FISCHER FISCHERSCOPE X-RAY 5000 Series, Operator'S Manual

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14 FISCHERSCOPE
®
X-RAY
Instrument Overview Functional Principle of the Instrument
3. The aperture (collimator) limits the cross-section of the primary beam in order to excite
a measurement spot of a defined size.
4. The primary x-radiation impacts the atoms on the sample surface (coating layer and
base material) and in the process knocks electrons from the inner electron shell.
Electrons from outer electron shells fill the resultant voids emitting a fluorescence
radiation that is characteristic in its energy distribution for a particular material.
5. The energy dispersive detector measures the energy distribution of the fluorescence
radiation. A multistage electronics circuit processes the measurement signals.
6. The measured spectrum shows lines or peaks that are characteristic for the chemical
elements in the sample.
7. The WinFTM Software computes the thickness of the coating(s) and/or the analysis
result.