A CCD based approach to size and complex refractive index determination of absorbing droplet using rainbow scattering

Qi Pan

doi:10.1117/12.2038181

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19 December 2013 A CCD based approach to size and complex refractive index determination of absorbing droplet using rainbow scattering

Qi Pan

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Proceedings Volume 9046, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 90461E (2013) https://doi.org/10.1117/12.2038181
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

A novel method for measuring droplet size and complex refractive index simultaneously using a CCD camera by rainbow detecting is proposed. A new mathematic model for rainbow pattern of absorbing droplet is built. Based on this model, a series of new formulas to measure droplet imaginary part of refractive index are derived. Then a new method for simultaneously measure droplet size and the complex refractive index is presented, which is verified by simulation experiments under different conditions. The experiment is performed to measure water with different dye concentrations. To avoid the effect of non-sphericity on refractive index detecting, a long and stable water cylinder instead of droplet is measured. Both the diameter and the complex refractive index of the liquid cylinder are detected by measuring the scattering rainbow light which is received by a linear CCD camera placed in the focus of the lens system. The result shows a satisfactory agreement with the theoretical analysis.

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Qi Pan "A CCD based approach to size and complex refractive index determination of absorbing droplet using rainbow scattering", Proc. SPIE 9046, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 90461E (19 December 2013); https://doi.org/10.1117/12.2038181

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