Data processing: measuring – calibrating – or testing – Measurement system – Orientation or position
Reexamination Certificate
2008-07-07
2010-11-23
Dunn, Drew A (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Orientation or position
Reexamination Certificate
active
07840372
ABSTRACT:
A self-calibration method and apparatus for on-axis rotary encoders comprising the steps of: receiving output signals from a detector during a spindle-free response period, the signals including a plurality of data sets wherein each data set comprises the periods between sampling events occurring in one revolution of the encoder at an angular speed, selecting a data set pair from the output signals, wherein the data set pair contains two linearly uncorrelated data sets; defining a model of the angular distances between each sampling event occurring in one revolution of the encoder as a function of one or more damping coefficients and the periods between each sampling event as contained in the data set pair; solving the model for the angular distances for the data set pair using circular closure and dynamic reversal techniques; and establishing an encoder error map using the selected solved angular distances from the model.
REFERENCES:
patent: 4593193 (1986-06-01), Michaelis
patent: 5138564 (1992-08-01), de Jong
patent: 5889534 (1999-03-01), Johnson
patent: 6145368 (2000-11-01), Klein
patent: 6304825 (2001-10-01), Nowak
patent: 2004/0179885 (2004-09-01), Adkins
patent: 1103815 (2001-05-01), None
patent: 1480004 (2004-11-01), None
patent: 03036238 (2003-05-01), None
patent: 2005124289 (2005-12-01), None
Estler, W.T., Queen, Y.T., 1993, An advanced Angle Metrology System, Annals of the CIRP, 42(1):573-576.
Estler, W.T., 1998, Uncertainty Analysis for Angle Calibrations using Circle Closure, J. Res. Natl. Inst. Stand. Technol., 103(2):141-151.
Filatov, Y.V., Loukianov, D.P., Probst, R., 1997, Dynamic Angle Measurement by Means of a Ring Laser, Metrologia, 34:343-351.
Geckeler, R.D., Fricke, A., Elster, C., Sep. 20, 2006, Calibration of Angle Encoders Using Transfer Functions, Meas. Sci. Technol, 17:2811-2818.
Lu, X.D. and Trumper, D.L., Self-Calibration of On-Axis Rotary Encoders, Annals of the CIRP, vol. 56/1/2007.
Lu, Xiaodong and Trumper, David L., Self-Calibration for Air-Bearing Mounted Rotary Encoders, Oct. 15, 2006.
Masuda, T., Kajitani, M., 1989, An Automatic Calibration System for Angular Encoders, Precision Engineering, 11 (2):95-100.
Moore, W.R., 1970, Foundations of Mechanical Accuracy, Chapter 3, pp. 204-250. The Moore Special Tool Co., Bridgeport, CT, USA.
Orton, P.A., Poliakoff, J.F., Hatiris, E., Thomas, P.D., 2001, Automatic Self-Calibration of an Incremental Motion Encoder, 2001 IEEE Instrum. Meas. Technol. Conf. , 1617-1618.
Probst, R., Wittekopf, R., Krause, M., Dangschat, H., Ernst, A., Mar. 4, 1998, The New PTB Angle Comparator, Meas. Sci. Techno., 9:1059-1066.
Watanabe, T., Fujimoto, H., Nakayama, K., Masuda, T., Kajitani, M., 2003, Automatic High Precision Calibration System for Angle Encoders, Proc. of SPIE, 5190:400-409.
Watanabe, T., Fujimoto, H., Masuda, T., 2005, Self-Calibration Rotary Encoder, 7th Int., Sym, Meas., Technol. Intellig. Instrum., 240-245.
Zhang, G.X., Wang, C.H., Li, Z., 1994, Improving the Accuracy of Angle Measurement System with Optical Grating, Annals of the CIRP, 43(1):457-460.
Cherry Stephen J
Dunn Drew A
Jeffer Mangels Butler & Mitchell LLP
The University of British Columbia
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