centaurµs centaurus technical review. centaurµs centaurus standard features transmission...
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Centaurµs
Centaurus
Technical Review
Centaurµs
Centaurus Standard Features
• Transmission• Reflection• A single aperture before the sample
– Targeting• Manual focus• Manual Full Field (Glass) Aperture• Simultaneous View and IR• Integrated Video• Integrated Contact alert
Centaurµs
Centaurus Options
• ATR– ZnSe, Si, Ge crystals
• Motorized Stage• Manual Stage• Auto Focus• Binocular Viewer• MCT Detectors
– Narrow, Mid, or Wide band
Centaurµs
Centaurus Specifications• 10x optics
– N.A. = 0.71• Video and Field of View matched
– 600 x 450um• IR Spot size 200um• Working distance
– 9mm• Angle of Incidence
– 44°- 19°• Magnification 100x
Centaurµs
Signal to Noise
• 2 minute collect at a resolution of 4 cm-1, triangular apodization, 1.0 mm square aperture with MCT A mid-band detector on Nexus
• Transmission mean average .028peak to peak– Signal to noise ratio 3000 to 1
• Reflection mean average .065 peak to peak– Signal to noise ratio 1500 to 1
Centaurµs
Field of View
Field of Viewis 600 x 450micrometers
Matches thebinocularviewer
Centaurµs
• 12 um Kevlar™ fiber
Centaurµs
Superior performance of Targeting™ in a Single Aperturing
SystemKevlar 12 um fiber on Hammer12 micron kevlar - single aperture IRus after the sample
15
20
25
30
35
40
45
50
55
%T
1000 1500 2000 2500 3000 3500 Wavenumbers (cm-1)
12 µm fiber
12 x 40 µm aperture
Targeting Vs. single aperture after the sample
Centaurµs
Dark Mirror CoatingEliminates HeNe
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
Sin
gle
Bea
m
1000 2000 3000 4000 Wavenumbers (cm-1)
Blocks HeNe
Reflects IR Radiation 98% of Gold
Centaurµs
Transmission
• Multi layered laminate• 4 layers• 30 to 60 um layers Polypropylene layer 3
50
100
%T
Layer 4 Polyester
50%T
Layer 1 Polyester
20
40
60
80
%T
Polypropylene layer 2
50
100
%T
1000 2000 3000 Wavenumbers (cm-1)
Centaurµs
Transmission Nylon fiber
5 10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
%R
efle
ctan
ce
1000 2000 3000 Wavenumbers (cm-1)
Nylon Fiber
Centaurµs
Palm Oil Palm Oil
10
20
30
40
50
60
70
80
90
100
110
%Tr
ansm
ittan
ce
1000 2000 3000 Wavenumbers (cm-1)
Centaurµs
Reflection
• External Reflection– Reflection absorption– Specular Reflection
• Internal reflection (ATR) – Znse, Ge, and Si
Centaurµs
Specular ReflectionApoxy Resin
Alkyd resin specular
2.0
2.5
3.0
3.5
4.0
4.5
5.0
%T
Converted spectrum
0.0
0.2
0.4
0.6
0.8
1.0
Abs
orba
nce
1000 1500 2000 2500 3000 3500 Wavenumbers (cm-1)
Centaurµs
Reflection Absorbtion
• High signal to noise
• 30 second acquisition time
beeswax chapstick
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
%R
efle
ctan
ce
1000 2000 3000 Wavenumbers (cm-1)
Centaurµs
ATR
• ZnSe, Ge, Si• Energy throughput comparable to
InspectIR • Frequency test using Toluene• No spectral artifacts
Centaurµs
ATR Frequency/Artifacts TestTransmission SI crystal Ge crystal ZnSe crystal
3028 cm-1 3028 cm-1 3028 cm-1 3028 cm-1
1495 cm-1 1495 cm-1 1495 cm-1 1495 cm-1
728 cm-1 728 cm-1 728 cm-1 728 cm-1
Hammer ATR GE crystal Toluene 200 um aperture
0.0
0.2
0.4
0.6
0.8
Abs
Hammer toluene SI ATR 200 um aperture
0.0
0.2
0.4
0.6
0.8
Abs
Hammer ATR ZnSe Toluene 200 um aperture
0.0
0.2
0.4
0.6
0.8
Abs
800 1000 1200 1400 1600 1800 Wavenumbers (cm-1)
Centaurµs
ZnSe ATR Ink on Business Card
40
45
50
55
60
65
70
75
80
85
90
95
100
%T
rans
mitt
ance
1000 1500 2000 2500 3000 3500 Wavenumbers (cm-1)
High signal to noise
Equivalent Performance to InspectIR
Use with or without aperture
Centaurµs
Si ATR CrystalWed Jan 03 10:10:45 2001Red layer
86
88
90
92
94
96
98
%R
efle
ctan
ce
Wed Jan 03 10:12:31 2001Blue layer
70
75
80
85
90
95
%R
efle
ctan
ce
1000 2000 3000 Wavenumbers (cm-1)
Centaurµs
GE ATR Crystal• Shallow depth of penetration• Good for carbon or filled samples
Antihistomine Ge
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09A
bsor
banc
e
1000 2000 3000 Wavenumbers (cm-1)
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