CCD based approach to high-precision size and refractive index determination of levitated microdroplets using Fraunhofer diffraction

被引:44
作者
Barnes, MD
Lermer, N
Whitten, WB
Ramsey, JM
机构
[1] Chem. and Analyt. Sciences Division, Oak Ridge National Laboratory, Oak Ridge
关键词
D O I
10.1063/1.1148134
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
We describe a fast and convenient method of high precision size and refractive index determination of electrodynamically levitated microdroplets using Fraunhofer diffraction. The diffraction data were obtained with a 16-bit, unintensified charge coupled device (CCD) camera, and converted into angle-resolved elastic scattering intensity patterns by means of a carefully determined set of transformation parameters. The angular scattering patterns were analyzed without any a priori estimate of the droplet size and only a nominal estimate (approximate to 2%) of the refractive index. Experimental angular scattering patterns were fit to calculated patterns from Mie theory using a graded step-size and scaling algorithm and optimized with respect to both droplet diameter and refractive index (real part only) with a precision of less than or equal to 3 parts in 10(4) and 1 part in 10(3), respectively. Potential application to quantitative fluorescence and Raman spectroscopy, as well as mixture analysis in microdroplets is discussed. (C) 1997 American Institute of Physics.
引用
收藏
页码:2287 / 2291
页数:5
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