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27 March 2022 High dynamic dew point measurement with two-wavelength TDLAS
Bin Wang, Xin Zeng, Wenqing Zhang, Wen Gai, Ping Wang
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Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169D9 (2022) https://doi.org/10.1117/12.2627433
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China
Abstract
To solve the problem that the dew point water vapor content in a low-temperature wind tunnel spans six orders of magnitude and the dynamic range of dew point measurement is high, the dew point measurement technology of dualwavelength laser absorption spectrum is studied in this paper. Using the hitran2012 database, the dew point absorption spectrum is simulated. 1854nm laser is selected for high dew point measurement and 2626nm laser for low dew point measurement. Through the combination of two bands, the high dynamic dew point measurement in the range of - 100℃~30℃ is realized, which meets the requirements of the dew point measurement range of low-temperature wind tunnel, and the measurement error is less than 2℃.
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Bin Wang, Xin Zeng, Wenqing Zhang, Wen Gai, and Ping Wang "High dynamic dew point measurement with two-wavelength TDLAS", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169D9 (27 March 2022); https://doi.org/10.1117/12.2627433
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KEYWORDS
Absorption
Wind measurement
Sensors
Humidity
Metrology
Semiconductor lasers
In situ metrology
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