Method and apparatus for producing an analogue output proportion

Details Method and apparatus for producing an analogue output proportion Method and apparatus for producing an analogue output proportion

1977-05-26

1979-05-01

Corcoran, Robert J.

Electricity: measuring and testing

Electrical speed measuring

Including speed analog electrical signal generator

324179, 324186, 340347AD, 364565, G01P 344

Patent

active

041526457

ABSTRACT:
A system and method for measuring the rotational speed of a variable speed drive shaft for a ship or the like with high accuracy over a wide range of speeds. Means associated with the shaft sense the time interval for each turn of the shaft, or fraction thereof. Such time interval is accurately measured and then converted to an r.p.m. value. Steps in the method include counting the number of cycles of an oscillating signal in binary form to measure the time interval for each turn, selecting a most significant portion of bits within the number counted, determining the positional weight of the most significant bit to obtain a scaling factor, and producing a voltage inversely proportional to the value of the selected portion of bits, which voltage is then scaled by the scaling factor.

REFERENCES:
patent: 3729989 (1973-05-01), Little
patent: 3935537 (1976-01-01), Batchelor
Harrison, T. J.; Logarithmic D/A Converter; IBM Tech. Bull.; vol. 5, No. 5; Oct. 1962; pp. 30-31.

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