Patent · US Active

Method and measuring machine for determining dimensional properties of a measurement object

US9826201B2 · kind B2 · utility

1Cited by

4References

15Claims

0Family size

Assignee

Carl Zeiss Industrielle Messtechnik GmbH · DE

Inventors

Aksel Goehnermeier · Aalen, DE
Philipp Jester · Heidenheim, DE
Frank Widulle · Neu-Ulm, DE

Key dates

Filing date	Jul 28, 2016
Grant date	Nov 21, 2017
Priority date	—
Expiry date	Jul 28, 2036

Classification

Technology area (CPC G)Physics
CPC primaryG01B11/24
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A method and a measuring machine for determining dimensional properties of a measurement object each use a workpiece table and a camera having an image sensor and an imaging optics. The imaging optics exhibits aberrations and is configured to be focused on a plurality of different working positions relative to the workpiece table. The aberrations are minimized by using first calibration values provided for a defined working position. A first working distance of the camera relative to a region of interest is determined. Subsequently, the imaging optics is focused, using the first working distance and using second calibration values that represent an image field curvature of the camera, such that the region of interest is substantially brought into a defined working position. Subsequently, the image recording and image evaluation take place to determine measurement values that represent the dimensional properties of the measurement object in the region of interest.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.