CN1419109A - Full matched method for raising nucleon balance accuracy and nucleon balance made by using method - Google Patents

Full matched method for raising nucleon balance accuracy and nucleon balance made by using method Download PDF

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CN1419109A
CN1419109A CN 02153937 CN02153937A CN1419109A CN 1419109 A CN1419109 A CN 1419109A CN 02153937 CN02153937 CN 02153937 CN 02153937 A CN02153937 A CN 02153937A CN 1419109 A CN1419109 A CN 1419109A
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gamma
gamma ray
scale
ray detector
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CN1259550C (en
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陈鸣震
陈三雄
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BEIJING TSINGDA TECHNOLOGY Co Ltd
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BEIJING TSINGDA TECHNOLOGY Co Ltd
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Abstract

The invention refers to a high-accuracy nucleon balance, discloses a full-matching nucleon balance whose sensing system, mathematic model and the distribution of the weighed material all match with the physical model, and uses the full-seal nucleon balance body which eliminates the effect of the high-temperature and moist material on the weighting precision and makes the measuring precision largely improved.

Description

The uclear scale that full matched improves the method for uclear scale precision and uses this method to make
Technical field
The invention belongs to the ray detection technical field, relate to a kind of method of measuring quality of material or weight, relate in particular to the uclear scale that a kind of full matched improves the method for uclear scale precision and uses this method.
Background technology
Uclear scale is to utilize gamma-rays to pass material the principle that decays to take place and a kind of dynamic loose unpacked material meter control equipment of making.
The uclear scale that sell the domestic and international market, all forming without exception by gamma ray projector, scale body support frame, gamma ray detector, speed pickup and secondary instrument etc.When the conveying belt of conveyer passes through between the gamma ray projector of uclear scale and gamma ray detector, part gamma-rays is absorbed by material, part gamma-rays passes material and enters gamma ray detector, material thick more (many) is many more by the gamma-rays that material absorbs, and it is just few more to enter the gamma-rays of gamma ray detector.Therefore, the power of gamma ray detector output signal can reflect the thickness (how much) of material.
This process has following expression according to the gamma-rays decay law:
U＝U 0e -μd……………………………………(1)
In the formula: U 0-uclear scale do not have material by the time, the gamma ray detector output signal;
When the U-uclear scale has material to pass through, the gamma ray detector output signal;
μ-gamma ray absorption coefficient;
The d-material thickness;
Can calculate material thickness d by equation (1), d = 1 μ q · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ( 2 )
In the formula, q=lnU 0/ U is called the thickness factor
According to material thickness d, width l and density p, the material load F on can the unit's of calculating strap length,
F＝d×l×ρ?…………………………………(3)
F＝K 0q??………………………………………(4)
K 0=l ρ/μ=constant ... (5)
According to belt speed υ and material load F, can calculate mass flow P by uclear scale scale body,
P＝F·υ………………………………………(6)
At t 1-t 2In time, the material general assembly (TW) W of the uclear scale scale body of flowing through is, W = ∫ t 1 t 2 F · υdt = Σ i = 1 i = n F i · υ i Δ t i · · · · · · · · · · · · · · ( 7 )
The key parameter of Weighing of Nuclear is load F, and equation (4) and (5) are the mathematical models that existing uclear scale generally adopts, and from the rationale of this model establishment as can be known, it both was positioned at the ray field on the collimated beam, had also ignored the influence of scattered photon.
In fact, uclear scale adopts the point-like radioactive source mostly, and gamma ray detector is always operating at the near field.Therefore, gamma-rays is a spherical radiation, i.e. fladellum, and non-parallel beam.Simultaneously, because the existence of background objects (comprising scale body support frame, conveying belt, material and nearby objects etc.), gamma ray detector always is in the great gamma ray scattering field, therefore, in the uclear scale metering, the influence of scattered photon be can not ignore, though Chinese patent CN1011912B has included buildup factor B in its disclosed mathematical model, considered the influence of scattered photon, but this patent will be positioned on the collimated beam ray field.
