CN109459786A - A kind of detection system based on source range signal - Google Patents
A kind of detection system based on source range signal Download PDFInfo
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- CN109459786A CN109459786A CN201811521367.2A CN201811521367A CN109459786A CN 109459786 A CN109459786 A CN 109459786A CN 201811521367 A CN201811521367 A CN 201811521367A CN 109459786 A CN109459786 A CN 109459786A
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- signal
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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
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Abstract
The invention belongs to nuclear power station instrument fault detection technique fields, specifically provide a kind of detection system based on source range signal, reached using modular design concept and rationally utilizes resource, high pressure superposition, signal amplification, screening and Shape correction are carried out by the pulse signal to source range, pulse signal is sampled by CPU board, then the signal waveform after sampling is for statistical analysis, by judging whether signal is abnormal to waveform analysis, it is compared simultaneously by calling history case and device to acquire data, judges whether detection signal is abnormal.The system can realize the detection, processing and result output function of source range signal, achieve the purpose that quickly accurate detection system is abnormal.
Description
Technical field
The invention belongs to nuclear power station instrument fault detection technique fields, and in particular to a kind of detection based on source range signal
System.
Background technique
In in-service nuclear power plant's blind controller system operational process, since equipment or element there are failure, defect or are
Parameter setting of uniting is unreasonable, can frequently result in blind controller system abnormal signal, and system is made to be in abnormal condition operation, in order to
Entire process system will not usually be stopped and carry out corresponding event by the stability for guaranteeing the operation of site technique system
Barrier diagnosis and service work.Meanwhile it may trigger unexpected protection act during inline diagnosis or cause technical specification
It is required that equipment is unavailable, extreme influence nuclear safety performance.
It is therefore desirable to have a kind of method can realize fault detection and diagnosis, discovery and judgement letter by offline mode
Number abnormal point, quickly and accurately positioning failure.
Summary of the invention
The purpose of the present invention is overcome the problems, such as that Nuclear Instrument system failure detection is difficult in the prior art.
For this purpose, the present invention provides a kind of detection systems based on source range signal characterized by comprising detector,
High voltage output module, signal condition Shaping Module and counting rate statistical module；
The detector is for the ray in detection source range channel and generates corresponding pulse signal；
The pulse signal is superimposed upon described by the high voltage output module for exporting continuously adjustable high voltage power supply
Detection signal is obtained in continuously adjustable high voltage power supply；
The signal condition Shaping Module to the detection signal for being filtered, amplifying examination screening and waveform shaping
Pulsewidths constant square wave is obtained after processing；
The counting rate statistical module is used to carry out the pulsewidths constant square wave statistics calculating analysis and output signal is examined
Survey result.
Preferably, the detection system further includes current device, and the current device is used to count mould to the counting rate
Block provides directly proportional DC current.
Preferably, the voltage swing of the high voltage power supply is 900V.
Preferably, the detector model CPNB44 applies boron proportional counter tube.
Preferably, the signal condition Shaping Module for the detection signal is filtered, amplify screen screen and
Pulsewidths constant square wave is obtained after waveform shaping processing to specifically include:
By the detection signal by obtaining low voltage pulse signal after high-pass filter, using inverse proportion amplification, voltage
Square wave is obtained after comparator adjustment, obtains the stable square wave of impulse amplitude after then screening afterwards by discriminator, and will be stable
Square wave is the square wave of pulsewidths constant by complex programmable logic device (CPLD) waveform shaping.
Preferably, the counting rate measurement period of the complex programmable logic device (CPLD) is 10ms.
Preferably, the counting rate statistical module is used to carry out the pulsewidths constant square wave statistics to calculate to analyze and export
Signal detecting result specifically includes:
The CPU of complex programmable logic device (CPLD) reads a moment T counting rate statistical value every 10ms and adds up
The counting rate statistical value D at a moment is obtained afterwards.
Preferably, the default maximum time of the counting rate statistical module is 5.12s, maximum count value 3840, when sentencing
When a disconnected moment T is greater than or equal to the 5.12s or counting rate statistical value D at a moment more than or equal to 3840, then updating should
The counting rate statistical value D=D/T at one moment, then by the equal zero setting of counting rate statistical value D at moment T and a moment.
Beneficial effects of the present invention: this detection system based on source range signal provided by the invention, using modularization
Design concept reaches rationally using resource, carries out high pressure superposition, signal amplification, screening and whole by the pulse signal to source range
Shape processing, enables pulse signal to be sampled by CPU board, then that the signal waveform after sampling is for statistical analysis, by wave
Conformal analysis judges whether signal is abnormal, while being compared by calling history case and device to acquire data, judges detection letter
It is number whether abnormal.The system can realize the detection, processing and result output function of source range signal, reach quickly accurate detection
The purpose of system exception.
The present invention is described in further details below with reference to attached drawing.
Detailed description of the invention
Fig. 1 is that the present invention is based on the detection system block schematic illustrations of source range signal；
Fig. 2 is that the present invention is based on the signal condition of the detection system of source range signal and Shaping Module functional block diagrams；
Fig. 3 is that the present invention is based on the calculation flow charts of the counting rate of the detection system of source range signal.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " center ", "upper", "lower", "front", "rear", " left side ",
The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on the figure
Orientation or positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
Term " first ", " second " be used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or
Implicitly indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or imply
Ground includes one or more of the features；In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or
It is more than two.
