Characterizing the micro structure and kinetics of fast changing samples by simultaneous polarization measurements

Ran Liao; Honghui He; Nan Zeng; Hui Ma

doi:10.1117/12.2182612

5 March 2015 Characterizing the micro structure and kinetics of fast changing samples by simultaneous polarization measurements

Ran Liao, Honghui He, Nan Zeng, Hui Ma

Author Affiliations +

Proceedings Volume 9322, Dynamics and Fluctuations in Biomedical Photonics XII; 93220C (2015) https://doi.org/10.1117/12.2182612
Event: SPIE BiOS, 2015, San Francisco, California, United States

Abstract

Taking accurate measurements of the state of polarization (SOP) is the key for the success of polarization sensitive techniques which can provide rich information on the microstructure of complex scattering media, such as biological tissues. For static or slow varying samples, SOP measurements can be achieved by time-sequential recoding of different polarization components controlled by rotating polarizers and wave plates or temporal modulation devices such as photoelastic modulators or liquid crystal variable retarders. When the sample is moving or changing its status quickly, polarization components recoded at different time may correspond to different SOPs, which can lead to significant errors in the final results. Simultaneous polarization measurements are necessary for probing such dynamic samples. In this paper, using the simultaneously recorded polarization components, we are able to mimic time sequential polarization schemes and evaluate the errors. The results show that the kinetics of the sample will affect the systematic error and an increase in the statistical errors of the measured degree of polarization (DOP). We change the kinetics of samples with different stirring speed, which is indicated by the characteristic time of the auto-correlation function. It is also demonstrated that the simultaneously recorded polarization components reveals additional information on the orientation of fibrous scatterers as well as their translation and rotation kinetics.

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Ran Liao, Honghui He, Nan Zeng, and Hui Ma "Characterizing the micro structure and kinetics of fast changing samples by simultaneous polarization measurements", Proc. SPIE 9322, Dynamics and Fluctuations in Biomedical Photonics XII, 93220C (5 March 2015); https://doi.org/10.1117/12.2182612

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