X-ray or gamma ray systems or devices – Specific application – Fluorescence
Patent
1998-03-12
2000-03-14
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Fluorescence
378 44, G01B 1502
Patent
active
060382805
ABSTRACT:
The invention relates to a method for measuring the thicknesses of thin layers by X-ray fluorescence, in which a specimen having the layer to be studied is positioned in view and subsequently X-radiation is directed onto the layer to be studied and emitted fluorescent radiation is detected by means of a radiation detector and the layer thickness is determined, in which on positioning the specimen there is a focussing by adjusting a focussing element along its optical axis and the position of the focussing element is determined with the layer in focus. An apparatus for layer thickness measurement with X-ray fluorescence according to the invention having a X-ray tube, a detector and an observing device with a focussing element provides for the latter to be movably mounted along its optical axis and provided with a position measuring device. This obviates the need for having to move a workpiece-carrying table in such a way that the work surface comes to rest at a predetermined, specific measuring distance or spacing.
REFERENCES:
patent: 4534049 (1985-08-01), Koga
patent: 4597093 (1986-06-01), Fischer
patent: 5299252 (1994-03-01), Takahashi
Kaiser Karl-Heinz
Rossiger Volker
Church Craig E.
Helmut Fischer GmbH & Co. Institut Fur Electronik Und Messtechni
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