shear stress sensor using cholesteric crystals
DESCRIPTION
Shear Stress Sensor Using Cholesteric Crystals. Group #3 Group Members Matthew Carmichael, FSU Tyler Elsey, FSU Luiz Paes, UNIFEI Graduate Assistant Matthew Worden Sponsors Dr. Dickinson , Eglin AFRL Dr. Oates, FAMU & FSU COE 2/20/2013 eng.fsu.edu/me/senior_design/2013/team3. - PowerPoint PPT PresentationTRANSCRIPT
PowerPoint Presentation
Shear Stress Sensor Using Cholesteric CrystalsGroup #3
Group MembersMatthew Carmichael, FSUTyler Elsey, FSULuiz Paes, UNIFEI
Graduate AssistantMatthew Worden
SponsorsDr. Dickinson , Eglin AFRLDr. Oates, FAMU & FSU COE
2/20/2013eng.fsu.edu/me/senior_design/2013/team31
OVERVIEWProject Scope and ObjectivesTheoryTechnical ApproachFinal Design Programming NeededSchedule
2Need Statement & Project ScopeNeed StatementNeed in the market for a shear stress sensor that can be used outside the labProject ScopeCreate Testing ApparatusDetermine if cholesteric crystals are able to measure shear stress
3Cholesteric Crystals4
Originally discovered in cholesterolHelical StructurePitch varies with the boundary conditions i.e. electricity or forcesLiquid Crystals made easily from 3 powdersPolymer form made through many time intensive processes
Technical Approach5
Assume no slip condition for liquid crystal testingBluLoop Fiber Optic LightSpectrometer: 200-1100 nm 2048 pixelsLinear Servo Motor:1 step = 1/64Load cell:10NFinal Design6
Programming7LabViewCorrelation between load and voltage with load cellLoad cell, spectrometer need to start at the same time record informationMATLABCreate method to review time resolved dataFilter spectrum from reference spectrumFind equation that relates load to wavelength
Labview8
Matlab9
Simulation10 FEM (Finite Element Method)Pressure - Sine Load -0.5 sin ((4/L)*x) Pa - top
0.5 sin ((4/L)*x) Pa - bottom
xyStress YY (Pa)Y Coordinate (m)
X Coordinate (m)Pressure Error Sigma YYX Coordinate (m)Error (Pa)
Simulation11 FEM (Finite Element Method)Pressure - Sine Load -0.5 sin ((4/c)*x) Pa - top
xyThin film - L=2000 (c)
Stress YY (Pa)Y Coordinate (m)X Coordinate (m)
Simulation12 FEM (Finite Element Method)Shear - Cosine Load -0.5 cos ((4/L)*x) Pa - top
0.5 cos ((4/L)*x) Pa - bottom
xyStress XY (Pa)Y Coordinate (m)X Coordinate (m)Pressure Error Sigma XYX Coordinate (m)Error (Pa)
Simulation13 FEM (Finite Element Method)Shear - Cosine Load -0.5 cos ((4/c)*x) Pa - top
xyThin film - L=2000 (c)
Stress XY (Pa)Y Coordinate (m)X Coordinate (m)
Schedule14
Summary15-Shear stress device measurement was fabricated
-Labview and MATLAB interface is ready for experiments
-Testing samples have been made
-Next steps
Testing and analysis
Vary testing conditions and test polymer form of Cholesteric Crystals
Questions/Comments16