KR100928777B1 - Pulse Signal Processing Apparatus and Method for Well-Type Thermoneutron Simultaneous Counters - Google Patents

Abstract

Disclosed are a pulse signal processing apparatus and method for a well type thermoneutron counter. The pulse signal processing device of the well-type thermal neutron co-counter is a helium 3 (He-3) gas detector for measuring an neutron emitted from a nuclear material and outputting an input signal, and converting the input signal into a two-channel pulse signal for transmission. A TTL line driver module includes a pulse overlap processor for generating a compensation pulse signal when the transmitted pulse signals overlap and compensate for overlap, and a co-counter for counting pulse signals of the pulse overlap processor. In addition, the pulse signal processing method of the well-type thermal neutron co-counter provides a pulse signal processing apparatus of the well-type thermal neutron co-counter, by measuring the neutrons emitted from the nuclear material in the helium 3 (He-3) gas detector Outputting an input signal, converting the input signal into a pulse signal in a TTL line driver module and transmitting the pulse signal, and generating a compensation pulse signal in a pulse overlap processor when the pulse signal transmitted from the TTL line driver module is overlapped Compensating for redundancy, providing a serialized pulse signal to a co-counter through the TTL line driver module and a pulse overlap processor, and counting the pulse signal at the co-counter. Therefore, the operation state of the helium 3 co-counter can be confirmed in real time, and the overlapping of pulse signals can be counted in the co-counter without loss, thereby improving measurement efficiency.

Helium 3, Counter, Pulse Signal, TTL Line Driver

Description

Pulse Signal Processing Apparatus and Method for Well-Type Thermal Neutron Synchronizers {PULSE SIGNAL PROCESSING DEVICE AND METHOD FOR WELL-TYPED THERMAL NEUTRON COINCIDENCE COUNTER}

The present invention relates to a pulse signal processing apparatus and method for a well-type thermal neutron co-counter, and more particularly, to measure and manage the nuclear material by non-destructive thermal neutrons generated from the nuclear material, the operation status of the gas detector The present invention relates to a pulse signal processing apparatus and method for a well type thermoneutron co-counter that monitors the signal in real time and accurately counts the output signal in the form of a pulse without being lost in the process.

In general, radioactivity refers to a phenomenon in which a nucleus decays, releasing a part of the nucleus' components as radiation. And a substance containing an atomic nucleus that can spontaneously collapse is called a radioactive substance. This phenomenon has been constantly studied since its discovery in 1896 by the French physicist Becquerel. On the other hand, all of these changes in the nucleus are called radioactive ray, which is commonly referred to as alpha, beta, and γ rays. In addition, neutron radiation emitted mainly from nuclear reactors is one of the important radiations in modern times.

The measurement of radioactivity basically uses radiation interacting with matter. There are Geiger tubes using the ionization of the gas when the radiation passes through the gas, fog box, scintillation counter to observe the fluorescence emitted by the collision of the radiation material, atomic nucleus plate using the photosensitive plate.

Here, the pulse signal processing apparatus of the conventional well type thermal neutron coincidencer will be described in more detail as follows. 1 is a circuit diagram illustrating a pulse signal processing apparatus of a conventional well type thermal neutron coincidencer.

As shown in the drawing, the pulse signal processing apparatus of the well type thermal neutron co-counter includes a plurality of helium 3 (He-3) gas detector 10, a signal processor 20, and a co-counter 30.

The helium 3 gas detector 10 is configured to output an input signal 11 by measuring neutrons emitted from a nuclear material, and the signal processor 20 serially outputs the input signal 11 in a pulse signal 31. OR signal processor circuit to convert The co-counter 30 is provided to count the serialized pulse signal 31.

In addition, the helium 3 gas detector 10 is connected to the amplifier 15 is provided to amplify the input signal, the amplifier 15 is an LED (16) indicating the operating status of the helium 3 gas detector 10 ) Is attached.

However, the pulse signal processing apparatus of the conventional well type thermal neutron counter has some problems.

First, a pulse overlap occurs when the signal processor converts the input signal into the serialized pulse signal, and the pulse processor is input to the co-counter without considering the signal lost due to the overlap between the pulses. There is a problem of low efficiency.

Secondly, the operation of the helium 3 gas detector is difficult to identify the correct operation of the helium 3 gas detector by simply checking the blinking state of the LED.

