简介:Fluorescent tracer particles have found a number of uses in
PIV. A light sheet produces flare when it impinges upon an
object within the field of view, preventing particle images
from being obtained and hence preventi简介:Fluorescent tracer particles have found a number of uses in
PIV. A light sheet produces flare when it impinges upon an
object within the field of view, preventing particle images
from being obtained and hence preventing velocity
measurements in that locality. An example is shown in
figure 1 where 532nm light is used for excitation and imaging.
Whilst in some situations flare may be minimized by careful
experiment setup, in some applications flare is difficult to
avoid and prevents information from being obtained, e.g. in
boundary layer measurements. A further application has
been explored where fluorescent tracers are used to optically
label one phase or constituent of a flow and thereby enable
simultaneous multi-constituent PIV [1-3].
The general application of fluorescent tracers to gas phase
flow seeding requires sufficient fluorescence emission from
micron sized tracers when imaged over 10’s of mm field of
view. For multi-constituent and multi-phase flows sufficient
chromatic separation is also required between the
illumination and the fluorescence and between the
fluorescence and any wavelengths used for Mie scattering.详细>