RU2004928C1 - Device to counter events - Google Patents

Abstract

The invention relates to computer technology and can be used in apparatus for measuring the pulse repetition rate. The device comprises a sensor, a limiter, a differentiating element, a pulse shaper, a key, resistors, a capacitor and an output unit. The device allows the pulse repetition rate to be measured by converting the time intervals between pulses to a proportional voltage, the change of which is monitored by the output unit 2 or.

Description

The invention relates to computer and information technology and can be used in measuring the repetition rate of periodic signals, as well as in dosimeters for measuring background radiation.

A device for counting piece goods is known which provides high accuracy of counting due to discrimination of a signal in it not only in amplitude but also in duration.

The disadvantage of the device is limited functionality,

Closest to the proposed device is a device for counting composting, which consists of a sensor, a differentiating element, limiters, a pulse shaper implemented on the RS-trigger, D-trigger and contact sensor, and also a counter, which is output device

The known device provides reliable estimates, but is limited in its functionality.

The aim of the invention is to enhance the functionality.

In FIG. functional

device diagram; in Fig 2 - timing diagrams of his work.

The device comprises a sensor 1, a limiter 2, a differentiating element 3, a pulse shaper 4, made of the first logic gate 5, DMSDL 6, resistor 7, condensation mount 8 and the second logic valve 9, key 1Q, resistor 11, resistor 12, a storage capacitor 13, an output unit 14, made of analog-to-digital Converter 15 and a digital indicator 16.

A Geiger-Muller counter can be used as a sensor, and the output unit 14 can be made on the basis of a conventional switch device for measuring voltage.

In the device, the output of the sensor 1 is connected to the input of the limiter 2. The output of the limiter 2 is connected to the input of the differentiating element 3, the output of which is connected to the input of the first logic gate 5. which is the input and the driver of pulses 4. The output of the first logical gate 5 is connected to the anode 6 The cathode of the diode 6 is connected to the input of the resistor 7, to the first plate of the capacitor 8 and to the input of the second logic gate 9. The output of the resistor 7 and the second plate of the capacitor 8 are connected to the power bus -. The output of the second logic gate 9, which is also the output of the pulse former 4, is connected to the first input of the key 10, the second input of which is connected to the power bus, and the output to the inputs of the resistor 11 and resistor 12. The output of the resistor 11 is connected to the power bus -, and the output of the resistor 12 to the first plate of the second capacitor 13 and to the input of the analog-to-digital converter 15, which is the input of the output device 14. The outputs of the analog-to-digital converter 15 are connected to the corresponding inputs of the digital indicator 16.

The device operates as follows. When the events occurring in time in the form of gamma radiation are perceived, the sensor 1 generates electric pulses of arbitrary duration and amplitude (Fig. 2a), which are output from the sensor to the input of the limiter 2, the Limiter 2 equalizes all the incoming pulses in amplitude and forms a slope their fronts. The sequence of pulses aligned in amplitude (Fig. 2, b) from the output of the limiter 2 p buys to the input of the differentiating element 3. The differentiating element 3 forms from each passing pulse two short opposite polarity (Fig. 2, c), which come from the output of the differentiating element to the input of the pulse former 4, and hence to the input of the logic gate 5, while only the positive polarity pulses are transmitted to the output of the gate 5, and converted to a rectangular shape (Fig. 2d). The pulses (Fig.2d) from the output of the first logical gate 5 pass through diode b and charge the capacitor 8. In the period between pulses, the capacitor 8 is discharged through the resistor 7 to the power bus -, thereby supporting the input of the second logical gate 9 a certain level of voltage, which causes the formation of a pulse at its output, the duration of which is uniquely determined by the discharge time of the capacitor 8. Thus, from the output of the second logic gate 9, which is also the output of the pulse former 4, in series The number of pulses (Fig. 2, e), the duration of which does not depend either on the amplitude or on the duration of the initial pulses (Fig. 2, a), is supplied to the first input of the switch 10, the second input of which is supplied with voltage from the power bus + . For the duration of the pulse duration, the key 10 is opened and charges the capacitor 13 from the power bus + through the Ria resistor 12. The capacitor is charged according to the known procedure

cone: is E (1 - e gC), where r Ria; t

time, C is capacity; Uc is the voltage across the capacitor; E is the voltage of the power source. At the end of the pulse, the key 10 is locked and disconnects the capacitor 13 from the power bus +, which begins to discharge through the resistors 12 and 11 to the power bus - until the next pulse arrives at the first input of the key 10 according to the law: t

Uc U0e rC.

where r is Ri2 + Rii, t is time, C is the capacitance, Uc is the voltage at the capacitor, U0 is the voltage at the capacitor at the time of locking key 10.

The charge and discharge modes of the capacitor 13 are carried out on a linear portion of its characteristic, which, as a rule, is selected depending on the required measurement accuracy in a given range. In connection with this, the discharge time constant

Claims (1)

SUMMARY OF THE INVENTION A DEVICE FOR CALCULATING EVENTS, comprising a sensor, a differentiating element, a voltage limiter, a pulse shaper, an output unit, characterized in that a key and series-connected first and second resistors and a storage capacitor are combined, a combined output of the first and second resistors through the key connected to the positive power bus, and the combined output of the second resistor and the storage capacitor is connected to the output unit, and the pulse shaper is made on two lo ble Tr of the capacitor 13 is set by selecting the resistances of the resistors 11 and 12, respectively, and the capacitance of the capacitor 13 and determines the coefficient corresponding number of pulses per unit time with voltage across the capacitor. The voltage of the capacitor 13 is supplied to the input of the output unit 14, which is also the input of the anslo-digital converter 15. The analog-to-digital converter 15 converts the voltage of the capacitor (Fig. 2, f) into digital codes, which are transmitted from its outputs to the corresponding inputs of the digital indicator 16. which on its scoreboard displays the received information. (56) Copyright certificate of the USSR No. 1603413. cl. G 06 M 7/00, 1990. USSR Copyright Certificate Ne 1418779.cl. G 06 M 3/00. 1989. gates, a diode and a chain of parallel connected resistor and capacitor, one output of the chain is connected to the zero potential bus, and the other to the cathode of the diode and to the input of the second logic gate, the output of which is the output of the pulse former, and the input of the pulse former the input of the first logic gate is connected, the output of which is connected to the anode of the diode, the output of the sensor through series-connected voltage limiter, a differentiating element and a pulse shaper is connected to the control input of the switch. and s % / X.Z 6 B H W.3 W.6 fc i 1 % x.4 U W FIG. 2