CN202771001U - Digitalized [gamma] nuclide identification instrument - Google Patents
Digitalized [gamma] nuclide identification instrument Download PDFInfo
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- CN202771001U CN202771001U CN 201220412362 CN201220412362U CN202771001U CN 202771001 U CN202771001 U CN 202771001U CN 201220412362 CN201220412362 CN 201220412362 CN 201220412362 U CN201220412362 U CN 201220412362U CN 202771001 U CN202771001 U CN 202771001U
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Abstract
The utility model relates to a detection instrument, in particular to a digitalized [gamma] nuclide identification instrument. On account of the problem that the irreconcilable contradiction between energy resolution and pulse passing rate cannot be overcome in the prior art, the digitalized [gamma] nuclide identification instrument is provided to realize digitalized measurement through a probe module, an ADC processing module, an FPGA processing module, and an embedded processing module, thereby performing analysis and identification of nuclides in a very good manner. The instrument comprises the probe module, the ADC processing module, the FPGA processing module, and the embedded processing module. An output terminal of the probe module is connected with the embedded processing module by sequentially passing through the ADC processing module and the FPGA processing module. The instrument is mainly applied to the digital detection field.
Description
Technical field
The utility model relates to detecting instrument, especially relates to a kind of digitized γ nuclide identification instrument.
Background technology
When radioactive particle was squeezed into radioactivity seeker, detector produced ionization signal.This signal has carried the various characteristic informations of nucleic, such as energy information, temporal information, positional information etc.To obtaining of ionization signal power spectrum, the domestic at present basic analog measurement method that adopts.Traditional analogue measurement technology, the filtering shaping of usually using complicated amplification wave-shaping circuit to finish the nuclear pulse processes and comparer carries out amplitude discriminator.
In the nuclear step-by-step counting was used, simple amplitude discriminator was difficult to effectively overcome the interference such as noise and base-line shift, causes larger counting error.
To the height analysis of nuclear pulse, the analogue measurement Technology Need uses complicated amplifier to finish nuclear pulse bandwidth filtering shaping and processes.Because amplifier output is the pulse of accurate Gauss shape, the energy resolution loss that causes in order to reduce ballistic deficit need to significantly add large time constant, thereby cause low pulse percent of pass.The two contradiction that is difficult to be in harmonious proportion is the difficult problem of puzzlement analogue measurement technology.
For the unconspicuous ray type of pulse height difference, adopt the comparer amplitude discriminator to be difficult to make differentiation.
In addition, mimic channel is subjected to such environmental effects large, when environment changes, is difficult to overcome temperature and floats impact with base-line shift, thereby cause the drift of location, power spectrum road, impact identification.
On the whole, adopt the spectrometer of analogue measurement technology, be difficult to overcome implacable contradiction and noise and the impact of base-line shift on measuring between energy resolution and the pulse percent of pass, its energy resolution is lower.
The utility model content
Technical problem to be solved in the utility model is: be difficult to overcome implacable contradiction between energy resolution and the pulse percent of pass for what prior art existed, a kind of digitizing γ nuclide identification instrument is provided, realize digitized measurement by probe module, ADC processing module, FPGA processing module, embedded processing module, utilize the ballistic deficit immunological characteristic of trapezoidal forming filter, better take into account energy resolution and pulse percent of pass.
The technical solution adopted in the utility model is as follows:
A kind of digitizing γ nuclide identification instrument comprises probe module, ADC processing module, FPGA processing module, embedded processing module, and described probe module output terminal is connected with the embedded processing module by ADC processing module, FPGA processing module successively.
Described probe module comprises LaBr
3Detector, charge-sensitive integrating circuit, the first amplifier circuit, described LaBr
3The detector output terminal is connected with the first amplifier circuit by the charge-sensitive integrating circuit.
Described ADC processing module comprises pole-zero cancellation circuit, ADC chip, frequency overlapped-resistable filter, and described probe module output terminal is connected with the pole-zero cancellation circuit input end, and the pole-zero cancellation circuit output end is connected with the ADC chip by frequency overlapped-resistable filter.
Described FPGA processing module is trapezoidal forming filter, and described trapezoidal forming filter is positioned between ADC processing module and the embedded processing module.
Described embedded processing module comprises microprocessor, LED display.
Described embedded processing module also comprises usb circuit, Bluetooth circuit, RS232 circuit, SD card circuit.
Described charge-sensitive integrating circuit timeconstantτ=50 μ s.
In sum, owing to having adopted technique scheme, the beneficial effects of the utility model are:
1) probe module uses LaBr
3Detector has improved output signal resolution;
2) the ADC processing module adopts the pipeline organization high-speed ADC, can directly sample to the probe module output signal, and be converted to digital signal;
3) the FPGA module is carried out trapezoidal shaping filter to the digital signal of ADC processing module output, the concrete ballistic deficit immunological characteristic of this wave filter, and can improve output signal-to-noise ratio, can take into account preferably energy resolution and pulse percent of pass;
4) the embedded processing module shows in real time by amplitude spectrum and the nuclide identification object information of display screen with the γ nucleic of measurement, also can carry out real-time communication with peripheral circuit by usb circuit, RS232 circuit, SD card circuit, Bluetooth circuit etc.
