CN106959462B - A kind of processing method of personal dosimeter's vibration proof and electromagnetic interference - Google Patents
A kind of processing method of personal dosimeter's vibration proof and electromagnetic interference 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
- G01T1/02—Dosimeters
Abstract
The invention discloses the processing methods of a kind of personal dosimeter's vibration proof and electromagnetic interference, the following steps are included: the positive reference voltage for adjusting the intergrade or the reversed proportional amplifier of afterbody in reversed proportional amplifier unit is V in the detection system critical component of Si-PIN detector, charge sensitive preamplifier, reversed proportional amplifier and the first discriminator compositionref, make baseline waveform output signal value of the detection system critical component before the first differentiation device in VrefFluctuation nearby；In addition to the first discriminator, it is further added by the second discriminator, forward and reverse examination is carried out to pulse waveform signal；It completes in conjunction with the signal processing software platform based on microprocessor to nuclear signal and impact vibration, the separation removal of electromagnetic interference signal is handled.The present invention effectively removes the influence of impact vibration and electromagnetic interference signal, especially especially effective in no radiation exposure to instantaneous interference signal.
Description
Technical field
The present invention relates to ionising radiation the field of test technology, in particular to digital personal dosimeter's vibration proof and electromagnetism spoke
The processing method that blackberry lily is disturbed.
Background technique
Digital personal dosimeter is at present mainly using Si-PIN semiconductor as nuclear radiation detector.Due to will be to ray
With the low current signal of Si-PIN detector interaction, it is converted to the pulse signal that can count processing, is needed by electricity
Lotus sense amplifier and reversed proportional amplifier and discriminator are handled.
Since the critical component that Si-PIN detector and charge amplifier form is easy by external impact vibration and electricity
Magnetic radiation is interfered, and can generate the disturbing pulse signal of difference with normal nuclear signal in output end.Electromagnetic interference source mainly includes
Equipment and the facilities such as radio station, radar station, wireless WiFi, mobile phone, base station.Usually Si-PIN detector and charge-sensitive are put
The critical components such as big device are electromagnetically shielded using metals such as copper, aluminium and iron, carry out vibrationproof, damp-proof treatment using sealant.But
Above-mentioned measure can not exclude the interference effect of external impact vibration and electromagnetic radiation completely.External impact vibration and electromagnetic radiation
Interference can change resistance and capacitance in detector critical component, influence amplification factor and background noise is horizontal, screening
Device can export disturbing pulse signal.Therefore, it need to be vibrated and electromagnetism spoke in conjunction with the method for software processing exclude external impact
The interference effect penetrated.
The present invention is National special scientific equipment development project funding project (project name: novel ionization spoke
Detecting instrument and key components development and application are penetrated, project number: 2013YQ090811).
Summary of the invention
Technical problem to be solved by the invention is to provide the places of a kind of personal dosimeter's vibration proof and electromagnetic interference
Reason method solves personal dosimeter's the phenomenon that there are vibratory impulse and electromagnetic interferences, improves the integrity problem of instrument.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of processing method of personal dosimeter's vibration proof and electromagnetic interference, comprising the following steps:
Step 1: in Si-PIN detector, charge sensitive preamplifier, reversed proportional amplifier and the first discriminator
In the detection system critical component of composition, the reversed ratio of intergrade or afterbody adjusted in reversed proportional amplifier unit is put
The positive reference voltage of big device is Vref, make baseline waveform output signal of the detection system critical component before the first differentiation device
Value is in VrefFluctuation nearby；
Step 2: in addition to the first discriminator, being further added by the second discriminator, forward and reverse examination is carried out to pulse waveform signal, really
It is positive pulse signal that nuclear signal, which is protected, by the output of reversed proportional amplifier unit；
Step 3: completing in conjunction with the signal processing software platform based on microprocessor to nuclear signal and impact vibration, electromagnetism spoke
Penetrate the separation removal processing of interference signal.
