SU547703A1 - Digital pulse frequency difference meter - Google Patents

Description

one

The invention relates to measurement technology and can be used when registering pulses of ionizing radiation detectors.

A well-known pulse frequency meter containing a reference frequency generator, a reversible counter, a frequency divider, keys, an OR element, a matching element, does not allow to compensate for the sensitivity spread of detectors, which reduces its accuracy 1.

The closest technical solution to the invention is a digital pulse frequency difference meter comprising a reference frequency generator, the output of which is connected via a frequency divider to the first inputs of keys and through a match to the first input of the reversal counter, the outputs of which are connected to the second inputs of keys, the key outputs are connected via the element OR to the second input of the element 2.

However, this meter also has insufficient measurement accuracy with a variation in the sensitivity of detectors.

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

For a digital pulse frequency difference meter, it contains a reference frequency generator, the output of which is connected via a frequency divider to the first inputs of keys and via a terminal

matches to the first input of the subtraction of the counter account, the outputs of which are connected to the second inputs of the keys, and the outputs of itmuy are connected through the element OR to the second input of the match element, additionally entered two

identical scaling units, the inputs of which are connected to the outputs of the frequency divider, and the outputs of the scaling units are connected to the second subtraction input and the summation input of the reversible counter, each block

mass-containing contains switches, the outputs of which are connected via keys to the inputs of the OR element, and the output of the OR element is connected to the input of the coincidence element, with the second inputs of the keys being the inputs of the massage module,

and the outputs of the elements are coincidental outputs of the scaling units.

The drawing shows a block diagram of the device.

The digital pulse frequency difference meter contains 1 reference frequency generator, share 2 frequencies, s) 3-1-3-4, 4-1-4-4 and 5-1-5-4, zl "MW 6-8, elements, 9-11 matches, switch; w 12 and 13, reversible counter 14 and VKHOY 15 and 16, and the output of the generator 1 is connected to the woo-divider 2, the outputs of which are connected to the first inputs of the keys 3-1-3-4 , 4-1-4-4 and 5-1 -5-4, the second inputs of which are connected respectively to the outputs of the counter 14 and switches 2 and 13, and the outputs to the inputs of elements 6-8, respectively, whose outputs are connected to the first inputs. , respectively, the elements 9-P, the second inputs of which are respectively connected to the input of the generator I and inputs 15 and 16, and the output respectively to the first and second inputs of the subtraction and the summing input of the counter 14. The device works as follows. The digital code recorded at the outputs of splitter 2 is compared in the first scaling block, which includes the keys 4-1-4-4, the element, the switch 12 and the element 10 ,. with the code set on switch 12. If the codes coincide, element 10 is open and control impulses are sent to the input of element 10, the duration and duty cycle of which depends on the code of switch 12. At the same time, pulses from input 15 are sent to the subtraction input of counter 14

f -1 ° s

N where

max

to - reference frequency of the generator I;

N is switch code 12;

NMEKC - maximum switch code 12.

The second unit of the masiggabyroVI works similarly on the keys 5-1-5-4, element 8, switch 13 and element I.

When the code recorded at the outputs of counter 14 coincides with the delnel 2 code, the second subtraction input of counter 14 begins to receive pulses with a frequency following the total frequency of the pulses from inputs 15 and 16. The counter code goes down until The outputs will not establish a code corresponding to the difference in the frequency of the pulses at the inputs 15 and 16, each of which is multiplied by the corresponding coefficient K and Kj given by the switches 12 and 13.

Let the inputs 16 and 15 be supplied with signals from the main and background detectors, with the number

pulses of the main signal Raino sum of the number of pulses of the useful signal. N, and NZ background, the number of pulses from the background detector is N3. Then, at the output of the counter, 14 sets the code

N K M tHj-K, M5 (i -), K, H,

If a

N K, K (j, i.e., an error. The analysis of the number of background pulses from the main and fog detectors, with an appropriate choice of the coefficients K | and Cs, is completely eliminated.

Claims (2)

1.Digital pulse frequency difference meter, containing a reference frequency generator, the output of which is connected via a frequency divider to the key inputs of the keys and through a match element to the first subtraction input of a reversible counter, the output of which is connected to the second inputs of keys, and the outputs of the keys are connected 4pepej element OR to the second (to the input of the element of coincidence, about 1 and 1), and with the fact that, in order to improve the measurement accuracy, two identical scaling units are added to it, the inputs of which are connected to the outputs The frequency module and the inputs of the mass stabilization units are connected to the second subtraction input and the summation input of the reversible counter. 2. The meter according to claim I, characterized in that each mass stabilization unit contains switches whose outputs are connected through keys to the inputs of the OR element, and the output terminal i and OR are connected to the input of the matching element, the second inputs of the keys the inputs of the mass stabilization unit, the outputs of the coincidence elements are the outputs of the mass stabilization units. Sources of information taken into account in the examination: 1.MissRean JHebumeMts OY A ethotJs 34, 1965. p. 106 2. Digital electrical measuring instruments. Ed. V.M.It ishna, M., Energie, 1972, p. 80 (prototype).