CN109959962A - Nuclear signal generator based on impulse type neutron detector characteristics of signals - Google Patents
Nuclear signal generator based on impulse type neutron detector characteristics of signals Download PDFInfo
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- CN109959962A CN109959962A CN201711337088.6A CN201711337088A CN109959962A CN 109959962 A CN109959962 A CN 109959962A CN 201711337088 A CN201711337088 A CN 201711337088A CN 109959962 A CN109959962 A CN 109959962A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
Abstract
The invention belongs to react core fields of measurement, and in particular to a kind of nuclear signal generator based on impulse type neutron detector characteristics of signals includes seing and displaying module, random pulse sequence generation module and shaping output module, can export 1cps to 106Counting rate presses the core pulse signal of arbitrary characteristics mechanical periodicity within the scope of cps.The purpose of the present invention is based on impulse type neutron detector characteristics of signals, the signal source for having that impulse amplitude is faint at random, pulse generation time is random and counting rate exponentially changes is designed, realizes research and improvement of the impulse type nuclear measurement instrument to the counting properties and period measurement response condition of detector random signal in laboratory.
Description
Technical field
The invention belongs to react core fields of measurement, and in particular to a kind of based on impulse type neutron detector characteristics of signals
Nuclear signal generator.
Background technique
Impulse type neutron detector output signal is to rise the relatively slow weak current pulse of rapid, decline, includes electronics electricity
Pulse and ionic current pulses two parts are flowed, amplitude in microampere magnitude, and there are Gauss fluctuation, obey by pulse interval approximation
Exponential distribution.Impulse type nuclear measurement instrument mainly passes through monitoring impulse type neutron detector output letter in the low neutron fluence rate stage
Number counting rate and counting rate change rate reflect the state of reactor.
Traditional signal generator generally generates the periodic signal of the waveforms such as square wave, sine wave or triangular wave, is mainly used for
Demarcate the parameters such as tested meter parameter, such as amplification factor, passband, noise, measurement range.For impulse type nuclear survey meter
Table is used in laboratory research instrument at present there is no the signal source of suitable imitative nuclear detector characteristics of signals to random signal
Counting properties and period measurement response condition, test on the heap of the circuit parameter and accumulation that are measured generally according to laboratory
Experience, tentatively judges instrument applicability, finally needs to verify and modify by testing on true reactor.
Summary of the invention
The object of the present invention is to which the prior art is insufficient, a kind of core based on impulse type neutron detector characteristics of signals is provided
Signal generator, designing has faint random, the pulse generation time of impulse amplitude random and counting rate exponentially changes
Signal source can realize that impulse type nuclear measurement instrument responds the counting properties and period measurement of detector random signal in laboratory
The research and improvement of situation.
The technical scheme is that
A kind of nuclear signal generator based on impulse type neutron detector characteristics of signals, including set and display module, with
Machine pulse train generation module and shaping output module；It is provided between display module and random pulse sequence generation module
Signal Bidirectional Conduction；
The random pulse sequence generation module includes output counting rate control module, randomizer, signal amplitude
Controller, nanosecond high-class timer and narrow-pulse generator, wherein signal one-way transmission in output counting rate control module
To randomizer, signal is unidirectionally transmitted separately to signal amplitude controller in randomizer and nanosecond high-class is fixed
When device, signal amplitude controller and nanosecond high-class timer distinguish one-way transmission signal to narrow-pulse generator, burst pulse
Signal is distinguished one-way transmission electron pulse-shaping and attenuation module and ion pulse molding and attenuation module by generator；
The shaping output module includes electronic impulse molding and attenuation module, merges output module, ion pulse molding
And attenuation module and two Voltage-current conversion modules, wherein signal is one-way transmitted to by electronic impulse molding and attenuation module
Signal is one-way transmitted to another voltage-to-current and turned by one Voltage-current conversion module, ion pulse molding and attenuation module
Block is changed the mold, two groups of signals unidirectionally enter jointly after converging and merge output module.
The nuclear signal generator parameters based on impulse type neutron detector characteristics of signals are as follows:
Counting rate output area: 1cps~106cps；
Period output area: 2s~999s, -999s~-2s；
Export current pulse signal amplitude: 0~-10 μ A；
Export current impulse time response: the rise time is about 10ns, and fall time is about 400ns；
Export current impulse interval time timing accuracy: 1ns；
Output impedance: 50 Ω or 75 Ω.
Output area at least covers 6 orders of magnitude, and the signal changed can continuously change within this range.
The changing rule of signal is signal intensity program-controlled, that signal source can be allowed to export according to preconfigured rule.
Signal is time and the amplitude statistics characteristic for meeting nuclear signal based on impulse type neutron detector characteristics of signals.
The beneficial effects of the present invention are:
The invention proposes a kind of new nuclear signal generator, which generates pulse using high speed FPGA technology
The signal source that amplitude is faint at random, pulse generation time is random and counting rate exponentially changes, output signal coincidence pulse
Type neutron detector signal characteristic is, it can be achieved that 1cps to 106Counting rate presses the core pulse of arbitrary characteristics mechanical periodicity within the scope of cps
Signal.The signal generator can be used for the research and debugging of impulse type neutron detector secondary meter.
