The Spectral Analysis of Dynamic Laser Speckle Patterns Generated by Brownian Particle Suspensions : A Stroboscopic Effect Based Filtering Technique
Joint Authors
Ranger, James
Wang, Dake
Moyer, Adam
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-08-05
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
The power spectrum of the time-varying intensity in the dynamic laser speckle patterns is determined by passing the shifted power spectrum through a low-pass filter which is implemented via the signal integration.
The light intensity is modulated sinusoidally to induce the stroboscopic effect which shifts the resonant frequency component of the spectrum to 0 Hz.
The homodyne dynamic laser speckles generated by the quasi-inelastic scattering of the Brownian motions in colloidal suspensions are investigated.
Within the frequency range from 10 Hz to 10 kHz used in this work, the bandwidth of the Lorenztian power spectrums is shown to be inversely proportional to the particle size, which is in agreement with the prediction of the dynamic light scattering theory of diffusing particle.
The spatial variation observed in the full-field power spectrum maps is caused by the nonuniform distribution of average speckle intensity and varies with the modulation frequency.
However, the bandwidths measured at different locations are found to be intensity independent.
American Psychological Association (APA)
Wang, Dake& Ranger, James& Moyer, Adam. 2014. The Spectral Analysis of Dynamic Laser Speckle Patterns Generated by Brownian Particle Suspensions : A Stroboscopic Effect Based Filtering Technique. Advances in Optics،Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-500125
Modern Language Association (MLA)
Wang, Dake…[et al.]. The Spectral Analysis of Dynamic Laser Speckle Patterns Generated by Brownian Particle Suspensions : A Stroboscopic Effect Based Filtering Technique. Advances in Optics No. 2014 (2014), pp.1-9.
https://search.emarefa.net/detail/BIM-500125
American Medical Association (AMA)
Wang, Dake& Ranger, James& Moyer, Adam. The Spectral Analysis of Dynamic Laser Speckle Patterns Generated by Brownian Particle Suspensions : A Stroboscopic Effect Based Filtering Technique. Advances in Optics. 2014. Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-500125
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-500125