SU424085A1 - Phase meter - Google Patents

Description

one

The invention relates to phase-measuring technology. A phasometer is known, containing olorly and measuring channels, each consisting of a series-connected frequency divider and frequency divider, separate outputs, and the phase-sensing circuit, two followings, detailed electronic switches, one of which is connected to the outputs phase-sensitive circuit and generator Vulgar, and the second key is connected to the time of the master circuit and the meter

The disadvantages of the known phase meters are the presence of a "dead zone near zero."

The purpose of the invention is to increase the accuracy and phase measurement near zero, to simplify the circuit and to increase the reliability of the phase meter.

This is achieved by the fact that the proposed phase meter is equipped with two coincidence circuits, two more complementary forms and a trigger, the output of the first coincidence circuit connected by one input to the output of the reference drift, and the second time of the master circuit to the output with the input of the nerve supplemental driver, the output of the latter is connected with the input of the installer “On the trigger, input setting“ 1 of which is connected to the output of the second co-ownership scheme, whose input input is connected to the output of the measuring device about the channel, and the potential control input through the integrated circuit - to the output of the “1 flip-flop” installation, one of the outputs of which is connected to the input by the “About the frequency divider of the measuring channel” through the second additional driver. On fn1G. 1 shows a block-cxe ia of the proposed phase shift; pas figs. 2 - vrs.msn-ry diagrams. We.

The phase meter consists ns form, worlds 1 and 2,

divider frequency 3 and 4. phase circuit 5, electric: py keys 7 and 7, counting 8, pulse generator 9, time setting circuit 10, coincidence circuits 11 and 12, drivers 13 and 14, integrating the second and 15

trigger 16.

The time-setting circuit 10 has exits 17 and 18.

The timing charts shown in FIG. 2, illustrate the operation of phase merr. Here

a - nytulsy at the output of the imager 1, b - impulses on the output 17 time of the master circuit 10, e - impulses at the output 18 time of the master circuit 10, g - impulses at the output of the imager 13, (-pulses on the output of the frequency divider 3, e - and the pulses of the output of the driver 2, the pulses of the pulses at the output of the trigger 16, h - the total voltage of the voltages of both inputs of the matrix of the potential-potential joint arrangement 12 (for convenience of the situation of both inputs are summed up),

and - impulses at the output of the forming unit 14, k-impulses at the output of the frequency divider 4, l - impulses at the output of the key 6, m-impulses at the output of 1 КЛУЧ1а 7.

Before the beginning of each new time measurement cycle, the master circuit generates an Impulse 18 at the output 18 (Fig. 20, BpeMfiiHH ti-ta interval), which arrives at the control input of the coincidence circuit 11 and opens it at the time interval ti / 3 . One of the ims generated by shaper 1, which coincides in time with the interval ti-tz, passes through the coincidence circuit 11 and starts the shaper 13. In the case of code 01, it is difficult to ensure the required pulse duration at the output 18 of the master circuit 10 and the input shaper can the number of impulses is more painful than a trigger can be put between the co-fall 11 circuit and the former 13, the input of the installation “About which is connected with the output 17 of the circuit 10.

It; bullets | C, resulting from this pa output of shaper 13 (fig. 2 g, time instant / 2), sets in the state “About frequency divider 3 (or makes it impossible to change its state by frequency divider 3 under the influence of input pulses, if it is in front of it in the state “O) and trigger 16 (Fig. 3d and g, respectively, time t). As a result of switching the trig / repia 16 to the state "O" at the output of the integrating circuit 15, the voltage starts to decrease in the direction of unlocking the coincidence circuit 12 and it reaches the unlocking level (zero) next in time interval A / (Fig. 2h). The delay and the voltage at the output of the integrating circuit 15 (the time interval to zero is chosen based on the maximum possible change in the phase shift between the studied oscillations in one measurement cycle. In most cases, setting the time At is sufficient to equal the time interval between the studied oscillations formed, shifted in phase by 90 °. In the case under consideration, the phase shift between the studied oscillations at the beginning of the measurement time is 10 °. Therefore, the output of the installation "1 trigger 16 through the co Only the second (Fig. 2h, time ti) produced by shaper 2 at time 4 is pulsed 1 (at the moment of arrival of the first pulse, the nursery circuit 12 is still locked) passes through Addition 12. As a result, trigger 16 returns to its initial state O at time 4 (Fig. 2g) and starts the shaper 14. At this moment, the frequency divider 3 is set to the state "O" (Fig. 2k, time 4J- Thus, IB proposes the phase meter in the considered case before the measurement starts between the output signals frequency dividers 3 and 4, a time shift is established proportional to 360 ° + f.

It should be noted that the representation of the measured angle in the form of 360 ° - + - f is not always convenient. However, subtracting a fixed value of 360 ° from the final result does not cause technical difficulties. This can be done by automatically setting the counter to 8 V, "0 after reaching an angle in the latter result, which is proportional to 360 °. Angles greater than the phase shift, proportional to the interval A, are measured with a phase meter as (Fig. 2 b) time interval 62 In the case of use (bipolar light is used as a circuit 5, the division ratio of frequency dividers 3 and 4

in the proposed phase meter, it should be ne less than 3, and both outputs of the dividers are often 1 3 and 4.

The proposed phase meter allows measurement of the phase shift, being measured during the measurement process (in particular, in the case when one of the sigals is clogged with noise).

Subject invention

A phase meter containing reference and measuring channels consisting of a series-connected frequency driver and frequency divider, the outputs of which are connected to the inputs of the phase-sensitive circuit, two serially switched on electronic keys, one of which is connected to the outputs of the phase-sensing circuit and the time of the master circuit, and the second one It is connected with a pulse generator and meter counter, characterized in that, in order to improve the accuracy of phase measurement near zero, simplify the circuit and increase the reliability of the phase meter, it is equipped with two coincident circuits and, two additional forms | Worlds and a trigger, with the output

the first matching circuit connected by one input to the output of the reference channel driver, and the second to the output of the master circuit is connected to the input of the first additional driver, the output of the last ov is connected to the input | M of the “On trigger” installation input to the output of the second coincidence circuit, the pulse input of which is connected to the output of the former of the measuring channel, and the potential control input via the integrating circuit to the output of the “1 flip-flop” installation, one of the outputs of which through the second addition Tel'nykh generator connected to the set input "On frequency divider

measuring channel.