Abstract
The real time acquisition of the optical radiation information of multi
points in free space is a difficult problem for the optical fluid fields
testing. Traditional data acquisition systems are based on multichannel
charge coupled device (CCD), with which the optical radiation information
from multi directions can be obtained. However these systems are hard to fit
the requirement of parallel beam imaging, and hence bring great errors of
inverse computations. A multichannel real time data acquisition system based
on a digital signal processor (DSP) and a number of optical fiber bundles
(OFBs) is proposed in this paper for fluid field reconstructions. Each OFB
unit can acquire the optical radiation information that transmits into its
entrance aperture via a sensor unit consisting of an optical fiber coupler
and a phototransistor. The DSP acts as a main controller that switches on
the exposure of all phototransistors synchronously based on the mechanism of
electronic shutter. The synchronous sensed signals are locked by a peak hold
circuit and then outputted to analog-to-digital converters (ADCs), and
therefore the real time acquisition of the optical radiation information of
multi points in free space can be realized, which offers the original
parallel beam imaging data for the fluid field reconstructions.
© 2011 IEEE
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