CN103413584A - Microcurrent treating device for ex-core nuclear measurement system - Google Patents
Microcurrent treating device for ex-core nuclear measurement system Download PDFInfo
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- CN103413584A CN103413584A CN2013103285592A CN201310328559A CN103413584A CN 103413584 A CN103413584 A CN 103413584A CN 2013103285592 A CN2013103285592 A CN 2013103285592A CN 201310328559 A CN201310328559 A CN 201310328559A CN 103413584 A CN103413584 A CN 103413584A
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- measurement system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention provides a microcurrent treating device for an ex-core nuclear measurement system. The microcurrent treating device comprises a linear amplifier circuit, wherein the linear amplifier circuit is connected with a compensated ionization chamber detector of the intermediate range of the ex-core nuclear measurement system; a microcurrent signal detected by the compensated ionization chamber detector is converted into an output voltage; the linear amplifier circuit is an inverse closed loop amplifier circuit; while the input impedance of an operational amplifier of the inverse closed loop amplifier circuit is larger than 1,014 omega, and the bias current is below 1 pA, so that a main amplifier of the linear amplifier circuit has higher input impedance and lower bias current, and can be used for processing the microcurrent signal (10<-3> to 101<-11>A spanning nine orders of magnitudes) detected by the compensated ionization chamber detector of the intermediate range of the ex-core nuclear measurement system. In addition, the device has the advantages that the microcurrent signal detected by compensated ionization chamber detector of the intermediate range of the ex-core nuclear measurement system is processed by the linear amplifier circuit, not only the process is simple, but also the linearity is good and the precision is high.
Description
Technical field
The present invention relates to the reactor outer core and measure, relate in particular to micro-current processing of the outer nuclear measurement system intermediate quantity journey of reactor.
Background technology
Out-pile nuclear instrument system (RPN) is to utilize the axial distribution that is distributed in outer a series of neutron detector continuous monitoring reactor capabilities, power variation rate and power of reactor pressure vessel, is one of important system be directly connected to reactor safety.Reactor is from starting to Operation at full power, and the dynamic change scope of its core power reaches 11 orders of magnitude, specifically from rated power 10
-9%～200%, used a kind of detector and circuit to can not meet requirement.Therefore, conventional core instrument system adopts 8 independent measurement passages of three kinds of different ranges to measure reactor capability: i.e. range passages and 4 power range passages in the middle of 2 source range passages, 2.They are equipped with the different detector different with measurement range of performance separately.Wherein, the sensitivity of middle range is also higher, and it is measured gear and crosses over 9 orders of magnitude, and corresponding micro-current signal is 10
-3～101
-11A, to this, in prior art, in the pressurized-water reactor nuclear power plant out-pile nuclear measurement system moved, middle range micro current amplifier is all to adopt logarithmic amplifier to realize, this Design of Amplification Circuit complex process, logarithmic amplifier are all that to utilize the PN junction voltage (solid electronic device) of crystal diode be the logarithmic function of junction current usually, and the load or the feedback element that use it as amplifying circuit can make amplifier have the logarithm amplitude characteristic.The circuit principle is simple in this way although make, but usually can only be less than the input dynamic range of 50 decibels, and the frequency band of amplifier is subjected to the restriction of PN junction electric capacity, can not be too wide, utilize simultaneously the technique circuit conditioning technique more complicated of this crystal diode log characteristic, the success ratio in implementation procedure is relatively low.
To sum up, be badly in need of micro-current treatment device of the outer nuclear measurement system of a kind of reactor addressed the above problem.
Summary of the invention
The purpose of this invention is to provide a kind of should the micro-current treatment device of out-pile nuclear measurement system, utilize the linear amplifier principle realize should the micro-current signal of out-pile nuclear measurement system amplification, technique is simple, the linearity good, precision is high.
To achieve these goals, the invention provides a kind of micro-current treatment device for the outer nuclear measurement system of reactor, comprise linear amplifier circuit, described linear amplifier circuit is connected with compensated ionization chamber's detector of the outer nuclear measurement system intermediate quantity journey of reactor, and micro-current signal that described compensated ionization chamber detector is detected is converted to output voltage, described linear amplifier circuit is anti-phase closed-loop amplifying circuit, and the input impedance of the operational amplifier of described anti-phase closed-loop amplifying circuit is 10
14More than Ω, bias current is below 1pA.