Further, the step 3 specifically:
Step 3.1: under the conditions of having ray, or in the case of having electromagnetic interference or having impact vibration, the first differentiation
The pulse of device output enters the counter of microprocessor unit, and Counter Value carries out accumulation increasing by the counting in the time of unit gap
Add, for calculating intergal dose, meanwhile, being saved with 3 registers includes current time interval and the first two time interval
Count value, for carrying out software processing to electromagnetic radiation or impact vibration event；
Step 3.2: the pulse signal that the second differentiation device exports under the conditions of having electromagnetic radiation or impact vibration enters micro- place
The external interrupt pin of device is managed, the response of singlechip interruption program is interrupted, and electromagnetic radiation and impact vibration event, label deposit are recorded
Device Flag is equal to 1；
Step 3.3: microprocessor main program works in time interval TbaseTo pass through inquiry Flag mark in the circulation in period
Know register, judges whether to vibration and electromagnetic interference processing；If Flag is equal to 1, electromagnetic radiation or punching are indicated
Vibration event is hit, while Flag mark is zeroed out；If it is 0, noiseless event is indicated；
Step 3.4: assuming that (N-2) Tbase、(N-1)·Tbase、N·Tbase(N+1) TbaseFirst in time interval
The step-by-step counting of discriminator output is respectively KN-2、KN-1、KNAnd KN+1, wherein N is greater than 2；When in NTbaseIt is main in interval time
Program inquiring electromagnetic radiation, impact vibration event registers Flag are equal to 1, then count value KNUse KN-2Instead of KN-1Also K is usedN-2Generation
It replaces.
Further, the VrefIt is arranged within the scope of 100mV~500mV, that is, adjusts among reversed proportional amplifier unit
The positive reference voltage of grade or the reversed proportional amplifier of afterbody is Vref, so that VrefWithin the scope of 100mV~500mV.
Further, positive negative pulse stuffing differentiation is carried out to the baseline waveform in step 1 using two-way comparator；The threshold value of examination
Voltage under the conditions of the vibration of no external impact and electromagnetic interference and radiationless source, can be gone according to detector output waveform
Subject to the background noise formed except detector and circuit parameter；Positive and negative differentiation threshold value is respectively Vref+Vthrod、Vref-VthrOd,
VthrOd is controlled in 50mV or so.
Further, the two-way discriminator signal of detection system critical component output, positive discriminator signal enter microprocessor
Counting unit, negative sense discriminator signal enters the external interrupt pin of microprocessor, and external interrupt is set as failing edge triggering.
Further, the step 3.4 further include: (N+1) TbaseTime interval count value KN+1Also (N-2) is used
TbaseCount value K in time intervalN-2Instead of.
Further, the interval time TbaseGreater than 100 milliseconds.
Compared with prior art, the beneficial effects of the present invention are: effectively removing external impact vibration and electromagnetic interference
The influence of signal, it is especially especially effective in no radiation exposure to instantaneous interference signal.
Detailed description of the invention
Fig. 1 is exemplary output waveform figure of Si-PIN detector under the conditions of ray.
Fig. 2 is exemplary output waveform figure of the Si-PIN detector under impact vibration disturbed condition.
Fig. 3 is exemplary output waveform figure of Si-PIN detector under the conditions of electromagnetic interference.
Fig. 4 is personal dosimeter's vibration proof and electromagnetic interference structure principle chart.
Specific embodiment
Realization of the invention mainly Si-PIN detector, charge sensitive preamplifier, reversed proportional amplifier with
And in the detection system critical component of discriminator composition, reference voltage V is superimposed to reversed proportional amplifier linkref, make output
Baseline waveform output signal value is in VrefFluctuation nearby.Meanwhile increasing a discriminator in discriminator unit, the purpose is to be formed
The ability of forward and reverse examination can be carried out to pulse signal.It completes to believe core in conjunction with the signal processing software platform based on microprocessor
Number and impact vibration, electromagnetic interference signal separation removal processing.
Detector critical component is in single-stage type signal characteristic in the output pulse waveform of radioactive source condition, by external impact
Impulse waveform data in the case of vibration and electromagnetic interference are in twin-stage type feature, are based on features described above, can be by walking as follows
It is rapid to realize that external impact vibration and the removal of electromagnetic interference signal are handled.
