Method and reference model for checking a measuring system

US9462993B2 · kind B2 · utility

Assignee

• SIRONA Dental Systems GmbH · DE

Inventors

• Björn Popilka · Hemsbach, DE
• Volker Wedler · Hirschberg, DE
• Anders Adamson · Darmstadt, DE
• Frank Thiel · Oberramstadt, DE

Key dates

• Filing date: Jan 28, 2013
• Grant date: Oct 11, 2016
• Expiry date: Mar 30, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G09B23/283
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention relates to a reference object (3) and a method for checking a measuring system (1), wherein a plurality of three-dimensional recordings (4, 8) of a reference object are recorded from different recording directions (5) by means of the measuring system (1). The reference object (3) has a closed shape, wherein each of the three-dimensional recordings (4) is registered with at least the preceding recording (4). In the case of a faulty calibration and/or in the case of a faulty registration, the individual recordings (4, 8) are deformed compared to the actual shape of the reference object (3), so that the deformation continues when assembling the individual three-dimensional recordings (4) to form an overall recording (54) and the generated overall recording (54) deviates in its dimensions from the dimensions of the reference object (3) as a result thereof. At least one object region (10) of the reference object (3) is measured twice, at the beginning of a circuit and at the end of the circuit, wherein a distance (55) is determined in the overall recording (54) between a first position of the object region (10) in a first recording at the beginning of the circuit and a sec…