CN109669206A - Circulating type liquid scintillator intelligence energy disperse spectroscopy system and its signal processing method - Google Patents
Circulating type liquid scintillator intelligence energy disperse spectroscopy system and its signal processing method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/362—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with scintillation detectors
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Abstract
A kind of circulating type liquid scintillator intelligence energy disperse spectroscopy system comprising: DC power supply management module, gamma detector module, signal-adjusting module, adc data sampling module, FPGA micro control system module, LCD display module.A kind of signal processing method of circulating type liquid scintillator intelligence energy disperse spectroscopy system, comprising: obtain the operating voltage for adapting to the different operating module of circulating type liquid scintillator intelligence energy disperse spectroscopy system；Obtain continuous pulse signal；It is filtered to by amplified signal；ADC sampling is carried out to the analog signal obtained after filtering processing and obtains digital signal；Digital signal is inputted in FPGA micro control system circuit, then being processed digital signals by FPGA micro control system can be for data that LCD display circuit is shown；Signal after the completion of processing is input to LCD display circuit by data line and shows.The operation interface of the system more optimization realizes intelligence, can effectively capture gammaphoton that energy counting rate is high.
Description
Technical field
The invention belongs to DATA REASONING fields, are related to a kind of DATA REASONING instrument, in particular to a kind of circulating type liquid dodges
Bright body intelligence energy disperse spectroscopy system and its signal processing method.
Background technique
In recent years, with the fast development of nuclear technology, nuclear technology has been widely used in such as industry, geology, medicine, has examined
The numerous areas such as Gu；Nuclear technology is also just playing increasingly important role in these areas.But in nuclear technology fast development
While, bring potential threat is also increasingly paid close attention to by people.Gamma spectrum is analyzed as a kind of substantially square of actinometry
Method is widely used in the occasions such as nuclear radiation detection, nuclide identification.The gamma-rays emitted when by decaying to radiological material
It measures, can get γ radiation amount, and the element of its radioactive substance can be obtained according to the gamma energy spectrum analysis to acquisition
The information such as type and content.And portable energy spectrometer is due to small in size, it is easy to carry, can scene use the features such as, become environment
One of the important instrument of detection and Homeland Security inspection.
The function of most of power spectrum currently on the market is all excessively single, less meets becoming for modern society's intelligent equipment
Gesture；Along with the scintillator of most of energy disperse spectroscopy all uses scintillation crystal, the form of scintillation crystal is fixed and invariable,
Therefore the detection visual field is fixed and test surface is not big enough, insufficient to the acquisition of gammaphoton；It is not quasi- enough to energy measurement accuracy rate
Really.Energy counting rate is not high enough, thus activity measure it is not accurate enough, and inhibit Compton scattering ratio (Compton
Effect, abbreviation CE) effect it is too poor；Therefore not accurate enough to the measurement of energy, accuracy is too low.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of circulating type liquid scintillator intelligence energy disperse spectroscopy system and its letters
Number processing method, operation interface more friendlyization of the circulating type liquid scintillator intelligence energy disperse spectroscopy system, function are more intelligent
Change, which has USB interface, the mass data detected can be passed through USB port
It is transferred to the computer of user；The circulating type liquid scintillator intelligence energy disperse spectroscopy system is also devised with memory function, will be each daily
The data at moment and corresponding time are transferred data on the computer of user by Wifi module, realize intelligent, office side
Just change；The circulating type liquid scintillator intelligence energy disperse spectroscopy system can effectively realize gammaphoton and capture, to energy measurement standard
True rate is most quasi-, energy counting rate (Energy counting rate, abbreviation ECR) highest, realizes that activity measures most quasi-, Ke Yiyou
Realize the effect for improving and inhibiting Compton scattering ratio in effect ground.
To achieve the above object, the present invention provides a kind of circulating type liquid scintillator intelligence energy disperse spectroscopy system, including following
Module:
DC power supply management module, for being charged by a USB interface to a battery, then to the voltage of the battery
It is managed；
Gamma detector module is obtained for realizing the detection to gammaphoton in such a way that Breakup of Liquid Ring is around shape visual angle
The energy properties of single gammaphoton detect gammaphoton using scintillation detector principle；
Signal-adjusting module comprising amplifier circuit and low-pass filter circuit, the signal-adjusting module visit gamma
The small-signal pulse for surveying the output of device module carries out signal amplification and filtering processing；
Adc data sampling module is converted into number for sampling the analog signal after signal-adjusting module
Signal is conveyed to a FPGA micro-control module and is handled；
FPGA micro-control module, for by adc data sampling module, treated that digital signal is handled, then
A LCD display module is conveyed to show or storing data or data are transferred data to user computer by wireless network；
LCD display module, the digital signal for the conveying of FPGA micro-control module to come realize that decimal data is shown；
The DC power supply management module can to gamma detector module, signal-adjusting module, adc data sampling module,
FPGA micro-control module and LCD display module provide operating voltage.
Specifically, DC power supply management module, is charged the battery by USB interface, then to the supply voltage into
Row management provides operating voltage to a kind of modules of circulating type liquid scintillator intelligence energy disperse spectroscopy；Including USB interface management
Module, supply voltage management module.
Specifically, gamma detector module, including circulating type liquid scintillation module, photoelectric conversion module.
Specifically, signal-adjusting module, signal-adjusting module includes amplifier circuit (Amplifier circuit, abbreviation
AC) and low-pass filter circuit (Low-pass filter circuit, abbreviation LPFC), gamma detector module is exported micro-
Weak signal pulse carries out signal amplification and filtering processing, and signal can be made more stable, and anti-interference is stronger, including amplifier electricity
Road module, filter circuit module；
Specifically, adc data sampling module, can sample the analog signal after signal-adjusting module, conversion
It at digital signal, is transferred to FPGA micro-control module and is handled, including AD data sampling chip module.
Specifically, FPGA micro-control module, will by adc data sampling module, treated that data-signal is handled,
LCD display module is then fed to show；The data that a kind of circulating type liquid scintillator intelligence energy disperse spectroscopy acquires can also be deposited
Storage is got off, and data can also be transferred data to user computer, including FPGA module, crystal oscillator module, number by wireless network
According to memory module, Wifi module；
Specifically, LCD display module, realizes that decimal data is shown for the data-signal that the conveying of FPGA micro-control module comes
Show, including LCD display circuit.
Further, the DC power supply management module includes:
USB interface management module, for being charged by a USB data line to battery, the USB interface management module can be incited somebody to action
Circulating type liquid scintillator intelligence energy disperse spectroscopy system acquisition to data be transferred on user computer by USB data line；
Supply voltage management module, the voltage for providing battery carry out multiple lowering and stabilizing blood pressure by voltage regulator circuit and obtain
Obtain the operating voltage of multiple disparate modules for adapting to circulating type liquid scintillator intelligence energy disperse spectroscopy system.
