Mr. Jin-hu Duan Profile

Jin-hu Duan

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Proceedings Article | 26 January 2016 Paper

Direct absorption spectroscopy sensor for temperature and H2O concentration of flat flame burner

Jin-hu Duan, Xing Jin, Guang-yu Wang, Dong-sheng Qu

Proceedings Volume 9796, 979614 (2016) https://doi.org/10.1117/12.2228075

KEYWORDS: Absorption spectroscopy, Sensors, Tunable diode lasers, Time division multiplexing, Temperature metrology, Combustion, Absorption, Absorbance, Molecules, Fabry–Perot interferometers, Error analysis

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A tunable diode laser absorption sensor, based on direct absorption spectroscopy and time division multiplexing scheme, was developed to measure H₂O concentration and temperature of flat flame burner. At the height of 15mm from the furnace surface, temperature and concentration were measured at different equivalence ratios. Then the distance between the laser and the furnace surface was changed while the equivalence ratio was fixed at 1 and experiments were performed to measure temperature and H₂O concentration at every height. At last flame temperatures and H₂O concentrations were obtained by simulation and computational analysis and these combustion parameters were compared with the reference. The results showed that the experimental results were in accordance with the reference values. Temperature errors were less than 4% and H2O component concentration errors were less than 5%and both of them reached their maximum when the equivalent ratio was set at 1. The temperature and H₂O concentration increased with the height from furnace surface to laser when it varied from 3mm to 9mm and it decreased when it varied from 9mm to 30mm and they reached their maximum at the height of 9mm. Keywords: tunable diode laser, direct absorption spectroscopy

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