Cavity-Enhanced Spectroscopy for Atmospheric Trace Gas Detection
Summary
Cavity-enhanced spectroscopy exploits multiple reflections of light between highly reflective mirrors to increase the effective path length through an atmospheric sample, thereby amplifying weak absorption signals from trace gases. Techniques such as cavity ring-down spectroscopy (CRDS) and cavity-enhanced absorption spectroscopy (CEAS) achieve detection of species at parts-per-billion or even parts-per-trillion levels. Advances in broadband light sources, laser-driven lamps and compact optical cavities have enabled simultaneous measurement of key pollutants and reactive intermediates—nitrogen dioxide, ozone, nitrous acid, nitrate radicals and small organic carbonyls—in laboratory, ground-based and airborne platforms. Sensitive, rapid measurements inform our understanding of photochemical ozone production, radical budgets and the emission sources of biogenic and anthropogenic compounds. Recent developments in open-path configurations and novel detection schemes address challenges of humidity interference, spectral congestion and field deployability. By delivering high accuracy and temporal resolution, cavity-enhanced methods have become indispensable for air quality monitoring, climate studies and validation of atmospheric models worldwide.
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Cavity-Enhanced Spectroscopy for Atmospheric Trace Gas Detection publication trend
The graph below shows the total number of articles in cavity-enhanced spectroscopy for atmospheric trace gas detection across all publications each year (not limited to Nature Index journals).
Technical terms
Cavity-enhanced absorption spectroscopy (CEAS): A technique that increases optical path length by trapping light between mirrors to amplify weak molecular absorption signals.
Optical cavity: A pair of highly reflective mirrors facing each other that confines light, enabling multiple passes through a gas sample.
Effective path length: The equivalent distance travelled by light within a cavity, determined by mirror reflectivity and geometric length.
Detection limit (1-σ): The smallest concentration at which a signal can be distinguished from noise with 68 % confidence.
Incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS): A CEAS variant using a broadband light source, such as LEDs or lamps, to detect multiple gases simultaneously over a wide spectral range.
References
- Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) Coupled with an Interferometer for On-Band and Off-Band Detection of Glyoxal. Toxics (2023).
- Ozone Detection via Deep-Ultraviolet Cavity-Enhanced Absorption Spectroscopy with a Laser Driven Light Source. Sensors (2023).
- Intercomparison of NO3 under Humid Conditions with Open-Path and Extractive IBBCEAS in an Atmospheric Reaction Chamber. Remote Sensing (2023).
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