The embodiment of the invention provides a kind of detection systems based on source range signal, comprising: detector, High voltage output mould
Block, signal condition Shaping Module and counting rate statistical module；
The detector is for the ray in detection source range channel and generates corresponding pulse signal；
The pulse signal is superimposed upon described by the high voltage output module for exporting continuously adjustable high voltage power supply
Detection signal is obtained in continuously adjustable high voltage power supply；
The signal condition Shaping Module to the detection signal for being filtered, amplifying examination screening and waveform shaping
Pulsewidths constant square wave is obtained after processing；
The counting rate statistical module is used to carry out the pulsewidths constant square wave statistics calculating analysis and obtains counter data.
It follows that as shown in Figure 1, the detection system based on source range signal includes detector, high voltage output module, letter
Number conditioning Shaping Module and counting rate statistical module.Ray in detector detection source range channel simultaneously generates corresponding pulse letter
Number and signal condition Shaping Module is transmitted by cable interface, while high voltage output module carries out high laminated to the pulse signal
Add.Although detection system is not high to the power requirement of High voltage output, the voltage for requiring power supply to export is continuously adjustable, and
Due to being the application for proportional counter tube, it is desirable that high voltage power supply has high output accuracy and extremely low output ripple, otherwise
The output ripple of high-voltage power supply itself may be erroneously interpreted as effective pulse signal, and measured by system, to influence
Testing result.The pulse signal is superimposed upon in the continuously adjustable high voltage power supply and obtains detection signal, then passes through letter
Number conditioning Shaping Module be filtered, amplify examination screening and waveform shaping handle after obtain pulsewidths constant square wave.Finally by
Counting rate statistical module detect to the pulsewidths constant square wave and output test result.
In a specific implement scene, the course of work of detection system is as shown in Fig. 2, detect signal by detector
And add high pressure to obtain the high pressure of tape pulse signal, low voltage pulse signal, then inverse ratio are then obtained by the high-pass filtering under high pressure
The signal-to-noise ratio of signal is improved after example amplification, then by the high-precision voltage comparator in discriminator to low voltage pulse signal into
Row relatively amplify after obtain the square wave of pulse width variations, then export to complex programmable logic device (CPLD) carry out waveform shaping be
The square wave of pulsewidths constant, and filter out burr, is finally sent in counting rate statistical module, wherein counting rate statistical module is also
It is realized by complex programmable logic device (CPLD), wherein complex programmable logic device (CPLD) can select the production of Xilinx
Product.The counting rate measurement period of complex programmable logic device (CPLD) is 10ms, and CPU reads complex programmable logic every 10ms
Statistical value in device CPLD, and calculated, real counting rate size is obtained, counting rate, which calculates, uses preset maximum time
With the mode of preset maximum count, maximum time 5.12s, maximum count 3840.The meter for obtaining statistics finally by CPU
Digit rate is read out analysis and handles to obtain testing result, while feeding back to after the counting rate statistical value is converted by high-precision DA
High-precision voltage comparator, so that discriminator preferably improves low voltage pulse signal.
Preferred scheme, the voltage swing of high voltage power supply are 900V.It follows that the quasi- selection of high-voltage power module is existing
The ultralow ripple high voltage precision power module of MDA series.The ultralow ripple high voltage precision power supply of MDA series be mainly used in mass spectrograph,
The application such as photomultiplier tube, proportional counter tube and ionisation chamber.It has following features: a, high stability, and 10ppm/ hours；B, it is ultralow
Ripple, noise, the noise less than 10ppm and the ripple down to 5mV；C, 10ppm/ DEG C of ultralow temperature drift；D exports the electricity of high pressure
Pressure is continuously adjustable；E, 1~5W of output power range.
Wherein, source range Measurement channel (CNS) is made of 2 independent same lines.Start in shutdown and in power station
Initial stage, source range route guarantee neutron fluence rate redundant measurement.Its measurement range is 10-1To 2 × 105n/
cm2.s (the 10 of rated power-9To 10-3%), high voltage power supply is about 900V.
Detector is also sensitivity to gamma-rays, and gamma-rays can be such that its filling gas ionizes.The height given for one
Pressure ionizes generated current impulse amplitude A and changes with the energy variation of ray.From principle, alpha ray generates ionization
The amplitude of current signal is greater than gamma-ray signal amplitude.Generated pulse passes through one " pulse amplifier " in detector
Pulse signal is obtained after handling, which includes: an amplifier, a pulse processing unit and an electric current dress
It sets.One amplifier, its function are so that the detector of electronic circuit is matched, and improve signal noise ratio；One amplifier,
Its function is so that the detector of electronic circuit is matched, and improve signal noise ratio；One current device, it provides and counts
The directly proportional DC current of rate.
Preferred scheme, the voltage swing of high voltage power supply are 900V.
Preferred scheme, detector model CPNB44 apply boron proportional counter tube.
