CN104181601B - nuclear radiation detection system based on ARM7 - Google Patents
nuclear radiation detection system based on ARM7 Download PDFInfo
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- CN104181601B CN104181601B CN201410430548.XA CN201410430548A CN104181601B CN 104181601 B CN104181601 B CN 104181601B CN 201410430548 A CN201410430548 A CN 201410430548A CN 104181601 B CN104181601 B CN 104181601B
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Abstract
The invention discloses a kind of nuclear radiation detection system based on ARM7, including charge sensitive amplifier and liquid-crystal display section, it is characterized in that: charge sensitive amplifier uses CA3140 chip U1, main amplifying circuit includes that pole-zero cancellation circuit U 2, polarity switching U3, adjustable amplification and amplitude limiter circuit U4, integration shape amplifying circuit U5, second order product divides amplifying circuit U6 and baseline restorer circuit U 7；Single channel pulse height analyzer includes that reference voltage U8 arithmetical unit, upper discriminator U9, lower discriminator U10, pulse amplitude trigger circuit U 11, pulse amplitude reverse circuit U13；Peak-holding circuit includes integrating circuit U14, simulation broadening and follow circuit U15, peak value discriminator circuit U16, d type flip flop U17, d type flip flop U18, level reverse circuit U19；Analog to digital conversion circuit is formed by triggering reset circuit U20,12 bit A/D converter U21 and 3 three state buffers U22, U23, U24；Numerical portion is connected by ARM7 LPC2290 U25 and 12864 LCD MODULE U26.Make measurement data more directly perceived.
Description
Technical field
The invention belongs to nuclear spectrum measurement technical field, relate to a kind of nuclear electronics system hardware composition side based on ARM7
Case.Particularly to a kind of nuclear radiation detection system based on ARM7.
Background technology
Nuclear spectrum measurement technology is the strongest comprehensive emerging technology, combines electronic technology, nuclear detection technology, calculating
Multiple subject such as machine technology.At present, one of its important means having become as elemental analysis, at medical science, geology, environment
The subject such as, chemistry, archaeology plays the part of increasingly heavier role.Nucleus band charged particle and rays of electromagnetic radiation, it is possible to use they
The response magnitude produced that interacts of commaterial detects.Along with atomic nucleus the reach of science, people have increasing need for one
A little Detection Techniques carry out quantitative measurement and qualitative investigation to radioprotective.
The safe nuclear energy that utilizes is wanted to be necessary for the detecting devices that the development of corresponding advanced technology is advanced, in actual life
In, nuclear radiation detection and protection are the most requisite, what the protection of own health was obviously made by people develop economical available,
Highly sensitive, the most available detection radioprotective module or instrument seem imperative.
Summary of the invention
The purpose of the present invention is exactly to design a kind of nuclear radiation detection system based on ARM7, make full use of nucleus band charged particle and
Rays of electromagnetic radiation, the response magnitude produced that interacts of they commaterials detects；Employing is micro-to nuclear electron output
Weak signal is acquired and processing and amplifying, finally is digitized processing and display by ARM7.
Technical scheme:
A kind of nuclear radiation detection system based on ARM7, including charge sensitive amplifier, main amplifying circuit, single-channel pulse
Amplitude analyzer, peak-holding circuit, analog to digital conversion circuit, numerical portion ARM7-LPC2290 and liquid-crystal display section, electric charge spirit
Quick amplifier uses CA3140 chip U1, and main amplifying circuit includes pole-zero cancellation circuit U 2, polarity switching U3, adjustable amplification
Shape amplifying circuit U5 with amplitude limiter circuit U4, integration, second order product divides amplifying circuit U6 and baseline restorer circuit U 7；Single-channel pulse width
Degree analyzer includes that reference voltage U8 arithmetical unit, upper discriminator U9, lower discriminator U10, pulse amplitude trigger circuit U 11, pulse
Amplitude reverse circuit U13；Peak-holding circuit includes integrating circuit U14, simulation broadening and follow circuit U15, peak value discriminator circuit
U16, d type flip flop U17, d type flip flop U18, level reverse circuit U19；Analog to digital conversion circuit by trigger reset circuit U20,12
A/d converter U21 and 3 three state buffer U22, U23, U24 compositions；Numerical portion by ARM7-LPC2290 U25 and
12864 LCD MODULE U26 are connected；
No. 6 pins of CA3140 chip U1 connect No. 2 pins of pole-zero cancellation circuit U 2, No. 6 of baseline restorer circuit U 7
Pin connects No. 2 pins of integrating circuit U14, and No. 4 pins of level reverse circuit U19 connect the 13 of 12 bit A/D converter U21
Number pin, the 2 of three state buffer U22,4, No. 6 pins, the 2 of three state buffer U23,4,6, No. 8 pins, three state buffer U24
2,4, No. 6 pins be connected to No. 10 No. 19 pins of ARM7-LPC2290 U25；No. 23 of ARM7-LPC2290 U25
No. 36 pins connect 4 No. 17 pins of 12864 LCD MODULE U26.
