CN109959962B - Nuclear signal generator based on pulse type neutron detector signal characteristics - Google Patents
Nuclear signal generator based on pulse type neutron detector signal characteristics Download PDFInfo
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- G—PHYSICS
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
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Abstract
The invention belongs to the field of nuclear measurement of reactors, and particularly relates to a nuclear signal generator based on signal characteristics of a pulse neutron detector, which comprises a setting and displaying module, a random pulse sequence generating module and a shaping output moduleOutput module capable of outputting 1cps to 10 6 And (3) a nuclear pulse signal with a counting rate varying according to any exponential cycle in the cps range. The invention aims to design a signal source which has weak and random pulse amplitude, random pulse generation time and exponentially-changed counting rate on the basis of the signal characteristics of a pulse neutron detector, and research and improvement of the counting characteristics and periodic measurement response conditions of the pulse nuclear measuring instrument on the random signals of the detector in a laboratory are realized.
Description
Technical Field
The invention belongs to the field of nuclear measurement of reactors, and particularly relates to a nuclear signal generator based on signal characteristics of a pulse neutron detector.
Background
The output signal of the pulse neutron detector is a weak current pulse which rises rapidly and falls slowly, the pulse type neutron detector comprises an electronic current pulse and an ion current pulse, the amplitude is in microampere magnitude, Gaussian fluctuation exists, and the pulse time interval approximately follows exponential distribution. The pulse type nuclear measuring instrument mainly reflects the state of a reactor by monitoring the counting rate and the change rate of the counting rate of output signals of a pulse type neutron detector at the stage of low neutron fluence rate.
The conventional signal generator generally generates periodic signals of waveforms such as square waves, sine waves or triangular waves, and the like, and is mainly used for calibrating parameters of a measured instrument, such as amplification factors, pass bands, noise, a measurement range and the like. For a pulse nuclear measuring instrument, at present, there is no suitable signal source simulating the signal characteristics of a nuclear detector, which is used for researching the counting characteristics of the instrument on random signals and the response condition of periodic measurement in a laboratory, the applicability of the instrument is generally preliminarily judged according to circuit parameters measured in the laboratory and accumulated on-pile test experience, and finally verification and modification are required through actual on-pile tests.
Disclosure of Invention
The invention aims to provide a nuclear signal generator based on the signal characteristics of a pulse neutron detector, which is not enough in the prior art, is designed with a signal source with weak and random pulse amplitude, random pulse generation time and exponentially-changed counting rate, and can realize the research and improvement of the counting characteristics and periodic measurement response conditions of the pulse nuclear measuring instrument on the random signals of the detector in a laboratory.
The technical scheme of the invention is as follows:
a nuclear signal generator based on pulse type neutron detector signal characteristics comprises a setting and displaying module, a random pulse sequence generating module and a shaping output module; the signal is conducted in two directions between the setting and displaying module and the random pulse sequence generating module;
the random pulse sequence generation module comprises an output counting rate control module, a random number generator, a signal amplitude controller, a nanosecond advanced precision timer and a narrow pulse generator, wherein signals in the output counting rate control module are transmitted to the random number generator in a one-way mode, the signals in the random number generator are transmitted to the signal amplitude controller and the nanosecond advanced precision timer respectively in a one-way mode, the signal amplitude controller and the nanosecond advanced precision timer respectively transmit signals to the narrow pulse generator in a one-way mode, and the narrow pulse generator respectively transmits the signals to the electronic pulse forming and attenuating module and the ion pulse forming and attenuating module in a one-way mode;
the shaping output module comprises an electronic pulse shaping and attenuating module, a merging output module, an ion pulse shaping and attenuating module and two voltage-current conversion modules, wherein the electronic pulse shaping and attenuating module transmits signals to one voltage-current conversion module in a single direction, the ion pulse shaping and attenuating module transmits the signals to the other voltage-current conversion module in a single direction, and the two groups of signals are converged and then enter the merging output module in a single direction.
The nuclear signal generator based on the pulse neutron detector signal characteristics has the following parameters:
counting rate output range: 1cps to 10 6 cps；
Periodic output range: 2 s-999 s, -999 s-2 s;
output current pulse signal amplitude: 0 to-10 muA;
output current pulse time characteristics: the rise time is about 10ns and the fall time is about 400 ns;
output current pulse interval time timing accuracy: 1 ns;
output impedance: 50 Ω or 75 Ω.
The output range covers at least 6 orders of magnitude and the varying signal may vary continuously within this range.
