| Summary: | 碩士 === 國立海洋大學 === 造船工程學系 === 84 === In this paper, a newly developed color image anemometer (CIA)
method is proposed and applied to measure a partitioned channel
flow . Multiple exposure particle images , illuminated by
alternating blue and green laser light , are recorded by a
single frame with a 3-CCD camera . The image is then separated
into , blue and green respectively , sequential images using
appropriate band process . The velocity field and flow direction
can then be determined from these two sequential image . The
frequency of the generated plused laser sheet is determined from
the products of rotating frequency and the number of working
mirror facets . A fiber optic sensor is placed at the lee side
of light sheet . When a laser beam is detected by the sensor , a
pulse is sent to the PloyChromatic Acousto-Optical Module
(PCAOM) driver to alter the laser output wavelengths , normally
488 nm blue light and 514nm green light . Alternating color ,
blue and green , laser light sheet can thus be generated . The
multiple exposure , alternating color particle image is taken by
a Sony 3-CCD camera triggered from an Oculus TCX frame grabber
.
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