Photoacoustic Spectroscopy with Quantum Cascade Lasers for Trace Gas Detection

Sensors

Angela Elia¹  Cinzia Di Franco²  Pietro Mario Lugarಠ

[1] id="af1-sensors-06-01411">LIT ³ CNR-INFM Regional Laboratory, Department of Physics - University of Bari, Via Amendola 173, I-70126 Bari, Ita

关键词: photoacoustic spectroscopy;    quantum cascade laser;    trace gas detection;   

DOI  :  10.3390/s6101411

来源: mdpi

【 摘 要 】

Various applications, such as pollution monitoring, toxic-gas detection, non invasive medical diagnostics and industrial process control, require sensitive and selective detection of gas traces with concentrations in the parts in 10⁹ (ppb) and sub-ppb range. The recent development of quantum-cascade lasers (QCLs) has given a new aspect to infrared laser-based trace gas sensors. In particular, single mode distributed feedback QCLs are attractive spectroscopic sources because of their excellent properties in terms of narrow linewidth, average power and room temperature operation. In combination with these laser sources, photoacoustic spectroscopy offers the advantage of high sensitivity and selectivity, compact sensor platform, fast time-response and user friendly operation. This paper reports recent developments on quantum cascade laser-based photoacoustic spectroscopy for trace gas detection. In particular, different applications of a photoacoustic trace gas sensor employing a longitudinal resonant cell with a detection limit on the order of hundred ppb of ozone and ammonia are discussed. We also report two QC laser-based photoacoustic sensors for the detection of nitric oxide, for environmental pollution monitoring and medical diagnostics, and hexamethyldisilazane, for applications in semiconductor manufacturing process.

【 授权许可】

Unknown   
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