SU1330577A1 - Method of measuring phase shift - Google Patents

Abstract

The invention relates to the field of electrical measurements and can be used to measure phase shifts with increased accuracy and noise immunity. The aim of the invention is to improve the accuracy and reduce the measurement time, i.e. Increase speed. The device implementing the method comprises a converter 1, multipliers 2 and 3 of instantaneous values of the signals, integrators 4 and 5, quadrant 6, meter 7 of the ratio of two signals, analyzer 8 of maximum signals and generator 9 of the reference signal. The proposed method has a more limited use, since as a result of the processing and conversion of signals performed, the range of measured shifts is limited to 0-180 by this method. In this case, the magnitude of the phase shift is equal to the number of the converter 1 having the maximum value of the signal. 1 il. (L.

Description

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The invention relates to methods for electro-radio measurements of pg can be used to measure the phase shift of signals, with increased accuracy and noise immunity.

The aim of the invention is to improve the accuracy and reduce the measurement time.

The drawing shows a diagram of a device that implements the proposed method.

The device contains converters 1, variable multipliers 2 and 3 instantaneous signals, integrators 4 and 5, a signal multiplier (quad) 6, a meter 7 for the ratio of two signals, a signal maximum analyzer 8 and a reference signal generator 9, each with 1 multiplier 2, the first input of which is connected to the input of the device, and the second to the reference signal generator 9, the integrator 4 and the multiplier 6, the output of which is connected to the first input, meter 7 of the ratio of two signals, are connected in series, alternating resident 3, both inputs of which are connected to the generator 9, the reference signal 5 .i integrator whose output is connected to a second input of ratio meter 7, also are connected in series; the outputs of each meter 7 are the ratios of two signals connected to the analyzer 8 of the maximum signal.

The device works as follows

The input signals S (t) are fed to the first inputs of multipliers 2 transducers 1, the second inputs of which and both inputs of multipliers 3 of all transducers 1 receive reference signals from the generator 9 of reference signals. Different converters (the number of converters in the general case is equal to n) receive reference signals with different phase shifts. The results of multiplying the instantaneous values of the signals S (t) So (t, 50 Cf) from the multipliers 2 and S (t, cp) from the multipliers (quadrs) 3 go to integrators 4 and 5, where they are integrated over time T.

Signals from integrators 4 are fed to quadrants 6 (similarly to quadtors 3 quadrants 6 can be implemented as multipliers, one input of which is fed to one signal), from the output of which the signal t acts,

Js (t)

So (t, Cf)

which is fed to the first input of the meter 7 Шeni, the second input of which receives a signal from the integration of 15 tori 5. Signals are taken from the outputs of the meter 7 from the load, proportional to ratio.

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rjs (t) Sjl:, q) dtJ / J S (t, q) d

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which are fed to a maximum analyzer 8.

The latter selects a converter, the output of which 25 is the maximum signal. Based on the number of the converter with the maximum signal, the measured phase shift is determined.

The application of the proposed method is limited by the fact that the expectation m (n) always has a positive value regardless of the correlation integral

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s (t) S (t, C |) dt.

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In this connection, the maximum m ((f) will occur at two values of the phase shift of the reference signal: at a phase shift of the reference signal equal to the measured phase shift, and a phase shift shifted by 180, i.e. the range of measured shifts the proposed method is limited to 45 0-180 °. At the same time, the magnitude of the phase shift is equal to the number of the converter 1 having the maximum value of the signal.

Claims (1)

Invention Formula The method of measuring the phase shift, which consists in multiplying the reference and measured signals at par From the outputs of the integrators 4 and 5, they remove 55 phase shifts between them, and no signals: they tag the results of the multiplication Js (t) S (t, tf) dtj (t, q) dt. Signals from integrators 4 are fed to quadrants 6 (similarly to quadtors 3, quadrants 6 can be implemented as multipliers, both of which have one signal), the output of which is valid t Js (t) So (t, Cf) which is fed to the first input of the meter 7 Шeni, the second input of which receives a signal from the integrators 5. Signals are taken from the outputs of the 7 ratios, proportional to the ratio. h h t4 national Ty G fdg. rjs (t) Sjl:, q) dtJ / J S (t, q) dt, oo which are fed to a maximum analyzer 8. The latter selects the converter, the output of which operates the maximum signal. Based on the number of the converter with the maximum signal, the measured phase shift is determined. The application of the proposed method is limited by the fact that the expectation m (n) always has a positive value regardless of the correction integral. t s (t) S (t, C |) dt. 50 40 In this connection, the maximum m ((f) will take place at two values of the phase shift of the reference signal: at a phase shift of the reference signal equal to the phase shift being measured, and a phase shift shifted by 180, i.e., the measuring range. The proposed shifts by the proposed method are limited to 45 0-180 °. At the same time, the magnitude of the phase shift is equal to the number of the converter 1 having the maximum signal value. Invention Formula The method of measuring the phase shift, which consists in multiplying the reference and measured signals when the phase is determined, determines the magnitude of the phase shift when changing and measuring the phase of the reference signal until a maximum value is obtained. maximum result, distinctive reference and measurable signals u and with the fact that, in order to improve the {result of integrating the instantaneous accuracy of precision and reducing the time values of the reference signal, measurements, instantaneous values of amp-maximum measurement result The lit signals of the reference signal are raised. The value of the phase signal is raised. square and integrate, also vozvodokh shift, at the same time for true squared result integration of phase shift accept the results of multiplied support and measurements corresponding to positive signals are measured, the ratio Q is the integral value of the multiplied square integration of the multiplied-reference and measurable signals.