| Summary: | 碩士 === 逢甲大學 === 土木及水利工程研究所 === 86 === In order to avoid interference of flow field by
traditionalmeasuring sensor, a non-interference method, called
Planar Laser-Induced Fluorescence (PLIF), is adopted and
investigated in measuringconcentration profiles of gravity
currents. The underlined theory ofmethod is based on the
relationship between concentration of PLIFfluorescence solution
and its reflection intensity by light sheet of laserbeam. The
major factors affecting accuracy of PLIF method are (a)
sunlight, (b) time decay of fluorescence solution, (c) distance
decay of laserbeam, (d) stability of laser power, and (e) decay
of laser-light sheet bywater depth. Techniques of reducing these
factors are discussed. Forconcentration below 60.87 , a linear
relationship exists for fluorescence intensity and
concentration. Constant concentration layers occur for certain
flow conditions. From dimensionless plot of allconcentration
profiles, not all profiles have the similar form. Othermethods
are still needed for comparison and calibration purposes.
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