The micro-electric current detected due to the outer nuclear measurement system of reactor is very little, and wherein detector micro-electric current of providing in compensated ionization chamber's is minimum reaches 10
-11A(is equivalent to signal source output impedance and reaches 100G Ω), therefore existing linear amplifier is difficult to detect so little electric current, the input impedance of the operational amplifier of linear amplifier circuit of the present invention is 10
14More than Ω, bias current is below 1pA, makes the main amplifier of linear amplifier circuit of the present invention have high input impedance and extremely low bias current, can be used for micro-current signal (10 of detection reaction heap out-pile nuclear measurement system output
-3～101
-11A crosses over 9 magnitudes).Therefore compared with prior art, the present invention uses micro-current signal of linear amplifier circuit processing reaction heap out-pile nuclear measurement system output, not only technique is simple, and the linearity is good, precision is high.
Preferably, on the backfeed loop of described linear amplifier circuit, be parallel with Circuit tuning, described Circuit tuning comprises rheostat and analog switch, described analog switch is connected with described rheostat and regulates described rheostatic resistance according to the electric current gear of described micro-current signal, and the leakage current of described analog switch is below 1pA.In this scheme, described analog switch is according to the different rheostat resistance of different gear coupling of micro-current signal of the outer nuclear measurement system output of reactor, and the range switching is simple, and the response time is fast.
Particularly, described rheostat is high-performance enamel high resistant.
Particularly, be parallel with variable condenser on described rheostat, described analog switch is regulated the capacitance of described variable condenser according to the response time of the outer nuclear measurement system of reactor.Described variable condenser has effectively improved the antijamming capability of whole circuit.More specifically, described variable condenser is teflon electric capacity, makes the insulation resistance of described variable condenser high.
Particularly, described linear amplifier circuit also comprises the potential transfer circuit, described potential transfer circuit comprises the first resistance and the second resistance, described the first resistance is serially connected with on described backfeed loop and between the output terminal of the input end of the feedback resistance of described backfeed loop and operational amplifier, described the second resistance is connected between the input end and ground of described feedback resistance.Described potential transfer circuit, by potential transfer, effectively reduces the required resistance of rheostat when deep low gear.
More specifically, described rheostatic high value is 10G Ω, and the resistance of the feedback resistance of described backfeed loop is 1G Ω, and described the first resistance is 9K Ω, and described the second resistance is 1K Ω.When this scheme made deep low gear, this gear equivalence feedback resistance had enlarged ten times.
Particularly, described analog switch is high-speed analog switch MAX338.
Preferably, on the backfeed loop of described linear amplifier circuit, be parallel with feedback capacity.
Preferably, described linear amplifier circuit also comprises a JFET pipe and the 2nd JFET pipe, the in-phase input end of the described operational amplifier of input termination of a described JFET pipe, the inverting input of the described operational amplifier of output termination, the inverting input of the described operational amplifier of input termination of described the 2nd JFET pipe, the in-phase input end of the described operational amplifier of output termination, and the leakage current of a described JFET pipe and the 2nd JFET pipe is below 1pA, this scheme has effectively suppressed the leakage current of whole linear amplifier circuit, during anti-locking system operation, described operational amplifier receives that external disturbance causes damage.
Preferably, described operational amplifier is electrostatic integrated operational amplifier OPA128.Certainly, described operational amplifier can be also other high input impedances, the operational amplifier of Low-bias Current.
Preferably, the inverting input of described operational amplifier and/or in-phase input end are installed on the circuit board of described linear amplifier circuit by insulated terminal.Due to the insulation resistance that covers copper circuit board, generally at 10M ohm/mm, so ordinary circuit board can't make the insulation resistance between described operational amplifier in-phase input end and inverting input enough large, for example remain on 10
15More than Ω, therefore the present invention, by the unsettled installation of the input end of described operational amplifier, namely is installed on the input end of described operational amplifier on insulated terminal, then insulated terminal is installed on circuit board.
