Project PRISM Optronics: Protection & Surveillance Dr Dirk Bezuidenhout CSIR.
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Transcript of Project PRISM Optronics: Protection & Surveillance Dr Dirk Bezuidenhout CSIR.
![Page 1: Project PRISM Optronics: Protection & Surveillance Dr Dirk Bezuidenhout CSIR.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649f265503460f94c3ccc3/html5/thumbnails/1.jpg)
Project PRISMProject PRISMOptronics: Protection & Optronics: Protection &
SurveillanceSurveillanceDr Dirk Bezuidenhout
CSIR
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Universities InvolvedUniversities Involved
StellenboschPhysics (Dr E Rohwer)Process Eng (Prof H Knoetze)
NMMUPhysics (Prof J Engelbrecht)
RhodesChemistry (Prof T Nyokong)
UKZNComputer Science (Prof J-R Tapamo)Physics (Dr V Couling)
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Universities InvolvedUniversities Involved
UJ Electr. & Electronic Eng. (Dr W Clarke)
UPMathematics (Dr R Anguelov)
TUTFrench South African Technical Institute in Electronics (Prof B van Wyk)
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Number of StudentsNumber of Students
Nine Departments
Eight Disciplines
Number of Students: 22
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PRISM-L: LasersPRISM-L: Lasers
Light SourcesCountermeasuresBeam Propagation
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High-power end-pumped High-power end-pumped Nd:YLFNd:YLF
A OM
P um p d iode 1 P um p d iode 2
OC
N d:YLF
R = - 30 m m
R = 150 m m
L1
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Reverse Saturable AbsorptionReverse Saturable Absorption
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Fibre Laser LaboratoryFibre Laser Laboratory
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PRISM-P: PyrophoricsPRISM-P: Pyrophorics
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PyrophoricsPyrophorics
Interface with Project COUPLE
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Semi- conductor MaterialsSemi- conductor Materials
0.30 0.32 0.34 0.52 0.54 0.56 0.58 0.60 0.62 0.64 0.66 0.680.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Wa
vele
ng
th (
nm
)
400
600
800
1000
2000
SiC
HgTe
CdTe
ZnOGaN
InP
AlSb
InAs InSb
GaSb
AlAsGaP
GaAs
SiEn
erg
y G
ap
(e
V)
Lattice constant (nm)
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Bandgap ModificationBandgap ModificationB
an
dg
ap
En
erg
y [
eV
]
0.0 0.2 0.4 0.6 0.8 1.0
0.15
0.25
0.35
0.45
Lat
tice
-mat
ched
to G
aSb
Wa
vele
ng
th [
nm
]
15000
100008000
6000
5000
4000
30003.537 μm
0.089
2 K
300 K
InSbInAs
Sb mole fraction x
4.218 μm
InAs1-XSbX
Bandgap spans strategic 3-7 μm range at low T
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Backside IlluminationBackside Illumination
Development of InAs0.91Sb0.09/GaSb backside-illuminated detector
λcut-off ~3.6 μm at 77 K
n:GaSb Substrate
n:InAs
p:InAsSb
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Optical Limiters: Electronic Optical Limiters: Electronic structurestructure 2 photon absorption
Singlet states S, triplets TCross sections σ Inter-System Crossing
Desirable properties:high triplet quantum yield σex >> σg
rapid inter-system crossinga long lifetime τT in the triplet stateoptical stabilityHigh damage thresholds for the material
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Metallo-phthalocyanines, MPcMetallo-phthalocyanines, MPc
Unsubstituted MPcSubstituted MPc
Peripheral substituent
Axial substituent
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SymmetrySymmetryZnPc
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0 1 2 3 4 5 6 7 8
r /Å
z /Å
C2v dome shape is energy minimum
C2v
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Highest Occupied Molecular Highest Occupied Molecular Orbital Orbital
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ResultsResults
Vibrational frequencies
0
1
2
3
4
5
6
40060080010001200140016001800
Frequency
IR i
nte
nsit
y
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Image ProcessingImage Processing
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Optical Surveillance PathOptical Surveillance Path
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Solar GlintSolar Glint
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Discreet Pulse TransformsDiscreet Pulse TransformsDevelop a method for the decomposition of images into 2D block pulsesAnalysis of sea images via discrete pulse decompositionCharacterization of the images of marine background in varying conditionsDeveloping algorithms for identifying anomalies in a sea imageAlgorithms for target detection using the discrete pulse decomposition of the image
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Image Processing and Optical Image Processing and Optical TrackingTracking
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Optical TrackingOptical Tracking
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Image ProcessingImage Processing
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Solving the Heat Scintillation Problem in Images(Rishaad Abdoola)
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Robust Real-Time Motion Detection
(Petrus Nyathela)
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Gated Camera ApplicationsGated Camera Applications
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Stress Induced BirefringenceStress Induced Birefringence
Birefringence Map for doublet
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QuestionsQuestions