SU1308978A1 - Method of measuring single time intervals - Google Patents

Abstract

The invention relates to the field of measurement technology. The goal is to increase the accuracy of measurements of single time intervals. The essence of the measurement method lies in the fact that when the pulses (I) circulate at the beginning and end of the measured interval at the instant of the coincidence of the AND beginning of the measured interval with the AND quantizing sequence, the counting of quantizing sequence periods and circulation periods begins. To achieve the goal at the moments of two subsequent matches, the AND quantizing sequence at the end of the measured interval, respectively, fix the number of N and M circulation periods and the number of L and K periods of the quantizing sequence and determine the measured time interval T by the formula T, (ML - NK ), / (M- N) .t, where the period of the quantizing sequence. . 2 Il. F (L with about 00: about 00

Description

The invention relates to a measurement technique, in particular, to the extraction of time intervals, and can be used in radio engineering, experimental physics.

The purpose of the invention is to improve the measurement accuracy.

FIG. 1 shows the functional schemes; devices that clarify the measurement process of the proposed: method i in FIG. 2 - time diagrams.

The device contains a circulator 1 consisting of an OR element 2 and a delay line 3, a distributor of 4 pulses containing AND 5 and 6 elements and a 1K flip-flop 7, And 8-10 elements, a generator of 11 quantizing sequence pulses, And 12-15 elements , counters 16-19, triggers 20-22.

The essence of the method of the invention is that, when the pulses of the beginning and end of the measured interval circulate at the instant of coincidence of the pulse of the beginning of the measured interval with the pulse of the quantizing sequence, the counting of the quantizing sequence and the periods of circulation begin, and at the time of two subsequent coincidences of the quantizing sequence pulses with the pulses of the end of the measured interval, respectively, the number of N and M circulation periods and the number of L and K periods are recorded spine and determined measured e- my time interval T, by the formula

13

MF N

(1) 40

where tj, is the period of quantizing pulses

The device works as follows.

The beginning and end of the measured time interval are applied to the input of the circulator 1, which with a certain delay comes from the output of the circulator 1 to the input of the pulse distributor 4, implemented on the 1K-trigger 7 and the elements 5 and 6, each odd pulse coming with Shch1rkul torus 1, passes through the element And 5, and each even - through the element And 6,

The impulse of the beginning (I) and the end (II) of the measured interval is subjected to circulation by the proposed method.

-

308978 T

W

f5

20

25

thirty

jf, (FIG. 2). Circulation period TC T, f-I- Tu (Tu is the duration of the circulation period). Impulse I appears at the output of element And 5, and impulse II - element And 6.

At time t, if a pulse 1 in the AND 8 element coincides with one of the quantizing sequence pulses, the Q-output of the trigger 20 is set to one, the elements 9, 10, 14 and 15 are opened, the counters 16 and 17 start counting the numbers N and M circulation periods up to the instants of time t and t-, counters 18 and 19 — counting the pulses of the quantizing sequence L and K.

At the instant tj, the pulse II with the pulse of the quantizing sequence through the element 12 and 12 is set to one by the Q-output of the RS flip-flop 21, the elements 9 and 14 are closed, the numbers N and L are fixed in the counters 16 and 18

At time tj, if the subsequent pulse II coincides with the pulse of the quantizing sequence, similarly, counters 17 and 19 record the number of periods M and K. The device returns to its initial state by resetting through the R inputs of triggers 7-22, counters 16-19.

Using the following dependencies between time intervals at time t and t

1) T, 1) Tx

+ NTy Lt -t- MT from Kt

get

t - ML

TX - nd - N The T value of the measured single time interval does not depend on the magnitude of the circulation period, the relative measurement error rfT is determined by the relative error of the quantizing sequence period t / ti.

Formulas

the invention

55

A method of measuring single time intervals based on the circulation of pulses at the beginning of the end of the measured time interval and in counting the number of circulation periods and

3130

periods of the quantizing sequence from the moment of coincidence of the pulse of the quantizing sequence with one of the circulating pulses of the beginning of the measured time interval until the first moment of coincidence of the pulse of the quantizing sequence with one of the circulating pulses of the end of the measured time interval, characterized in that, in order to improve the measurement accuracy, The number of circulation periods and periods of the quantizing sequence is also recorded at the second moment of coincidence of the quantizing pulse. lnosti with one end of the circulating pulses in the measured time interval and determining the measured time interval by the formula

 F

 m

 TO

de T - the value of the measured time interval

N, M is the number of circulation periods for two consecutive time intervals up to the first and up to the second coincidence of the pulses of the quantizing sequence with the pulses of the end of the measured interval, respectively

L, K - the number of periods of the quantizing sequence for the same time intervals j

tts- period quantizing sequence.

1

/ 7

Y / 7

I ... JLLL

int

FIG g

Claims (2)

Claim A method for measuring single time intervals55, based on the circulation of pulses of the beginning and end of the measured time interval and in counting the number of circulation periods and 3 1308978 periods of a quantizing sequence from the moment of coincidence of the pulse of the quantizing sequence with one of the circulating pulses of the beginning of the measured time interval to the first moment of the coincidence of the pulse of the quantizing sequence with one of the circulating pulses of the end of the measured time interval, characterized in that, with 10 aim of increasing the accuracy measurements, also record the number of circulation periods and periods of the quantizing sequence at the second moment of coincidence of the pulse of the quantizing sequence - 15 successive to one end of the circulating measured temporal pulse interval and the measured time interval is determined by the formula T - v ^to M - N ^k 'where Τ _χ - value of the measured time interval; Ν, M - the number of circulation periods for two consecutive time intervals until the first and second coincidence of the pulses of the quantizing sequence with the pulses of the end of the measured interval, respectively; L, K - the number of periods of the quantizing sequence for the same time intervals; t _k is the period of the quantizing sequence. FIG. 1 FIG. 2