Automatic encoder resolution calibration and length...

Details Automatic encoder resolution calibration and length... Automatic encoder resolution calibration and length...

2006-03-14

2006-03-14

Pham, Hoa Q. (Department: 2877)

Optics: measuring and testing

Position or displacement

Position transverse to viewing axis

C356S634000, C250S231130, C250S231160

Reexamination Certificate

active

07012703

ABSTRACT:
The invention is a system and method for automatically determining a resolution of an encoder, automatically calibrating the encoder resolution, and automatically determining a length of a workpiece from the encoder resolution and encoder count. The system comprises an encoder for generating an encoder signal indicative of linear movement of a moving workpiece traveling along a path. The system also comprises a first sensor positioned along the path traveled by the workpiece, the first sensor generating a first sensor signal in response to sensing an identifying characteristic of the workpiece. The system further comprises a second sensor positioned along the path traveled by the workpiece, the second sensor generating a second sensor signal in response to sensing the identifying characteristic of the workpiece, said second sensor being positioned a known distance from the first sensor along the path traveled by the workpiece. The system also comprises a processor for determining the encoder resolution as a function of the encoder signal, the first sensor signal, the second sensor signal, and the known distance between the first and second sensors.

REFERENCES:
patent: 4998798 (1991-03-01), Ishizuka et al.
patent: 5065013 (1991-11-01), Taylor
patent: 5383014 (1995-01-01), Nowak et al.
patent: 6052192 (2000-04-01), Harris et al.
patent: 2005/0133705 (2005-06-01), Hare et al.

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