Preferably, described micro-current treatment device for the outer nuclear measurement system of reactor also comprises the shielding box that the high-carbon steel material is made, described linear amplifier circuit is installed in described shielding box hermetically, not only shield effectiveness is good, all kinds of interference can be effectively shielded, and the drying property in shielding box can be guaranteed.Particularly, described shielding box skin is provided with copper plate, nexine is provided with silver coating, realizes multilayer screen, and shield effectiveness is good.
Preferably, the circuit board of described linear amplifier circuit adopts the distributed earthing mode of multiple spot to connect up, and makes described linear amplifier circuit as far as possible effectively discharge and disturb in the course of the work.
The accompanying drawing explanation
Fig. 1 is the structured flowchart for micro-current treatment device of the outer nuclear measurement system of reactor.
Fig. 2 is the circuit theory diagrams of linear amplifier circuit of the present invention.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, being realized purpose and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
With reference to figure 1, the invention provides a kind of micro-current treatment device for the outer nuclear measurement system of reactor, comprise linear amplifier circuit 10, compensated ionization chamber's detector 20 of the outer nuclear measurement system of described linear amplifier circuit 10 and reactor is connected, and micro-current signal I that described compensated ionization chamber detector 20 is detected
InBe converted to output voltage V
out.
With reference to figure 2, described linear amplifier circuit 10 is anti-phase closed-loop amplifying circuit, comprises operational amplifier A 1, and the input impedance of described operational amplifier A 1 is 10
14More than Ω, bias current is below 1pA, makes operational amplifier A 1 of the present invention have high input impedance and extremely low bias current, and bias current is submerged near the input signal input signal to such an extent as to prevent.Particularly, between the output terminal of described operational amplifier A 1 (6 pin) and inverting input (2 pin), be connected with feedback resistance R, to form the backfeed loop of described linear amplifier circuit 10, during work, micro-current signal I that described compensated ionization chamber detector 20 detects
InBy resistance R 1, be delivered to inverting input (2 pin), be converted to output voltage V after operational amplifier A 1 is amplified processing
outAnd export from output terminal (6 pin).Wherein, the in-phase input end of described operational amplifier A 1 (3 pin), by resistance R 2 ground connection, also is connected to filter capacitor C1 between the input end of described linear amplifier circuit 10 and ground.4 pin of described operational amplifier A 1 meet electrical source of power VE, and 7 pin meet electrical source of power VS, and above-mentioned electrical source of power is all selected high stability, low ripple linear power supply.Wherein, described operational amplifier is electrostatic integrated operational amplifier OPA128.Certainly, described operational amplifier can be also other high input impedances, the operational amplifier of Low-bias Current.
The preferably, also be parallel with feedback capacity C on described backfeed loop, described feedback capacity C is 1pF.
Preferably, on the backfeed loop of described linear amplifier circuit 10, be parallel with Circuit tuning 30, described Circuit tuning 30 comprises rheostat R
XWith analog switch K
X, described analog switch K
XWith described rheostat R
XBe connected and the described micro-current signal I of foundation
InThe electric current gear regulate described rheostat R
XResistance, and described analog switch K
XLeakage current be below 1pA.Wherein, analog switch K
XControl code, micro-current signal I
InElectric current gear and rheostat R
XContrast relationship as shown in table 1 below:
| I in(A) | R X(Ω) | Control code (A/B/C) |
| 10 -3 | 100 | 000 |
| 10 -4 | 1K | 001 |
| 10 -5 | 10K | 010 |
| 10 -6 | 100K | 011 |
| 10 -7 | 1M | 100 |
| 10 -8 | 10M | 101 |
| 10 -9 | 100M | 110 |
| 10 -10 | 1G | 111 |
| 10 -11 | 1G | --- |
Table 1
To sum up, described analog switch K
XMicro-current signal I according to 20 outputs of compensated ionization chamber's detector
InThe different rheostat R of different gears coupling
XResistance, the range switching is simple, and the response time is fast.As micro-current signal I
InFrom after the input end input of linear amplifier circuit 10, be converted to V through amplification
out, V
out=I
In* R
X.Wherein, described rheostat R
XFor high-performance enamel high resistant, described rheostat R
XHigh value be more than 1G Ω, the resistance of the feedback resistance R of described backfeed loop is 1G Ω, resistance R 1 and resistance R 2 are resistance much smaller than rheostat R
XResistance.Wherein, described analog switch K
XFor high-speed analog switch MAX338.
