Abstract
A motionless despeckle element based on Mie scattering and Brownian
motion of suspended particles is proposed, which is achieved by filling a
light pipe with diluted milk in laser projection systems. The Brownian motion
of the milk fat particles leads to the superposition of the intensity of the
instantaneous scattered light within the integration time of the human eye,
which causes a reduction in laser speckle contrast because of temporal averaging
intensity. Experimental results show that the speckle contrast mainly depends
on the concentration of the suspended fat particles, and can be reduced down
to 3.94% at the fat particle concentration of approximately
$7.0 \times 10^{-4}$
$\mu$
m
$^{-3}$
.
© 2013 IEEE
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