The temperature measurement research for high-speed flow based on tunable diode laser absorption spectroscopy

2013 ◽  
Author(s):  
Yue Di ◽  
Yi Jin ◽  
Hong-liang Jiang ◽  
Chao Zhai
Keyword(s):  
Temperature Measurement ◽  
Diode Laser ◽  
Absorption Spectroscopy ◽  
High Speed ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
High Speed Flow ◽  
Laser Absorption ◽  
Speed Flow ◽  
Diode Laser Absorption

scholarly journals Measurement of Temperature and H2O Concentration in Premixed CH4/Air Flame Using Two Partially Overlapped H2O Absorption Signals in the Near Infrared Region

2021 ◽  
Vol 11 (8) ◽  
pp. 3701
Author(s):  
Sunghyun So ◽  
Nakwon Jeong ◽  
Aran Song ◽  
Jungho Hwang ◽  
Daehae Kim ◽  
...  
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
High Speed ◽  
Equivalence Ratio ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Voigt Fitting ◽  
Diode Laser Absorption ◽  
Combustion Environment

It is important to monitor the temperature and H2O concentration in a large combustion environment in order to improve combustion (and thermal) efficiency and reduce harmful combustion emissions. However, it is difficult to simultaneously measure both internal temperature and gas concentration in a large combustion system because of the harsh environment with rapid flow. In regard, tunable diode laser absorption spectroscopy, which has the advantages of non-intrusive, high-speed response, and in situ measurement, is highly attractive for measuring the concentration of a specific gas species in the combustion environment. In this study, two partially overlapped H2O absorption signals were used in the tunable diode laser absorption spectroscopy (TDLAS) to measure the temperature and H2O concentration in a premixed CH4/air flame due to the wide selection of wavelengths with high temperature sensitivity and advantages where high frequency modulation can be applied. The wavelength regions of the two partially overlapped H2O absorptions were 1.3492 and 1.34927 μm. The measured signals separated the multi-peak Voigt fitting. As a result, the temperature measured by TDLAS based on multi-peak Voigt fitting in the premixed CH4/air flame was the highest at 1385.80 K for an equivalence ratio of 1.00. It also showed a similarity to those tendencies to the temperature measured by the corrected R-type T/C. In addition, the H2O concentrations measured by TDLAS based on the total integrated absorbance area for various equivalent ratios were consistent with those calculated by the chemical equilibrium simulation. Additionally, the H2O concentration measured at an equivalence ratio of 1.15 was the highest at 18.92%.

scholarly journals On the methodology of measuring high-speed flows using tunable diode laser absorption spectroscopy

2012 ◽  
Vol 61 (3) ◽  
pp. 034214
Author(s):  
Zhang Liang ◽  
Liu Jian-Guo ◽  
Kan Rui-Feng ◽  
Liu Wen-Qing ◽  
Zhang Yu-Jun ◽  
...  
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
High Speed ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Diode Laser Absorption ◽  
High Speed Flows
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