The positive reference voltage for adjusting reversely proportional amplifier more reversed than amplifier intergrade or afterbody is Vref, Vref
For the value of setting within the scope of 100mV~500mV, the purpose of this step is to make detection system critical component before differentiation device unit
Baseline waveform output signal value in VrefFluctuation nearby.
Positive negative pulse stuffing differentiation is carried out to baseline waveform using two-way comparator.The threshold voltage of examination value is defeated according to detector
Waveform can remove detector and circuit ginseng under the conditions of the vibration of no external impact and electromagnetic interference and radiationless source out
Number form at background noise subject to.Positive and negative differentiation threshold value is respectively Vref+Vthrod、Vref-Vthrod,VthrodIt can be controlled in the left side 50mV
It is right.
The two-way discriminator signal of detection system critical component output, positive discriminator signal enter the counting list of microprocessor
Member, negative sense discriminator signal enter the external interrupt pin of microprocessor, and external interrupt is set as failing edge triggering Working mould
Formula.
The negative-going signal that Micro-processor MCV is generated in the case where having impact vibration and electromagnetic interference signal conditioning passes through first
External interrupt is responded, and interrupt response programming indicia register Flag is equal to 1.Main program is right by flag register Flag
Positive waveform count in unit time is handled.If Flag is equal to 1, indicate there is interference, then when abandoning current one
Interior count value, direct impulse is counted using the count value in preceding 2 unit intervals, while carrying out dosimetry parameter meter
It calculates；If it is 0, indicate that count value is normal there is no interference, the count value for substituting into current time interval carries out dosimetry parameter meter
It calculates.
The present invention will be described in more detail with reference to the accompanying drawing.
Firstly, building Si-PIN detector, charge sensitive preamplifier, reversed proportional amplifier and discriminator composition
Detection system critical component platform.Using high-speed oscilloscope difference test probe critical component in radioactive source or Standard Ratio
Pulse output waveform under the conditions of field (such as Fig. 1), impact vibration (such as Fig. 2) and electromagnetic interference (such as Fig. 3), and pass through USB
Impulse waveform data to computer is uploaded to make into next wave f orm analysis.
From in Fig. 1, Fig. 2 and Fig. 3 it is found that discovery detector critical component under radioactive source or Standard Ratio field condition, arteries and veins
Waveform is rushed in single-stage type signal characteristic；Arteries and veins of detector critical component by external impact vibration and electromagnetic interference
Wave data is rushed, interference signal waveform is in twin-stage type feature；Find the impulse waveform duration of interference signal in millisecond simultaneously
In grade range.
For features described above, the solution of Fig. 4 is proposed.As can be known from Fig. 4, under normal running conditions, Si-PIN is visited
It surveys device and is generated low current signal by radiation exposure, become voltage pulse signal by U1 charge amplifier, using anti-
The signal that can carry out step-by-step counting processing is enlarged into proportional amplifier.Reversed proportional amplifier can be level-one, can also be with
For multistage, output need to be superimposed V by U2 similar amplifierrefReference signal makes its baseline waveform data in VrefNeighbouring wave
It is dynamic, VrefValue range is in 100mV~500mV.
U3 and U4 is differentiation device unit.The anode of the signal connection U3 of reversed proportional amplifier U2 output, connects the negative of U4
Pole.The direct impulse that U3 exports reversed proportional amplifier is screened, the negative-going pulse that U4 exports reversed proportional amplifier
It is screened.The discriminator of U3 is Vref+Vthrod, the discriminator V of U4ref-Vthrod。VrefValue range 100mV~
500mV, VthrodGenerally in 50mV or so.U3 differentiation device in the case where having ray or disturbed condition, output be rising edge pulse side
Wave signal.U4 differentiation device under the conditions of having ray without output, under noisy condition, output be failing edge pulse square wave letter
Number.U3 differentiation device is in no ray or without electromagnetism, and under no impact vibration disturbed condition, output is low level signal；U4 differentiation device exists
Have under the conditions of ray and electromagnetic-radiation-free, exports high level signal under the conditions of no impact vibration.