Specifically, USB interface management module, is under the jurisdiction of DC power supply management module, for passing through USB data line to battery
Charging realizes that the function of battery recharging gives voltage transmission to supply voltage management module, reaches environmental protection and durable function；
The module can also by circulating type liquid scintillator intelligence energy disperse spectroscopy system acquisition to data use is transferred to by USB data line
On the computer of family.
Specifically, supply voltage management module, is under the jurisdiction of DC power supply management module, the voltage that battery is provided passes through steady
Volt circuit carries out multiple lowering and stabilizing blood pressure and obtains multiple disparate modules for adapting to circulating type liquid scintillator intelligence energy disperse spectroscopy
Operating voltage.
Further, the gamma detector module includes:
Circulating type liquid scintillation module is converted into one for absorbing gammaphoton, and the energy of a gammaphoton
Cluster visible light or soft ultraviolet light photons, the circulating type liquid scintillation module include the soft shape of liquid scintillator and coil structure
Shell；
Photoelectric conversion module, for will be seen that the energy absorption of light and soft ultraviolet light photons turns by SiPM photomultiplier tube
It is melted into electric signal, then is exported by data line to signal-adjusting module.
Specifically, circulating type liquid scintillation module, is under the jurisdiction of gamma detector module, for absorbing gammaphoton, and
The energy of one gammaphoton is converted into cluster visible light or soft ultraviolet light photons, it will be seen that photon transmission gives photoelectric conversion mould
Block, by aromatic hydrocarbons liquid scintillator, the soft shape shell of coil structure is constituted.
Specifically, photoelectric conversion module, is under the jurisdiction of gamma detector module, by SiPM photomultiplier tube will be seen that light and
The energy absorption of soft ultraviolet light photons is converted to a scintillation pulse signal, then is exported by data line and give Signal Regulation mould
Block.
Further, the liquid scintillator is circulating type liquid scintillator, is mounted on the circulating type liquid scintillator
There are symmetrical four SiPM photomultiplier tubes two-by-two.
Amplifier circuit module, is under the jurisdiction of signal-adjusting module, the faint simulation electricity that gamma detector module is exported
Signal amplifies, and common-mode signal is become strong interference immunity and ADC is suitble to adopt by the amplifying circuit formed using two pieces of A/D chips
The difference analogue electric signal of egf block sampling.
Filter circuit module is under the jurisdiction of signal-adjusting module, will by low-pass filter circuit by amplified analog signal
The interference signal for not meeting desired signal requirement filters, and finally exports and samples to ADC sampling module.
Further, the adc data sampling module includes:
AD data sampling chip module, for being adopted to the differential analog signal of the formation by signal-adjusting module
Sample converts the readable digital signal of FPGA micro-control module for analog signal, while data clock and frame clock output being given
FPGA micro-control module.
Specifically, AD data sampling chip module, is under the jurisdiction of adc data sampling module, signal-adjusting module will be passed through
The differential analog signal of formation is sampled, and converts the readable digital signal of FPGA micro-control module for analog signal, simultaneously
Give data clock and frame clock output to FPGA micro-control module.
Further, the FPGA micro-control module includes:
FPGA module, at the digital signal, data clock and frame clock for exporting adc data sampling module
Reason；Finally the data handled well are exported to LCD display module；Simultaneously by the phase-locked loop structures of FPGA module to adc data
Sampling module provides data sampling clock；
Crystal oscillator module provides work clock for exporting the clock signal of generation to FPGA module for FPGA module；
Data memory module, for by circulating type liquid scintillator intelligence energy disperse spectroscopy system acquisition to data storage to depositing
In card storage, data are recorded；
Wifi module, for by circulating type liquid scintillator intelligence energy disperse spectroscopy system acquisition to the data at each moment lead to
It crosses in wireless network transmissions to the computer of user.
Wherein, FPGA module is under the jurisdiction of FPGA micro-control module, digital signal that adc data sampling module is exported, number
It is handled according to clock and frame clock；Finally the data handled well are exported to LCD display module；Pass through FPGA module simultaneously
Phase-locked loop structures provide data sampling clock to adc data sampling module.
Data memory module is under the jurisdiction of FPGA micro-control module, and a kind of circulating type liquid scintillator intelligence energy disperse spectroscopy is adopted
In the data storage to storage card collected, data are recorded.
Wifi module is under the jurisdiction of FPGA micro-control module, and circulating type liquid scintillator intelligence energy disperse spectroscopy is collected every
The data at one moment pass through in wireless network transmissions to the computer of user.
Further, the LCD display module includes:
LCD display circuit, for by data line by the energy datum that exports after the processing of FPGA micro-control module into
Row display, while can show the current electricity of entire circulating type liquid scintillator intelligence energy disperse spectroscopy system and current time.
Specifically, LCD display circuit, is under the jurisdiction of LCD display module, it will be at FPGA micro-control module by data line
The energy datum exported after reason is shown, while can show the current electricity of entire circulating type liquid scintillator intelligence energy disperse spectroscopy
With the current time.
USB interface management module is under the jurisdiction of USB interface management module, is charged by USB data line to battery, realizes electricity
The function of pond recharging gives voltage transmission to supply voltage management module, reaches environmental protection and durable function.
USB interface data transmission module is under the jurisdiction of USB interface management module, which can also dodge circulating type liquid
The bright collected data of body intelligence energy disperse spectroscopy are transferred on user computer by USB data line.
FPGA module includes fpga chip module and crystal oscillator module.Fpga chip module, is under the jurisdiction of FPGA module, by ADC
Data digital signal, data clock and the frame clock of data sampling module output are handled；It is finally that the data handled well are defeated
Out to LCD display module；When providing data sampling to adc data sampling module by the phase-locked loop structures of FPGA module simultaneously
Clock.
Crystal oscillator module is under the jurisdiction of FPGA module, and the clock signal of generation is exported to FPGA module, provides work for FPGA module
Make clock.
LCD display circuit is under the jurisdiction of LCD circuit, exports after being handled FPGA micro-control module by data line
Energy datum shown, at the same can show the current electricity of entire circulating type liquid scintillator intelligence energy disperse spectroscopy and it is current when
Between.
Display module driving circuit, is under the jurisdiction of LCD circuit, and data enter display module driving electricity from FPGA micro-control module
Road, display module driving circuit are used to drive the display of LCD display circuit.
