microlap technology depth profiling of composition some samples are too opaque to allow the ir beam...
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MicroLap Technology Depth Profiling of Composition
Some samples are too opaque to allow the IR beam to penetrate to the depth of interest. Spectral overlaps may also interfere with depth profiling.In these cases a micro-lapping approach allows spectra to be measured layer-by-layer.In other cases micro-lapping can be used to calibrate PAS non destructive depth profiling during methods development.
Depth Profiling Using the MicroLap Process
1. Measure Thickness
2. Measure Spectrum
3. Lap off a Layer
4. Repeat layer by Layer
MTEC MicroLapper and Thickness Gage
Lapping PuckBall Joint
PuckAdhesive
Polymer Layersor Gradient
LappedSurface
10 mm
Sample
Lapper Motion
LoadingMass
RotatingMicro-Abrasive
Ball Joint
RotatingPuck
Timer
Blow-off Jet
Oscillating Lapper Arm
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
2000 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
2003 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
2005 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
2007 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
2009 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20011 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20013 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20015 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20017 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20019 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20022 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20024 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20026 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20028 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20030 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20031 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20032 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20033 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20035 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20036 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20037 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20038 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20039 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20040 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20041 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20043 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
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20044 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
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20045 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20046 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20047 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20049 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20050 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20051 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
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20052 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20053 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20054 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20055 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20056 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20057 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20058 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20060 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20062 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20064 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20066 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20068 microns70 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
200
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20072 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20074 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20076 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20078 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20080 microns
Wavenumber (cm-1)
5001000150020002500300035004000
PAS
Inte
nsit
y (a
rb. u
nits
)
0
25
50
75
100
125
150
175
20081 microns
0 10 50 60 70 8020 30 40
PolyProp
TransitionPolyPropEVOH
Successive Spectra Measured as a Function of Depth
PAS Analysis of Composite Scorching
Scorching occurs when jet exhaust strikes nearby aircraft (navy carrier decks).
Carbon fiber/BMI panel scorched with air stream at 617 °C for 15 seconds. No visible change.
PA spectra taken as material removed by microlapping.
PA Spectra Taken During Microlapping of Scorched Area
Wavenumber (cm-1)
800100012001400160018002000
Scorched Surface
34 µm deep
57 µm deep
81 µm deep
Unscorched
Peak Height Ratios versus Depth into Scorch
Damaged Transition Undamaged
Additional Information Can Be Foundin the MTEC Applications Library:
Microlap Depth Profiling of a Paper Coating
MicroLap Depth Profiling of Automobile Paint Weathering
Quantitative Depth Profiling Saturation-Equalized Photoacoustic Spectra