Particularly, with reference to figure 2, described Circuit tuning 30 also comprises and is parallel to rheostat R
XOn variable condenser C
X, described analog switch K
XResponse time according to compensated ionization chamber's detector is regulated described variable condenser C
XCapacitance.Described variable condenser C
XEffectively improve the antijamming capability of whole linear amplifier circuit 10, made described variable condenser C
XSize and the response time of described compensated ionization chamber detector be complementary, heighten as much as possible capacitance.More specifically, described variable condenser C
XFor teflon electric capacity, make described variable condenser C
XInsulation resistance high.
Particularly, described linear amplifier circuit 10 also comprises potential transfer circuit 40, described potential transfer circuit 40 comprises the first resistance R 3 and the second resistance R 4, described the first resistance R 3 is serially connected with on described backfeed loop and between the output terminal of the input end of the feedback resistance R of described backfeed loop and operational amplifier A 1, described the second resistance R 4 is connected between the input end and ground of described feedback resistance R.Described potential transfer circuit 40, by potential transfer, effectively reduces rheostat R when deep low gear
XRequired resistance, make described output voltage V out=I
In* R
X* (R3+R4)/R4.More specifically, described the first resistance is 9K Ω, and described the second resistance is 1K Ω, therefore this embodiment has enlarged ten times according to the potential transfer circuit, and rheostat R while effectively reducing deep low gear
XRequired resistance, improved amplification precision and the linearity of I-V in linear amplifier circuit 10, simplified design technique.
Preferably, described linear amplifier circuit 10 also comprises a JFET pipe D1 and the 2nd JFET pipe D2, the in-phase input end (3 pin) of the described operational amplifier A 1 of input termination of a described JFET pipe D1, the inverting input (2 pin) of the described operational amplifier A 1 of output termination, the inverting input (2 pin) of the described operational amplifier A 1 of input termination of described the 2nd JFET pipe D2, the in-phase input end (3 pin) of the described operational amplifier A 1 of output termination, and the leakage current of a described JFET pipe D1 and the 2nd JFET pipe D2 is below 1pA, this scheme has effectively suppressed the leakage current of whole linear amplifier circuit 10, during anti-locking system operation, described operational amplifier A 1 receives that external disturbance causes damage.
Preferably, the inverting input of described operational amplifier A 1 (2 pin) and/or in-phase input end (3 pin) are installed on by insulated terminal on the circuit board of described linear amplifier circuit 10, be about to the unsettled installation of input end of described operational amplifier A 1, make the insulation resistance between described operational amplifier A 1 in-phase input end (3 pin) and inverting input (2 pin) enough large, for example remain on 10
15More than Ω.
Wherein, described micro-current treatment device for the outer nuclear measurement system of reactor also comprises the shielding box that the high-carbon steel material is made, described linear amplifier circuit 10 is installed in described shielding box hermetically, not only shield effectiveness is good, all kinds of interference can be effectively shielded, and the drying property in shielding box can be guaranteed.Particularly, described shielding box skin is provided with copper plate, nexine is provided with silver coating, realizes multilayer screen, and shield effectiveness is good.The circuit board of described linear amplifier circuit 10 adopts the distributed earthing mode of multiple spot to connect up, and makes described linear amplifier circuit 10 as far as possible effectively discharge and disturb in the course of the work.
Above disclosed is only the preferred embodiments of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the present patent application the scope of the claims, still belong to the scope that the present invention is contained.
Claims (15)
1. micro-current treatment device for the outer nuclear measurement system of reactor, it is characterized in that: comprise linear amplifier circuit, described linear amplifier circuit is connected with compensated ionization chamber's detector of the outer nuclear measurement system intermediate quantity journey of reactor, and micro-current signal that described compensated ionization chamber detector is detected is converted to output voltage, described linear amplifier circuit is anti-phase closed-loop amplifying circuit, and the input impedance of the operational amplifier of described anti-phase closed-loop amplifying circuit is 10
14More than Ω, bias current is below 1pA.
2. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 1, it is characterized in that: be parallel with Circuit tuning on the backfeed loop of described linear amplifier circuit, described Circuit tuning comprises rheostat and analog switch, described analog switch is connected with described rheostat and regulates described rheostatic resistance according to the electric current gear of described micro-current signal, and the leakage current of described analog switch is below 1pA.
3. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 2, it is characterized in that: described rheostat is high-performance enamel high resistant.
4. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 2, it is characterized in that: on described rheostat, be parallel with variable condenser, described analog switch is regulated the capacitance of described variable condenser according to the response time of the outer nuclear measurement system of reactor.
5. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 4, it is characterized in that: described variable condenser is teflon electric capacity.
6. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 2, it is characterized in that: described linear amplifier circuit also comprises the potential transfer circuit, described potential transfer circuit comprises the first resistance and the second resistance, described the first resistance is serially connected with on described backfeed loop and between the output terminal of the input end of the feedback resistance of described backfeed loop and operational amplifier, described the second resistance is connected between the input end and ground of described feedback resistance.
7. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 6, it is characterized in that: described rheostatic high value is more than 1G Ω, the resistance of the feedback resistance of described backfeed loop is 1G Ω, and described the first resistance is 9K Ω, and described the second resistance is 1K Ω.
8. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 2, it is characterized in that: described analog switch is high-speed analog switch MAX338.
9. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 1, is characterized in that: be parallel with feedback capacity on the backfeed loop of described linear amplifier circuit.
10. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 1, it is characterized in that: described linear amplifier circuit also comprises a JFET pipe and the 2nd JFET pipe, the in-phase input end of the described operational amplifier of input termination of a described JFET pipe, the inverting input of the described operational amplifier of output termination, the inverting input of the described operational amplifier of input termination of described the 2nd JFET pipe, the in-phase input end of the described operational amplifier of output termination, and the leakage current of a described JFET pipe and the 2nd JFET pipe is below 1pA.
11. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 1, it is characterized in that: described operational amplifier is electrostatic integrated operational amplifier OPA128.
12. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 1, it is characterized in that: the inverting input of described operational amplifier and/or in-phase input end are installed on the circuit board of described linear amplifier circuit by insulated terminal.
13. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 1, it is characterized in that: also comprise the shielding box that the high-carbon steel material is made, described linear amplifier circuit is installed in described shielding box hermetically.
14. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 13, it is characterized in that: described shielding box skin is provided with copper plate, nexine is provided with silver coating.
15. the micro-current treatment device for the outer nuclear measurement system of reactor as claimed in claim 1 is characterized in that: the circuit board of described linear amplifier circuit adopts the distributed earthing mode of multiple spot to connect up.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057259A (en) * | 2016-04-22 | 2016-10-26 | 中国科学院上海应用物理研究所 | Reactor nuclear measurement system |
| CN106712726A (en) * | 2017-01-11 | 2017-05-24 | 中国核动力研究设计院 | Self-powered detector current signal amplification circuit |
| CN107146647A (en) * | 2017-04-20 | 2017-09-08 | 岭东核电有限公司 | A kind of portable neutron detection device |
| CN112382424A (en) * | 2020-11-10 | 2021-02-19 | 中国核动力研究设计院 | Monitoring device under low neutron fluence rate and data processing method thereof |
| CN112798855A (en) * | 2020-12-29 | 2021-05-14 | 北京无线电计量测试研究所 | Fly-ampere-level direct-current micro-current signal measuring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106057259A (en) * | 2016-04-22 | 2016-10-26 | 中国科学院上海应用物理研究所 | Reactor nuclear measurement system |
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| CN106712726A (en) * | 2017-01-11 | 2017-05-24 | 中国核动力研究设计院 | Self-powered detector current signal amplification circuit |
| CN107146647A (en) * | 2017-04-20 | 2017-09-08 | 岭东核电有限公司 | A kind of portable neutron detection device |
| CN107146647B (en) * | 2017-04-20 | 2019-05-21 | 岭东核电有限公司 | A kind of portable neutron detection device |
| CN112382424A (en) * | 2020-11-10 | 2021-02-19 | 中国核动力研究设计院 | Monitoring device under low neutron fluence rate and data processing method thereof |
| CN112798855A (en) * | 2020-12-29 | 2021-05-14 | 北京无线电计量测试研究所 | Fly-ampere-level direct-current micro-current signal measuring system |
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Application publication date: 20131127 |