The change rule of the signals is programmed control, and the signals output by the signal source can be changed according to a preset rule.
The signal is based on the signal characteristics of the pulse neutron detector and accords with the time and amplitude statistical characteristics of the nuclear signal.
The invention has the beneficial effects that:
the invention provides a new nuclear signal generator, which utilizes a high-speed FPGA technology to generate a signal source with weak and random pulse amplitude, random pulse generation time and exponentially-changed counting rate, outputs signals according with the signal characteristics of a pulse neutron detector, and can realize the conditions of 1cps to 10 cps 6 And (3) a nuclear pulse signal with a counting rate varying according to any exponential cycle in the cps range. The signal generator can be used for researching and debugging a pulse type neutron detector secondary instrument.
Drawings
FIG. 1 is a schematic diagram of a nuclear signal generator based on pulse-type neutron detector signal characteristics;
Detailed Description
The invention will be further described with reference to the following figures and examples:
a nuclear signal generator based on pulse type neutron detector signal characteristics comprises a setting and displaying module, a random pulse sequence generating module and a shaping output module; the signal is conducted in two directions between the setting and displaying module and the random pulse sequence generating module;
the random pulse sequence generation module comprises an output counting rate control module, a random number generator, a signal amplitude controller, a nanosecond advanced precision timer and a narrow pulse generator, wherein signals in the output counting rate control module are unidirectionally transmitted to the random number generator, the signals in the random number generator are unidirectionally transmitted to the signal amplitude controller and the nanosecond advanced precision timer respectively, the signal amplitude controller and the nanosecond advanced precision timer transmit signals to the narrow pulse generator respectively, and the narrow pulse generator transmits the signals to the electronic pulse forming and attenuating module and the ion pulse forming and attenuating module respectively and unidirectionally;
the shaping output module comprises an electronic pulse shaping and attenuating module, a merging output module, an ion pulse shaping and attenuating module and two voltage-current conversion modules, wherein the electronic pulse shaping and attenuating module transmits signals to one voltage-current conversion module in a single direction;
the nuclear signal generator based on the pulse neutron detector signal characteristics has the following parameters:
counting rate output range: 1cps to 10 6 cps；
Periodic output range: 2 s-999 s, -999 s-2 s;
output current pulse signal amplitude: 0 to-10 muA;
output current pulse time characteristics: the rise time is about 10ns and the fall time is about 400 ns;
output current pulse interval time timing accuracy: 1 ns;
output impedance: 50 Ω or 75 Ω.
The output range covers at least 6 orders of magnitude and the varying signal may vary continuously within this range.
The change rule of the signal is programmed control, and the signal output by the signal source can be changed according to a preset rule.
The signal is based on the signal characteristics of the pulse-type neutron detector and accords with the time and amplitude statistical characteristics of the nuclear signal.
Equipment composition and function
The principle of a nuclear signal generator based on the signal characteristics of a pulse neutron detector is shown in figure 1, and the signal generator consists of a setting and displaying module, a random sequence generating module and a shaping output module.
The setting and displaying module is used for man-machine interaction, reading the initial counting rate and the index period set by a user, controlling the output of the signal source and displaying the counting rate output condition in real time in an output state.
The random pulse sequence generation module adopts a high-speed FPGA technology, calculates the required output counting rate in real time in the output state of a signal source, then generates random numbers in the corresponding counting rate state through a random number generator, controls the signal amplitude according to the random numbers on one hand, performs nanosecond high-precision timing according to the random numbers on the other hand, and outputs nanosecond narrow pulses with controllable amplitude by using a narrow pulse generator after timing is completed, so that a narrow pulse sequence with random amplitude and time is generated.
The shaping output module is used for enabling signals generated by the random pulse sequence generation module to pass through the electronic pulse shaping and attenuation circuit and the ion pulse shaping and attenuation circuit respectively, and then pass through the two voltage-current conversion circuits and the combined output circuit, so that finally output signals conform to the signal characteristics of the pulse neutron detector.
