New improvements in methane detection using a Helmholtz resonant photoacoustic laser sensor: A comparison between near-IR diode lasers and mid-IR quantum cascade lasers
| Autor: | Georges Durry, Lilian Joly, Agnès Grossel, Bertrand Parvitte, Virginie Zeninari, D. Courtois |
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| Přispěvatelé: | Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2006 |
| Předmět: |
Light
Spectrophotometry Infrared Optical power 02 engineering and technology 01 natural sciences 7. Clean energy Analytical Chemistry law.invention 010309 optics Optics law 0103 physical sciences Instrumentation Spectroscopy Helmholtz resonator Diode [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Spectrometer business.industry Chemistry Air Lasers Spectrum Analysis Acoustics 021001 nanoscience & nanotechnology Laser Atomic and Molecular Physics and Optics Quantum dot laser Quantum Theory Optoelectronics Astrophysics::Earth and Planetary Astrophysics 0210 nano-technology business Quantum cascade laser Methane Tunable laser |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy [1994-...] Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy [1994-..], Elsevier, 2006, 63, pp.1021-1028. ⟨10.1016/j.saa.2005.11.002⟩ Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy [1994-..], 2006, 63, pp.1021-1028. ⟨10.1016/j.saa.2005.11.002⟩ |
| ISSN: | 1386-1425 1873-3557 |
| Popis: | Atmospheric methane was detected by combining a photoacoustic (PA) sensor with several lasers emitting in both the near- and mid-infrared spectral ranges to check the achievable detection limits. The PA spectrometer is based on differential Helmholtz resonance. Near-infrared telecommunication-type laser diodes of increasing power, from Sensors Unlimited Inc. and Anritsu, were first used to scan the 2 nu(3) band of CH(4) near 1.65 microm. The best achieved detection limit is 0.15 ppm of methane at atmospheric pressure and with a 1s integration time. The PA sensor was then operated in conjunction with a quantum cascade laser from Alpes Lasers emitting near 7.9 microm on the nu(4) band of CH(4). The achieved detection limit is then of 3 ppb. The dramatic improvement in the detection limit obtained with the QC laser is due to the stronger optical power as well as to the capability of reaching the fundamental bands of methane lying in the mid-infrared spectral range. |
| Databáze: | OpenAIRE |
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