| 摘要 |
FIELD: physics, measurement. ^ 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(tj) corresponding to current time moment tj, and previous a(tj-1), further comparison of a(tj-1) and a(tj) reading values. On comparison basis, numbers of count impulses w and i corresponding to time moments tw and ti are defined, at which first signal a(tj) transit from negative to positive value through zero level occurs, and a(tp) reading value corresponding to ti+1 time moment is stored; further these records are used for parabolic interpolation by square trinomial and defining of time moment tn1 corresponding to first signal a(tj) transit from negative to positive value through zero level. Then time moment tn2 corresponding to second signal a(tj) transit from negative to positive value through zero level is defined by similar procedure. Phase &phis;a of first signal is defined, and simultaneously phase &phis;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 &phis;a and &phis;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. ^ 2 dwg |