The signal of U3 differentiation device output enters the counter unit of MCU unit.When under the conditions of having ray or having electromagnetism dry
In the case of disturbing or having impact vibration, the pulse of U3 differentiation device output enters the counter of MCU unit, Counter Value cumulative rises.
U4 differentiation device is having electromagnetic radiation, and the pulse signal exported under the conditions of impact vibration enters the external interrupt pin of MCU, single-chip microcontroller
Interrupt routine response is interrupted, and electromagnetic radiation, impact vibration event are recorded, and flag register Flag is equal to 1.
MCU main program works in time interval TbaseFor in the circulation in period.By inquiring Flag marker register, judgement
Whether vibration and electromagnetic interference software processing are carried out.If Flag is equal to 1, then it represents that have electromagnetic radiation or impact vibration thing
Part；If it is 0, then it represents that noiseless event.
Assuming that (N-2) Tbase、N-1)·Tbase、N·Tbase(N+1) TbaseU3 discriminator exports in time interval
Step-by-step counting be respectively KN-2、KN-1、KNAnd KN+1(N is greater than 2), interval time TbaseGenerally higher than 100 milliseconds (since interference is believed
Number duration in millisecond range).When in NTbaseIn interval time, main program inquires electromagnetic radiation, impact vibration event
Register Flag is equal to 1, then count value KNUse KN-2Instead of KN-1Also K is usedN-2Instead of.KNDo not use KN-1It substitutes and uses KN-2Instead of
The reason of be in Fig. 2, vibratory impulse generate interference signal direct impulse may first occur, so previous interval
(N-1)·TbaseThere may be positive disturbing pulses for the counting of generation.In Fig. 3, when there is electromagnetic interference condition,
It will appear positive interference signal in negative sense waveform follow-up time, therefore (N+1) TbaseTime interval count value KN+1Also it uses
(N-2)·TbaseCount value K in time intervalN-2Instead of.When there are external impact vibration and electromagnetic interference signal,
Count value within the period for occurring interfering is replaced with the count value of preceding 2 periods.The method of the present invention can effectively remove outer
The influence of portion's impact vibration and electromagnetic interference signal, it is especially especially effective in no radiation exposure to instantaneous interference signal.
Claims (6)
1. a kind of processing method of personal dosimeter's vibration proof and electromagnetic interference, which comprises the following steps:
Step 1: being formed in Si-PIN detector, charge sensitive preamplifier, reversed proportional amplifier and the first discriminator
Detection system critical component in, adjust the intergrade or the reversed proportional amplifier of afterbody in reversed proportional amplifier unit
Positive reference voltage be Vref, baseline waveform output signal value of the detection system critical component before the first differentiation device is made to exist
VrefFluctuation nearby；
Step 2: in addition to the first discriminator, being further added by the second discriminator, forward and reverse examination is carried out to pulse waveform signal, it is ensured that core
Signal is positive pulse signal by the output of reversed proportional amplifier unit；
Step 3: completing to do nuclear signal and impact vibration, electromagnetic radiation in conjunction with the signal processing software platform based on microprocessor
Disturb the separation removal processing of signal；The step 3 specifically:
Step 3.1: under the conditions of having ray, or in the case of having electromagnetic interference or having impact vibration, the output of the first differentiation device
Pulse enter the counter of microprocessor unit, Counter Value carries out cumulative rises by the counting in the time of unit gap, uses
In calculating intergal dose；Meanwhile the counting including current time interval and the first two time interval is saved with 3 registers
Value, for carrying out software processing to electromagnetic radiation or impact vibration event；
Step 3.2: the pulse signal that the second differentiation device exports under the conditions of having electromagnetic radiation or impact vibration enters microprocessor
External interrupt pin, the response of singlechip interruption program interrupts, and records electromagnetic radiation and impact vibration event, flag register
Flag is equal to 1；
Step 3.3: microprocessor main program works in time interval TbaseTo be posted by inquiry Flag mark in the circulation in period
Storage judges whether to vibration and electromagnetic interference processing；If Flag is equal to 1, electromagnetic radiation or impact vibration are indicated
Dynamic event, while Flag mark is zeroed out；If it is 0, noiseless event is indicated；
Step 3.4: assuming that (N-2) Tbase、(N-1)·Tbase、N·Tbase(N+1) TbaseFirst screens in time interval
The step-by-step counting of device output is respectively KN-2、KN-1、KNAnd KN+1, wherein N is greater than 2；When in NTbaseIn interval time, main program
Electromagnetic radiation is inquired, impact vibration event registers Flag is equal to 1, then count value KNUse KN-2Instead of KN-1Also K is usedN-2Instead of.
