SU828169A2 - Method of measuring single pulse duration - Google Patents

Description

From the first front of the circulating pulse with a quantizing pulse, the circulation is stopped and the duration of the initial pulse is determined by dividing the extended interval by the number of pulses forming this interval.

In the drawing, a device for implementing the method is shown.

The device contains a circulation unit}, elements 2-7, a controllable delay line 8, a control unit 9, a pulse generator 10, an element OR /./, a rewriter unit 12, a block of the falling edge 13, a counter 14, a reset unit 15.

The device works as follows. zom.

The measured pulse goes through the circulation unit 1, the coincidence element 2 to the input of the controlled delay line 8, which is made on the elements with charge coupling, to one of the inputs of the matching elements 5, as well as to the input of the control unit 9 and to the input of the unit Circulation 1. At the other input of the soviaden element 3, clock emulsions arrive from the pulse generator 10, which, through the OR element 11, give permission to write to the controllable delay line 8 of the input pulse. The control unit 9 isolates the leading edge of the input pulse | AND produces a pulse that is longer or equal to the delay time of the controlled delay line 8. This pulse is fed to one input of the coincidence element 4 and allows the clock pulse to pass from the pulse generator 10 through the OR element L1 to the control input of the controlled delay line 8. During the action of a pulse produced by the control unit 9, recorded in the controlled delay line 8, the input pulse passes through the controlled backward line rzhki 8 on its way out. From the output of the controlled delay line 8, a pulse is fed to the input of the rewriting unit 12, the first input of the coincidence element 6 and to the input of the block 13 for the falling edge. The rewrite unit 12 provides a delay of the output pulse for the time it passes through the controllable delay line 8 and records the number of rewrite cycles. After the measured pulse passes through the controllable delay line 8 and rewriting unit 12, it is rewritten again into the controllable delay line 8 by means of enabling clock frequency pulses passing from the pulse generator 10 through the coincidence element 5 and the OR element // on the control The input of the controlled delay line 8. The pulse from the output of the controlled delay line 8 is fed to one input of the coincidence element 6 and gives permission for the passage of quantizing pulses from the pulse geerator 10 pa counter 14. The pulse from block selection

the trailing edge 13 arrives at one input of the coincidence element 7, and the other input of which receives pulses from the pulse generator 10. If the trailing edge of the measured pulse does not coincide with the quantizing pulse produced by the pulse generator 10, then the reset unit 15 gives an enabling pulse to the coincidence element 2 to continue circulating the inlet

measured pulse. Another pulse generated by the reset unit 15 resets the readings of the counter 14.

After rewriting the pulse to the controlled delay line 8 and processing it in

element 6, block 13, counter 14, element 7, block 15, the second measured pulse arrives at the input of the controlled delay line 8. The irihod time is provided by its delay in circulation block 1. The second

the impulse is entered into the control delay line 8 in the same way as the first impulse was. Simultaneously with the insertion into the controlled delay line 8 of the second measured pulse,

shifting the first rewritten pulse by the value of the input pulse, which is ensured by the arrival of 8 clock pulses from the generator 10 to the controlled input of the delay line during the input

momentum. Thus, a pulse, the duration of which is 3 times longer than the duration of the initial measured pulse, is brought into the gain line. Selection of the falling edge of the second pulse with the help of the control unit 9. provides for the passage through the LI1VYU controlled delay of 8 received two pulses, rewriting them into the controlled delay line 8 and processing with the help of element 6, block 13, counter 14, element 7 and block 15 The operation of recording the input circulating imiuls into the controllable delay line unit и and rewriting the impulse contained in it, which is refined during each rewriting cycle by the value of the measured impulse, continues until the element in coincidence of 7 ne, the falling edge of the expanded pulse coincides with a quantizing pulse from the pulse generator 10. With such a coincidence, the reset unit 15 does not generate a pulse to reset the readings of the meter 14 and does not give a permission pulse to the coincidence element 2, which stops the circulation of the input pulse .

The duration of the original pulse is defined as

/ g 4

lzm jv

n - the number of quantizing pulses, recorded by the counter 14;

Gizm - the duration of the measured pulse; K - the period of the following square impulses;

N is the number of pulses forming the interval.

Thus, using the proposed method of measuring the duration of a single pulse will increase the measurement accuracy, since the expansion of the measured pulse until the falling edge of the extended pulse coincides with the quantizing pulse eliminates the uncertainty in their relative position and, therefore, excludes the possible error caused by the asynchronous arrival pulses of the quantizing sequence and the falling edge of the extended interval.

Claims (1)

1. USSR author's certificate number 556412, cl. G 04 F 10/04, 1975.