Angular position and rotational velocity detection using "perfec

Details Angular position and rotational velocity detection using "perfec Angular position and rotational velocity detection using "perfec

1991-12-06

1993-08-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

341 13, G01D 534

Patent

active

052391779

ABSTRACT:
A precision temporal pulse 10 indicating accurate rotational velocity and precise angular position of a object rotating about an axis is generated. A "perfect word" 12 binary code sequence is applied to a binary code track 16 of an encoding disk 13. Binary code bits are synchronously detected as they pass through a code reader 22, that synchronously generates a bit by bit replica of the sequence of bits detected by the reader 22. The bits are stored in a shift register 28, and are synchronously compared to a stored reference value by logic circuitry. A temporal pulse is generated when the logic circuitry has identified that the stored value is equal to the reference value.

REFERENCES:
patent: 3081379 (1963-03-01), Lemelson
patent: 4047025 (1977-09-01), Lemelson
patent: 4439672 (1984-03-01), Salaman

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