SU1324008A1 - Device for measuring time intervals - Google Patents

Abstract

The invention relates to information and measurement technology and can be used in radar, laser technology, automation, and experimental physics for measuring time intervals with high accuracy. The device contains the main generator 1 pulses, vernier generator 2 pulses, additional vernier generator 3 pulses, block 4 reset, element 5 matches, elements AND 6,10,14 and 15, triggers 7 and 13, delay line 12, one-shot 16, element OR 17, the main counter 18 pulses, the main 20 and the additional vernial pulse counters, the computing unit 21. The use of the counters 19 and 20 allows independent counting of the pulses of the generators of the reference, vernial main and additional pulse sequences. This provides an extension of the measurement range of time intervals. 2 Il. (ABOUT

Description

The invention relates to the information-measuring technique and can be used in radar, laser technology, automation, experimental physics for measuring time intervals with high accuracy

Figure 1 shows the functional diagram of the device; 2, time diagrams of his work.

A device for measuring time intervals contains a main generator of 1 pulses, a vernier generator of 2 pulses, an additional vernier generator of 3 pulses, block 4

reset, element 5 coincidence, element 6, trigger 7, delay line 8, coincidence element 9, element 10, trigger 11, delay line 12, trigger 13, elements 14 and 15, one-shot 16, element OR 17, the main counter 18 pulses, the Vernier counter 19 pulses, an additional cone counter 20 pulses and the computing unit 21,

The input of the generator 1 is connected to the start-pulse bus and the third input of the trigger 13, the input of the generator 2 is connected to the stop pulse bus and through the delay line 8 is connected to the second input of the trigger 7, the output of which is connected to the first input of the I 6I element whose second input connects generator 2, and the output with the second input of the coincidence element 5 and the input of the counter 19, the output of the counter 20 is connected to the third input of the computing unit 21, the second input of which is connected to the output of the counter 19, and the first input is connected to the output of the counter 18, the output of the element 5 matches connected to the first input of the reset unit 4, the first inputs of the flip-flops 13 and 7, the start input of the generator 3 and through the delay line 12 to the first input of the trigger 11, the output of which is connected to the first input of the And 10 element, the second input of which is connected to the output of the generator 3j and the output - with the C-input of the counter 20 and the first input of the coincidence element 9, the output of which is connected to the second input of the trigger 11 and the second input of the reset unit 4, the first output of which is connected to the stop input of the generator 2, and the second output - to the stop inputs of the generator 1 and 3. In Ora trigger input

 13 is connected to the start-pulse bus, and its first Bbrxojj, - to the first input

0

five

0

element 14, the second output to the first input of element 15, the output of which is connected to the input of the one-shot 16, the output of which is connected to the second input of the coincidence element 9 and the first input of the element OR 17, the output of which is connected to the C input of the counter 18, and the second input is with the output of element AND 14. The output of generator 1 is connected to the second inputs of elements AND 14 and 15 and the first input of element 5, coincidence.

In the initial state, all the generators are inhibited.

A start-pulse standardized in amplitude and duration (Fig. 2a), fixing the beginning of the measured interval T (Fig. 26) J starts the generator 1, which forms a sequence of reference pulses with a period Tgj, (Fig. 2c) entering the coincidence element 5 , and sets the trigger 13 (FIG. 2d) 9 a signal from the first output of which permits the passage of pulses through the AND 14 element (FIG. 2d) to the OR element 17 and further to the counter 18,

For a standardized amplitude and duration of the stop-pulse (Fig 2a), fix it; its end is measured in-. my time interval t (Fig.26) - the generator 2 is started, which forms the vernier sequence by it (Fig.2e), T "

In the initial state, the signal at the output of the trigger 7 (Fig. 2h) is absent, as a result of which the element 6 does not let the vernial sequence of pulses to the input of the element 5 coincidence. The stop pulse delayed by the delay line 7 at time T, the trigger 7

a sequence of pulses through the element 6 begins to be fed to the input of the element 5 coincidence and to the counter 19,

five

0

five

0

pulses with a period of "

And nol

for example T, 0.9 T.

 J Switch- (fkg.2z), and nonius

At the moment of coincidence of the pulses of the reference and noni. Sequences. Element 5 is the same, it produces a signal (fig. 2g), according to which the reset unit 4 stops forming the vernier sequence (fig. 2e), the troggers 7 and 13 return to the initial state ( figs, and). The same. the signal starts the generator 3 (fig. 2m) J forming an additional vernier sequence

impulses from periods Td 1, for example Td „0.99 Tgj,, and Since trigger 13 switches to the opposite state, the signal from the first output of trigger 13 is absent (FIG. 2d), and the signal from the second output of trigger 13 (FIG. 2i ) allows the passage of the pulses of the generator 1 through the element And 15 (Fig, 2k) to the input of the one-shot

sixteen.

