Method and apparatus for the monitoring of the operation of line

Details Method and apparatus for the monitoring of the operation of line Method and apparatus for the monitoring of the operation of line

1992-12-22

1995-04-11

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340657, 340658, 250205, G08B 2100

Patent

active

054062675

ABSTRACT:
A system is disclosed for monitoring the operation of an encoder having a scale which is illuminated from a light source, in which light from the scale is detected by a detector, with the encoder having means coupled to the detector for detecting in-phase and quadrature signals representing scale position, means for detecting the phase difference between the in-phase and quadrature signals, and means responsive to the detected phase difference for adjusting the output of the light source to maintain its output at a predetermined level and for providing an error signal representing the amount of adjustment of the output of the light source.

REFERENCES:
patent: 4206456 (1980-06-01), Malinowski et al.
patent: 4581617 (1986-05-01), Yoshimoto et al.
patent: 4620094 (1986-10-01), Tani et al.
patent: 4901255 (1990-02-01), Lynn et al.
patent: 5051579 (1991-09-01), Tsukiji et al.
patent: 5302944 (1994-04-01), Curtis

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