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

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30

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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

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28

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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

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%R

efle

ctan

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1000 2000 3000 Wavenumbers (cm-1)

Nylon Fiber

Centaurµs

Palm Oil Palm Oil

10

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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

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%R

efle

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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

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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

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%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

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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)