One object of the present invention for solving the above problems is that the pulse signal processing apparatus of the well type thermoneutron co-counter that can improve the measurement efficiency by counting in the co-counter without loss of signal even when the pulse overlap occurs And providing a method.

Another object of the present invention is to provide a pulse signal processing apparatus and method for a well type thermoneutron co-counter capable of monitoring the operating state of the helium 3 gas detector in real time.

According to a preferred embodiment of the present invention for achieving the above object of the present invention, the pulse signal processing apparatus of the well-type thermal neutron co-counter measures the neutron emitted from the nuclear material and outputs an input signal of helium 3 (He- 3) a gas detector, a TTL line driver module for converting the input signal into a two-channel pulse signal and transmitting the pulse signal; a pulse overlap processor for compensating for overlap by generating a compensation pulse signal when the transmitted pulse signal overlaps; It includes a co-counter for counting the pulse signal of the processor.

Here, the pulse overlap processor may include a duplicate detection unit detecting whether the input pulse signal overlaps, a signal output unit outputting a duplicate signal when the overlap occurs, and a pulse output outputting the compensation pulse signal according to the duplicate signal. It is preferable to include a part.

The pulse output unit may further generate the compensation pulse signal by delaying a predetermined predetermined time relative to the pulse signal.

The pulse signal processing apparatus of the well type thermal neutron counter may further include a counter module for counting the pulse signal, and the counter module may more preferably count the pulse signal at a clock frequency of 80 MHz.

In addition, the pulse signal processing apparatus of the well-type thermal neutron co-counter further comprises a monitoring unit, the monitoring unit is preferably presented the operating status of the gas detector. In addition, the gas detector is more preferably provided in plurality.

In addition, according to another preferred embodiment of the present invention for achieving the above object, the pulse signal processing method of the well-type thermal neutron co-counter provides a pulse signal processing apparatus of the well-type thermal neutron co-counter, helium 3 ( He-3) measuring an neutron emitted from a nuclear material in a gas detector and outputting an input signal, converting and transmitting the input signal into a two-channel pulse signal in a TTL line driver module, and transmitting the TTL line driver module Generating a compensation pulse signal in the pulse overlap processor when the pulse signal is overlapped to compensate for the overlap; providing a serialized pulse signal to the co-counter through the TTL line driver module and the pulse overlap processor; Counting the pulse signal in a counter.

The compensating of the redundancy may include detecting whether the pulse signal transmitted from the TTL line driver module is overlapped, outputting a duplicate signal when the overlap occurs, and performing the compensation pulse signal according to the overlapped signal. It is preferable to include the step of outputting.

The outputting of the compensation pulse signal may further include delaying a predetermined predetermined time.

The pulse signal processing method of the well type thermal neutron counter may include counting the pulse signal transmitted from the TTL line driver module at a clock frequency of 80 MHz, monitoring the operation of the helium 3 gas detector, and monitoring the pulse signal. More preferably, the step of presenting the operating status of the helium 3 gas detector.

According to the present invention, when a pulse signal overlap occurs, a new pulse signal is generated by delaying a predetermined time, thereby counting in a co-counter without signal loss, thereby improving measurement efficiency.

In addition, a counting module and a monitoring unit may be provided to monitor the helium 3 gas detector to monitor the operating state of the helium 3 gas detector in real time.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. For reference, in the following description, elements that can be treated identically in terms of configuration and function are almost the same and can be specified by the same reference numerals.

My Example 1

Referring to the pulse signal processing apparatus of the well-type thermal neutron simultaneous counter according to the first embodiment of the present invention. FIG. 2 is a circuit diagram illustrating a pulse signal processing apparatus of a well type thermal neutron coincidencer according to a first embodiment of the present invention.

As shown therein, the pulse signal processing apparatus of the well type thermal neutron co-counter includes a helium 3 gas detector 100, a TTL line driver module 200, a pulse overlap processor 300, and a co-counter 400. .

The helium-3 gas detector 100 is generally provided as a commercially available neutron detector, and uses a ³ He gas of water pressure, and is provided to output an input signal by measuring neutrons emitted from the nuclear material. Here, Scheme 1 showing the nuclear reaction of the ³ He atom nucleus and the incident neutron is as follows.