The integrating circuit feedback that No. 6 pins of CA3140 chip U1 are constituted through RC receive pole-zero cancellation circuit U 2 No. 2 are drawn
Foot, front end signal improves output waveform after pole-zero cancellation circuit U 2；The negative feedback that polarity switching U3 consists of RC is returned
Road changes the polarity of input signal；No. 6 pins of polarity switching U3 be connected to adjustable amplification and amplitude limiter circuit U4 No. 1 is drawn
No. 3 pins that No. 8 pins of foot, adjustable amplification and amplitude limiter circuit U4 shape amplifying circuit U5 with integration are connected, and integration shapes to be put
Big circuit U 5 is the active integral filter circuit of two-stage being made up of CA3140 chip U1, and No. 6 of integration shaping amplifying circuit U5 are drawn
Foot feeds back to integration by the integrating network that RC is constituted and shapes No. 2 pins of amplifying circuit U5；Integration shapes the 6 of amplifying circuit U5
Number pin connects second order product and divides No. 3 pins of amplifying circuit U6 to realize multi-stage integral to shape and amplify, and second order product divides the 6 of amplifying circuit U6
Number pin receives No. 1 pin of baseline restorer circuit U 7 again, and No. 1 of reference voltage U8 arithmetical unit and No. 14 pins are coupled with
No. 2 pins of discriminator U9 and lower discriminator U10, measured signal divides two-way to receive the anti-of discriminator U9 and lower discriminator U10
To input, upper discriminator U9 and lower discriminator U10 is screened out signal and is turned over by pulse amplitude triggering circuit U 11 and pulse amplitude
Shifting circuit U13 exports.
Carrying out spectral measurement when, surveyed is the summit amplitude of pulse, owing to detector output signal is amplified
Its summit width of pulse signal after shaping is narrow, makes peak value of pulse keep for the moment after peak holding circuit exports
Between enter in subsequent conditioning circuit；In above-mentioned analog-digital converter, input signal is inputted by No. 28 pins of a/d converter U21, number
Export according to from analog-digital converter U21 No. 18 No. 27 pins, then be connected respectively to three state buffer U22 No. 13 No. 18 are drawn
Foot, No. 11 No. 18 pins of three state buffer U23 and No. 13 No. 18 pins of three state buffer U24, ARM7-LPC2290
No. 23 No. 36 pins of U25 connect No. 4 No. 17 pins of HS12864D LCD MODULE U26.
The present invention uses module design idea, and functions of modules is clear and definite to be connected each other again, and each module can individually be tested, whole
Individual system is from the collection of charge signal and conversion, to last digitized processing and display.The quantitative survey of radioprotective can be met
Amount and the qualitative investigation requirement to Detection Techniques, technically include that the multichannel to signal is amplified and processes, control based on ARM7
Function so that whole measurement process can by the program finished in advance, automatically carry out data acquisition, transmit, process, store, logical
News and display etc., thus realize the automatization of whole measurement process.It is right that the present invention can also meet on nuclear electronics instruments used for education
Requirement on nuclear electron Signal acquiring and processing, it is possible to its waveform is shown by the difference for input signal so that measure
Data are more directly perceived.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is charge sensitive amplifier of the present invention and main amplifying circuit schematic diagram
Fig. 3 is single channel pulse height analyzer circuit diagram of the present invention；
Fig. 4 is peak-holding circuit circuit diagram of the present invention；
Fig. 5 is analog to digital conversion circuit schematic diagram of the present invention；
Fig. 6 is ARM7 of the present invention and LCD MODULE circuit diagram.
Detailed description of the invention
The present invention can be embodied as by foregoing invention technical scheme, is reported by following technology experiment and embodiment is made
Further illustrate, but, the scope of the present invention is not limited to following embodiment.