Preferably, in a kind of above-mentioned circulating type liquid scintillator intelligence energy disperse spectroscopy, the liquid scintillator refers to
The organic solution being made of solvent and solute (scintillator), solvent are PX (paraxylene), and solute (scintillator) is PPO (2,5-
Diphenyloxazole)；The features such as paraxylene flash-point with higher, high refractive index and optical transparence.
Further, in a kind of above-mentioned circulating type liquid scintillator intelligence energy disperse spectroscopy system, the Compton dissipates
The ratio of penetrating refers to that the electron outside nucleus in Compton effect in incident photon and material atom generates inelastic collision and is scattered
Phenomenon.When collision, portion of energy is shifted electron by incident photon, and so that it is detached from atom becomes recoil electron, and scattered photon
Energy and the direction of motion change.
It can be seen from the above technical proposal that by using a kind of circulating type liquid scintillator intelligence energy disperse spectroscopy of the invention
System has more friendly operation interface, more intelligentized function；The system can effectively catch gammaphoton realization
It obtains, energy counting rate highest most quasi- to energy measurement accuracy rate, it is most quasi- to realize that activity measures, raising suppression can be effectively realized
The effect of Compton scattering ratio processed.
According to one embodiment of present invention, the system exports data by the FPGA connecting with counter.
A kind of signal processing method of circulating type liquid scintillator intelligence energy disperse spectroscopy of the present invention, comprising the following steps:
Step S1: the work electricity for the different operating module for adapting to circulating type liquid scintillator intelligence energy disperse spectroscopy system is obtained
Pressure, wherein obtain different voltage after cell voltage is carried out multiple lowering and stabilizing blood pressure processing by voltage regulator circuit, wherein each
I will be met in voltage stabilizing circuit moduleIN=IL+IG, wherein IINFor the input current of voltage regulator circuit, ILFor the output of voltage regulator circuit
Electric current, IGFor the electric current for flowing to ground terminal；
Specifically, the voltage for providing battery carries out repeatedly decompression surely by voltage regulator circuit in DC power supply management module
Pressure, which is realized, obtains multiple voltages, provides operating voltage to the modules of circulating type liquid scintillator intelligence energy disperse spectroscopy；It is wherein every
I will be met in a voltage stabilizing circuit moduleIN=IL+IG, wherein IINFor the input current of voltage regulator circuit, ILFor the defeated of voltage regulator circuit
Electric current out, IGFor the electric current for flowing to ground terminal.
Step S2: obtaining continuous pulse signal Sm,Wherein m is scintillation pulse in continuous pulse signal
Number, SiFor i-th of scintillation pulse；The amplitude of Sm is Em, frequency fm；
Specifically, deriving gammaphoton when the ionising radiation of gamma ray collides in gamma detector, gal is generated
Horse photon injects liquid scintillator and the loss of energy in liquid scintillator, causes the ionization and excitation that flash atom, is stimulated
Electrons inspire visible light；Photon is beaten occurs photoelectric effect generation photoelectron, photoelectron warp on photomultiplier tube photocathode
Multiplication, last electronics in photomultiplier tube is crossed to export to form scintillation pulse through positive grade；Last shape occurs for multiple continuous scintillation pulses
At a continuous pulse signal Sm,Wherein m is the number of scintillation pulse in continuous pulse signal, SiIt is i-th
A scintillation pulse；The amplitude of Sm is Em, frequency fm。
Step S3: processing is amplified to continuous impulse signal, wherein pass through the amplifier circuit in circuit for signal conditioning
Signal is amplified, and uses in-phase proportion amplifying circuit, input signal and output signal meetIts
Middle uoFor output signal, uIFor input signal, RfFor feedback resistance, R is compensation resistance.The amplification factor of the circuit
Specifically, continuous impulse signal entering signal adjusts the amplifier circuit in circuit, faint signal is zoomed into
The signal of one strong interference immunity, and in-phase proportion amplifying circuit is used, input signal and output signal meetWherein uoFor output signal, uIFor input signal, RfFor feedback resistance, R is compensation resistance.The circuit
Amplification factor
Step S4: it is filtered to by amplified signal, wherein by a second order active low-pass filtering electricity
Road filters the interference signal of generation, and the cutoff frequency of low-pass filter circuit is Wherein R1、R2Point
Not Wei filter resistance in filter circuit in the first rank and second-order, C1、C2First rank and second respectively in filter circuit
Filter capacitor in rank；
Specifically, the interference signal of generation is filtered by a second order active low-pass filter circuit by amplified signal
Fall；The cutoff frequency of low-pass filter circuit isWherein R1、R2Respectively first in filter circuit
Filter resistance in rank and second-order, C1、C2Filter capacitor respectively in filter circuit in the first rank and second-order；This two
The cutoff frequency of rank active low-pass filter circuit is not only determined by resistance and capacitor, also related with the bandwidth of amplifier.
Step S5: ADC sampling is carried out to the analog signal obtained after filtering processing and obtains digital signal, data sampling is full
Sufficient fs≥2fm, wherein fsFor sample frequency, fmFor the signal frequency of analog signal；
And digital-to-analogue conversion meetsWherein N is metric digital signal, AVDDFor number
Reference voltage, SmFor analog signal；
Specifically, signal forms a stable analog signal after circuit for signal conditioning module, then by adc data
Sampling module sampling, sampling form a digital signal later；Data sampling must satisfy fs≥2fm, arteries and veins will not be just generated in this way
The phenomenon that punching accumulation；Wherein fsFor sample frequency, fmFor the signal frequency of analog signal；
And digital-to-analogue conversion meetsWherein N is metric digital signal, AVDDFor number
Reference voltage, SmFor analog signal.
Step S6: digital signal is inputted in FPGA micro control system circuit, then will be digital by FPGA micro control system
Signal processing is at can be for data that LCD display circuit is shown；Signal after the completion of processing is input to LCD by data line and shows
Show that circuit is shown.
Further, in the step S1, a higher DC voltage can be passed through the pressure stabilizing of selected voltage stabilizing chip
DC voltage needed for formation one oneself after decompression.
Further, the method for continuous pulse signal is obtained are as follows: when the ionising radiation of gamma ray is spread out colliding
Gammaphoton is born, gammaphoton is generated and injects liquid scintillator and the loss of energy in liquid scintillator, causes to flash atom
Ionization and excitation, the electrons that are stimulated inspire visible light；Photon, which is beaten, occurs photoelectric effect on photomultiplier tube photocathode
Photoelectron is generated, photoelectron is exported by multiplication, last electronics in photomultiplier tube through positive grade, forms a scintillation pulse letter
Number.