³ ₁ He + ¹ ₀ n → ¹ ₁ H (573 keV) + ³ ₁ H (191 keV)

At this time, the generated high-energy hydrogen and tritium nuclei ionize the surrounding gases, and the ions are attracted to the anode (or cathode) under high voltage, and a pulse current flows. That is, the helium 3 gas detector 100 outputs the pulse type current as an input signal.

In addition, the helium 3 gas detector 100 is provided in plurality in order to improve the measurement efficiency of the neutron emitted from the nuclear material.

The TTL line driver module 200 is provided to convert the input signal output from the helium 3 gas detector 100 into a pulse signal and transmit the pulse signal, and is a commercially available TTL line driver (Transistor and transistor line driver) device. It is provided.

In addition, the TTL line driver module 200 includes a 50 ohm line driver 210 and a Schmitt trigger device 220. To illustrate this in more detail, FIG. 3 is presented. 3 is a circuit diagram illustrating in detail a TTL line driver module included in a pulse signal processing apparatus of a well type thermal neutron coincidencer according to a first embodiment of the present invention.

As shown in the drawing, the TTL line driver module 200 includes two 50 ohm line drivers 210 and a Schmitt trigger device 220, respectively. The input signals 11 output from the three helium 3 gas detectors 100 are respectively converted into two pulse signals 21.

Here, the pulse signal 21 processing apparatus of the well type thermal neutron coincidencer further includes a counter module 500. In addition, the TTL line driver module 200 is provided to convert the input signal 11 into two pulse signals 21 to be transmitted to the pulse redundancy processor 300 and the counter module 500.

The counter module 500 is provided to count the pulse signal 21 at a clock frequency of 80 MHz since the pulse signal 21 output from the TTL line driver module 200 is output at a short frequency of 50 ns.

In addition, the pulse signal processing apparatus of the well-type thermal neutron counter further includes a monitoring unit (not shown), the operation of the helium 3 gas detector 100 in accordance with the pulse signal counted in the counter module 500 To present the situation. The monitoring unit is generally provided with a PC with a built-in commercially available monitoring program.

That is, compared to the LED for presenting a simple flashing signal provided in the pulse signal processing apparatus of the conventional well type thermal neutron counter, there is an effect of real-time checking of the detailed operation of the helium 3 gas detector.

The pulse overlap processor 300 is provided to generate a compensation pulse signal when the pulse signal transmitted from the TTL line driver module 200 overlaps to compensate for the overlap.

Here, FIG. 4 is provided to describe the pulse overlap processor 300 in more detail. 4 is a circuit diagram illustrating in detail the circuit of the pulse overlap processor 300 included in the pulse signal processing apparatus of the well type thermal neutron coincidencer according to the first embodiment of the present invention. For reference, it will be described with reference to FIGS. 2 and 4 for the convenience of description.

As shown therein, the pulse overlap processor 300 includes a duplicate detector 310, a signal output unit 320, and a pulse delay output unit 330.

The overlap detector 310 is provided to detect whether the pulse signal 21 transmitted from the TTL line driver module 200 is overlapped, and the signal output unit 320 is configured to detect the pulse signal 21. When duplication occurs, it is provided to output a duplicate signal.

In addition, the pulse delay output unit 330 is provided to delay output the serialized pulse signal 31 by compensating the compensation pulse signal according to the overlapping signal.

Here, for example, the operation of the pulse overlap processor 300 will be described.

First, as shown in FIG. 2, the pulse overlap processor 300 is provided to have four input terminals and one output terminal, and the input signals output from the 24 helium 3 gas detectors 100 correspond to the TTL line. In order to be transmitted to the pulse redundancy processor 300 through the driver module 200 and inputted as a serialized pulse signal to the co-counter 400, three pulse redundancy processors 300, that is, the nine pulse overlaps The processor 300 is provided.

Here, the number of cases where four pulse signals overlapped with the pulse overlap processor 300 are duplicated is as follows.

Here, the number of overlapping cases of the pulse signals 21 of four A, B, C, and D input to the pulse overlap processor 300 is 11 of 16 shown in Table 1.

In this case, considering only the case of two pulse overlaps that are likely to overlap, the total number of six cases of the 3rd, 5th, 6th, 9th, 10th, and 12th shaded shades.

In this case, the pulse overlap processor 300 generates a new pulse signal by sufficiently delaying the pulse signal input later among the overlapping signals among the pulse signals 21.