Preferred scheme, the counting rate measurement period of complex programmable logic device (CPLD) are 10ms.
The CPU of preferred scheme, miscellaneous programmable logic device (CPLD) reads a moment T counting rate statistical value simultaneously every 10ms
It carries out obtaining the counting rate statistical value D at a moment after adding up.
Preferred scheme, default maximum time of the counting rate statistical module are 5.12s, maximum count value 3840,
When judging that a moment T is greater than or equal to the 5.12s or counting rate statistical value D at a moment more than or equal to 3840, then more
The counting rate statistical value D=D/T at a new moment, then sets the counting rate statistical value D at moment T and a moment
Zero.As shown in figure 3, first defining T is counting rate statistical time, D is the statistical value of counting rate in T time, terminal cpu processing routine
Interrupt interval is 10ms, then reads the counting rate statistical value d in complex programmable logic device (CPLD), wherein T=T+
10ms, D=D+d, T and D of each period statistical updating, and judge whether T is more than or equal to whether 5.12s or D is greater than
Equal to 3480, continue statistic mixed-state if it is not, then returning, if it is, counting rate D=D/T is updated, then again again by D and T
Zero setting.
Beneficial effects of the present invention: this detection system based on source range signal provided by the invention, using modularization
Design concept reaches rationally using resource, carries out high pressure superposition, signal amplification, screening and whole by the pulse signal to source range
Shape processing, enables pulse signal to be sampled by CPU board, then that the signal waveform after sampling is for statistical analysis, by wave
Conformal analysis judges whether signal is abnormal, while being compared by calling history case and device to acquire data, judges detection letter
It is number whether abnormal.The system can realize the detection, processing and result output function of source range signal, reach quickly accurate detection
The purpose of system exception.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.
Claims (8)
1. a kind of detection system based on source range signal characterized by comprising detector, high voltage output module, signal tune
Manage Shaping Module and counting rate statistical module；
The detector is for the ray in detection source range channel and generates corresponding pulse signal；
The pulse signal is superimposed upon described continuous by the high voltage output module for exporting continuously adjustable high voltage power supply
Detection signal is obtained in adjustable high voltage power supply；
The signal condition Shaping Module to the detection signal for being filtered, amplifying examination screening and waveform shaping processing
After obtain pulsewidths constant square wave；
The counting rate statistical module is used to carry out the pulsewidths constant square wave statistics and calculates analysis and output signal detection knot
Fruit.
2. the detection system according to claim 1 based on source range signal, it is characterised in that: the detection system is also wrapped
Current device is included, the current device is used to provide directly proportional DC current to the counting rate statistical module.
3. the detection system according to claim 1 based on source range signal, it is characterised in that: the electricity of the high voltage power supply
Pressure size is 900V.
4. the detection system according to claim 1 based on source range signal, it is characterised in that: the detector model
CPNB44 applies boron proportional counter tube.
5. the detection system according to claim 1 based on source range signal, which is characterized in that the signal condition shaping
Module is for obtaining pulsewidths constant square wave tool after examination screening and waveform shaping processing are filtered, amplified to the detection signal
Body includes:
By the detection signal by obtaining low voltage pulse signal after high-pass filter, compare using inverse proportion amplification, voltage
Square wave is obtained after device adjustment, then afterwards by obtaining the stable square wave of impulse amplitude after discriminator screening, and by stable square wave
It is the square wave of pulsewidths constant by complex programmable logic device (CPLD) waveform shaping.
6. the detection system according to claim 5 based on source range signal, which is characterized in that the complex programmable is patrolled
The counting rate measurement period for collecting device CPLD is 10ms.
7. the detection system according to claim 1 based on source range signal, which is characterized in that the counting rate counts mould
Block is used to carry out the pulsewidths constant square wave statistics calculating analysis and output signal testing result specifically includes:
The CPU of complex programmable logic device (CPLD) is obtained after 10ms reads a moment T counting rate statistical value and add up
To the counting rate statistical value D at a moment.
8. the detection system according to claim 7 based on source range signal, it is characterised in that: the counting rate counts mould
The default maximum time of block be 5.12s, maximum count value 3840, when judge a moment T more than or equal to 5.12s or this one
When the counting rate statistical value D at moment is greater than or equal to 3840, then the counting rate statistical value D=D/T at a moment is updated, then will
The equal zero setting of counting rate statistical value D at one moment T and a moment.
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Cited By (1)
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| CN112213766A (en) * | 2020-09-29 | 2021-01-12 | 中广核核电运营有限公司 | Neutron detector reliability verification method and device |
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Effective date of registration: 20200826 Address after: Room 11, 15 / F, R & D building, No. 1, modern service industry base, science and Technology Park, Huazhong University of science and technology, No. 13-1, University Park, Donghu New Technology Development Zone, Wuhan, Hubei Province Co-patentee after: Fujian Shuikou Power Generation Group Co.,Ltd. Patentee after: WUHAN RELABO ENERGY TECHNOLOGY Co.,Ltd. Address before: 430223 University Park No. 13-1, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee before: WUHAN RELABO ENERGY TECHNOLOGY Co.,Ltd. |
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