Embodiment 1:
A kind of nuclear radiation detection system based on ARM7, including charge sensitive amplifier, main amplifying circuit, single-channel pulse width
Degree analyzer, peak-holding circuit, analog to digital conversion circuit, numerical portion ARM7-LPC2290 and liquid-crystal display section, charge-sensitive
Amplifier use CA3140 chip U1, main amplifying circuit include pole-zero cancellation circuit U 2, polarity switching U3, adjustable amplification and
Amplitude limiter circuit U4, integration shape amplifying circuit U5, second order product divides amplifying circuit U6 and baseline restorer circuit U 7；Single-channel pulse amplitude
Analyzer includes that reference voltage U8 arithmetical unit, upper discriminator U9, lower discriminator U10, pulse amplitude trigger circuit U 11, pulse width
Degree reverse circuit U13；Peak-holding circuit includes integrating circuit U14, simulation broadening and follow circuit U15, peak value discriminator circuit
U16, d type flip flop U17, d type flip flop U18, level reverse circuit U19；Analog to digital conversion circuit by trigger reset circuit U20,12
A/d converter U21 and 3 three state buffer U22, U23, U24 compositions；Numerical portion by ARM7-LPC2290 U25 and
12864 LCD MODULE U26 are connected；
No. 6 pins of CA3140 chip U1 connect No. 2 pins of pole-zero cancellation circuit U 2, No. 6 of baseline restorer circuit U 7
Pin connects No. 2 pins of integrating circuit U14, and No. 4 pins of level reverse circuit U19 connect the 13 of 12 bit A/D converter U21
Number pin, the 2 of three state buffer U22,4, No. 6 pins, the 2 of three state buffer U23,4,6, No. 8 pins, three state buffer U24
2,4, No. 6 pins be connected to No. 10 No. 19 pins of ARM7-LPC2290 U25；No. 23 of ARM7-LPC2290 U25
No. 36 pins connect 4 No. 17 pins of 12864 LCD MODULE U26.
The integrating circuit feedback that No. 6 pins of CA3140 chip U1 are constituted through RC receive pole-zero cancellation circuit U 2 No. 2 are drawn
Foot；The negative feedback loop of polarity switching U3 with RC composition is connected；No. 6 pins of polarity switching U3 are connected to adjustable putting
Big and No. 1 pin of amplitude limiter circuit U4, adjustable amplification and amplitude limiter circuit U4 No. 8 pins shape the 3 of amplifying circuit U5 with integration
Number pin is connected, and it is the active integral filter circuit of two-stage being made up of CA3140 chip U1 that integration shapes amplifying circuit U5, integration
No. 6 pins shaping amplifying circuit U5 feed back to No. 2 pins of integration shaping amplifying circuit U5 by the integrating network that RC is constituted；
Integration shapes No. 6 pins of amplifying circuit U5 and connects No. 3 pins that second order product divides amplifying circuit U6, and second order product divides amplifying circuit U6's
No. 6 pins receive No. 1 pin of baseline restorer circuit U 7 again, and No. 1 of reference voltage U8 arithmetical unit and No. 14 pins are coupled with
No. 2 pins of upper discriminator U9 and lower discriminator U10, measured signal divides two-way to receive discriminator U9's and lower discriminator U10
Reverse input end, upper discriminator U9 and lower discriminator U10 screen out signal and trigger circuit U 11 and pulse amplitude by pulse amplitude
Reverse circuit U13 exports.
In analog to digital conversion circuit, input signal is inputted by No. 28 pins of a/d converter U21, and data are from analog digital conversion
No. 18 No. 27 pins outputs of device U21, then it is connected respectively to No. 13 No. 18 pins of three state buffer U22, Three-State
No. 11 No. 18 pins of device U23 and No. 13 No. 18 pins of three state buffer U24, No. 23 of ARM7-LPC2290 U25
No. 36 pins connect No. 4 No. 17 pins of HS12864D LCD MODULE U26.
Above-mentioned U1 used makes circuit have big input impedance and little output impedance, and has the least bias current,
The integrating circuit of feedback end RC composition provides charging and discharging circuit for electric capacity.U2 eliminates by changing different resistances and capacitance
The undershoot of signal, improves output waveform.U3 can change the polarity of input signal by negative feedback loop, and No. 6 pins of U3 connect
No. 1 pin of U4, when the pulse amplitude of prime signal is excessive, can be amplified further by U3, and prime signal through U4 it
After can limit the amplitude of signal, anti-stop signal produces distortion.
