CN1068651A - Intelligence twinkle nucleon balance - Google Patents

Intelligence twinkle nucleon balance Download PDF

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Publication number
CN1068651A
CN1068651A CN 92105002 CN92105002A CN1068651A CN 1068651 A CN1068651 A CN 1068651A CN 92105002 CN92105002 CN 92105002 CN 92105002 A CN92105002 A CN 92105002A CN 1068651 A CN1068651 A CN 1068651A
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China
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source
scintillation detector
spectrum
capacitor
resistance
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CN 92105002
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Chinese (zh)
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侯朝勤
张崇庆
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Shijiazhuang Radiation Tech Development Centre Of No 404 Factory
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Shijiazhuang Radiation Tech Development Centre Of No 404 Factory
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Priority to CN 92105002 priority Critical patent/CN1068651A/en
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Abstract

The invention discloses the uclear scale that constitutes by linear radiation source, spectrum stabilization detector and intelligent main frame.Because linear radiation source, signal transmission form and the check figure of having initiated novel spectrum stabilization technology, novel structure according to treatment technology, make the basic parameter-ray counting good stability of instrument in 0.05%; Certified test results is: the long-time stability and the linearity that are used for the belt feeder metering are better than 0.1; Dynamic measurement maximum error in kind≤0.15%.Can be used for multiple transporters such as spiral, anchor chain, bucket type, scraper plate, belt.

