Open AccessSimultaneous and interference-free measurements of temperature and C2H4 concentration using a single tunable diode laser at 162 µm
Author(s) -
Guangzhen Gao,
Ting Zhang,
Gang Zhang,
Xin Liu,
Tong Cai
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.017887
Subject(s) - tunable diode laser absorption spectroscopy , materials science , absorption (acoustics) , laser , absorption spectroscopy , optics , interference (communication) , extinction (optical mineralogy) , temperature measurement , wavelength , diode , spectroscopy , combustion , analytical chemistry (journal) , tunable laser , optoelectronics , chemistry , physics , telecommunications , channel (broadcasting) , organic chemistry , chromatography , quantum mechanics , computer science , composite material
In the tunable diode laser absorption spectroscopy-based diagnostics, the absorption of the measured target species may be influenced by the interference absorption from other vapor-phase species and the extinction from particles and liquid droplets, especially at high temperatures and pressures. Here, we report the first application (to our knowledge) of a differential absorption diagnostic for interference-free, simultaneous measurement of temperature and ethylene concentration using a single distributed-feedback diode laser near 1.62 μm. According to the detailed study of the C 2 H 4 spectra in this region, two wavelength pairs are chosen to measure the temperature based on six selection criteria. C 2 H 4 concentration is measured by one of the selected wavelength pairs with higher differential absorption. To validate the developed system, experiments are performed in a well-controlled heated static cell at a range of temperatures (300-900 K) and pressures (1-6 atm). The measurement accuracies for temperature and ethylene concentration are 1.83% and 1.65%, respectively, over the considered ranges. The precision, stability, and detection limit are also analyzed to validate the system's performance. This system can potentially be applied in a variety of combustion applications.