Method and apparatus for thickness measurement
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsPeter Schmitt, Guenther Kostka
Life of this patent
Estimating the term…
Abstract
The material strength of extensive objects can be determined efficiently by using two distance measures, wherein a first distance measurer determines the distance to a first main surface of the object and a second distance measurer determines the distance to a second main surface object opposing the first main surface. If potential measurement errors due to the extensive geometry are avoided by determining a reference distance between the first distance measurer and the second distance measurer by a reference object, the thickness of the object between the first main surface and the second main surface can be determined with high accuracy and velocity.
Claims15
1-15. (canceled)
A measuring apparatus for determining the material strength of an object, comprising:
- a reference object of a predetermined thickness between a first reference main surface and a second reference main surface, wherein the first reference main surface is facing a first distance measurer and the second reference main surface is facing a second distance measurer;
- wherein the first distance measurer is implemented as light-slit measurer for simultaneously determining a first distance between the first distance measurer and a first main surface of the object facing the first distance measurer as well as a distance between the first reference main surface and the first distance measurer in measurement direction;
- and wherein
- the second distance measurer is implemented as light-slit measurer for simultaneously determining a second distance between the second distance measurer and a second main surface of the object opposing the first main surface as well as a distance between the second distance measurer and the second reference main surface in measurement direction;
- and
- an evaluator for determining the material strength of the object between the first main surface and the second main surface by using the first distance, the second distance, the predetermined thickness, the distance between the first reference main surface and the first distance measurer, and the distance between the second reference main surface and the second distance measurer.
A method for determining the material strength of an object, comprising:
- determining a first distance between a first distance measurer implemented as light-slit measurer and a first main surface of the object facing the first distance measurer in a measurement direction substantially perpendicular to the first main surface of the object and
- simultaneously determining a distance between a first reference main surface of a reference object of a predetermined thickness and the first distance measurer in the measurement direction;
- determining a second distance between a second distance measurer implemented as light-slit measurer and a second main surface of the object opposing the first main surface in measurement direction and simultaneously
- determining a distance between a second reference main surface of the reference object opposing the first main surface and the second distance measurer in the measurement direction;
- and
- determining the material strength of the object between the first main surface and the second main surface by using the first and second distances as well as the predetermined thickness, the distance between the first reference main surface and the first distance measurer and the distance between the second reference main surface and the second distance measurer.
Dependencies are inferred from the claim text.