Description

Intelligence twinkle nucleon balance
The invention belongs to the on-line continuous field of measuring technique, specifically a kind of intelligence twinkle nucleon balance.
In the conveying of every profession and trade loose unpacked material, need carry out automatic cumulative measurement to quality of material.In the past, often adopt the piezo-electricity sensing type belted electronic balance.Along with applying of nuclear science technology, occurred uclear scale in recent years, it utilizes ray to be carried out non-contact measurement by the principle that material absorbs, and measures the influence that is not subjected to the belt feeder state, but with the ionization chamber be sensor exist subject matter be output signal too a little less than, have only 10 -11A, bring following problem thus:
A. the leakage current of ionization chamber structured material is big to the interference of signal, and is very high to the insulating property requirement of material;
When b. the weak current signal being amplified, the zero point drift of direct current amplifier, noise etc. are bigger to the influence of measuring, and cause the drift of instrument;
C. detection efficiency is low, needs the activity height of radioactive source, generally 10 10More than the Bq;
D. signal is weak, the radioactivity statistic fluctuation is big.For reducing statistic fluctuation, adopted bigger integration time constant, be generally 60-100 second, make to the variation response of material insensitive;
F. the signal is far passed difficulty generally can only transmit about 30 meters.
Adopt scintillation detector can overcome above-mentioned shortcoming, but have following problem:
A. scintillation detector length is too little, can not adapt to the width of belt and material.
B. less stable, stability is general to adopt following several automatic steady peak technology in order to improve:
The one, the differential peak stabilizing technique, the stabilizing power of differential peak stabilizing technique is relatively poor, is generally 3%; Two steady state (SS)s are arranged, easily run the peak and cause the measurement mistake; When detector resolution changed, measurement result also changed.
The 2nd, the integration peak stabilizing technique, the stability of integration peak stabilizing technique and precision are also relatively poor, are about 2%; The poor linearity of measuring when counting rate to be measured changes, causes the superthreshold change in count, and steady state (SS) is changed, and causes the result of high count rate higher, and the measurement result of low counting rate is on the low side.
The 3rd, the steady peak of standard sources method, its shortcoming are to compensate the later gain drift of photomultiplier, and be all powerless to the variation of scintillation crystal luminescence efficiency and resolution.
What stability that scintillation detector is current and repeatability index were best is 1~2%.
The objective of the invention is to design a kind of simple in structure, cost is low, the intelligence twinkle nucleon balance of reliable operation, good stability, to overcome above-mentioned shortcoming.
At first, the present invention has adopted linear radiation source to replace point source commonly used, and this just might adapted length less scintillation detector still can adapt to the belt and the material of broad.
Simultaneously, the present invention has adopted area under spectrum proportional integral spectrum stabilization technology, and the simple designs thought of this technology is:
On spectrum curve, choose 2 points, upper and lower two discrimination thresholds be set, measure the output intergral counting rate of upper and lower two discriminators, have a ratio K between two counting rates, with " guaranteeing that ratio K is constant " as stable condition.When the skew of parameters of operating part such as scintillator photomultiplier, amplifier variation causing spectrum curve, cause ratio K to change, the K value is detected, its variable quantity generates deviation signal, this departure is gone to adjust high-voltage power supply after amplifying, thereby change the gain of photomultiplier, spectral line is recalled to.The power spectrum that this principle of design goes for range detector spare (for example scintillation counter, proportional counter tube etc.) is stable.According to above-mentioned design philosophy, this twinkle nucleon balance that the present invention provides is a kind of intelligence twinkle nucleon balance, comprise radioactive source 1, scintillation detector 2 and intelligent main frame 3, scintillation detector 2 comprises shell 4, scintillator 5, photomultiplier 6 and amplifier 7, it is characterized in that radioactive source 1 adopts linear radiation source, also be provided with high-pressure generator 8 and the spectrum stabilization circuit 9 that is used to stablize, adjust the scintillation detector output spectrum in the shell 4 of scintillation detector 2, detector 2 is connected through single core cable 10 with main frame 3.
Because adopt the pin-connected panel linear source, its linearity, homogeneity are all better; This spectrum stabilization circuit has following characteristics:
A. to the parameter of photomultiplier, amplifier change, the variation of scintillator luminescence efficiency and resolution and ambient temperature change the drift that the influence to above-mentioned parts produces and all can compensate;
B. can not produce and run the peak phenomenon;
C. the linearity is better than 0.1%;
D. the long-time stability of radiation meter digit rate are better than 0.05%.
Simple in structure, advantages such as cost is low, reliable operation, good stability, good linearity that the present invention has.
The present invention has following accompanying drawing:
Fig. 1 twinkle nucleon balance structural representation
Fig. 2 scintillation detector structural representation
Fig. 3 linear source structural representation
Fig. 4 linear source diagrammatic cross-section
Fig. 5 source rod structural representation
Fig. 6 spectrum stabilization circuit diagram
The another kind of spectrum stabilization circuit diagram of Fig. 7
Fig. 8 host panel synoptic diagram
Below in conjunction with accompanying drawing the present invention is described in further detail.
Accompanying drawing 1 is the twinkle nucleon balance structural representation, comprises radioactive source 1, scintillation detector 2 and intelligent main frame 3.Respectively there is an installing plate 26 at radioactive source 1 two ends, have slotted eye 30 on the installing plate 26, fixed hook 27, nut 29 are fixed on installing plate 26 the channel-section steel 28(or the angle steel of belt feeder bracing frame together with radioactive source 1) on, A-bracket 31 is fixed on the two ends of radioactive source 1, and scintillation detector 2 is installed in the top of support 31.The ray of radioactive source 1 arrives detector and is counted behind material, absorb the speed that what and belt of ray move according to material, can weigh up the weight of material.Said structure can be referring to Fig. 9.