Claims (5)
1. A nuclear signal generator based on pulse type neutron detector signal characteristics is characterized in that: the device comprises a setting and displaying module, a random pulse sequence generating module and a shaping output module;
the random pulse sequence generation module comprises an output counting rate control module, a random number generator, a signal amplitude controller, a nanosecond advanced precision timer and a narrow pulse generator, wherein signals in the output counting rate control module are unidirectionally transmitted to the random number generator, the signals in the random number generator are unidirectionally transmitted to the signal amplitude controller and the nanosecond advanced precision timer respectively, the signal amplitude controller and the nanosecond advanced precision timer transmit signals to the narrow pulse generator respectively, and the narrow pulse generator transmits the signals to the electronic pulse forming and attenuating module and the ion pulse forming and attenuating module respectively and unidirectionally;
the shaping output module comprises an electronic pulse shaping and attenuating module, a merging output module, an ion pulse shaping and attenuating module and two voltage-current conversion modules, wherein the electronic pulse shaping and attenuating module transmits signals to one voltage-current conversion module in a single direction, the ion pulse shaping and attenuating module transmits the signals to the other voltage-current conversion module in a single direction, and the two groups of signals are converged and then enter the merging output module in a single direction.
2. A nuclear signal generator based on pulsed neutron detector signal characteristics, as claimed in claim 1, wherein:
the nuclear signal generator based on the pulse type neutron detector signal characteristics has the following parameters:
counting rate output range: 1cps to 10 6 cps；
Periodic output range: 2 s-999 s, -999 s-2 s;
output current pulse signal amplitude: 0 to-10 muA;
output current pulse time characteristics: the rise time is 10ns, and the fall time is 400 ns;
output current pulse interval timing precision: 1 ns;
output impedance: 50 Ω or 75 Ω.
3. A nuclear signal generator based on pulsed neutron detector signal characteristics, as claimed in claim 1, wherein: the output range covers at least 6 orders of magnitude and the varying signal may vary continuously within this range.
4. A nuclear signal generator based on pulsed neutron detector signal characteristics, as claimed in claim 1, wherein: the change rule of the signal is programmed control, and the signal output by the signal source can be changed according to a preset rule.
5. A nuclear signal generator based on pulsed neutron detector signal characteristics, as claimed in claim 1, wherein: the signal is based on the signal characteristics of the pulse-type neutron detector and accords with the time and amplitude statistical characteristics of the nuclear signal.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10142340A (en) * | 1996-11-08 | 1998-05-29 | Tsuyusaki Tomoko | Random number generator and encryption unit |
| WO2012163239A1 (en) * | 2011-06-02 | 2012-12-06 | 中国科学技术大学 | Method and system for digitalizing nuclear radiation pulse amplitude |
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| DE1238586B (en) * | 1961-10-25 | 1967-04-13 | Inst Plasmaphysik Ges Mit Besc | Method for operating a neutron generator and device for practicing this method |
| SU307539A1 (en) * | 1969-08-11 | 1990-03-07 | Andreev A N | Neutron pulse generator |
| US4731572A (en) * | 1982-12-17 | 1988-03-15 | The United States Of America As Represented By The Department Of Energy | Precision electronic speed controller for an alternating-current |
| JP4064009B2 (en) * | 1999-07-30 | 2008-03-19 | 株式会社東芝 | Line type discrimination type radiation detector |
| EP1883281B1 (en) * | 2006-07-28 | 2012-09-05 | Sage Innovations, Inc. | A method for generating a pulsed flux of energetic particles, and a particle source operating accordingly |
| ATE528639T1 (en) * | 2006-07-28 | 2011-10-15 | Sage Innovations Inc | DETECTION SYSTEM AND DETECTION METHOD BASED ON PULSED ENERGETIC PARTICLES |
| DK2106678T3 (en) * | 2006-12-28 | 2010-09-20 | Fond Per Adroterapia Oncologic | Ion Acceleration System for Medical and / or Other Uses |
| RU72555U1 (en) * | 2007-11-19 | 2008-04-20 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт автоматики им. Н.Л. Духова" | DIAGRAM OF A PULSED NEUTRON GENERATOR |
| JP2010085415A (en) * | 2009-12-28 | 2010-04-15 | Japan Atomic Energy Agency | Two-dimensional radiation and neutron image detector |
| CN102455430A (en) * | 2010-10-27 | 2012-05-16 | 成都理工大学 | Digital forming method of nuclear pulse signal |
| CN103580654B (en) * | 2013-10-18 | 2016-08-17 | 中国核动力研究设计院 | Reactor period signal generator and its implementation and using method |
| CN106405616B (en) * | 2016-09-06 | 2019-05-21 | 中国核动力研究设计院 | A kind of pulse measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10142340A (en) * | 1996-11-08 | 1998-05-29 | Tsuyusaki Tomoko | Random number generator and encryption unit |
| WO2012163239A1 (en) * | 2011-06-02 | 2012-12-06 | 中国科学技术大学 | Method and system for digitalizing nuclear radiation pulse amplitude |
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