Noise in laser speckle correlation and imaging techniques

Details Noise in laser speckle correlation and imaging techniques Noise in laser speckle correlation and imaging techniques

2010-05-17

arxiv.org/abs/1005.2875v1

Optics Express, Vol. 18, Issue 14, pp. 14519-14534 (2010)

Physics

Optics

submitted 14 May 2010

Scientific paper

10.1364/OE.18.014519

We study the noise of the intensity variance and of the intensity correlation and structure functions measured in light scattering from a random medium in the case when these quantities are obtained by averaging over a finite number N of pixels of a digital camera. We show that the noise scales as 1/N in all cases and that it is sensitive to correlations of signals corresponding to adjacent pixels as well as to the effective time averaging (due to the finite sampling time) and spatial averaging (due to the finite pixel size). Our results provide a guide to estimation of noise level in such applications as the multi-speckle dynamic light scattering, time-resolved correlation spectroscopy, speckle visibility spectroscopy, laser speckle imaging etc.

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