A sensitive spectroscopic sensor based on a hollow-core fiber-coupled quantum cascade laser (QCL) emitting at 10.54 μm and quartz enhanced photoacoustic spectroscopy (QEPAS) technique is reported. The design and realization of mid-IR fiber and coupler optics has ensured single-mode QCL beam delivery to the QEPAS sensor. The collimation optics was designed to produce a laser beam of significantly reduced beam size and waist so as to prevent illumination of the quartz tuning fork and microresonator tubes. SF6 was selected as the target gas. A minimum detection sensitivity of 50 parts per trillion in 1 s was achieved with a QCL power of 18 mW, corresponding to a normalized noise-equivalent absorption of 2.7×10^−10   W⋅cm^−1/Hz^1/2.

Part-per-trillion level SF6 detection using a quartz enhanced photoacoustic spectroscopy based sensor with single-mode fiber-coupled quantum cascade laser excitation / Spagnolo, Vincenzo Luigi; Patimisco, P; Borri, S; Scamarcio, G; Bernacki, B. E.; Kriesel, J.. - In: OPTICS LETTERS. - ISSN 0146-9592. - 37:21(2012), pp. 460-462. [10.1364/OL.37.004461]

Part-per-trillion level SF6 detection using a quartz enhanced photoacoustic spectroscopy based sensor with single-mode fiber-coupled quantum cascade laser excitation

SPAGNOLO, Vincenzo Luigi;Patimisco P;
2012-01-01

Abstract

A sensitive spectroscopic sensor based on a hollow-core fiber-coupled quantum cascade laser (QCL) emitting at 10.54 μm and quartz enhanced photoacoustic spectroscopy (QEPAS) technique is reported. The design and realization of mid-IR fiber and coupler optics has ensured single-mode QCL beam delivery to the QEPAS sensor. The collimation optics was designed to produce a laser beam of significantly reduced beam size and waist so as to prevent illumination of the quartz tuning fork and microresonator tubes. SF6 was selected as the target gas. A minimum detection sensitivity of 50 parts per trillion in 1 s was achieved with a QCL power of 18 mW, corresponding to a normalized noise-equivalent absorption of 2.7×10^−10   W⋅cm^−1/Hz^1/2.
2012
Part-per-trillion level SF6 detection using a quartz enhanced photoacoustic spectroscopy based sensor with single-mode fiber-coupled quantum cascade laser excitation / Spagnolo, Vincenzo Luigi; Patimisco, P; Borri, S; Scamarcio, G; Bernacki, B. E.; Kriesel, J.. - In: OPTICS LETTERS. - ISSN 0146-9592. - 37:21(2012), pp. 460-462. [10.1364/OL.37.004461]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/959
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