Displacement measuring apparatus

Details Displacement measuring apparatus Displacement measuring apparatus

1986-01-09

1987-03-31

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

250231SE, 340347M, 324175, H03M 126

Patent

active

046546367

ABSTRACT:
A shaft angle encoder comprises a code disc (21) mountable coaxially upon a rotary shaft (20) whose angular position is to be continuously measured. Coarse-bit angular position data are encoded digitally in Gray code by a pattern of opaque and transparent sectors provided on a plurality of inner annular tracks on the code disc (21). Fine-bit angular position data are encoded in analog triangular waveforms generated by the outermost annular track on the code disc (21). The analog position data are converted to fine-bit digital values, which are combined with coarse-bit digital values to obtain an angular position measurement. Alignment of the fine-bit digital values with the coarse-bit digital values obtained from the Gray code position data is accomplished by using information provided by overlapping the least significant bit of the coarse-bit digital values with the most significant bit of the fine-code digital values.

REFERENCES:
patent: 4228396 (1980-10-01), Palombo et al.

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