SU771862A1 - Calibrator of duration of statistically-distributed pulses - Google Patents

Description

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The invention relates to a pulse technique and nuclear electronics. The calibrator can be used primarily in radioisotope instruments to control materials and products.

Pulse-calibration devices are known that consist of a duration calibrator and an amplitude calibrator. These devices first form a pulse of standard duration, then stabilize its amplitude 1. The amplitude stabilization at the level can be achieved using compensated keys. 15 Forming a stable duration at (1-5) .10 represents a certain difficulty. This procedure is carried out mainly on the basis of single-oscillators, artificial-20 delay lines, or high-frequency cables are used for this purpose.

However, the instability of time interval formers based on 25 single-shotrs is about 1-5%, the instability of formers based on delay lines is estimated at (1-5) .10 and determined by their bandwidth, 30

High-frequency cables are limited by their technical capabilities. In addition, the common ways of forming are conservative in rebuilding the duration of the generated signals, and also have a rather large error due to miscalculations of the statistical input signals. It is also known a device for calibrating the duration of statistically distributed pulses .2, which are closest in their technical essence to the invention. Oyo consists of two triggers with separate inputs and a line of es1 support (LZ). The duration of the calibrated pulses is equal to the period of the clock pulses (TI) minus the delay time LZ. When used as a quartz frequency TI, the calibration accuracy is mainly determined by the Stas or the efficiency of the LZ delay.

The disadvantage of this device is the error due to the instability of the delay LZ. In addition, the statistical XjapaKTep time distribution of the input signals leads to the fact that signals that are less than less than the calibration interval can be input to the calibrator input. In this situation, all subsequent calibrated pulses coming from the moment the first pulse arrives at the input of the calibrator until the delayed TI arrives at the first trigger, as well as all the pulses above one entering the device during the calibration interval will be lost (calculated).

The aim of the invention is to improve the calibration accuracy and reduce the number of gaps of calibrated pulses. ,

The goal is achieved by introducing four elemental AND, element OR and three triggers into the device containing two triggers, the single input of the first trigger connected to the first inputs of the second and fourth elements AND whose outputs are connected to the single inputs of the second and third triggers , and the second inputs - with single outputs of the first and second triggers, respectively, the zero output of the first trigger is connected to the first input of the OR element, the zero output of the second trigger - to the first input of the first element And and the second input of the element and OR, zero output of the third trigger - with the first input of the third element And and the third input of the element OR, the output of which is connected to the single input of the fourth trigger, zero input of the fourth trigger is connected to the zero output of the fifth trigger, whose single output is connected to the zero input of the third trigger and the second inputs of the first and third elements And, the outputs of which are connected to zero inputs of the first and second triggers, respectively.

The block diagram of the proposed calibrator is shown in the drawing. Its structure includes triggers 1–4 with separate inputs of elements AND 5–8, element OR 9, and trigger 10 with a counting input 10. The input of the calibrator is the single input of trigger 1 and the inputs of elements AND 6.8. The counting input of trigger 10 is the clock input of the calibrator. The output of the calibrator is the unit output of trigger 4.

The calibrator works as follows.

In the initial position, the flip-flops 1-4 are in the zero state; there is no signal at the single output of the flip-flop 4. Elements And 5.7 open potentials from the zero outputs of the flip-flops 2.3. The incoming inputs to the zero inputs of the flip-flops 1,2,3 clock signals TI do not change their state. The signal TI arriving at the zero input of the trigger 4 also does not change its state.

When the pulse to be calibrated arrives at the input (K), trigger 1 is transferred to one state. The incoming pulse TI returns trigger 1 to its initial state, as a result of which trigger 4 is set to one, and a signal appears at the output of the calibrator. When a pulse arrives, the TI trigger 4 is reset and the formation of a duration calibrated impulse ends. Obviously, in the proposed device, the duration of each generated pulse is equal to the period of the following clock pulses (TI), and the calibration instability is determined only by the instability of the pulse following TI.

If during the time when the next static pulse arrives at the device input, trigger 1 will not be returned to its original state, the second pulse is written to the second trigger, the third to the third trigger, and only the fourth and next pulses will be erased. These recorded pulses are calibrated in the same way as the one input pulse described above, with the difference that triggers 1,2,3, starting with trigger 3, are returned to the initial state for each TI pulse, and at the output of the device duration calibrated pulses. Similarly, the fixation and testing of pulses arriving at the rfk input of the gate during ripoited calibration of a previously received pulse is carried out.

Thus, the proposed device allows to improve the calibration accuracy by eliminating instability introduced by the delay line; reduce the omissions (miscalculations) of the statistical signals arriving at the calibrator input during its dead time due to the short-term memorization of their number (up to and including impulses) and further refinement.

Claims (2)

1.Piontes Yu.E., Taksar I.M., Tesnavs ER, Yanushkovsky V.Ya. Radioisotope means of control and automation of technological processes in industry. Sb.staty Ltomizdat, 1972, p.114 (Proceedings of NT conference of XX years of production and use of isotopes and sources of nuclear radiation in the USSR Union of Chemistry, Minsk, 1968). 2. USSR author's certificate number 204365, cl. H 03 K 5/156, 1967.