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首页> 外文期刊>Optics Letters >Measurement of dye diffusion in agar gel by use of low-coherence interferometry
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Measurement of dye diffusion in agar gel by use of low-coherence interferometry

机译：通过低相干干涉法测量琼脂凝胶中的染料扩散

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We demonstrate low-coherence interferometry for diffusion measurements. We have measured the diffusion coefficient of a phthalocyanine dye in 1.5% agar gel with a two-wavelength interferometer; one wavelength was matched to the absorption peak of the dye at 675 run, while the other, 805 nm, was not affected by the dye. The diffusion coefficient of the dye was found by fitting a mathematical model for the interferometer signal to the measured low-coherence interferometry amplitude. A 95% confidence interval for the diffusion coefficient was found to be D = (2.5 +/- 0.2) x 10(-10) m(2)/s. The influence of speckle averaging and experiment time on the determination of the diffusion coefficient has been studied. The presented technique allows in situ characterization of diffusion in semitransparent media. (C) 2003 Optical Society of America. [References: 18]
机译：我们展示了用于扩散测量的低相干干涉测量法。我们用两波长干涉仪测量了酞菁染料在1.5％琼脂凝胶中的扩散系数。一个波长与染料在675nm处的吸收峰相匹配，而另一个波长805nm不受染料影响。通过将干涉仪信号的数学模型拟合到测得的低相干干涉仪振幅，可以找到染料的扩散系数。发现扩散系数的95％置信区间为D =（2.5 +/- 0.2）x 10（-10）m（2）/ s。研究了散斑平均和实验时间对扩散系数测定的影响。提出的技术允许在半透明介质中原位表征扩散。 （C）2003年美国眼镜学会。 [参考：18]

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