2. a kind of processing method of personal dosimeter's vibration proof and electromagnetic interference as described in claim 1, feature exist
In the VrefIt is arranged within the scope of 100mV~500mV, that is, adjusts reversed proportional amplifier unit intergrade or afterbody is anti-
It is V to the positive reference voltage of proportional amplifierref, so that VrefWithin the scope of 100mV~500mV.
3. a kind of processing method of personal dosimeter's vibration proof and electromagnetic interference as described in claim 1, feature exist
In using two-way comparator to the baseline waveform progress positive negative pulse stuffing differentiation in step 1；The threshold voltage of examination is according to detector
Output waveform can remove detector and circuit under the conditions of the vibration of no external impact and electromagnetic interference and radiationless source
Subject to the background noise that parameter is formed；Positive and negative differentiation threshold value is respectively Vref+Vthrod、Vref-Vthrod, VthrodControl is on the left side 50mV
It is right.
4. a kind of processing method of personal dosimeter's vibration proof and electromagnetic interference as described in claim 1, feature exist
In the two-way discriminator signal of detection system critical component output, positive discriminator signal enters the counting unit of microprocessor, negative sense
Discriminator signal enters the external interrupt pin of microprocessor, and external interrupt is set as failing edge triggering.
5. a kind of processing method of personal dosimeter's vibration proof and electromagnetic interference as described in claim 1, feature exist
In the step 3.4 further include: (N+1) TbaseTime interval count value KN+1Also (N-2) T is usedbaseIn time interval
Count value KN-2Instead of.
6. a kind of processing method of personal dosimeter's vibration proof and electromagnetic interference as claimed in claim 5, feature exist
In the interval time TbaseGreater than 100 milliseconds.
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| CN113406687A (en) * | 2021-06-21 | 2021-09-17 | 中国兵器装备集团自动化研究所有限公司 | Electronic personal dosimeter with ultra-wideband wireless communication function and communication method |
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| JP2001051062A (en) * | 1999-08-12 | 2001-02-23 | Aloka Co Ltd | Radiation measuring device and noise elimination method |
| JP2005069960A (en) * | 2003-08-27 | 2005-03-17 | Matsushita Electric Ind Co Ltd | Electronic type dosemeter |
| CN103399235A (en) * | 2013-08-01 | 2013-11-20 | 苏州朗骥电子科技有限公司 | Detection and elimination method for electronic noise and electromagnetic interference |
| WO2016122347A1 (en) * | 2015-01-30 | 2016-08-04 | Otkrytoe Aktsionernoe Obschestvo "Intersoft Evraziya" | Modular dosimeter/radiometer with low-level protocols do-ra module |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001051062A (en) * | 1999-08-12 | 2001-02-23 | Aloka Co Ltd | Radiation measuring device and noise elimination method |
| JP2005069960A (en) * | 2003-08-27 | 2005-03-17 | Matsushita Electric Ind Co Ltd | Electronic type dosemeter |
| CN103399235A (en) * | 2013-08-01 | 2013-11-20 | 苏州朗骥电子科技有限公司 | Detection and elimination method for electronic noise and electromagnetic interference |
| WO2016122347A1 (en) * | 2015-01-30 | 2016-08-04 | Otkrytoe Aktsionernoe Obschestvo "Intersoft Evraziya" | Modular dosimeter/radiometer with low-level protocols do-ra module |
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