| Citation: | SHI Jianwei, WU Wei, YANG Huinan, et al. Simultaneous measurement of multi-parameter of liquid film for urea-water-solution by laser spectroscopy[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(2): 360-365. doi: 10.13700/j.bh.1001-5965.2016.0101(in Chinese)
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Quantitative analysis of liquid film temperature, thickness and mass fraction is extremely crucial to the relevant industrial processes, and these parameters are mutually coupled in the study of the mechanism for heat transfer. Temperature, thickness and mass fraction of liquid film, however, can only be determined individually by conventional measurement techniques. In this paper, a novel measurement method based on Beer-Lambert law to measure the film temperature, thickness and mass fraction of urea-water-solution simultaneously was developed by combining three lasers with different wavelengths:1 420, 1 488 and 1 531 nm. In addition, measurement accuracy of this method was validated by a sample cell with controlled temperature and 1 mm optical path length. The experimental results reveal that average relative errors of thickness, temperature and mass fraction of urea-water-solutions measured by the developed method are 0.51%, 2.59% and 6.32%, respectively.
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