SU398889A1 - METHOD OF MEASURING PHASE SHEETS IN - Google Patents

Description

one

The invention relates to the field of phase-measuring technology and can be used to create multi-channel phase-measuring devices.

The known methods for measuring phase shifts in asynchronous time division systems, based on switching measured and reference sinusoidal voltages, determining time intervals at zero amplitudes and summing up the reference frequency in a forward or reverse code, require a long measurement time.

In order to increase the measurement speed, a method is proposed in which the first passage through the zero of the reference and measured sinusoidal stresses, regardless of their direction, is taken over the measured time interval, generate signs of the order of arrival of the first two half-waves and compare their polarity x, a constant number proportional to the phase shift value of 180 ° is entered into the adder, and on the basis of priority, the measurement result is read in a forward or reverse code.

The drawing shows the block diagram of the device that implements the described method. It contains a block of 1 sensors of reference (on) and measuring (measurment) signals, switch

2, the zero-organs 3 and 4, the converter 5 is a time-pulse modulation into a number, a sequencing unit 6, an adder 7, a recorder 8, a multi-polarity analyzer 9, a key 10 and a setting unit 11.

The process of measuring the phase shift is as follows.

The measuring (measurment) and reference (op) signals from sensor unit 1 are fed in channel channel in different phases through switch 2 to null organs 3 and 4. The measurement is started from the first impulse {Upzm or formed by one of null organs 3 or 4 when the amplitude of the voltage is zero, the measuring or reference signal, regardless of the polarity of their half-waves. During the formation of the first pulse of the measuring signal from the output of the zero-organ 3, the pulse arrives at the transducer 5 time-pulse modulation into a number and block 6 for determining the priority. A pulse from the queuing unit acts on the adder 7 for reading in the reverse code. The arrival of the second pulse from the output of the nullor 4 to the converter stops the delivery of pulses of the reference frequency to the adder. The counted number of pulses is recorded by the adder on the recorder 8.

In the case of the formation of the first pulse of the reference signal from the zero-organ output 4, a pulse is applied to the converter 5 and the reference frequency is read in the forward code.

Thus, if the measurement is performed from the reference to the measurement signal, the result is read in the forward code, and in the measurement from the measurement to the reference signal, the reading of the measurement result is produced in the reverse code.

The voltages of the reference and measurement signals, depending on the magnitude of the phase shift, can be of different polarity. When the phase shift angle is less than 180 °, then the voltage of the reference and measurement signal of the monopole, and in the case of a phase shift greater than 180 °, the voltage of these signals is unipolar.

To provide the possibility of measuring the phase shift at opposite voltage voltages, a comparison of the polarity of the half-waves is introduced. The pulses from the outputs of the zero-organs 3 and 4 are fed to the analyzer 9 of different polarities, which, at different directions of the currents of the reference and measuring voltage, generates a pulse, acting on the key 10, and from the unit 11 through the key 10 pa the adder 7 receives a constant a number, ironorizing the phase shift by 180 °, summed with the measured number of impulses of the reference frequency.

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Thus, the time taken to measure in a single-channel package is equal to or less than the half-period of the measured signal.

Subject invention

A method of measuring phase shifts in asynchronous time division systems based on switching measured and reference sinusoidal voltages, determining time intervals when reducing amplitudes of slave zero voltages, and summing the reference frequency in a forward or reverse code, characterized by in order to increase the measurement speed, for the measured time interval, the first passage through zero of the reference and measured sinusoidal stresses, regardless of their direction, is taken, vayut signs ocherediosti arrival peryh two half-waves and comparing their polarity, and when Hetero-polar voltages to the adder administered constant number proportional to the phase shift value of 180 °, and on the basis of priority of the measurement result is read in the forward or reverse code.