual surveys, while maintaining reliability and efficiency across various weather conditions.

Implementation Method 1

a first reference laser is locked to a first atomic or molecular transition with a known transition frequency... spectroscopically measuring a gaseous sample with the first and second spectra to detect the presence of the target gas in the gaseous sample

Methodology Applied

Scientific EffectAbsorption spectroscopy: Absorption Spectroscopy

Data Source

PatentUS12578227B2Dual comb spectroscopy under no-walking condition

Publication Date: 2026.03.17 THE REGENTS OF THE UNIVERSITY OF COLORADO

AI summary

A method for adaptive dual frequency-comb spectroscopy includes repeatedly (i) recording a single interferogram with a dual frequency-comb spectrometer, (ii) averaging the single interferogram into an averaged interferogram, and (iii) determining a signal-to-noise ratio (SNR) of the averaged interferogram, until the SNR of the averaged interferogram exceeds a SNR threshold. In certain embodiments, determining the SNR includes determining a signal amplitude of a center burst of the averaged interferogram and determining a noise level of the averaged interferogram from data points of the averaged interferogram located away from the center burst. In certain embodiments, determining the SNR includes Fourier transforming the averaged interferogram into a frequency spectrum and numerically integrating the frequency spectrum.