CN2125132U - Intelligence scintilation nuclear scale - Google Patents
Intelligence scintilation nuclear scale Download PDFInfo
- Publication number
- CN2125132U CN2125132U CN 92225578 CN92225578U CN2125132U CN 2125132 U CN2125132 U CN 2125132U CN 92225578 CN92225578 CN 92225578 CN 92225578 U CN92225578 U CN 92225578U CN 2125132 U CN2125132 U CN 2125132U
- Authority
- CN
- China
- Prior art keywords
- source
- spectrum
- scintillation detector
- transporter
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Measurement Of Radiation (AREA)
Abstract
The utility model discloses a nucleon scale, which is composed of a linear radiation source, a spectrum-stabilizing detector and an intellectualized host machine. Because of originated new-type spectrum-stabilizing technique, the novel-structure linear radiation source, the signal transmission method and nuclear data processing technique, the basic parameter of the meter-the ray registering has stability better than 0.05%; the qualification testing result is that the long-term stability and the linearity which are used for measuring a belt machine is better than 0.1; the maximum error of true object dynamic measuring is smaller than or equal to 0.15%. The utility model can be used for various transporters such as a spiral transporter, an anchor chain transporter, a hopper-type transporter, a scraper transporter, a belt transporter, etc.
Description
The utility model 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 purpose of this utility model be 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 utility model 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 utility model 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 unit 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; There are following characteristics this spectrum stabilization unit:
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%.
The utlity model has simple in structure, advantages such as cost is low, reliable operation, good stability, good linearity.
The utility model 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 cell schematics
The another kind of spectrum stabilization cell schematics of Fig. 7
Fig. 8 host panel synoptic diagram
Below in conjunction with accompanying drawing the utility model is described in further detail.
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 unit 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 unit 9 outputs is through adjusting the size that pipe 25 goes to adjust the high pressure output valve.Output of spectrum stabilization unit 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 utility model 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;
The utility model 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 unit 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 unit 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.
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, and radioactive source 1 two ends are fixed with A-bracket 31, and scintillation detector 2 is fixed on the top of support 31.
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, 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 is 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, also be provided with high-pressure generator 8 in the shell 4 of scintillation detector 2 and be used to stablize, adjust the spectrum stabilization unit 9 of scintillation detector output spectrum, 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 unit 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 unit 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92225578 CN2125132U (en) | 1992-06-26 | 1992-06-26 | Intelligence scintilation nuclear scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92225578 CN2125132U (en) | 1992-06-26 | 1992-06-26 | Intelligence scintilation nuclear scale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2125132U true CN2125132U (en) | 1992-12-16 |
Family
ID=4967761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92225578 Granted CN2125132U (en) | 1992-06-26 | 1992-06-26 | Intelligence scintilation nuclear scale |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2125132U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967222B (en) * | 2005-11-17 | 2011-10-26 | 邸生才 | X-ray cut tobacco fill value measuring method and device therefor |
| 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 |
-
1992
- 1992-06-26 CN CN 92225578 patent/CN2125132U/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967222B (en) * | 2005-11-17 | 2011-10-26 | 邸生才 | X-ray cut tobacco fill value measuring method and device therefor |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3278747A (en) | Method and apparatus for continuously weighing material on a conveyor comprising a radioactive source and detector | |
| CN101349661B (en) | Method for on-line detecting coal ashes on belt | |
| EP3637147B1 (en) | Gain correction apparatus and method for scintillation detector | |
| CN102519993A (en) | Reflection-type x-ray device for detecting ash content and heat productivity of coal and detection method | |
| CN105353400A (en) | Inlaying source device used for scintillation crystal detector gain automatic control | |
| WO1997029356A1 (en) | Method and apparatus for remote density measurement | |
| CN1179207C (en) | Method and system for in-situ testing grade of big ore block by electron-air shielding radiation effect | |
| CN103245680A (en) | Fast neutron imaging method and system based on time-of-flight method | |
| CN1198120C (en) | Method for measuring object-position utilizing natural radioctivity | |
| CN108051069B (en) | Calibration method of X-ray nucleon balance and X-ray nucleon balance | |
| CN1068651A (en) | Intelligence twinkle nucleon balance | |
| CN2125132U (en) | Intelligence scintilation nuclear scale | |
| CN102841366A (en) | Method and system for detecting discrimination threshold of pulse-amplitude discriminator | |
| US4182954A (en) | Method and apparatus for measuring material properties related to radiation attenuation | |
| Hoover et al. | Measurement of neutron absorption cross sections with a pile oscillator | |
| CN2847241Y (en) | X-ray online weight meter | |
| US5412217A (en) | Density-moisture measuring apparatus | |
| CN1152250C (en) | In-line water content measuring method and instrument by fast nutron and gamma ray absorption | |
| CN1026436C (en) | Microcomputer controlled nucleon operated belt conveyor scale | |
| CN1082661C (en) | Stock quantity measuring method and device for high temperature high pressure reactor | |
| RU1823925C (en) | Method of calibrating radiometric ash meters for cars | |
| RU226827U1 (en) | Wide-range gamma radiation detection unit | |
| EP0532488A1 (en) | An improved method for evaluating sample activities in a multidetector liquid scintillation counter | |
| US5416328A (en) | Method for evaluating sample activities in a multidetector liquid scintillation counter | |
| CN1020165C (en) | Low-radiation high-stability conveyer-belt nucleon weigher |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |