高散射媒质中的光程可分割动态光散射研究

夏辉; 庞如意; 程建卫; 苗彩霞; 吴小云

高散射媒质中的光程可分割动态光散射研究

1.
中南大学物理科学与技术学院,湖南长沙 410083;
2.
太原卫星发射中心,山西五寨 036204

详细信息

通讯作者:
夏辉(1973-)，男，湖南慈利人，工学博士，教授，主要从事激光动态光散射技术、生物医学光学检测及纳米材料的光学检测等方面的研究。

中图分类号: TN201;O436
计量
- 文章访问数: 2858
- HTML全文浏览量: 107
- PDF下载量: 694
- 被引次数: 0
出版历程
- 刊出日期: 2012-05-15

Path-length-resolved dynamic light scattering in highly scattering media

1.
School of Physics Science and Technology,Central South University,Changsha 410083,China;
2.
Taiyuan Satellite Launch Center,Wuzhai 036204,China

摘要

摘要: 为研究散射光强度随光子在散射媒质中散射光程的变化，基于单散射理论与扩散波光谱理论，采用了低相干动态光散射装置对不同粒径大小的聚苯乙烯悬浮液进行研究。将测量得到的背散射光光场强度谱的线宽与相应的理论计算结果相比较发现，在短光程区域，考虑容器壁附近拖曳效应的影响后，对于不同粒径的颗粒，光程为约5倍粒子平均自由程的区域可看成为单散射区域；对于光程大于225 m的区域可看成为扩散光波区域。实验结果表明低相干动态光散射法可实现高散射媒质从单散射区域到低次散射再到扩散区域的全光程的可分割的光场强度谱测量。
- 低相干动态光散射 /
- 单散射 /
- 扩散波 /
- 平均自由程
Abstract: Based on single scattering theory and diffusing wave spectroscopy theory, low-coher-ence dynamic light scattering was used to investigate the path-length resolved light field intensity spectra of backscattering lights from different radius particles of colloidal suspensions. The linewidths of the measured light field intensity spectra were compared with the predict results calculated from the corresponding theories. The results show that in short path-length region, the measured linewidths well agree with that of the single scattering after considering the influences of wall-drag effect close to the interface. For different radius particles, the region with the path length about 5 times of the mean-free path length can be regarded as a single scattering region, while the region with the propagated path length larger than 225 m can be regarded as a diffusing region. It is demonstrated that the low-coherence dynamic light scattering can realize resolved path-length light field intensity spectra measurement from single scattering to diffusive scattering regions for dense suspensions.
- low-coherence dynamic light scattering /
- single scattering /
- diffusing wave spectroscopy /
- mean-free path length

HTML全文

参考文献(1)

［1］PECORA R. Dynamic light scattering: applications of photon correlation spectroscopy［M］. Berlin: Spring-er, 1985.

［2］邓勇, 骆清铭, 鲁强. 双层散射介质的单次后向散射光谱分析［J］. 光学学报，2006，26(4): 595-599.

DENG Yong, LUO Qing-ming, LU Qiang. Analyses of single backscattering spectra for a two-layer scattering medium［J］. Acta Optica Sinica, 2006, 26(4): 595-599. (in Chinese with an English abstract)

［3］尚玉峰, 蒋达娅, 肖井华, 等. 动态光散射实验［J］. 物理实验, 2004, 24(10): 9-11.

SHANG Yu-feng, JIANG Da-ya, XIAO Jing-hua, et al. Dynamic light scattering experiment ［J］. Physics Experimentation, 2004, 24(10): 9-11. (in Chinese with an English abstract)

［4］吴丽萍, 冷小京, 孙雁, 等. 动态光散射和透射电镜法研究pH和NaCl对丝胶蛋白微观结构的影响［J］. 光谱学与光谱分析, 2010, 30(5): 1391-1395.