Detailed description of the invention
Fig. 1 is the nuclear signal generator schematic diagram based on impulse type neutron detector characteristics of signals；
Specific embodiment
The present invention is further introduced with embodiment with reference to the accompanying drawing:
A kind of nuclear signal generator based on impulse type neutron detector characteristics of signals, including set and display module, with
Machine pulse train generation module and shaping output module；It is provided between display module and random pulse sequence generation module
Signal Bidirectional Conduction；
The random pulse sequence generation module includes output counting rate control module, randomizer, signal amplitude
Controller, nanosecond high-class timer and narrow-pulse generator, wherein signal one-way transmission in output counting rate control module
To randomizer, signal is unidirectionally transmitted separately to signal amplitude controller in randomizer and nanosecond high-class is fixed
When device, signal amplitude controller and nanosecond high-class timer distinguish one-way transmission signal to narrow-pulse generator, burst pulse
Signal is distinguished one-way transmission electron pulse-shaping and attenuation module and ion pulse molding and attenuation module by generator；
The shaping output module includes electronic impulse molding and attenuation module, merges output module, ion pulse molding
And attenuation module and two Voltage-current conversion modules, wherein signal is one-way transmitted to by electronic impulse molding and attenuation module
Signal is one-way transmitted to another voltage-to-current and turned by one Voltage-current conversion module, ion pulse molding and attenuation module
Block is changed the mold, two groups of signals unidirectionally enter jointly after converging and merge output module；
The nuclear signal generator parameters based on impulse type neutron detector characteristics of signals are as follows:
Counting rate output area: 1cps~106cps；
Period output area: 2s~999s, -999s~-2s；
Export current pulse signal amplitude: 0~-10 μ A；
Export current impulse time response: the rise time is about 10ns, and fall time is about 400ns；
Export current impulse interval time timing accuracy: 1ns；
Output impedance: 50 Ω or 75 Ω.
Output area at least covers 6 orders of magnitude, and the signal changed can continuously change within this range.
The changing rule of signal is signal intensity program-controlled, that signal source can be allowed to export according to preconfigured rule.
Signal is time and the amplitude statistics characteristic for meeting nuclear signal based on impulse type neutron detector characteristics of signals.
Equipment composition and function
Nuclear signal generator principle based on impulse type neutron detector characteristics of signals is as shown in Figure 1, the signal generator
By seing and displaying module, module and shaping output module three parts composition occur for random sequence.
The effect for seing and displaying module is human-computer interaction, for reading initial count rate set by user and index week
Phase controls the output of signal source, and real-time display exports counting rate situation under output state.
Random pulse sequence generation module uses high speed FPGA technology, under signal source output state, needed for calculating in real time
Counting rate is exported, the random number of corresponding counts rate state is then generated by randomizer, on the one hand according to random numerical control
On the one hand signal amplitude processed carries out the high precision timing of nanosecond according to random number, utilizes burst pulse after the completion of timing
Device exports the nanosecond burst pulse of an amplitude-controllable, to generate an amplitude and time random narrow pulse sequence.
The effect of shaping output module is that the signal for generating random pulse sequence generation module passes through electronic impulse respectively
Forming and the forming of attenuator circuit and ion pulse and attenuator circuit, then pass through two current/charge-voltage convertors and one
Merge output circuit, makes the signal coincidence pulse type neutron detector signal characteristic of final output.
Claims (5)
1. a kind of nuclear signal generator based on impulse type neutron detector characteristics of signals, it is characterised in that: including being arranged and showing
Show module, random pulse sequence generation module and shaping output module；
The random pulse sequence generation module includes output counting rate control module, randomizer, signal amplitude control
Device, nanosecond high-class timer and narrow-pulse generator, wherein output counting rate control module in signal be one-way transmitted to
Machine number generator, signal is unidirectionally transmitted separately to signal amplitude controller and nanosecond high-class timing in randomizer
Device, signal amplitude controller and nanosecond high-class timer distinguish one-way transmission signal to narrow-pulse generator, burst pulse hair
Signal is distinguished one-way transmission electron pulse-shaping and attenuation module and ion pulse molding and attenuation module by raw device；
The shaping output module includes electronic impulse molding and attenuation module, merges output module, ion pulse molding and decline
Subtract module and two Voltage-current conversion modules, wherein signal is one-way transmitted to one by electronic impulse molding and attenuation module
Signal is one-way transmitted to another Voltage-current conversion mould by Voltage-current conversion module, ion pulse molding and attenuation module
Block, two groups of signals are common unidirectional into merging output module after converging.
2. a kind of nuclear signal generator based on impulse type neutron detector characteristics of signals as described in claim 1, feature
It is:
The nuclear signal generator parameters based on impulse type neutron detector characteristics of signals are as follows:
Counting rate output area: 1cps~106cps；
Period output area: 2s~999s, -999s~-2s；
Export current pulse signal amplitude: 0~-10 μ A；
Export current impulse time response: the rise time is about 10ns, and fall time is about 400ns；
Export current impulse interval time timing accuracy: 1ns；
Output impedance: 50 Ω or 75 Ω.
3. a kind of nuclear signal generator based on impulse type neutron detector characteristics of signals as described in claim 1, feature
Be: output area at least covers 6 orders of magnitude, and the signal changed can continuously change within this range.
4. a kind of nuclear signal generator based on impulse type neutron detector characteristics of signals as described in claim 1, feature
Be: the changing rule of signal is signal intensity program-controlled, that signal source can be allowed to export according to preconfigured rule.
5. a kind of nuclear signal generator based on impulse type neutron detector characteristics of signals as described in claim 1, feature
Be: signal is time and the amplitude statistics characteristic for meeting nuclear signal based on impulse type neutron detector characteristics of signals.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917387A (en) * | 2020-08-13 | 2020-11-10 | 中国核动力研究设计院 | High-speed acquisition system of neutron detector signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917387A (en) * | 2020-08-13 | 2020-11-10 | 中国核动力研究设计院 | High-speed acquisition system of neutron detector signal |
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