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Sensors, Vol. 18, Pages 2050: Sensitive Spectroscopy of Acetone Using a Widely Tunable External-Cavity Quantum Cascade Laser

Sensors, Vol. 18, Pages 2050: Sensitive Spectroscopy of Acetone Using a Widely Tunable External-Cavity Quantum Cascade Laser

Sensors doi: 10.3390/s18072050

Authors: Faisal Nadeem Julien Mandon Amir Khodabakhsh Simona M. Cristescu Frans J. M. Harren

We employed a single-mode, widely tunable (~300 cm−1) external-cavity quantum cascade laser operating around 8 µm for broadband direct absorption spectroscopy and wavelength modulation spectroscopy where a modulation frequency of 50 kHz was employed with high modulation amplitudes of up to 10 GHz. Using a compact multipass cell, we measured the entire molecular absorption band of acetone at ~7.4 µm with a spectral resolution of ~1 cm−1. In addition, to demonstrate the high modulation dynamic range of the laser, we performed direct absorption (DAS) and second harmonic wavelength modulation spectroscopy (WMS-2f) of the Q-branch peak of acetone molecular absorption band (HWHM ~10 GHz) near 1365 cm−1. With WMS-2f, a minimum detection limit of 15 ppbv in less than 10 s is achieved, which yields a noise equivalent absorption sensitivity of 1.9 × 10−8 cm−1 Hz−1/2.

Authors:   Nadeem, Faisal ; Mandon, Julien ; Khodabakhsh, Amir ; Cristescu, Simona M.; Harren, Frans J. M.
Journal:   Sensors
Volume:   18
edition:   7
Year:   2018
Pages:   2050
DOI:   10.3390/s18072050
Publication date:   27-Jun-2018
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  • Single
  • Simona
  • detection limit
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