WU Li-ping, LENG Xiao-jing, SUN Yan, et al. Analysis of the effects of pH and salt on the conformation of the sericin particles by DLS and TEM measurements［J］. Spectroscopy and Spectral Analysis, 2010, 30(5): 1391-1395. (in Chinese with an English abstract)

［5］POPESCU G, DOGARIU A. Optical pathlength spectroscopy of wave propagation in random media［J］. Optics Letters, 1999, 24(7): 442-444.

［6］KOSTADINKA K B, ANDY M S, DAVOD A B. Path-length-resolved dynamic light scattering in highly scattering random media: The transition to diffusing wave spectroscopy［J］. Phys. Rev. E, 1998, 58(6): 7664-7667.

［7］ADAM W, CHANGHUEI Y, RAMACHANDRA R D,et al. Path-length-resolved dynamic light scattering: modeling the transition from single to diffusive scattering［J］. Applied Optics, 2001, 40(24): 4222-4227.

［8］HUI X, KATSUHIRO I, TOSHIAKI I, et al. Hydrodynamic radius sizing of nanoparticles in dense polydisperse media by low-coherence dynamic light scattering［J］. J. Appl. Phys., 2005, 44: 6261-6264.

［9］夏辉, 肖元元, 林旭, 等. 应用低相干动态光散射法测量悬浮液中的颗粒粒径分布［J］. 光散射学报, 2010, 37(12): 3019-3024 .

XIA Hui, XIAO Yuan-yuan, LIN Xu, et al. Particle size distribution of colloidal suspensions using low—coherence dynamic light scattering［J］. The Journal of Light Scattering, 2010, 22(3): 211-215. (in Chinese with an English abstract)

［10］KATSUHIRO I, RIKIYA Y, TOSHIAKI I. Single-scattering spectroscopy for extremely dense colloidal suspensions by use of a low-coherence interometer［J］. Optics Letters, 2005, 30(5): 555-557.

［11］VARGHESE B, RAJIAN V, VAN-LEEUWEN T G, et al. Quantification of optical doppler broadening and optical path lengths of multiply scattered light by phase modulated low coherence interferometry［J］. Optics Express, 2007, 15(15): 9157-9165.

［12］夏辉, 林旭, 肖元元, 等. 光子在高散射媒质中传输特性的蒙特卡罗模拟［J］. 中国激光, 2010, 37(12): 3019-3024.

XIA Hui, LIN Xu, XIAO Yuan-yuan, et al. Monte-Carlo simulation of photon-s transport properties in highly scattering media［J］. Chinese Journal of Lasers, 2010, 37(12): 3019-3024. (in Chinese with an English abstract)

［13］王凌, 徐之海, 冯华军. 多分散高浓度介质偏振光后向扩散散射的Monte Carlo仿真［J］. 物理学报, 2005, 54(6): 2694-2698.

WANG Ling, XU Zhi-hai, FENG Hua-jun. Monte carlo simulation for diffuse backscattering of polarized light from poly-disperse highly dense media［J］. Chin. Phys. Soc., 2005, 54(6): 2694-2698. (in Chinese with an English abstract)

［14］夏辉, 陈智全, 李富石, 等. 拖曳效应对低相干动态光散射散射测量粒径的影响［J］. 光学学报, 2010, 30(8): 2257-2261.

XIA Hui, CHEN Zhi-quan, LI Fu-shi, et al. Influence of wall-drag effect on particle sizing in low-coherence dynamic light scattering［J］. Acta Optica Sinica, 2010, 30(8): 2257-2261. (in Chinese with an English abstract)

［15］FEITOSA M I M, MESQUITA O N. Wall-drag effect on diffusion of colloidal particles near surfaces: a photon correlation study［J］. Phys. Rev. A, 1991, 44 (10): 6677-6685.

［16］HOSODA M, SAKIA K, TAKAGI K. Measurement of anisotropic brownian motion near an interface by evanescent light scattering spectroscopy［J］. Phys. Rev. E, 1998, 58(5): 12050-12056.

施引文献

资源附件(0)

访问统计