Abstract
The electronic speckle pattern interferometer in the double-pulse
addition mode can be used to measure physical parameters in unstable
environmental conditions. Owing to additive optical noise, however, the fringe
patterns obtained have poor contrast. Some methods that use subtraction of
addition double-pulsed fringe patterns improve fringe visibility but impose a
limitation in measurement time ranges. To increase this range, to be limited
by only the pulse separation, the contrast enhancement of double-pulsed
addition-fringe patterns with a spatial filter based on
local-standard-deviation measurements is investigated. Computer simulations and
experimental results are presented.
© 1997 Optical Society of America
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