Processing quadrature signals

Details Processing quadrature signals Processing quadrature signals

1987-12-09

1989-09-05

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrical speed measuring

Speed comparing means

324160, 340672, 361239, G01P 356

Patent

active

048642304

ABSTRACT:
Quadrature input signals from an opto-electronic or magnetic readhead which is movable relative to a periodically marked scale, are respectively multiplied by quadrature reference signals from a reference oscillator in multipliers. The resulting signals are added together in a mixer to give a signal (S) having a frequency which is the reference frequency shifted by the frequency of the input signals. This signal (S) is then compared with the reference signal. The reference signals are generated from a high frequency clock which is subsequently used to compare the period of the reference signal with that of the signal (S), giving outputs which interpolate the position of the readhead within the pitch of the marks on the scale.

REFERENCES:
patent: 3501651 (1970-03-01), Cottrell
patent: 3597749 (1971-08-01), Uemura et al.
patent: 3629705 (1971-12-01), Walters
patent: 4199800 (1980-04-01), Weit
patent: 4453550 (1969-07-01), Kuck
patent: 4468617 (1984-08-01), Ringwall
Boyes, "Synchro and Resolver Conversion", 1980, Chapter III, pp. 43-78.
Pettavel et al., "Omnisip, a New, Three-Dimensional Measuring Head", Technische Rundschau, 41/86, pp. 178-182, 1986.

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