Experimental validation of non-sphericity effect on monochromatic rainbow measurement

Qi Pan; Zijia Zhang

doi:10.1117/12.2015210

31 January 2013 Experimental validation of non-sphericity effect on monochromatic rainbow measurement

Qi Pan, Zijia Zhang

Proceedings Volume 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation; 875940 (2013) https://doi.org/10.1117/12.2015210
Event: International Symposium on Precision Engineering Measurement and Instrumentation 2012, 2012, Chengdu, China

Abstract

Monochromatic rainbow measurement, as a laser based interference detecting technique, is always used to measure particle refractive index. However, the accuracy of this method is effected by particle non-sphericity. In this paper, the non-sphericity effect is analyzed from both simulation and experiment. The non-sphericity effect for both prolate and oblate spheroid is studied. The simulation result shows that the axial ratio greatly effects the rainbow angle position, and eventually effect the refractive index evaluation. An experiment is also taken. The refractive indexes of ethanol solutions with different concentration are measured by monochromatic rainbow method. A comparison is taken between the results measured from the rainbows formed by a liquid cylinder and rainbows of free falling droplets.

Citation Download Citation

Qi Pan and Zijia Zhang "Experimental validation of non-sphericity effect on monochromatic rainbow measurement", Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 875940 (31 January 2013); https://doi.org/10.1117/12.2015210

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