High-Performance Atmospheric Carbon Dioxide Analyzer

High-performance carbon dioxide detection is a critical component of the Department of Energy's greenhouse gas measurement strategy. However, high sensitivity, precision, and selectivity, in the presence of atmospheric contaminants, are a challenge to optical detection methods. In this project, an emerging, ultra-trace photoacoustic spectrometer, initially developed for use with simple laser diodes, will be coupled with an infrared laser-enhancement cavity to provide exceptional sensitivity and selectivity to the measurement of atmospheric carbon dioxide. The laser-enhancement technique will employ a broadly tunable, high-power solid-state laser operating at infrared wavelengths, allowing detection of multiple species. In Phase I, a bench-top, diode-pumped solid state laser, operating with broad wavelength tuning in the infrared region, will be designed and built. The laser will serve as the platform for a cavity-enhanced photoacoustic spectrometer. The high power and broad wavelength tuning of the solid state laser, combined with photoacoustic detection, will enable parts-per-billion detection of carbon dioxide. Commercial Applications And Other Benefits as described by the Applicant: The technology should be applicable to the detection of many trace species in addition to carbon dioxide, for much less cost than commercial systems that only target one species. Specific areas of application include biomedical breath diagnostics, process gas analysis, occupational safety, and homeland security