Tunable laser spectroscopy combined with novelphotoacoustic technology for hand-held low-ppb gas analyzers in various applications

摘要

A versatile and modular technology suitable for several gas measurement applications requiring ppbrnlevel sensitivity and high selectivity in a hand-held size is presented. The proposed miniaturizedrncantilever enhanced photoacoustic detection scheme is combined with different types of NIR or MIRrntunable laser sources. Several sources can be combined in the same miniaturized measurement cellrnand the sources are selected by the application requirements. The use of tunable laser sourcesrnprovides the possibility to use high-resolution spectroscopy in order to achieve high selectivity in multigasrnanalysis. The novel optical cantilever microphone provides high sensitivity in a miniaturizedrnrealization.