METHOD FOR PHASE SHIFT ANGLE DEFINING BETWEEN TWO SIGNALS REPRESENTED BY DIGITAL READINGS Russian patent published in 2008 - IPC G01R25/00 

FIELD: measurement equipment.

SUBSTANCE: according to method, defining points of signal transit from negative to positive values through zero level is performed by storing each digital reading as current a(t_j) corresponding to current time moment t_j, and previous a(t_j-1), further comparison of a(t_j-1) and a(t_j)reading values. On comparison basis, numbers of count impulses w and i corresponding to time moments t_w and t_i are defined, at which first signal a(t_j) transit from negative to positive value through zero level occurs, further these records are used for linear interpolation of signal and defining of time moment t_n1 corresponding to first signal a(t_j) transit from negative to positive value through zero level. Then time moment t_n2 corresponding to second signal a(t_j) transit from negative to positive value through zero level is defined by similar procedure. Phase φ_a of first signal is defined, and simultaneously phase φ_b of second signal is defined by similar procedure, and phase shift angle between a(t) and b(t) signals is defined as difference of φ_a and φ_b.

EFFECT: possible defining of phase shift angles between two signals of both sinusoid and non-sinusoid form, represented by digital readings with constant sampling interval.

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