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<strong>EDAX</strong> Detector Geometry<br />
The elevation angle (EA) is the angle<br />
between the horizontal and the detector<br />
normal. The intersection distance (ID) is the<br />
distance in mm between the pole piece<br />
where the electron beam intersects the<br />
detector normal. The azimuth angle can not<br />
be shown in a cross-sectional view as<br />
shown at the left, but it is the angle as<br />
viewed from above between the detector<br />
normal and normal to the tilt axis. The<br />
working distance (WD) is where the sample<br />
is in mm below the pole piece. The take-off<br />
angle (TOA) is the angle between the x-ray trajectory and the sample surface. If the sample is<br />
placed at the intersection distance and not tilted, the take-off angle will equal the elevation angle.<br />
If the working distance is shorter than<br />
the intersection distance, the take-off<br />
angle will be less than the elevation<br />
angle. This assumes that the sample is<br />
smooth and not tilted.<br />
If the working distance is longer than<br />
the intersection distance, the take-off<br />
angle will be more than the elevation<br />
angle. Again, this assumes that the<br />
sample is smooth and not tilted.<br />
If the sample is tilted toward the detector,<br />
the take-off angle will be greater<br />
than the elevation angle. If the sample<br />
were tilted away from the detector, the<br />
take-off angle would be less than the<br />
elevation angle. Note that the azimuth<br />
angle must be taken into account to<br />
determine the take-off angle.<br />
<strong>EDAX</strong> Phoenix Training Course - <strong>EDAX</strong> Detector Geometry - page 1
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