No. 8 pins of U4 are connected with No. 3 pins of U5, and U5 is the active integral filter circuit of the two-stage being made up of U1 and RC,
Its No. 6 pins of output connect No. 3 pins of U6 again, to realize multi-stage integral shaping, can obtain quasi-high bass wave at U6 No. 6 pin
The output of shape.
When input pulse signal frequency is the highest when, owing to the discharge and recharge of coupling electric capacity makes the baseline of output signal produce
U6 No. 6 pins are received No. 1 pin of U7 by raw skew for this, allow the baseline restorer of signal to original position.Above-mentioned single track
In pulse-height analyzer, No. 1 of U8 and No. 14 pins are coupled with No. 2 pins of U9 and U10, and required reference voltage is through U8
The voltage of rear generation 4V and 2V is respectively outputted to U9 and U10, and as its discrimination voltage, (wherein 2V and 4V voltage can be according to reality
Situation is adjusted) from U9 and U10 No. 7 pin outputs.Prime signal realizes integration output through U13, when input signal is in
Time between discrimination voltage scope, more just have differential output through U13, complete the function of single-channel pulse amplitude discriminator.
Above-mentioned peak-holding circuit is mainly used in the summit broadening of pulse signal, due to the amplified one-tenth of detector output signal
Its summit width of pulse signal after shape is narrow, utilizes the storage effect of capacitor, permissible after U14, U15 export
Peak value of pulse is made to keep a period of time to be input in subsequent conditioning circuit.U16, U17 are for controlling and differentiate the peak value of simulation stretcher.
In above-mentioned analog-digital converter, U20 is used for producing U21 work schedule, triggers the transformation process of AD.Input signal is passed through
No. 28 pins input of U21, converted after from U21 No. 18 No. 27 pins outputs, then be connected respectively to U22, U23, U24.
No. 10 No. 19 pins of U25 connect the output of U15, U16, U17, and No. 23 No. 36 pins of U25 connect 4 No. 17 feet of U26.Whole
Individual process is from the collection of charge signal and process, to last digitized processing and display.
In the present embodiment in addition to having special instruction, the U1 U26 that it relates to is universal circuit or electronic device.
Claims (3)
1. a nuclear radiation detection system based on ARM7, it is characterised in that include,
Charge sensitive amplifier, charge sensitive amplifier uses CA3140 chip U1；
Main amplifying circuit, main amplifying circuit includes pole-zero cancellation circuit U 2, polarity switching U3, adjustable amplification and amplitude limiter circuit
U4, integration shape amplifying circuit U5, second order product divides amplifying circuit U6 and baseline restorer circuit U 7；
Single channel pulse height analyzer, single channel pulse height analyzer includes reference voltage U8 arithmetical unit, upper discriminator U9, lower Zhen
Other device U10, pulse amplitude trigger circuit U 11, pulse amplitude reverse circuit U13；
Peak-holding circuit, peak-holding circuit includes integrating circuit U14, simulation broadening and follow circuit U15, peak value discriminator circuit
U16, d type flip flop U17, d type flip flop U18, level reverse circuit U19；
Analog to digital conversion circuit, analog to digital conversion circuit is by triggering reset circuit U20,12 bit A/D converter U21 and 3 three state buffers
U22, U23, U24 form；
And
Numerical portion ARM7-LPC2290 and liquid-crystal display section, numerical portion passes through ARM7-LPC2290 U25 and 12864 liquid
Brilliant display module U26 is connected；
No. 6 pins of CA3140 chip U1 connect No. 2 pins of pole-zero cancellation circuit U 2, No. 6 pins of baseline restorer circuit U 7
Connecting No. 2 pins of integrating circuit U14, No. 4 pins of level reverse circuit U19 connect 12 bit A/D converter U21 No. 13 are drawn
Foot, the 2 of three state buffer U22,4, No. 6 pins, the 2 of three state buffer U23,4,6, No. 8 pins, the 2 of three state buffer U24,
4, No. 6 pins are connected to No. 10 No. 19 pins of ARM7-LPC2290 U25；No. 23 No. 36 of ARM7-LPC2290 U25
Pin connects 4 No. 17 pins of 12864 LCD MODULE U26.