Accompanying drawing 2 is the scintillation detector structural representation, comprise shell 4, scintillator 5, photomultiplier 6 and amplifier 7, also have high-pressure generator 8 and the spectrum stabilization circuit 9 that is used to stablize, adjust the scintillation detector output spectrum in the shell of scintillation detector 2, detector 2 is connected through single core cable 10 with main frame 3.Main frame is sent 5~18V direct supply here, provides low-tension supply to each circuit of detector behind high frequency strategic point stream circle 32, and high-pressure generator 8 can adopt known oscillator, produces 500~1500V high-voltage power supply with mode of oscillation, supplies with photomultiplier 6.The control signal of spectrum stabilization circuit 9 outputs is through adjusting the size that pipe 25 goes to adjust the high pressure output valve.Output of spectrum stabilization circuit and the corresponding constant amplitude pulse signal of radiation meter digit rate on capacitance C5 is added to transmission cable 10, is delivered to main frame and are gone to handle.Because be that constant amplitude pulse transmits, the length pulse signals amplitude of cable 10 and frequency and pulse number do not exert an influence, transmitting range can reach more than 1000 meters.The amplitude of constant amplitude pulse can be designed to 3~9 volts.Owing to adopting single core cable to transmit signal, bring great convenience for installation and use, maintenance.
A feature of the present invention is to adopt linear radiation source, and its intensity only needs 10 7Bq/cm, therefore, the environmentAL safety performance is good.Linear source can adopt the thread source of cobalt-60 or the narrow slab source of americium-241, and they are applicable to the big or measurement of thin material of thickness respectively, for the material of most of intermediate gauge, can adopt the thin source rod of caesium-137.Accompanying drawing 3~accompanying drawing 5 has provided a kind of linear source; it is characterized in that said linear radiation source 1 is that the source rod 12 of 50~200mm is assembled by length; source rod 12 places in the metal sleeve 13; metal sleeve 13 places the center of the lead shield 15 that has open slot 14; source rod 12 is made up of stainless steel external protection 16, stainless steel inner protective layer 17 and core body 18, and core body 18 is radioactive material and ceramic post sintering ceramic core body together.
The manufacture method of this radioactive source is as follows:
A. with the radiation source material sintering in ceramic core body 18;
B. choose polylith core body 18(or a long clavate core body of radioactive intensity unanimity) to put into length be in the stainless steel cylinder 17 of 50~200mm, adds a cover then, welds, seals, hunt leak;
C. the outside is overlapped one deck stainless steel cylinder 16 again, welds, seals, hunts leak, and just becomes single line shape radiation source rod 12;
D. many wire source rods 12 are assembled into linear source, total length is corresponding with belt width, is placed in the metal sleeve 13;
E. lead shield 15 also can be adopted the way of assembly unit, and metal sleeve 13 places the center of lead shield 15, and during installation, the open slot 14 of lead shield upwards faces toward scintillation detector 2.
The present invention has provided a kind of area under spectrum proportional integral spectrum stabilization technical scheme, and its main points are:
Choose two points on spectrum curve, upper and lower discrimination threshold is set, measure the counting rate of upper and lower threshold output, both ratio is K, is stable condition with " guaranteeing that the K value is constant ".When instrument drift causes spectral line shift, cause the K value to change, detect the variable quantity of K value, deviate is gone to adjust high-voltage power supply, with the way that changes gain of photomultiplier the spectral line of skew is recalled to.The K value detects and can be realized by following 3 kinds of schemes:
A. upper and lower threshold output signal enters two counting rate pump circuits, and the ratio of the charge transfer quantity of two pump circuits also is set at K, and the output voltage of two pump circuits is subtracted each other, and generates deviation;
B. with upper and lower threshold output signal, carry out frequency division earlier, the ratio of two-way divide ratio is set at K, two pump circuits with same transitions efficient subtract each other then, generate deviation;
C. upper and lower threshold output signal is sent into computing machine, carries out ratio with software and calculates, and generates deviation;
The deviation that utilization is generated is removed to adjust high pressure again or directly the counting rate after the drift is compensated, to guarantee the stable of power spectrum.
Fig. 6 has provided a kind of spectrum stabilization technical scheme, it is characterized in that said spectrum stabilization circuit 9 is by last discriminator 19, down discriminator 20, wave- shaping circuit 21,22, capacitor C 1, C2, diode D1, D2, D3, D4, resistance R, integrating amplifier 11, resistance R 1 and adjust pipe 25 and form, wherein capacitor C 1/C2=K.
Fig. 7 has provided another kind of spectrum stabilization technical scheme, it is characterized in that said spectrum stabilization circuit 9 is by last discriminator 19, down discriminator 20, frequency divider 23,24, capacitor C 3, C4, diode D1, D2, D3, D4, resistance R, integrating amplifier 11, resistance R 1 and adjust pipe 25 and form, capacitor C 3=C4 wherein, the ratio of frequency divider 23,24 divide ratios is K.
These two kinds of spectrum stabilization technical schemes are all very simple, and required element cost is also very low, but effect is fine, and Installation and Debugging are easy, and reliable operation does not produce and runs the peak phenomenon.The typing certified test results is as follows:
Long-time stability:<0.1%
Repeated, linear:<0.1%
Dynamic accumulation error in kind<0.15%
Fig. 8 is the host panel synoptic diagram.Host design is intelligent main frame, should possess following function:
A. can compensate automatically Radioactive Source Decay;
B. non-linear the compensating that can cause factors such as instrument dead time, resolving time, environmental activity background, ambient volume scattering effects;
C. can follow the tracks of the unloaded zero point of instrument, realize automatic zero set (AZS), this is to realize by the intelligent functions of microcomputer, it can carry out analysis and judgement to instrument mode, whether the belt zero load is judged, obtain the empty counting rate of real band, deposit microcomputer automatically in, carry out automatic tracking correction at zero point.This can eliminate the influences of system factor to measuring such as belt weares and teares, scale falls ash.
Fig. 9 is the radioactive stand structural representation, and the mounting means of radioactive source, detector is as follows:
Respectively there is an installing plate 26 at radioactive source 1 two ends, have slotted eye 30 on the installing plate 26, fixed hook 27, nut 29 are fixed on installing plate 26 on the belt feeder bracing frame together with radioactive source 1, radioactive source 1 two ends are fixed with A-bracket 31, scintillation detector 2 is fixed on the top of support 31, and concrete structure can be referring to Fig. 1 and Fig. 9.

