We report on a spectroscopic technique named intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) employed for sensitive trace-gas detection in the mid-infrared spectral region. It is based on a combination of QEPAS with a buildup optical cavity. The sensor includes a distributed feedback quantum cascade laser emitting at 4.33 lm. We achieved a laser optical power buildup factor of 500, which corresponds to an intracavity laser power of 0.75 W. CO2 has been selected as the target molecule for the I-QEPAS demonstration. We achieved a detection sensitivity of 300 parts per trillion for 4 s integration time, corresponding to a noise equivalent absorption coefficient of 1.4108 cm1 and a normalized noise-equivalent absorption of 3.21010 W cm1 Hz1/2.
Intracavity quartz-enhanced photoacoustic sensor / Borri, S., Patimisco, P., Galli, I., Mazzotti, D., Giusfredi, G., Akikusa, N., Yamanishi, M., Scamarcio, G., De Natale, P., Spagnolo, V.L.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 104:9(2014). [10.1063/1.4867268]
Intracavity quartz-enhanced photoacoustic sensor
Patimisco P.;SPAGNOLO, Vincenzo Luigi
2014
Abstract
We report on a spectroscopic technique named intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) employed for sensitive trace-gas detection in the mid-infrared spectral region. It is based on a combination of QEPAS with a buildup optical cavity. The sensor includes a distributed feedback quantum cascade laser emitting at 4.33 lm. We achieved a laser optical power buildup factor of 500, which corresponds to an intracavity laser power of 0.75 W. CO2 has been selected as the target molecule for the I-QEPAS demonstration. We achieved a detection sensitivity of 300 parts per trillion for 4 s integration time, corresponding to a noise equivalent absorption coefficient of 1.4108 cm1 and a normalized noise-equivalent absorption of 3.21010 W cm1 Hz1/2.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
