Influences of experimental parameters and inverse algorithms on nanometer particle size measured by self-designed system based on dynamic light scattering

Shaoyong Deng; Qi Zhang; Junying Xia

doi:10.1117/12.2068334

3 December 2014 Influences of experimental parameters and inverse algorithms on nanometer particle size measured by self-designed system based on dynamic light scattering

Shaoyong Deng, Qi Zhang, Junying Xia

Author Affiliations +

Proceedings Volume 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors; 929703 (2014) https://doi.org/10.1117/12.2068334
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

A totally self-designed experimental system based on dynamic light scattering is developed. The method of photon correlation spectroscopy is used to simulate the autocorrelation of measured scattering photons and scattering field. The dynamic autocorrelation software is self-compiled to replace the popular hardware digital correlator for much more correlation channels and much lower costs. Several inverse algorithms such as 1^st-order Cumulants, 2^nd-order Cumulants, NNLS, CONTIN and Double Exponents are used to compute the particle sizes and decay linewidths of both monodisperse systems and polydisperse systems. The programs based on these inverse algorithms are all self-compiled except the CONTIN. Influences of systematical parameters such as sample time, the last delay time, elapsed time, suspension's concentration and the baseline of scattering photons autocorrelation on the scattering photon counts, the autocorrelations of scattering photons and scattering field and the distribution of particle sizes are all investigated detailedly and are explained theoretically. The appropriate choices of systematical parameters are pointed out to make the experimental system more perfect. The limitations of the inverse algorithms are described and explained for the self-designed system. The methods of corrected 1^st-order Cumulants and corrected Double Exponents are developed to compute particle sizes correctly at wide time scale. The particle sizes measured by the optimized experimental system are very accurate.

Citation Download Citation

Shaoyong Deng, Qi Zhang, and Junying Xia "Influences of experimental parameters and inverse algorithms on nanometer particle size measured by self-designed system based on dynamic light scattering", Proc. SPIE 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 929703 (3 December 2014); https://doi.org/10.1117/12.2068334

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KEYWORDS

Particles

Scattering

Time correlated photon counting

Photon counting

Light scattering

Computing systems

Scatter measurement

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