A specific embodiment according to the present invention, the amplitude range of scintillation pulse are 0-500 millivolts, and ADC is 10 essences
It spends and dynamic range is between 0-1500 millivolts, the LSB=210/1500 of the ADC, utilizes the above method and device mould at this time
The step of number conversion (analog to digital conversion, abbreviation ADC), is as follows:
Step S1: the dynamic range of ADC is arranged between 0-1500 millivolts.
Step S2: the sampling clock of a f=150MHz is connected to ADC chip；
8 data of the every conversion of step S3:ADC chip begin to the conversion of next analog signal；
A specific embodiment according to the present invention, the amplifier circuit utilize two integrated operational amplifier groups
At a differential amplifier circuit, common-mode signal is become into a pair of of difference mode signal and then carries out signal amplification.
A specific embodiment according to the present invention, the method for the lowering and stabilizing blood pressure, by a higher DC voltage
DC voltage needed for formation one oneself after pressure stabilizing decompression by selecting voltage stabilizing chip.
A specific embodiment according to the present invention, the method for the generation scintillation pulse, when the ionization of gamma ray
Radiation derives gammaphoton colliding, and generates gammaphoton and injects liquid scintillator energy is simultaneously lost in liquid scintillator
Amount, causes the ionization and excitation that flash atom, and the electrons that are stimulated inspire visible light；Photon is beaten in photomultiplier tube photocathode
Upper generation photoelectric effect generates photoelectron, and photoelectron is exported by multiplication, last electronics in photomultiplier tube through positive grade, forms one
A scintillation pulse signal.
A specific embodiment according to the present invention；A kind of base of the circulating type liquid scintillator intelligence energy disperse spectroscopy
Model；Primary structure is gamma detector, processor machine box (FPGA processor, AD analog to digital conversion circuit, circuit for signal conditioning)
And computer system；Gamma detector shape is radius r=20cm, the cylinder barrel of the stainless steel material of high h=50cm；And it uses
The technology of protected type；Equipped with the liquid scintillator around shape in cylinder barrel, on the liquid scintillator of shape and mount
SiPM photomultiplier tube.A long a=15cm, width b=10cm, high h1=10cm rectangle three-dimensional screen are installed under gamma detector
The machine box of formula is covered, FPGA processor, AD analog to digital conversion circuit and circuit for signal conditioning are installed in machine box；Machine box picks out All-in-One
Shielding data line be connected on the PC host of computer system, have energy datum in the shielding data line of the All-in-One
The data such as data line and host computer line wire wrapping is together；PC host again shows data to liquid crystal display.
Corresponding experiment measurement is carried out using the said goods,137Under the source Cs, the gamma sensitivity that measures be greater than
2100CPS/(u Sv.H-1), the index of the above sensitivity is at the level before examination, Radionuclide analysis in same quasi-instrument
It is no more than 100 seconds in background, spectrum stabilization is carried out by natural nuclide.It may be said that gamma spectrometer of the invention success simultaneously
The features such as realizing natural nuclide spectrum stabilization, high sensitivity.
Compared with prior art, the beneficial effects of the present invention are:
(1) more friendly operation interface, more intelligentized function；
(2) more effectively gammaphoton is realized and is captured；
(3) accuracy rate is more accurately measured；
(4) higher energy counting rate；
(5) activity is more accurately measured；
(6) it more effectively realizes and inhibits Compton scattering ratio；
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, be described below in it is for the present invention
Attached drawing is only some embodiments of the present invention, for those of ordinary skill in the art, what is do not made the creative labor
Under the premise of, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural block diagram of circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention.
Fig. 2 is that the hardware module of circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention connects block diagram.
Fig. 3 is the hardware module block diagram of the gamma detector of circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention.
Fig. 4 is that the signal of circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention is exported from detector by each mould
The flow diagram of block.
Fig. 5 is the AD data sampling module and FPGA microcontroller of circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention
The signal of module transmits block diagram.
Fig. 6 is that the data processing of FPGA micro-control module, data storage and data export block diagram.
Fig. 7 is a kind of PM prototype model figure of circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention.
Wherein 1-SiPM, 2-SiPM, 3-SiPM, 4-SiPM, 5- circulating type liquid scintillator, 6- tube socket, 7- support base,
8- pin, 9- computer processing system, 10- display screen, 11-PC host, 12- data line, 13- gamma detector, 14- branch
Support bracket base, 15- composite module.
Specific embodiment
The invention discloses a kind of circulating type liquid scintillator intelligence energy disperse spectroscopy system, which has more friendly behaviour
Make interface, more intelligentized function；The system effectively can realize capture to gammaphoton, most to energy measurement accuracy rate
It is most quasi- to realize that activity measures, can effectively realize the effect for improving and inhibiting Compton scattering ratio for standard, energy counting rate highest
Fruit.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention is retouched in detail
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, those of ordinary skill in the art's every other implementation obtained without making creative work
Example, shall fall within the protection scope of the present invention.
As shown in Figure 1, circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention, captures gal by gamma detector
Horse ray simultaneously becomes optical photon and is then converted into electric pulse analog signal, and electric pulse analog signal samples mould by adc data
Block becomes digital signal, is output to the processing of FPGA micro-control module, finally exports and show power spectrum and counting rate to LCD module.
Circulating type liquid scintillator intelligence energy disperse spectroscopy system specifically includes: DC power supply management module 100, gamma detector module 200,
Signal-adjusting module 300, adc data sampling module 400, FPGA micro-control module 500, LCD display module 600.Wherein,
As shown in Fig. 1 and Fig. 4, DC power supply management module 100 is charged the battery by USB interface, then to this
Supply voltage is managed, and provides operating voltage to a kind of modules of circulating type liquid scintillator intelligence energy disperse spectroscopy, i.e., directly
Flow power management module 100 can give gamma detector module 200, signal-adjusting module 300, adc data sampling module 400,
FPGA micro-control module 500 and LCD display module 600 provide operating voltage.DC power supply management module 100 includes USB interface
Management module 110, supply voltage management module 120.USB interface management module 110, for passing through a USB data line to battery
Charging, the USB interface management module can by circulating type liquid scintillator intelligence energy disperse spectroscopy system acquisition to data pass through USB
Data line is transferred on user computer.Supply voltage management module 120, voltage for providing battery by voltage regulator circuit into
The multiple lowering and stabilizing blood pressure of row and the work for obtaining multiple disparate modules for adapting to circulating type liquid scintillator intelligence energy disperse spectroscopy system
Voltage.USB interface management module 110 includes USB charge management module 111 and USB data transmission module 112.
