Capturing the scattering pattern
This section describes the principles of the Spraytec’s operation.
Fundamentals
The fundamentals of Spraytec spray measurement are shown in this diagram:
The process is:
.
Light from the laser
+
is scattered by the spray droplets
-
.
.
The laser beam is expanded by the collimating optics
,
to provide a wide
parallel beam.
.
The scattered light is focussed by a focussing lens
.
in a Fourier arrange-
ment and picked up by the detector array
/
.
.
Unscattered light is focussed by the focussing lens
.
, so that it passes
through the pinhole at the centre of the detector array. This is measured by
the beam power detector (detector 0) to give the light transmission.
.
The angle at which a particle diffracts light is inversely proportional to its
size. The detector array is made up of over 30 individual detectors, each of
which collects the light scattered by a particular range of angles. There is a
data channel for each of these. Measuring the angle of diffraction deter-
mines the size of the particle, as shown in the following diagram.
C H A P T E R 2
S
p
r
a
y
t
e
c
P a g e 2 . 3
1
2
3
4
5
ILL
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Summary of Contents for Spraytec
Page 1: ...Spraytec User Manual Spraytec User Manual M A N 0 3 6 8 I s s u e 1 0 N o v 2 0 0 5...
Page 7: ...Part 1 Operator s guide Part 1 Operator s guide...
Page 8: ......
Page 9: ...Introduction to this manual Introduction to this manual C H A P T E R 1...
Page 10: ......
Page 16: ...C H A P T E R 1 S p r a y t e c Page 1 6 M A N 0 3 6 8...
Page 17: ...What is the Spraytec What is the Spraytec C H A P T E R 2...
Page 18: ......
Page 31: ...The Spraytec hardware The Spraytec hardware C H A P T E R 3...
Page 32: ......
Page 42: ...C H A P T E R 3 S p r a y t e c Page 3 10 M A N 0 3 6 8...
Page 43: ...The Spraytec software The Spraytec software C H A P T E R 4...
Page 44: ......
Page 63: ...Measurement tutorial Measurement tutorial C H A P T E R 5...
Page 64: ......
Page 99: ...Interpreting the results Interpreting the results C H A P T E R 6...
Page 100: ......
Page 125: ...Using measurement files Using measurement files C H A P T E R 7...
Page 126: ......
Page 133: ...Basic maintenance Basic maintenance C H A P T E R 8...
Page 134: ......
Page 139: ...Part 2 Supervisor s guide Part 2 Supervisor s guide...
Page 140: ......
Page 141: ...Security Security C H A P T E R 9...
Page 142: ......
Page 151: ...Advanced features Advanced features C H A P T E R 1 0...
Page 152: ......
Page 170: ...C H A P T E R 1 0 S p r a y t e c Page 10 18 M A N 0 3 6 8...
Page 171: ...SOP management SOP management C H A P T E R 1 1...
Page 172: ......
Page 175: ...Part 3 Appendices Part 3 Appendices...
Page 176: ......
Page 177: ...Health and Safety Health and Safety A P P E N D I X A...
Page 178: ......
Page 184: ...A P P E N D I X A S p r a y t e c Page A 6 M A N 0 3 6 8...
Page 185: ...Specification Specification A P P E N D I X B...
Page 186: ......
Page 191: ...Site requirements f r o m M A N 0 3 6 8 I s s u e 1 0 Site requirements A P P E N D I X C...
Page 200: ...A P P E N D I X D S p r a y t e c Page D 3 M A N 0 3 6 8...
Page 201: ...Installation Installation A P P E N D I X E...
Page 202: ......
Page 206: ...A P P E N D I X E S p r a y t e c Page E 4 M A N 0 3 6 8...
Page 207: ...Regulatory statements Regulatory statements A P P E N D I X F...
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Page 213: ...Index Index...
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