Peltola Jari, Vainio Markku, Hieta Tuomas, Uotila Juho, Sinisalo Sauli, Metsälä Markus, Siltanen Mikael, Halonen Lauri
Laboratory of Physical Chemistry, Department of Chemistry, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Finland.
Opt Express. 2013 Apr 22;21(8):10240-50. doi: 10.1364/OE.21.010240.
Highly sensitive cantilever-enhanced photoacoustic detection of hydrogen cyanide and methane in the mid-infrared region is demonstrated. A mid-infrared continuous-wave frequency tunable optical parametric oscillator was used as a light source in the experimental setup. Noise equivalent detection limits of 190 ppt (1 s) and 65 ppt (30 s) were achieved for HCN and CH(4), respectively. The normalized noise equivalent absorption coefficient is 1.8 × 10(-9) W cm(-1) Hz(-1/2).
本文展示了在中红外区域对氰化氢和甲烷进行高灵敏度悬臂增强光声检测。实验装置中使用了一个中红外连续波频率可调谐光学参量振荡器作为光源。对于HCN和CH₄，分别实现了190 ppt（1秒）和65 ppt（30秒）的噪声等效检测限。归一化噪声等效吸收系数为1.8×10⁻⁹ W cm⁻¹ Hz⁻¹/²。