As shown in Figure 1, gamma detector module 200, is realized in such a way that Breakup of Liquid Ring is around shape visual angle to gammaphoton
Detection, obtains the energy properties of single gammaphoton, detects gammaphoton using scintillation detector principle.Gamma detector module
200 include circulating type liquid scintillation module 210, and photoelectric conversion module, in one embodiment, photoelectric conversion module 220 is
Silicon photomultiplier (SiPM).Circulating type liquid scintillation module 210, for absorbing gammaphoton, and a gammaphoton
Energy be converted into cluster visible light or soft ultraviolet light photons, the circulating type liquid scintillation module include liquid scintillator and
The soft shape shell of coil structure.Photoelectric conversion module 220, for will be seen that light and soft ultraviolet light light by SiPM photomultiplier tube
The energy absorption of son is converted to electric signal, then is exported by data line to signal-adjusting module.
The liquid scintillator is circulating type liquid scintillator, is pasted on the circulating type liquid scintillator symmetrical two-by-two
Four SiPM photomultiplier tubes.
As shown in Figure 1, signal-adjusting module 300, signal-adjusting module includes amplifier circuit and low-pass filter circuit, is incited somebody to action
The small-signal pulse of gamma detector module output carries out signal amplification and filtering processing, and signal can be made more stable, resists
Interference is stronger.Signal-adjusting module 300 includes amplifier circuit module 310, filter circuit module 320.
As shown in Figure 1, adc data sampling module 400, can adopt the analog signal after signal-adjusting module
Sample is converted into digital signal, is conveyed to FPGA micro-control module 500 and is handled.Adc data sampling module 400 includes ADC number
According to sampling A/D chip module 410.Adc data sampling A/D chip module, for the difference analogue to the formation by signal-adjusting module
Signal is sampled, and converts the readable digital signal of FPGA micro-control module for analog signal, while by data clock and frame
Clock output gives FPGA micro-control module.
It, will treated that digital signal carries out by adc data sampling module as shown in Figure 1, FPGA micro-control module 500
Processing, is then fed to LCD display module and shows；The data that circulating type liquid scintillator intelligence energy disperse spectroscopy acquires can also be deposited
Storage is got off, and data can be transferred data to user computer by wireless network.FPGA micro-control module 500 includes FPGA
Module 510, crystal oscillator module 512, data memory module 520, Wifi module 530.FPGA module 510, for sampling adc data
Digital signal, data clock and the frame clock of module output are handled；Finally the data handled well are exported and show mould to LCD
Block；Data sampling clock is provided to adc data sampling module by the phase-locked loop structures of FPGA module simultaneously.Crystal oscillator module 512,
For exporting the clock signal of generation to FPGA module, work clock is provided for FPGA module.Data memory module 520 is used
In the data storage to storage card for arriving circulating type liquid scintillator intelligence energy disperse spectroscopy system acquisition, data are recorded.
Wifi module 530, the number at each moment for arriving circulating type liquid scintillator intelligence energy disperse spectroscopy system acquisition
According to by wireless network transmissions to the computer of user.
The data-signal that the conveying of FPGA micro-control module comes is realized that decimal data is shown by LCD display module 600.
LCD display module 600 includes LCD display circuit 610.LCD display circuit 610, for passing through data line for FPGA micro-control
The energy datum exported after resume module processed is shown, while can show entire circulating type liquid scintillator intelligence energy disperse spectroscopy system
The electricity for uniting current and current time.LCD display circuit 610 includes display module drive circuit module 611 and LCD display
612。
USB interface management module 110 is under the jurisdiction of DC power supply management module 100, for passing through USB data line to battery
Voltage transmission to supply voltage management module 120, is reached environmental protection and durable function by charging, the function of realization battery recharging
Energy；The collected data of circulating type liquid scintillator intelligence energy disperse spectroscopy can also be transferred to use by USB data line by the module
On the computer of family.
Supply voltage management module 120 is under the jurisdiction of DC power supply management module 100, and the 9V voltage that battery provides is passed through
Voltage regulator circuit carries out multiple lowering and stabilizing blood pressure and realizes acquisition 5V, 3.3V,2.5V and 1.The more a voltages of 0V are dodged to a kind of circulating type liquid
The modules of bright body intelligence energy disperse spectroscopy provide operating voltage.
Circulating type liquid scintillation module 210, is under the jurisdiction of gamma detector module 200, for absorbing gammaphoton, and handle
The energy of one gammaphoton is converted into cluster visible light or soft ultraviolet light photons, it will be seen that photon transmission is to photoelectric conversion module
220, by the aromatic hydrocarbons liquid scintillator of benzene ring structure, the soft shape shell of coil structure is constituted.
Photoelectric conversion module 220 is under the jurisdiction of gamma detector module 200, by SiPM photomultiplier tube will be seen that light and
The energy absorption of soft ultraviolet light photons is converted to a scintillation pulse signal, then is exported by data line and give Signal Regulation mould
Block 300.
Amplifier circuit module 310 is under the jurisdiction of signal-adjusting module 300, gamma detector module is exported faint
Analog electrical signal amplifies, using two pieces of AD8039 chips form amplifying circuit by common-mode signal become strong interference immunity and
It is suitble to the difference analogue electric signal of ADC sampling module sampling.
Filter circuit module 320 is under the jurisdiction of signal-adjusting module 300, and amplified analog signal is passed through low-pass filtering
Circuit filters the interference signal for not meeting desired signal requirement, finally exports and samples to ADC sampling module.
AD data sampling chip module 410, is under the jurisdiction of adc data sampling module 400, will pass through the shape of signal-adjusting module
At differential analog signal sampled, convert the readable digital signal of FPGA micro-control module for analog signal, simultaneously will
Data clock and frame clock output are to FPGA micro-control module 500.
FPGA module 510 is under the jurisdiction of FPGA micro-control module 500, and the data digital that adc data sampling module is exported is believed
Number, data clock and frame clock handled；Finally the data handled well are exported to LCD display module 600；Pass through simultaneously
The phase-locked loop structures of FPGA module provide data sampling clock to adc data sampling module.FPGA module 510 includes fpga chip
Module 511 and crystal oscillator module 512.
Crystal oscillator module 512 is under the jurisdiction of FPGA module 510, and it is FPGA that the clock signal of generation, which is exported to FPGA module 510,
Module 510 provides work clock.
Data memory module 520 is under the jurisdiction of FPGA micro-control module 500, by circulating type liquid scintillator intelligence energy disperse spectroscopy
In collected data storage to storage card, data are recorded.
Wifi module 530 is under the jurisdiction of FPGA microcontroller
FPGA micro-control module 500 leads to the data at circulating type liquid scintillator intelligence energy disperse spectroscopy collected each moment
It crosses in wireless network transmissions to the computer of user.
