METHOD FOR DETERMINING PHASE SHIFT BETWEEN TWO SINE-WAVE SIGNALS Russian patent published in 1995 - IPC

FIELD: measurement technology. SUBSTANCE: phase shift F₀ between two signals x(t) and y(t) filtered off d.c. component is determined by means of two instant values of one of signals assumed as measuring signal at time moments t₀₁ and t₁; first signal is selected when reference signal y(t) equals zero and second one, at half-wave center of signal y(t); then phase shift F₀ between signals is found from equation given in description of invention. EFFECT: reduced phase-shift measurement error at phase shifts approaching 0 or 180 deg even at infralow frequencies; permitted d c component in one of signals when measuring phase shift of value approaching 45 or 135 deg. 2 dwg