A kind of nuclear radiation detection system based on ARM7 the most according to claim 1, it is characterised in that: CA3140 chip U1
The integrating circuit feedback that constitutes through RC of No. 6 pins receive No. 2 pins of pole-zero cancellation circuit U 2, front end signal is through pole-zero cancellation
Output waveform is improved after circuit U 2；Polarity switching U3 changes the polarity of input signal by the negative feedback loop that RC forms；
No. 6 pins of polarity switching U3 are connected to No. 1 pin of adjustable amplification and amplitude limiter circuit U4, adjustable amplification and amplitude limiter circuit
No. 3 pins that No. 8 pins of U4 shape amplifying circuit U5 with integration are connected, and it is by CA3140 chip that integration shapes amplifying circuit U5
The active integral filter circuit of two-stage that U1 is constituted, integration shapes the integrating network that No. 6 pins of amplifying circuit U5 are consisted of RC
Feed back to integration and shape No. 2 pins of amplifying circuit U5；No. 6 pins of integration shaping amplifying circuit U5 connect second order product and divide amplification electricity
No. 3 pins of road U6 realize multi-stage integral and shape amplification, and second order product divides No. 6 pins of amplifying circuit U6 to receive baseline restorer electricity again
No. 1 pin of road U7, No. 1 of reference voltage U8 arithmetical unit and No. 14 pins are coupled with discriminator U9 and lower discriminator U10
No. 2 pins, measured signal divides two-way to receive discriminator U9 and the reverse input end of lower discriminator U10, upper discriminator U9 and
Lower discriminator U10 is screened out signal and is exported by pulse amplitude triggering circuit U 11 and pulse amplitude reverse circuit U13.
A kind of nuclear radiation detection system based on ARM7 the most according to claim 1 and 2, it is characterised in that: carrying out energy
The when of spectrometry, surveyed is the summit amplitude of pulse, due to the pulse signal after the amplified shaping of detector output signal
Its summit width is narrow, makes peak value of pulse keep the time to enter into subsequent conditioning circuit after peak holding circuit exports
In；In above-mentioned analog-digital converter, input signal is inputted by No. 28 pins of 12 bit A/D converter U21, and data turn from 12 AD
No. 18 No. 27 pins outputs of parallel operation U21, then it is connected respectively to No. 13 No. 18 pins of three state buffer U22, tri-state is delayed
Rush No. 11 No. 18 pins of device U23 and No. 13 No. 18 pins of three state buffer U24, the 23 of ARM7-LPC2290 U25
Numbers No. 36 pins connect No. 4 No. 17 pins of 12864 LCD MODULE U26.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410430548.XA CN104181601B (en) | 2014-08-28 | 2014-08-28 | nuclear radiation detection system based on ARM7 |
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| CN201410430548.XA CN104181601B (en) | 2014-08-28 | 2014-08-28 | nuclear radiation detection system based on ARM7 |
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| CN104181601A CN104181601A (en) | 2014-12-03 |
| CN104181601B true CN104181601B (en) | 2016-09-21 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105301627B (en) * | 2015-11-23 | 2018-10-09 | 重庆大学 | A kind of energy spectrum analysis method, energy spectrum analysis system and gamma-ray detection system |
| CN105958955B (en) * | 2016-06-02 | 2019-03-15 | 中国科学院高能物理研究所 | Signal amplifier and its positron annihilation lifetime measurement system |
| CN108614288A (en) * | 2016-12-10 | 2018-10-02 | 中国科学院长春光学精密机械与物理研究所 | A kind of gamma spectrum measuring system based on FPGA |
| CN106680863B (en) * | 2016-12-12 | 2023-06-23 | 烟台大学 | Neutron tube |
| CN108449072A (en) * | 2017-12-23 | 2018-08-24 | 黄仕权 | Pulse amplifying method for broad stopband II-VI group compound semiconductor detector |
| CN108155893A (en) * | 2017-12-23 | 2018-06-12 | 黄仕权 | For the pulse signal amplification method of wide bandgap semiconductor detector |
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| US7672426B2 (en) * | 2002-12-04 | 2010-03-02 | Varian Medical Systems, Inc. | Radiation scanning units with reduced detector requirements |
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| CN102124378A (en) * | 2008-07-14 | 2011-07-13 | Icx科技有限责任公司 | Detector system for the measurement of radiation |
| CN102985852A (en) * | 2010-05-07 | 2013-03-20 | Cbg公司 | Directional radiation detection tool |
| WO2011160690A1 (en) * | 2010-06-23 | 2011-12-29 | Arktis Radiation Detectors Ltd. | A method for obtaining information about a radiation source or a material interacting with a radiation source and a measurement setup for performing the method |
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