LCD display circuit 610 is under the jurisdiction of LCD display module 600, will be at FPGA micro-control module by data line
The energy datum exported after reason is shown, while can show the current electricity of entire circulating type liquid scintillator intelligence energy disperse spectroscopy
With the current time.
In above circulating type liquid scintillator intelligence energy disperse spectroscopy system, the liquid scintillator refers to by solvent and molten
The organic solution of matter (scintillator) composition, solvent are PX (paraxylene), and solute (scintillator) is that PPO (dislike by 2,5- diphenyl
Azoles)；The features such as paraxylene flash-point with higher, high refractive index and optical transparence.
In above circulating type liquid scintillator intelligence energy disperse spectroscopy system, the Compton scattering ratio refers to Compton
The phenomenon that electron outside nucleus in effect in incident photon and material atom generates inelastic collision and is scattered.It is incident when collision
Portion of energy is shifted electron by photon, and so that it is detached from atom becomes recoil electron, and the energy of scattered photon and the direction of motion
It changes.
As shown in Fig. 3 and Fig. 7, Fig. 3 is the gamma detector of circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention
Structural block diagram, Fig. 6 be the data processing of FPGA micro-control module, data storage and data export block diagram.Hardware module includes silicon
Photomultiplier tube (SiPM) 1,2,3,4, circulating type liquid scintillator 5, tube socket 6, support base 7, pin 8, computer disposal system
System 9, display screen 10, PC host 11, data line 12, gamma detector 13, supporting support pedestal 14, composite module 15, group
Molding block 15 includes FPGA processor, AD analog-to-digital conversion, circuit for signal conditioning.
As shown in Fig. 2, the hardware module that Fig. 2 is circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention connects frame
Figure.As shown in figure 5, Fig. 5 is the AD data sampling module and FPGA of circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention
The signal of micro-control module transmits block diagram；As shown in fig. 6, Fig. 6 is the data processing of FPGA micro-control module, data storage and data
Export block diagram.
By several specific embodiments, circulating type liquid scintillator intelligence energy disperse spectroscopy system of the present invention is done and is further retouched
It states.Circulating type liquid scintillator intelligence energy disperse spectroscopy system proposed by the present invention, the set division being related to, function deriving mode
And its priority orders, coded system, threshold parameter needs were adjusted to reach enough according to the characteristics of fetched data
Statistic property.The parameter of the processing data of Application Example involved in listing herein.
In one embodiment,
The power supply used in DC power supply management module 100 for can recharging lithium battery, maximum voltage value 9V；
The scintillator used in gamma detector module 200 is around the liquid scintillator of shape；
The operational amplifier chip used in signal-adjusting module 300 is the AD8039 of patch type；
The ADC modulus conversion chip used in adc data sampling module 400 is the AD9287 of patch type；
Processor uses FPGA (field programmable gate array) processor in FPGA micro-control module 500；
Display screen is using OLED12684 in LCD display module 600.
A kind of signal processing method of circulating type liquid scintillator intelligence energy disperse spectroscopy of the present invention, comprising the following steps:
Step S1: the work electricity for the different operating module for adapting to circulating type liquid scintillator intelligence energy disperse spectroscopy system is obtained
Pressure, wherein obtain different voltage after cell voltage is carried out multiple lowering and stabilizing blood pressure processing by voltage regulator circuit, wherein each
I will be met in voltage stabilizing circuit moduleIN=IL+IG, wherein IINFor the input current of voltage regulator circuit, ILFor the output of voltage regulator circuit
Electric current, IGFor the electric current for flowing to ground terminal；
Specifically, the voltage for providing battery carries out repeatedly decompression surely by voltage regulator circuit in DC power supply management module
Pressure, which is realized, obtains multiple voltages, provides operating voltage to the modules of circulating type liquid scintillator intelligence energy disperse spectroscopy；It is wherein every
I will be met in a voltage stabilizing circuit moduleIN=IL+IG, wherein IINFor the input current of voltage regulator circuit, ILFor the defeated of voltage regulator circuit
Electric current out, IGFor the electric current for flowing to ground terminal.
Step S2: obtaining continuous pulse signal Sm,Wherein m is scintillation pulse in continuous pulse signal
Number, SiFor i-th of scintillation pulse；The amplitude of Sm is Em, frequency fm；
Specifically, deriving gammaphoton when the ionising radiation of gamma ray collides in gamma detector, gal is generated
Horse photon injects liquid scintillator and the loss of energy in liquid scintillator, causes the ionization and excitation that flash atom, is stimulated
Electrons inspire visible light；Photon is beaten occurs photoelectric effect generation photoelectron, photoelectron warp on photomultiplier tube photocathode
Multiplication, last electronics in photomultiplier tube is crossed to export to form scintillation pulse through positive grade；Last shape occurs for multiple continuous scintillation pulses
At a continuous pulse signal Sm,Wherein m is the number of scintillation pulse in continuous pulse signal, SiIt is i-th
A scintillation pulse；The amplitude of Sm is Em, frequency fm。
Step S3: processing is amplified to continuous impulse signal, wherein pass through the amplifier circuit in circuit for signal conditioning
Signal is amplified, and uses in-phase proportion amplifying circuit, input signal and output signal meetIts
Middle uoFor output signal, uIFor input signal, RfFor feedback resistance, R is compensation resistance.The amplification factor of the circuit
Specifically, continuous impulse signal entering signal adjusts the amplifier circuit in circuit, faint signal is zoomed into
The signal of one strong interference immunity, and in-phase proportion amplifying circuit is used, input signal and output signal meetWherein uoFor output signal, uIFor input signal, RfFor feedback resistance, R is compensation resistance.The circuit
Amplification factor
Step S4: it is filtered to by amplified signal, wherein by a second order active low-pass filtering electricity
Road filters the interference signal of generation, and the cutoff frequency of low-pass filter circuit is Wherein R1、R2Point
Not Wei filter resistance in filter circuit in the first rank and second-order, C1、C2First rank and second respectively in filter circuit
Filter capacitor in rank；
Specifically, the interference signal of generation is filtered by a second order active low-pass filter circuit by amplified signal
Fall；The cutoff frequency of low-pass filter circuit isWherein R1、R2Respectively first in filter circuit
Filter resistance in rank and second-order, C1、C2Filter capacitor respectively in filter circuit in the first rank and second-order；This two
The cutoff frequency of rank active low-pass filter circuit is not only determined by resistance and capacitor, also related with the bandwidth of amplifier.
