Coherent Backscattering from Multiple Scattering Systems - KOPS ...
Coherent Backscattering from Multiple Scattering Systems - KOPS ...
Coherent Backscattering from Multiple Scattering Systems - KOPS ...
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5.2 The coherent backscattering cone in high resolution<br />
intensity [a.u.]<br />
1<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
1 mm<br />
2 mm<br />
3 mm<br />
4 mm<br />
5 mm<br />
6 mm<br />
7 mm<br />
9 mm<br />
10 mm<br />
11 mm<br />
12 mm<br />
13 mm<br />
14 mm<br />
15 mm<br />
16 mm<br />
0<br />
0 0.02 0.04 0.06 0.08 0.1<br />
scattering angle [deg]<br />
normalized intensity<br />
1<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
1 mm<br />
2 mm<br />
3 mm<br />
4 mm<br />
5 mm<br />
6 mm<br />
7 mm<br />
9 mm<br />
10 mm<br />
11 mm<br />
12 mm<br />
13 mm<br />
14 mm<br />
15 mm<br />
16 mm<br />
0<br />
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04<br />
scattering angle [pixels]<br />
Figure 5.11: Focus accuracy. The position of the focussing lens was varied in a range<br />
of 16 mm around its nominal position 50 cm in front of the CCD camera. The lens<br />
is positioned correctly when the width of the teflon backscattering cone (top) and the<br />
mirror spot (bottom) is minimal, i.e. between 7 and 10 mm. For higher numbers the lens<br />
is too close to the camera, for lower numbers it too far away. (To make the measurements<br />
easier to compare the data were scaled to have intensities between 0 and 1.)<br />
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