This will be described according to the components of the pulse overlap processor 300. First, the overlap detection unit 310 receives the pulse signal to detect whether there is a duplication. To this end, the overlap detection unit 310 is provided with an AND gate of 7408 commonly used.

In this case, when the pulse signal is 3, 5, 6, 7, 9, 10, 11, 12, 13, 14, or 15th, respectively, the signal output unit 320 overlaps the signal according to the signal of the overlap detection unit. Output the signal. For reference, in the present embodiment, the case of the highest probability of overlap will be described for convenience of description. In addition, the signal output unit 320 is provided with 74123 devices commonly used for the above operation, and generates a pulse signal of 50ns according to the pulse signal.

Next, the pulse output unit 330 generates a new pulse signal by delaying 120 ns to compensate for the duplicated pulse signal according to the duplicated signal. When the duplicated signal is not output, the pulse output unit 330 is serialized. 31).

For reference, the pulse output unit 330 is connected to the inverter element 331 of the 7-channel input and the NAND element 332 of the 7-channel input and 1-channel output.

My 2 Example

Referring to the pulse signal processing method of the well-type thermal neutron coincidencer according to the second embodiment of the present invention. FIG. 5 is a flowchart illustrating a pulse signal processing method of a well type thermal neutron counter according to a second embodiment of the present invention in order. For reference, it will be described with reference to the components and reference numerals presented in the first embodiment of the present invention for convenience of description.

As shown in the figure, first, a step (P1) of providing a pulse signal processing apparatus of a well-type thermal neutron co-counter. Here, the pulse signal processing apparatus of the well type thermal neutron co-counter includes a helium 3 gas detector 100, a TTL line driver module 200, a pulse overlap processor 300, and a co-counter 400.

Next, the helium 3 gas detector 100 measures the neutrons emitted from the nuclear material and outputs an input signal (P2).

Next, the TTL line driver module converts the input signal into a two-channel pulse signal and transmits it to the pulse overlap processor 300 (P3).

Next, when the pulse signal transmitted from the TTL line driver module 200 overlaps, the pulse overlap processor generates a compensation pulse signal for compensating the pulse signal and compensates for the overlap (P4).

Here, FIG. 6 is provided to explain the step (P4) of compensating the overlap in more detail. FIG. 6 is a flow chart showing in detail the redundancy compensation step of the pulse signal processing method of the well type thermal neutron coincidencer according to the second embodiment of the present invention.

As shown in FIG. 1, first, the overlap detector 310 detects whether the pulse signal transmitted from the TTL line driver module 200 is overlapped (P41).

Next, when the pulse signal is duplicated, the signal output unit 320 outputs the duplicated signal (P42).

Next, the pulse output unit 330 outputs the compensation pulse signal according to the overlapping signal (P43).

The outputting of the compensation pulse signal (P43) may further include outputting the compensation pulse signal by delaying a predetermined predetermined time. That is, the compensation pulse signal is output without overlapping the overlapping pulse signal to enable accurate counting.

Next, the serialized pulse signal is passed through the TTL line driver module 200 and the pulse overlap processor 300 to the co-counter 400 (P5).

Next, the pulse signal processing method of the well type thermal neutron coincidencer is completed by performing the step P6 of counting the pulse signal in the coincidencer 400.

Here, the step of checking the operation state of the helium 3 gas detector 100 by modifying the pulse signal processing method of the well type thermal neutron coincidencer may be added, and FIG. do. 7 is a flowchart illustrating a modification of a pulse signal processing method of a well type thermal neutron coincidencer according to a second embodiment of the present invention. For reference, descriptions of components similar or identical to those shown in FIGS. 5 to 6 will be omitted.

As shown in the figure, first, the TTL line driver module 200 transforms the input signal into a two-channel pulse signal and transmits the signal to the pulse overlap processor 300 (P3). The module 200 converts one input signal into two pulse signals and transmits the same to the pulse overlap processor 300 and the counter module 500 (P31).

Next, the pulse signal is counted to the counter module 500 at a clock frequency of 80 MHz (P7).

Next, a step of monitoring the operation of the helium 3 gas detector 100 in a monitoring unit is performed (P8).

