Wavelength-Scanned Cavity Ring Down Spectroscopy can combine the ppt sensitivity and species discrimination of separation science with the speed and simplicity of optical technology.
Applications continue to grow and diversify for the detection and analysis of trace amounts of small gas-phase species. Examples include moisture and carbon dioxide in feedstock gases, ammonia and moisture in gases used in the semiconductor industry, and hydrogen sulfide in petrochemical gases. While there are several established technologies for trace gas analysis, each has significant inherent limitations in terms of speed or sensitivity; also, there are often practical issues, such as the need for a skilled operator, and frequent maintenance or re-calibration. However, a new technology now delivers species selectivity and parts-per-trillion sensitivity, combined with real-time speed, simplicity, no sample preparation requirements and no need for frequent re-calibration. This article explains this technique and shows how it delivers these key advantages in selected applications.
Real-Time Atmospheric Monitoring of Stable Isotopes and Trace Greenhouse Gases
Researchers investigating global climate change need extremely precise and accurate measurements of greenhouse gases (principally CO2 and CH4, including the stable isotopes of carbon) to develop better models of the carbon cycle. Field results indicate that Picarro analyzers meet or exceed the requirements of the atmospheric monitoring applications, and they do so without the need for sample conditioning. The analyzers maintain their calibration for extended periods of time, reducing the need for calibration and dramatically reducing maintenance costs. The extreme accuracy and stability of the analyzers is certain to facilitate their deployment in networks.