论文信息 - Acetylene measurement using quantum cascade lasers at 14μm

Acetylene measurement using quantum cascade lasers at 14μm

The monitoring of acetylene (C2H2) concentrations is important for many chemical processes. Industrial trace gas measurements are usually performed using gas chromatographs (GC) which have time constants of several minutes. Optical analyzers are expected to yield faster response times with lower maintenance costs. We investigated the use of quantum cascade laser (QCL) spectroscopy in the 14μm range for the sensitive and fast detection of C2H2. This spectral range is favorable, as it avoids spectral interferences by other components which could be present in typical process gases. We developed new custom DFB QCLs and characterized their spectral properties. We determined the performance of our QCL gas analyzer setup and demonstrate a noise equivalent concentration of 10 ppb in 20 s average time.

[1] Stefan Lundqvist,et al. Mid Infrared Tunable Diode Laser Spectrometer for Sensitive Detection of Acetylene , 2010 .

[2] Passage Maximilien-de-Meuron,et al. Comparison of cw and pulsed operation with a TE-cooled quantum cascade infrared laser for detection of nitric oxide at 1900 cm −1 , 2006 .

[3] E. Normand,et al. Highly sensitive detection of trace gases using the time-resolved frequency downchirp from pulsed quantum-cascade lasers , 2003 .

[4] Jie Zhu,et al. Development of a Rapid On-Line Acetylene Sensor for Industrial Hydrogenation Reactor Optimization Using Off-Axis Integrated Cavity Output Spectroscopy , 2008, Applied spectroscopy.

[5] John U. White. Long Optical Paths of Large Aperture , 1942 .

[6] Marcus Wolff,et al. Quantum cascade laser linewidth investigations for high resolution photoacoustic spectroscopy. , 2009, Applied optics.

[7] John Tulip,et al. Sensitive detection of ammonia and ethylene with a pulsed quantum cascade laser using intra and interpulse spectroscopic techniques , 2009 .

[8] M. Zahniser,et al. Sub-part-per-billion detection of nitric oxide in air using a thermoelectrically cooled mid-infrared quantum cascade laser spectrometer , 2002 .

[9] Armin Lambrecht,et al. Fast gas spectroscopy using pulsed quantum cascade lasers , 2003 .

[10] David D. Nelson,et al. Pulsed quantum cascade laser instrument with compact design for rapid, high sensitivity measurements of trace gases in air , 2008 .