Step S5: ADC sampling is carried out to the analog signal obtained after filtering processing and obtains digital signal, data sampling is full
Sufficient fs≥2fm, wherein fsFor sample frequency, fmFor the signal frequency of analog signal；
And digital-to-analogue conversion meetsWherein N is metric digital signal, AVDDFor number
Reference voltage, SmFor analog signal；
Specifically, signal forms a stable analog signal after circuit for signal conditioning module, then by adc data
Sampling module sampling, sampling form a digital signal later；Data sampling must satisfy fs≥2fm, arteries and veins will not be just generated in this way
The phenomenon that punching accumulation；Wherein fsFor sample frequency, fmFor the signal frequency of analog signal；
And digital-to-analogue conversion meetsWherein N is metric digital signal, AVDDFor number
Reference voltage, SmFor analog signal.
Step S6: digital signal is inputted in FPGA micro control system circuit, then will be digital by FPGA micro control system
Signal processing is at can be for data that LCD display circuit is shown；Signal after the completion of processing is input to LCD by data line and shows
Show that circuit is shown.
Further, in the step S1, a higher DC voltage can be passed through the pressure stabilizing of selected voltage stabilizing chip
DC voltage needed for formation one oneself after decompression.
Further, the method for continuous pulse signal is obtained are as follows: when the ionising radiation of gamma ray is spread out colliding
Gammaphoton is born, gammaphoton is generated and injects liquid scintillator and the loss of energy in liquid scintillator, causes to flash atom
Ionization and excitation, the electrons that are stimulated inspire visible light；Photon, which is beaten, occurs photoelectric effect on photomultiplier tube photocathode
Photoelectron is generated, photoelectron is exported by multiplication, last electronics in photomultiplier tube through positive grade, forms a scintillation pulse letter
Number.
A specific embodiment according to the present invention, the amplitude range of scintillation pulse are 0-500 millivolts, and ADC is 10 essences
It spends and dynamic range is between 0-1500 millivolts, the LSB=210/1500 of the ADC, utilizes the above method and device mould at this time
The step of number conversion (analog to digital conversion, abbreviation ADC), is as follows:
Step S1: the dynamic range of ADC is arranged between 0-1500 millivolts.
Step S2: the sampling clock of a f=150MHz is connected to ADC chip；
8 data of the every conversion of step S3:ADC chip begin to the conversion of next analog signal；
A specific embodiment according to the present invention, the amplifier circuit utilize two integrated operational amplifier groups
At a differential amplifier circuit, common-mode signal is become into a pair of of difference mode signal and then carries out signal amplification.
A specific embodiment according to the present invention, the method for the lowering and stabilizing blood pressure, by a higher DC voltage
DC voltage needed for formation one oneself after pressure stabilizing decompression by selecting voltage stabilizing chip.
A specific embodiment according to the present invention, the method for the generation scintillation pulse, when the ionization of gamma ray
Radiation derives gammaphoton colliding, and generates gammaphoton and injects liquid scintillator energy is simultaneously lost in liquid scintillator
Amount, causes the ionization and excitation that flash atom, and the electrons that are stimulated inspire visible light；Photon is beaten in photomultiplier tube photocathode
Upper generation photoelectric effect generates photoelectron, and photoelectron is exported by multiplication, last electronics in photomultiplier tube through positive grade, forms one
A scintillation pulse signal.
A specific embodiment according to the present invention；The base mould of the circulating type liquid scintillator intelligence energy disperse spectroscopy system
Type primary structure is gamma detector, processor machine box (FPGA processor, AD analog to digital conversion circuit, circuit for signal conditioning) and meter
Calculation machine system；Gamma detector shape is radius r=20cm, the cylinder barrel of the stainless steel material of high h=50cm；And use screen
Cover the technology of formula；Equipped with the liquid scintillator around shape in cylinder barrel, on the liquid scintillator of shape and upper SiPM light is mounted
Electric multiplier tube.A long a=15cm, width b=10cm, high h1=10cm rectangle bulk shield formula are installed under gamma detector
Machine box is equipped with FPGA processor, AD analog to digital conversion circuit and circuit for signal conditioning in machine box；Machine box picks out the shielding of All-in-One
Data line is connected on the PC host of computer system, has energy datum data line in the shielding data line of the All-in-One
Together with the data wire wrapping such as host computer line；PC host again shows data to liquid crystal display.
Corresponding experiment measurement is carried out using the said goods,137Under the source Cs, the gamma sensitivity that measures be greater than
2100CPS/(u Sv.H-1), the index of the above sensitivity is at the level before examination, Radionuclide analysis in same quasi-instrument
It is no more than 100 seconds in background, spectrum stabilization is carried out by natural nuclide.It may be said that gamma spectrometer of the invention success simultaneously
The features such as realizing natural nuclide spectrum stabilization, high sensitivity.
By comparison as can be seen that using circulating type liquid scintillator intelligence energy disperse spectroscopy system of the invention, system tool
There are more friendly operation interface, more intelligentized function；The system can effectively realize gammaphoton and capture, to energy
It is most quasi- to measure accuracy rate, it is most quasi- to realize that activity measures for energy counting rate highest, can effectively realize raising and Compton is inhibited to dissipate
Penetrate the effect of ratio.
Compared with prior art, the beneficial effects of the present invention are:
(1) more friendly operation interface, more intelligentized function；
(2) more effectively gammaphoton is realized and is captured；
(3) accuracy rate is more accurately measured；
(4) higher energy counting rate；
(5) more accurate energy activity；
(6) it more effectively realizes and inhibits Compton scattering ratio.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (10)
1. a kind of circulating type liquid scintillator intelligence energy disperse spectroscopy system, it is characterised in that: comprise the following modules:
DC power supply management module (100), for being charged by a USB interface to a battery, then to the electricity of the battery
Pressure is managed；
Gamma detector module (200) is obtained for realizing the detection to gammaphoton in such a way that Breakup of Liquid Ring is around shape visual angle
The energy properties of single gammaphoton detect gammaphoton using scintillation detector principle；
Signal-adjusting module (300) comprising amplifier circuit and low-pass filter circuit, the signal-adjusting module (300) will
The small-signal pulse of gamma detector module output carries out signal amplification and filtering processing；
Adc data sampling module (400) is converted into counting for sampling the analog signal after signal-adjusting module
Word signal is conveyed to a FPGA micro-control module (500) and is handled；
FPGA micro-control module (500), for by adc data sampling module, treated that digital signal is handled, so
After be conveyed to a LCD display module (600) display or storing data or data transferred data into user by wireless network
Computer；
LCD display module (600), the digital signal for FPGA micro-control module (500) conveying to come realize decimal number
According to display；
The DC power supply management module (100) can give gamma detector module (200), signal-adjusting module (300), ADC number
Operating voltage is provided according to sampling module (400), FPGA micro-control module (500) and LCD display module (600).