Next, the step of checking the operating state of the helium 3 gas detector 100 is completed by performing a step (P9) of presenting the operating state of the helium tri-gas detector 100 in the monitoring unit.

Accordingly, there is an effect that can accurately grasp the operating status of the helium 3 gas detector 100 in real time through the monitoring unit (not shown).

However, in the present embodiment, the operation state of the helium 3 gas detector has been suggested to be monitored only once, but the present invention is not limited thereto or limited thereto. After the step P8, the operation returns to the step P31 again. It is more preferable to continuously monitor the helium 3 gas detector 100 while outputting an input signal.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a circuit diagram illustrating a pulse signal processing apparatus of a conventional well type thermal neutron coincidencer.

FIG. 2 is a circuit diagram illustrating a pulse signal processing apparatus of a well type thermal neutron coincidencer according to a first embodiment of the present invention.

3 is a circuit diagram illustrating in detail a TTL line driver module included in a pulse signal processing apparatus of a well type thermal neutron coincidencer according to a first embodiment of the present invention.

FIG. 4 is a circuit diagram showing in detail a circuit of a pulse overlap processor included in a pulse signal processing apparatus of a well type thermal neutron coincidencer according to a first embodiment of the present invention.

FIG. 5 is a flowchart illustrating a pulse signal processing method of a well type thermal neutron counter according to a second embodiment of the present invention in order.

FIG. 6 is a flow chart showing in detail the redundancy compensation step of the pulse signal processing method of the well type thermal neutron coincidencer according to the second embodiment of the present invention.

FIG. 7 is a flowchart illustrating a modification of a pulse signal processing method of a well type thermal neutron coincidencer according to a second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

11: input signal 15: amplifier

16: LED 21: pulse signal

100: Helium 3 gas detector 200: TTL line driver module

210: 50 ohm line driver 220: Schmitt trigger element

300: pulse redundancy processor 310: duplicate detection unit

320: signal output unit 330: pulse output unit

400: Same time handset 500: Counter module

100: housing 150: passage portion

Claims (7)

A helium 3 (He-3) gas detector for measuring an neutron emitted from nuclear material and outputting an input signal; A TTL line driver module for converting the input signal into a two-channel pulse signal and transmitting the converted signal; A pulse overlap processor for generating a compensation pulse signal when the transmitted pulse signals overlap and compensate for the overlap; And A co-counter for counting pulse signals of the pulse overlap processor; Pulse signal processing apparatus of the well-type thermal neutron counter. The method of claim 1, The pulse redundancy processor A duplicate detector detecting whether the input pulse signals overlap; A signal output unit which outputs a duplicate signal when the duplication occurs; And A pulse output unit configured to output the compensation pulse signal according to the overlap signal; Pulse signal processing apparatus of the well-type thermal neutron co-counter comprising a. The method of claim 2, And the pulse output unit generates the compensation pulse signal by delaying a predetermined predetermined time relative to the pulse signal. Providing a pulse signal processing apparatus of a well type thermal neutron counter; Measuring an neutron emitted from the nuclear material in a helium 3 (He-3) gas detector and outputting an input signal; Converting the input signal into a pulse signal in a TTL line driver module and transmitting the pulse signal; Compensating for overlap by generating a compensation pulse signal in a pulse overlap processor when the pulse signal transmitted from the TTL line driver module overlaps; Providing a serialized pulse signal to a co-counter via the TTL line driver module and a pulse overlap processor; And Counting the pulse signal in the co-counter; Pulse signal processing method of the well-type thermal neutron counter. The method of claim 4, wherein Compensating the duplication Detecting whether the pulse signal transmitted from the TTL line driver module is overlapped; Outputting a duplicate signal when the overlap occurs; And Outputting the compensation pulse signal according to the overlap signal; Pulse signal processing method of the well-type thermal neutron co-counter comprising a. The method of claim 5, The outputting of the compensation pulse signal may further include generating the compensation pulse signal by delaying the predetermined predetermined time relative to the pulse signal. The method of claim 4, wherein After the TTL line driver module converts the input signal into a pulse signal and transmits the pulse signal, Counting the pulse signal transmitted from the TTL line driver module at a clock frequency of 80 MHz; Monitoring the operation of the helium 3 gas detector; And Presenting operating conditions of the helium 3 gas detector being monitored; Pulse signal processing method of the well-type thermal neutron counter, characterized in that it further comprises.

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