fluorescent paint
DESCRIPTION
paint requirementTRANSCRIPT
-
LAVISION GMBHANNA-VANDENHOECK-RING 19 / D-37081 GOETTINGEN / GERMANY
E-MAIL: [email protected]/ WWW.LAVISION.DETEL. +49-(0)5 51 90 04- 0 / FAX +49-(0)5 51 90 04- 100
LAVISION INC.301 W. MICHIGAN AVE. / SUITE 403 / YPSILANTI, MI 48179 / USA
E-MAIL: [email protected]/ WWW.LAVISIONINC.COMTEL. (734) 485 - 0913 / FAX (240) 465 - 4306
FluorescentPaint
To reduce laser lightreflections in PIV
recordings
When it is important to measure a flow field with PIV close to walls -e.g. some blades of a turbine - it is nearly impossible to avoid brightreflections of the light sheet in the area of interest. The intensities ofthese reflections are much higher than the typical particle signal. Inorder to avoid saturation of the CCD the intensity of the reflectionsdetermines the maximum laser energy that can be used for therecording. To obtain sufficient particle signal it is essential tominimize the intensity of these reflections.
Often it is sufficient to color parts of the experiment in the field ofview with ordinary dull black paint. Since this is not always satisfyingLaVision recommends to use Fluorescent Paint. This paint turnssome amount of the green laser light into red fluorescent light. Theefficiency is typically about 30%. During the PIV recording the greenbandpass filter - delivered with the LaVision FlowMaster system blocks the red fluorescent light and so less light from the reflection isimaged to the CCD.
Applications : PIV measurements
in IC engines in turbines close to boundary layers
Plate with ordinary blackanodization and FluorescentPaint on white paint.
Laser light sheet imaged withCCD camera and greenbandpass filter.
Intensity in a horizontal cutthrough the light sheet and adefinite reduction by theFluorescent paint.
Formula :
solve 3g Rhodamine6G C28H31N2O3Cl (alternatively RhodamineB) in10 ml ethanol
add 500ml transparent acrylic paint (water soluble!) to achieveoptimum fluorescence