Description of drawings
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is this principle of device block diagram;
Fig. 2 is this device probe module theory diagram;
Fig. 3 is ADC processing module theory diagram;
Fig. 4 is FPGA module principle block diagram;
Fig. 5 is trapezoidal filtering shaping output waveform.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Principle of work: nuclide identification instrument is a kind of by extracting the various features of ionization signal, the instrument that nucleic is identified.It is equally divided into 1k road, 4k road, 16k road etc. to ionization signal according to different measurement demands, and (coefficient is different in the time of the net amplitude spectrum, therefore realize the different measuring demand), each location, road is measured simultaneously, can measure the pulse strength in each narrow road is wide, obtain the power spectrum of ionization signal, and according to power spectrum nucleic is identified.
This device comprises probe module, ADC processing module, FPGA module, embedded processing module
1, the probe module function is: radioactive particle enters L aBr
3The ionization signal that produces behind the detector is given the charge-sensitive integrating circuit, is translated into voltage signal, and output waveform is decline exponential pulse signal.Then by the first amplifying circuit this pulse signal is carried out gain-adjusted, send at last the ADC processing module of rear end and carry out sampling processing, wherein detector is the LaBr3 probe module, the time constant R*C=τ of charge-sensitive integrating circuit=50 μ s, the first amplifier circuit regulating impulse signal makes its amplitude reach value 100mVpp(Voltage Peak peak value), send into the ADC processing module of rear end and sample;
2, ADC processing module function is: the decline exponential pulse signal of probe module output is given the ADC processing module, converts thereof into digital signal, to carry out digital signal processing.Before sending into high-speed ADC, must nurse one's health probe output, make it satisfy the input requirements of high-speed ADC.Because ionization signal has carried out integration, introduced limit, therefore signal is through after cushioning, at first by the pole-zero cancellation circuit, eliminate the limit that the charge-sensitive integrating circuit is introduced, then carry out gain-adjusted through the second amplifying circuit, finally by crossing frequency overlapped-resistable filter, send into the ADC chip and finish sampling.Sampling output data communication device overmolding wave filter carries out the trapezoidal filtering shaping to data to be processed, and gives flush bonding processor with result.
Pole-zero cancellation circuit: eliminate the limit that the charge-sensitive integrating circuit is introduced, output pulse width is about that 2 μ s(realize by Capacitance derivative, output is about 2 μ s when using the electric capacity of 6800pf), caused overshoot when the pole-zero cancellation circuit can be regulated probe signal and carries out differential, so that baseline is got back in pulse fast, the effect of the pulse height that produces in the time of significantly improving high count rate stack is applicable to the spectrometer system of high resolving power and high count rate;
The second amplifier circuit: the regulation output range of voltage values is 0-2Vpp(during take 137Cs as reference source, and the gamma-rays amplitude adjusted that it gives off is to 440mVpp);
Frequency overlapped-resistable filter: be a low-pass filter, with the high frequency composition in the signal be limited in sample frequency 1/2 in, to avoid causing spectral aliasing.Cutoff frequency is 5MHz(f=1/2 π RC among the design, and wherein R represents resistance value.C represents capacitance);
The ADC chip: the ADC sample frequency is 40MHz.Model is AD9245;
3, the flush bonding processor module comprises flush bonding processor and peripheral circuit, LED touch-screen, usb circuit, RS232 circuit, SD card circuit and Bluetooth circuit.The flush bonding processor module is mainly finished follow-up data processing, man-machine interaction and communication function.Flush bonding processor is received the result that the FPGA signal processing module is sent here, and data are carried out classified calculating, the net amplitude spectrum.The spectrum data that flush bonding processor will synthesize are presented on the LED touch-screen, and provide nuclear spectrum recognition result and fiducial interval.By usb circuit, RS232 circuit and Bluetooth circuit, the spectrum data of storage can be sent to computing machine and be further analyzed.
Embodiment one: as shown in Figure 1, this device comprises probe module, ADC processing module, FPGA processing module, embedded processing module, and described probe module output terminal is connected with the embedded processing module by ADC processing module, FPGA processing module successively.
Embodiment two: on embodiment one basis, as shown in Figure 2, described probe module comprises LaBr
3Detector, charge-sensitive integrating circuit, the first amplifier circuit, described LaBr
3The detector output terminal is connected with the first amplifier circuit by the charge-sensitive integrating circuit.
Embodiment three: on embodiment one or 2 bases, as shown in Figure 3, described ADC processing module comprises pole-zero cancellation circuit, frequency overlapped-resistable filter, ADC chip, described probe module output terminal connects in the pole-zero cancellation circuit input end, and the pole-zero cancellation circuit output end is by between ADC chip and the frequency overlapped-resistable filter.
