Title:
CALIBRATION METHOD AND ANGLE MEASURING METHOD FOR AN ANGLE MEASURING DEVICE, AND ANGLE MEASURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/064317
Kind Code:
A3
Abstract:
The invention relates to a calibration method that can be carried out without a reference system for an angle measuring device having a code carrier (2) carrying an absolute position code, and at least two reading heads (1a and 1b) comprising a fixed, known angle position (4) at an angular distance, in particular of more than (50) degrees, relative to each other, in particular wherein at least one of the angle distances between adjacent reading heads (1a,1b,1c,1d) differs from the other angle distances, and each detecting the position code at least partially, such that an absolute angle position value of each reading head can be determined relative to the code carrier, wherein the code carrier can be rotated (3) relative to the reading heads, and different angle positions of the code carrier relative to the reading heads can thus be captured, comprising the steps of: determining the angle position values of the reading heads (1a and 1b) in an angular setting; determining an angular error by comparing the difference of the angle position values of the reading heads to the known angular location (4) of the reading heads (1a and 1b) relative to each other; repeating the determining of the angle position values and the angular error for a plurality of varying angle settings, and performing a mathematical analysis method, comprising determining the parameters of a mathematical function quantifying the angular error, and determining calibration parameters as parameters of the quantifying mathematical function or as a correction or code table derived from the parameters.
Inventors:
LIPPUNER HEINZ (CH)
VOKINGER URS (CH)
SIERCKS KNUT (CH)
VOKINGER URS (CH)
SIERCKS KNUT (CH)
Application Number:
PCT/EP2010/068259
Publication Date:
January 12, 2012
Filing Date:
November 25, 2010
Export Citation:
Assignee:
LEICA GEOSYSTEMS AG (CH)
LIPPUNER HEINZ (CH)
VOKINGER URS (CH)
SIERCKS KNUT (CH)
LIPPUNER HEINZ (CH)
VOKINGER URS (CH)
SIERCKS KNUT (CH)
International Classes:
G01D5/244
Foreign References:
| EP1944582A1 | 2008-07-16 | |||
| DE4009593A1 | 1991-08-08 |
Other References:
RALF D GECKELER ET AL: "Calibration of angle encoders using transfer functions", MEASUREMENT SCIENCE AND TECHNOLOGY, IOP, BRISTOL, GB LNKD- DOI:10.1088/0957-0233/17/10/036, vol. 17, no. 10, 1 October 2006 (2006-10-01), pages 2811 - 2818, XP020103247, ISSN: 0957-0233
Attorney, Agent or Firm:
KAMINSKI HARMANN PATENTANWÄLTE EST. (Vaduz, LI)
Download PDF: