SU134075A1 - Device for adjusting gain in automatic control systems with radioactive sources - Google Patents

Description

Known devices are known for adjusting and amplifying in automatic control systems for radioactive sources, containing a control radioactive source, a pulse shaping unit with an integrator, a multichannel amplitude discriminator with a waiting multivibrator for terminating the process: aging, one single multiple controls, t solvoprotiv.cheny and integrator decoded block of it,

The main disadvantage of the known devices is that they i-re allow; 1c.k;; to reveal the influence of the iMei in time of the activity of the signal,: 1 radio.: Tivngh sources.

In it is spelled; This drawback is eliminated by the fact that b, the pulse shaping pulse with the integrator, which receives pulses, excites the control radioactive source, is connected to a multi-channel, full amplitude discriminator, the output voltages of each of the kiaals of which are used to regulate the integrity of the integrator, for example , by changing the value of controlled resistances included in the integrator of the decoding unit.

The passage of a radioactive sensor (not shown: ia che;) more closely) over an effective counting device / (see block diagram), at the output of this device, pulses are transmitted after amplifier 2 to the forming unit 3. From the output of the unit 5 impulses formed in amplitude and duration through circuit 4, which performs the logical operation “NOT, frighten” an integrated circuit, 5, to the output of which through diodes 6-13 an amp, -1tum discriminator, outputted in the form of crzggers 14, is connected 21, per-point triggered thresholds.

134075-2 When one of the 14-2 triggers with a higher triggering threshold is triggered, the diodes 22-29 with the fender device 30 fail to trigger the remaining triggers with lower thresholds.

The signal from the output of the fired trigger is iodized to one of the matching schemes 31-38 that perform the logical operation "I.

The other inputs of the matching circuits 31-38 are supplied with a signal from the flip-flop 39 controlled by the awaiting multivibrator 40 connected to the output of the circuit 4.

The signals generated by the coincidence circuits are fed to the controlled resistances 41-44 and to the input of the circuit 45, which performs the logical operation "OR. From the output of the circuit 45, a surge voltage is applied to the circuit 4, thus stopping the voltage rise at the output of the integrating circuit 5. The compressed resistance 41-44 changes the time constant of the integrating circuit 5 in such ways that at the output of the circuit 5 sets the voltage received for the nominal sensor activity set. Counter 46, after passing the last radioactive source over the recipient-counting device, generates a signal that returns the circuit of the device for adjusting the gain to its initial state.

Subject matter of the invention;

A device for adjusting the gain in automatic control systems with radioactive sources, containing a control radioactive source, a block of forma tions and emulsions with an integrator, a multichannel amplitude discriminator with a waiting multivibrator for discontinuing a deployment process, one or more controllable resistances, and a decoder integrator , excluding it by the fact that, in order to eliminate the influence of changes in the activity of radioactive signal sources, the pulse shaping unit with int The generator, whose input receives impulses excited by an -controlled radioactive source-com-, is connected to a multichannel amplitude discriminator, the output terminals of each channel of which are used to adjust the sensitivity of the integrator, for example, by changing the size of the controlled resistances, included in the integrator of the decoding unit.

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