Study on the effects of noises on the measurement results of nanoparticles' effective diameter and polydispersity using PCS

Guoguang Wu; Jun Xiang; Guanling Yang

doi:10.1117/12.840120

25 November 2009 Study on the effects of noises on the measurement results of nanoparticles' effective diameter and polydispersity using PCS

Guoguang Wu, Jun Xiang, Guanling Yang

Author Affiliations +

Proceedings Volume 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 750607 (2009) https://doi.org/10.1117/12.840120
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

Photon Correlation Spectroscopy (PCS) is one of the important methods for the measurement of nanoparticles' effective diameter and polydispersity. Noise has a significant impact on the measurement accuracy. To reduce the effects of noises on the measurement results of nanoparticles' effective diameter and polydispersity is an important means to improve the measurement accuracy. The theory of PCS is presented. The effects of noises on autocorrelation function (ACF) and inversion results of nanoparticles' effective diameter and polydispersity are introduced. The limitation of baseline selection method in weak noise situation is pointed out. Original photon scattering signal was acquired using high-speed acquisition method and the characteristic of photon signal were analyzed. The effects of noises with different strength levels on ACF and inversion results were simulated. Based on the baseline difference, more accurate results were achieved using the method of eliminating the distorted ACF caused by strong noises. The effectiveness of this method to improve the measurement accuracy was proved with example.

Citation Download Citation

Guoguang Wu, Jun Xiang, and Guanling Yang "Study on the effects of noises on the measurement results of nanoparticles' effective diameter and polydispersity using PCS", Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 750607 (25 November 2009); https://doi.org/10.1117/12.840120

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