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ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Research, Design and Developmentof Optical Systems withExtended Depth Of Field
Luisa De Marcotutor: Prof. Paolo Bassi
cotutors: Ing. Federico Canini, Ing. Bassam Hallal
18 Ottobre 2010
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Outline
1 IntroductionResearch aimResearch Phases
2 Measurement toolBackgroundSaFaRiLABResults
3 Illumination SystemDesignPrototypingMeasurement
4 Optical SystemResearchDesign
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Outline
1 IntroductionResearch aimResearch Phases
2 Measurement toolBackgroundSaFaRiLABResults
3 Illumination SystemDesignPrototypingMeasurement
4 Optical SystemResearchDesign
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Research aim
Problem: extending Depth Of Field (DOF)
Possible applications:
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Research aim
Designing Barcode reader...
Design Phases:
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Research Phases
Research planning:
First year measurement tool, basis for designing opticalimaging systems
Second year design of optical systems for extending depthof field (DOF):
illumination system which helps theextension of DOFoptical imaging system with high DOFusing an existing technology
Third year design and realization of an optical imagingsystem with high depth of field using a newapproach/technology
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Outline
1 IntroductionResearch aimResearch Phases
2 Measurement toolBackgroundSaFaRiLABResults
3 Illumination SystemDesignPrototypingMeasurement
4 Optical SystemResearchDesign
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Background
Spatial Domain:Point Spread Function (PSF)
Spatial Frequency Domain:Spatial Frequency Response (SFR)
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Background
Edge Source: Slanted edge to avoid sampling effect(dependency on pixel array alignment wrt the edge)
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
SaFaRiLAB
Software: SaFaRi
SFR calculation from a slanted edge imageISO 12233 standard gives guidelines for SFRevaluation
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
SaFaRiLAB
Measurement set up: LAB
Integrating spheres and slanted edge target
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Results
SaFaRi vs Imatest and ImageJ:
Tests on experimental images
SaFaRiLAB: comparable with other available softwares
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Results
Measurement vs Design:measured SFR refers to the whole systemoptical SFR obtained deconvolving different features
Good agreement between the measured SFR and theSFR obtained combining lens and sensor
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Outline
1 IntroductionResearch aimResearch Phases
2 Measurement toolBackgroundSaFaRiLABResults
3 Illumination SystemDesignPrototypingMeasurement
4 Optical SystemResearchDesign
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Design
Free-Form Lens:one surface plane: z = costthe other one free (polynomial):
z = f (x , y) = c1x2 + c2y2 + c3x4 + c4x2y2 + c5y4 · · ·+ c6x6 + c7x4y2 + c8x2y4 + c9y6
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Design
Desired illumination profile on the target:limited into a desired area and with more light along thearea edges (compensation for sensor light losses)implementation (in MATLAB) of a software foroptimization of the free-form lens coefficientsresults checked using TRACEPRO
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Prototyping
Lens Free-Form prototype:Size: 4.5mm×4.5mm×1.9mmMaterial: Acrylic (n = 1.49 at 632nm)
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Measurement
Surface measurement:Digital Electronic Automation (DEA), a coordinatemeasuring machine
Result:good agreement between measured and designedsurface
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Measurement
Irradiance profile measurement:set up: camera (barcode-reader), diffuser glass, LEDwith free form lensirradiance profile image
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Measurement
Result:
good agreement between irradiance profile of free-formlens DESIGNED and MEASURED
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Outline
1 IntroductionResearch aimResearch Phases
2 Measurement toolBackgroundSaFaRiLABResults
3 Illumination SystemDesignPrototypingMeasurement
4 Optical SystemResearchDesign
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Research
There are many possible solutions to extend depth of fieldwe choose Cubic Phase Mask (CPM)
CPM = f (x , y) = α(x3 + y3)
...because:simple to design, prototype and testtheoretical basis (many studies about it)stable and cheap
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Research
good performance (the same SFR at differentdistances)
SFR
near
field
SFR
in focus
SFR
in focus
SFR
near
field
SFR
far
field
SFR
far
field
WITH PHASE MASK
WITHOUT PHASE MASK
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Design
Optical imaging system design (in ZEMAX):objective already designedoptimization of α in cubic phase mask
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Design
Performance design evaluation:minimum resolving power [Mils]
0 0.25 0.5 0.75 10
0.25
0.5
0.75
1
Normalized spatial frequency
SFR
threshold (th)
frequency limit (fth)
R =minimum resolutionM = magnification
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Design
Performance without CPM vs with CPM:
Results:objective better for intermediate resolutionsobjective with CPM better for high and low resolutionsbetter optimization obtained re-designing the objective
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions
Conclusions
Conclusions:Efficient measurement tool (ready to use)Good illumination system (ready to use)Good performance of cubic phase mask (ready toprototype)
Future developments:To prototype the optimized Cubic Phase MaskTo measure it with SaFaRiLABRealization of a NEW (not patented) optical imagingsystem with high Depth Of Field
ResearchDesign and
Developmentof Optical
Systems withEDOF
Luisa DeMarco
IntroductionResearch aim
Research Phases
MeasurementtoolBackground
SaFaRiLAB
Results
IlluminationSystemDesign
Prototyping
Measurement
OpticalSystemResearch
Design
Conclusions