2. circulating type liquid scintillator intelligence energy disperse spectroscopy system according to claim 1, which is characterized in that the direct current
Source control module includes:
USB interface management module, for being charged by a USB data line to battery, the USB interface management module can will be surround
Formula liquid scintillator intelligence energy disperse spectroscopy system acquisition to data be transferred on user computer by USB data line；
Supply voltage management module, voltage for providing battery by voltage regulator circuit carry out multiple lowering and stabilizing blood pressure obtain it is more
The operating voltage of a disparate modules for adapting to circulating type liquid scintillator intelligence energy disperse spectroscopy system.
3. circulating type liquid scintillator intelligence energy disperse spectroscopy system according to claim 1, which is characterized in that the gamma is visited
Surveying device module includes:
Circulating type liquid scintillation module, for absorbing gammaphoton, and the energy of a gammaphoton is converted into cluster can
Light-exposed or soft ultraviolet light photons, the circulating type liquid scintillation module include outside liquid scintillator and the soft shape of coil structure
Shell；
Photoelectric conversion module, for will be seen that light and the energy absorption of soft ultraviolet light photons are converted to by SiPM photomultiplier tube
Electric signal, then exported by data line to signal-adjusting module.
4. circulating type liquid scintillator intelligence energy disperse spectroscopy system according to claim 3, which is characterized in that the liquid dodges
Bright body is circulating type liquid scintillator, and symmetrical four SiPM photomultiplier transits two-by-two are pasted on the circulating type liquid scintillator
Pipe.
5. circulating type liquid scintillator intelligence energy disperse spectroscopy system according to claim 1, it is characterised in that the adc data
Sampling module includes:
Adc data sampling A/D chip module will for sampling to the differential analog signal of the formation by signal-adjusting module
Analog signal is converted into the readable digital signal of FPGA micro-control module, while data clock and frame clock output is micro- to FPGA
Control module.
6. circulating type liquid scintillator intelligence energy disperse spectroscopy system according to claim 1, which is characterized in that the FPGA is micro-
Control module includes:
FPGA module, digital signal, data clock and frame clock for exporting adc data sampling module are handled；Most
The data handled well are exported to LCD display module afterwards；Mould is sampled to adc data by the phase-locked loop structures of FPGA module simultaneously
Block provides data sampling clock；
Crystal oscillator module provides work clock for exporting the clock signal of generation to FPGA module for FPGA module；
Data memory module, the data for arriving circulating type liquid scintillator intelligence energy disperse spectroscopy system acquisition are stored to storage card
In, record data；
Wifi module, for by circulating type liquid scintillator intelligence energy disperse spectroscopy system acquisition to the data at each moment pass through nothing
Gauze network is transferred on the computer of user.
7. circulating type liquid scintillator intelligence energy disperse spectroscopy system according to claim 1, which is characterized in that the LCD is aobvious
Show that module includes:
LCD display circuit, for being shown the energy datum exported after the processing of FPGA micro-control module by data line
Show, while can show the current electricity of entire circulating type liquid scintillator intelligence energy disperse spectroscopy system and current time.
8. a kind of signal processing method of circulating type liquid scintillator intelligence energy disperse spectroscopy system, which is characterized in that the method packet
Include following steps:
Step S1: obtaining the operating voltage for adapting to the different operating module of circulating type liquid scintillator intelligence energy disperse spectroscopy system,
Wherein, different voltage is obtained after cell voltage being carried out multiple lowering and stabilizing blood pressure processing by voltage regulator circuit, wherein each pressure stabilizing
I will be met in circuit moduleIN=IL+IG, wherein IINFor the input current of voltage regulator circuit, ILFor the output electricity of voltage regulator circuit
Stream, IGFor the electric current for flowing to ground terminal；
Step S2: obtaining continuous pulse signal Sm,Wherein m is of scintillation pulse in continuous pulse signal
Number, SiFor i-th of scintillation pulse；The amplitude of Sm is Em, frequency fm；
Step S3: processing is amplified to continuous impulse signal, wherein by the amplifier circuit in circuit for signal conditioning to letter
It number amplifies, and uses in-phase proportion amplifying circuit, input signal and output signal meetWherein uo
For output signal, uIFor input signal, RfFor feedback resistance, R is compensation resistance.The amplification factor of the circuit
Step S4: it is filtered to by amplified signal, wherein will by a second order active low-pass filter circuit
The interference signal of generation filters, and the cutoff frequency of low-pass filter circuit is Wherein R1、R2Respectively filter
Filter resistance in wave device circuit in the first rank and second-order, C1、C2Respectively in filter circuit in the first rank and second-order
Filter capacitor；
Step S5: ADC sampling is carried out to the analog signal obtained after filtering processing and obtains digital signal, data sampling meets fs
≥2fm, wherein fsFor sample frequency, fmFor the signal frequency of analog signal；
And digital-to-analogue conversion meetsWherein N is metric digital signal, AVDDFor digital reference
Voltage, SmFor analog signal；
Step S6: digital signal is inputted in FPGA micro control system circuit, then by FPGA micro control system by digital signal
Being processed into can be for data that LCD display circuit is shown；Signal after the completion of processing is input to LCD display electricity by data line
Road is shown.
9. the signal processing method of circulating type liquid scintillator intelligence energy disperse spectroscopy system according to claim 8, feature
It is, it in the step S1, can be by a higher DC voltage by forming one after selecting the pressure stabilizing decompression of voltage stabilizing chip
A DC voltage needed for oneself.
10. the signal processing method of circulating type liquid scintillator intelligence energy disperse spectroscopy system according to claim 8, feature
It is, the method for obtaining continuous pulse signal are as follows: when the ionising radiation of gamma ray derives gammaphoton colliding,
It generates gammaphoton and injects liquid scintillator and the loss of energy in liquid scintillator, cause the ionization and excitation that flash atom,
The electrons that are stimulated inspire visible light；Photon is beaten occurs photoelectric effect generation photoelectron, light on photomultiplier tube photocathode
Electronics is exported by multiplication, last electronics in photomultiplier tube through positive grade, forms a scintillation pulse signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910158126.4A CN109669206A (en) | 2019-03-03 | 2019-03-03 | Circulating type liquid scintillator intelligence energy disperse spectroscopy system and its signal processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN114839662A (en) * | 2022-05-16 | 2022-08-02 | 哈尔滨工程大学 | Wide-range gamma dosimeter |
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