Claims (4)

1, a kind of intelligence twinkle nucleon balance, comprise radioactive source 1, scintillation detector 2 and intelligent main frame 3, scintillation detector 2 comprises shell 4, scintillator 5, photomultiplier 6 and amplifier 7, it is characterized in that radioactive source 1 adopts linear radiation source, also be provided with high-pressure generator 8 and the spectrum stabilization circuit 9 that is used to stablize, adjust the scintillation detector output spectrum in the shell 4 of scintillation detector 2, detector 2 is connected through single core cable 10 with main frame 3.
2, uclear scale as claimed in claim 1; it is characterized in that said linear radiation source 1 is that the source rod 12 of 50~200mm is assembled by length; source rod 12 places in the metal sleeve 13; metal sleeve 13 places the center of the lead shield 15 that has open slot 14; source rod 12 is made up of stainless steel external protection 16, stainless steel inner protective layer 17 and core body 18, and core body 18 is radioactive material and ceramic post sintering ceramic core body together.
3, as the uclear scale of claim 1 or 2, it is characterized in that said spectrum stabilization circuit 9 is by last discriminator 19, down discriminator 20, wave-shaping circuit 21,22, capacitor C 1, C2, diode D1, D2, D3, D4, resistance R, integrating amplifier 11, resistance R 1 and adjust pipe 25 and form, wherein capacitor C 1/C2=K.
4, as the uclear scale of claim 1 or 2, it is characterized in that said spectrum stabilization circuit 9 is by last discriminator 19, down discriminator 20, frequency divider 23,24, capacitor C 3, C4, diode D1, D2, D3, D4, resistance R, integrating amplifier 11, resistance R 1 and adjust pipe 25 and form, capacitor C 3=C4 wherein, the ratio of frequency divider 23,24 divide ratios is K.
CN 92105002 1992-06-26 1992-06-26 Intelligence twinkle nucleon balance Pending CN1068651A (en)

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CN 92105002 CN1068651A (en) 1992-06-26 1992-06-26 Intelligence twinkle nucleon balance

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1039160C (en) * 1995-06-16 1998-07-15 北京清大电子仪器联合公司 Small sensible weight and high precision belt nuclear balance
WO2001011324A1 (en) * 1999-08-10 2001-02-15 Shengcai Di A method for precisely measuring the weight of mass material and a nucleonic weigher employing this method
CN108051069A (en) * 2018-01-09 2018-05-18 北京工业职业技术学院 The calibration method of X-ray uclear scale and X-ray uclear scale

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1039160C (en) * 1995-06-16 1998-07-15 北京清大电子仪器联合公司 Small sensible weight and high precision belt nuclear balance
WO2001011324A1 (en) * 1999-08-10 2001-02-15 Shengcai Di A method for precisely measuring the weight of mass material and a nucleonic weigher employing this method
CN108051069A (en) * 2018-01-09 2018-05-18 北京工业职业技术学院 The calibration method of X-ray uclear scale and X-ray uclear scale
CN108051069B (en) * 2018-01-09 2023-11-21 北京工业职业技术学院 Calibration method of X-ray nucleon balance and X-ray nucleon balance

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