Depth Profiling of Composition - MTEC Photoacoustics

tobascothwackUrban and Civil

Nov 15, 2013 (3 years and 4 months ago)

40 views

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 Puck

Ball Joint

Puck

Adhesive


Polymer
Layers

o
r Gradient

Lapped

Surface

10 mm

Sample

Lapper Motion

Loading

Mass

Rotating

Micro
-
Abrasive

Ball Joint

Rotating

Puck

Timer

Blow
-
off Jet

Oscillating Lapper Arm

Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
0 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
3 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
5 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
7 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
9 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
11 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
13 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
15 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
17 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
19 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
22 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
24 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
26 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
28 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
30 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
31 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
32 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
33 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
35 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
36 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
37 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
38 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
39 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
40 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
41 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
43 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
44 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
45 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
46 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
47 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
49 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
50 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
51 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
52 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
53 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
54 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
55 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
56 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
57 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
58 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
60 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
62 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
64 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
66 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
68 microns
70 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
72 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
74 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
76 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
78 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
80 microns
Wavenumber (cm
-1
)
500
1000
1500
2000
2500
3000
3500
4000
PAS Intensity (arb. units)
0
25
50
75
100
125
150
175
200
81 microns
0



10


50


60


70


80


20


30


40


PolyProp

Transition

PolyProp

EVOH

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
)
800
1000
1200
1400
1600
1800
2000
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 Found

in 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