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Sensors 2018, 18(1), 122; https://doi.org/10.3390/s18010122

High-Power DFB Diode Laser-Based CO-QEPAS Sensor: Optimization and Performance

1
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China
2
Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA
*
Authors to whom correspondence should be addressed.
Received: 12 December 2017 / Revised: 31 December 2017 / Accepted: 2 January 2018 / Published: 4 January 2018
(This article belongs to the Section Chemical Sensors)
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Abstract

A highly sensitive carbon monoxide (CO) trace gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) was demonstrated. A high-power distributed feedback (DFB), continuous wave (CW) 2.33 μm diode laser with an 8.8 mW output power was used as the QEPAS excitation source. By optimizing the modulation depth and adding an optimum micro-resonator, compared to a bare quartz tuning fork (QTF), a 10-fold enhancement of the CO-QEPAS signal amplitude was achieved. When water vapor acting as a vibrational transfer catalyst was added to the target gas, the signal was further increased by a factor of ~7. A minimum detection limit (MDL) of 11.2 ppm and a calculated normalized noise equivalent absorption (NNEA) coefficient of 1.8 × 10−5 cm−1W/√Hz were obtained for the reported CO-QEPAS sensor. View Full-Text
Keywords: QEPAS; carbon monoxide; high power diode laser; gas sensor QEPAS; carbon monoxide; high power diode laser; gas sensor
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Ma, Y.; Tong, Y.; He, Y.; Yu, X.; Tittel, F.K. High-Power DFB Diode Laser-Based CO-QEPAS Sensor: Optimization and Performance. Sensors 2018, 18, 122.

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