In the initial state, the signal at the output of the flip-flop 11 is absent (Fig. 2n), as a result of which the element 10 does not allow an additional nonius sequence of pulses to the input of the element 9 coincidence. The signal produced by the coincidence element 5 (fig. 2g) and delayed by the delay line 12 switches the trigger 11 (fig.2n) at a time, and an additional vernum sequence of pulses through the element 10 (fig.2o) begins to be fed to the input of the coincidence element 9 and at counter 20.

At the moment of coincidence of the pulses of the reference sequence, formed by a single vibrator 16, of a duration equal to the duration of the pulses of the generator 3 (FIG, 2L), and an additional vernier sequence, the element 9 of the coincidence generates a signal, according to which the reset unit 4 stops forming the reference and additional vernier sequences, and trigger 11 returns to its original state.

The contents of the counters 18 through 20 are transformed as a result of the measurement according to expression (1) in the computing unit 21.

Let the period of the reference sequence TD be set beginning with the N-ro pulse (Figure 2b), i.e. periods 1,2,3, ..., (N-1) are not equal to Trp, the total duration of these (N-1) periods is equal to X.

The period of the vernier sequence is established starting with the K-th pulse (Fig. 2e), i.e. periods 1,2, 3, ..., (TO are not equal to T., the total capacity of these (K-1) periods is Y.

Period of additional vernier sequence. is established starting from the P-th pulse (Fig. 2m), i.e. periods 1,2,3, ..., (P-1) are not equal to Tdn, the total duration of these (P-1) periods is equal to Z. Delay parameters for T and T. lines. 8 and 12 delays are chosen as follows: T, YJ, T MaKcfzJ. In this case, the duration of the reference and vernier sequences is greater than X and Y, and the length of the additional vernier sequence exceeds Z.. .

Let the meter read 18-Cdc

counter 19 - N, counter 20 - N. and days

until registered impulses coincidence. Then

t T N - t f op

NH -

(ABOUT

where D () - () - (Z-T.P).

The use of counters 19 and 20 of the pulsed vernier and additional vernier sequences allows independent counting of the pulses of the generator of the reference verbose and additional vernier sequences, in contrast to device 2, which provides for the pulse counting of only the generator of the reference sequence. Due to this, the range of time interval measurement is extended.

Let, - T „- temporary in

The interval that the device distinguishes when using a vernier sequence. In this case, for reliable operation of the device, it is necessary that the pulse duration of the generators of the reference and vernier sequences be S,

 In order to increase the accuracy of measurement due to the incomplete coincidence of the pulses of the reference and vernier generators (Fig. 2), a time interval is necessary, 2 which the device, i.e. the pulses of generator 1 formed by the single-vibrator 16 and generator 3 must be equal to tfj.

Claims (1)

Invention Formula A device for measuring time intervals containing the main pulse generator, whose input is connected to the start-pulse bus, and the output is connected to the first input of the first match element, the second input of which is connected to the output of the first element And, and the output to the first input of the reset unit and the first input of the first trigger, whose output is under 5 to the first input of the mentor, the second input is connected to the output of the vernier pulses, the stop input is connected to the first output sa, and the start input - from the pulses directly the first delay line house the first trigger, pulse point, the output is connected to the first input unit, it is different In order to increase the accuracy of measurement and expand the range of measured time intervals, an additional non-linear pulse generator and a non-linear and additional vernier pulse counters, a single vibrator J, an OR element, three AND elements, an element of coincidence delay line and two triggers, and an additional trigger input are introduced into it. the vernier generator is connected to the output of the first one, the coincidence element j of the unit, the second delay line to the first input of the second trigger, and directly to the first input of the third secondary trigger A swarm whose input is connected to the start-pulse bus. The second trigger output is connected to the first input of the 5- five 0 And, the second input of which is connected to the output of an additional nonius pulse generator, and the output is connected to the C input of an additional nonius pulse counter and to the first input of the second match element, the second input of which is connected to the output of the one-vibrator and the first input of the IPI element whose second input connected to the output of the third element I5 and output to the C input of the main pulse counter; the output of the second coincidence element is connected to the second input of the second trigger and the second input of the reset unit second input to expensively connected to the stop inputs of the main pulse generator and the additional nonius pulse generator; the first and second outputs of the third trigger are connected to the first inputs of the third and fourth And elements, respectively, the second inputs of which are combined and connected to the output of the main pulse generator, and the fourth of the And elements are connected to the one-shot input, and the outputs of the no- nous and additional vernier pulse counters are connected to the second and third inputs of the computing unit, respectively. oUi ,, CMf “and. 5j L:: t; dj Compiled by L. Pletneva Editor A. Ogar Tehred L. Serdyukova Order 2964/51 Circulation 370Subscription VNII1Sh State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Proofreader L. Patay