Embodiment four: on embodiment one, two or 3 bases, as shown in Figure 4, described FPGA processing module is trapezoidal forming filter, described trapezoidal forming filter is positioned between ADC processing module and the embedded processing module, described trapezoidal forming filter comprises totalizer, multiplier, its annexation multiplier and totalizer multi-stage cascade, as shown in Figure 4, some expression with totalizer carry out additive operation, coefficient represents to carry out multiplying with multiplier.Trapezoidal forming filter transport function such as formula (1)
Wherein,
, z is variable,
Definition see Fig. 5 for details, make convolution, tb is isosceles trapezoid pulse fall time,
Be the sampling period, if sample frequency is 40MHz, then
,
Be integration constant,
=50 μ s.
Embodiment five: on one of embodiment one to four basis, described embedded processing module comprises microprocessor, LED display.
Embodiment six: on one of embodiment one to five basis, described embedded processing module also comprises usb circuit, Bluetooth circuit, RS232 circuit, SD card circuit.
Embodiment seven: on one of embodiment one to six basis, and described charge-sensitive integrating circuit timeconstantτ=50 μ s.
Disclosed all features in this instructions except mutually exclusive feature, all can make up by any way.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
Claims (7)
1. digitizing γ nuclide identification instrument, it is characterized in that comprising probe module, ADC processing module, FPGA processing module, embedded processing module, described probe module output terminal is connected with the embedded processing module by ADC processing module, FPGA processing module successively.
2. a kind of digitizing γ nuclide identification instrument according to claim 1 is characterized in that described probe module comprises LaBr
3Detector, charge-sensitive integrating circuit, the first amplifier circuit, described LaBr
3The detector output terminal is connected with the first amplifier circuit by the charge-sensitive integrating circuit.
3. a kind of digitizing γ nuclide identification instrument according to claim 2, it is characterized in that described ADC processing module comprises pole-zero cancellation circuit, frequency overlapped-resistable filter, ADC chip, described probe module output terminal is connected with the pole-zero cancellation circuit input end, and the pole-zero cancellation circuit output end is connected with the ADC chip by frequency overlapped-resistable filter.
4. a kind of digitizing γ nuclide identification instrument according to claim 3 is characterized in that described FPGA processing module is trapezoidal forming filter, and described trapezoidal forming filter is positioned between ADC processing module and the embedded processing module.
5. a kind of digitizing γ nuclide identification instrument according to claim 4 is characterized in that described embedded processing module comprises microprocessor, LED display.
6. according to claim 1 to one of 4 described a kind of digitizing γ nuclide identification instruments, it is characterized in that described embedded processing module also comprises usb circuit, Bluetooth circuit, RS232 circuit, SD card circuit.
7. a kind of digitizing γ nuclide identification instrument according to claim 6 is characterized in that described charge-sensitive integrating circuit timeconstantτ=50 μ s.
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| CN 201220412362 CN202771001U (en) | 2012-08-20 | 2012-08-20 | Digitalized [gamma] nuclide identification instrument |
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| CN 201220412362 CN202771001U (en) | 2012-08-20 | 2012-08-20 | Digitalized [gamma] nuclide identification instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483696A (en) * | 2014-12-17 | 2015-04-01 | 北京紫方启研科技有限公司 | Digital pulse amplitude analyzer |
| CN107193037A (en) * | 2017-07-10 | 2017-09-22 | 西南科技大学 | A kind of Trace elements ONLINE RECOGNITION method |
| 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 |
| CN109599202A (en) * | 2018-11-20 | 2019-04-09 | 成都麦特斯科技有限公司 | For the composition of radiation shield, application, radiation shielding material and preparation method |
-
2012
- 2012-08-20 CN CN 201220412362 patent/CN202771001U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483696A (en) * | 2014-12-17 | 2015-04-01 | 北京紫方启研科技有限公司 | Digital pulse amplitude analyzer |
| 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 |
| CN107193037A (en) * | 2017-07-10 | 2017-09-22 | 西南科技大学 | A kind of Trace elements ONLINE RECOGNITION method |
| CN107193037B (en) * | 2017-07-10 | 2018-11-09 | 西南科技大学 | A kind of Trace elements online recognition method |
| CN109599202A (en) * | 2018-11-20 | 2019-04-09 | 成都麦特斯科技有限公司 | For the composition of radiation shield, application, radiation shielding material and preparation method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xiao Wuyun Inventor after: Liang Weiping Inventor after: Li Jinglun Inventor after: Zhang Yuzhong Inventor after: Ai Xianyun Inventor after: Ma Xinhua Inventor before: Fu Xuezhi Inventor before: Liu Siping Inventor before: Bi Chengjun Inventor before: Hu Yingrui |
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Effective date of registration: 20170124 Address after: 102205 Beijing city center Changping District Yangfang Town Street No. 37 hospital Patentee after: No. 63973 Troops of PLA Address before: 610041 Sichuan City, Chengdu province high tech Zone, Park Road, No. 1, South Road, a large incubator, building 7, block B, building 4, building two Patentee before: Chengdu MTS Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130306 Termination date: 20180820 |