Chinese patent CN2397481Y discloses the linear radioactive source of length that uses near parallel beam,gamma-ray, and its mathematical model is not further mated, and this has also influenced the raising of uclear scale weighing precision.
Chinese patent CN2444235Y discloses a kind of multiple spot source uclear scale, and its physical model does not further mate, and has restricted the raising of uclear scale weighing precision.
Its above scheme, its physics, mathematical model are coarse, must have bigger model approximation error.
Summary of the invention
In the existing technology, it only is the consideration of r being penetrated the field, and constantly improve, but the coupling of uclear scale r ray field physical model and mathematical model, it is one of key factor that influences the uclear scale measuring accuracy, the objective of the invention is to overcome the problem in the existing uclear scale technology, the method that a kind of full matched improves the uclear scale measuring accuracy is proposed, its core concept is to select the coupling mathematical model according to r ray field, to reach the optimum matching of mathematical model and physical model, and the uclear scale that uses this method to make, to realize high-precision measuring to alleged material.For achieving the above object, the present invention has adopted following technical scheme: a kind of full matched improves the method for uclear scale measuring accuracy, and it may further comprise the steps:
(1) tested material is passed through a gamma ray projector and a r ray detector that is provided with in opposite directions by conveyer;
(2) by sensor-based system (primary instrument) when measuring no material the output voltage of gamma ray detector be U o, the output voltage of ray detector was U when material was arranged;
Speed V when (3) measuring material through the gamma-rays workspace;
(4) and to above-mentioned measured value carry out data processing output result by signal processing system (secondary instrument);
And:
The uclear scale mathematical model and the uclear scale physical model of the signal processing system of described uclear scale are complementary;
The sensor-based system of described uclear scale (primary instrument) is complementary with the physical model of uclear scale;
Distribution and uclear scale physical model by the tested material of gamma-rays workspace in a gamma ray projector that is provided with in opposite directions and the gamma ray detector are complementary.
When distinguishing the different physical model of parallel wide beam radiation field and fan-shaped wide beam radiation field, to the influence of its used mathematical model:
(3) when the gamma-rays radiation field is the physical model as mentioned above of parallel wide beam in its workspace, its as mentioned above mathematical model be:
F＝Kq K = K 0 ( 1 + ln B q ) = K 0 + K 0 ln B × q ‾
Wherein: F-material load;
The K-coefficient of weighing;
The q-thickness factor;
The inverse of q-q;
The B-buildup factor, relevant with gamma-rays photon energy, material properties, thickness, gamma ray projector collimating aperture shape, gamma ray detector characteristic etc.;
K 0-constant;
The C-constant.
Described K=K 0+ K 0LnB * q uses refractive line equation K=b n+ k nQ comes match, the intercept b in the fit equation parameter nAnd slope k nDetermine that by materials calibration calibrating procedure is:
(1), calibrates F according to payload 1, F 2..., F N+1The corresponding COEFFICIENT K of weighing of each load point 1, K 2..., K N+1And thickness factor q 1, q 2, Λ, q N+1
(2), each parameter of calibrating according to (1), determine the intercept b of each broken line by straight-line equation nAnd slope k n b n = K n + [ K n + 1 - K n q ‾ n + 1 - q ‾ n ] q ‾ n k n = K n + 1 - K n q ‾ n + 1 - q ‾ n Thereby draw mathematical model.
(4) when the gamma-rays radiation field is the aforesaid physical model of fan-shaped wide beam in its workspace, its aforesaid mathematical model is:
F＝Kq K = K 0 ( 1 + ln B q ) ( 1 - cq )
Wherein: F-material load;
The K-coefficient of weighing;
The q-thickness factor;
The B-buildup factor, relevant with gamma-rays photon energy, material properties, thickness, gamma ray projector collimating aperture shape, gamma ray detector characteristic etc.;
K 0-constant;
The C-constant.
Described K = K 0 ( 1 + ln B q ) ( 1 - cq ) Be to use refractive line equation K=b n+ h nQ comes match.Fit equation parameter intercept b nAnd slope k nDetermine that by materials calibration calibrating procedure is:
(1), calibrates F according to payload 1, F 2..., F N+1The corresponding COEFFICIENT K of weighing of each load point 1, K 2..., K N+1And thickness factor q 1, q 2..., q N+1
(2), each parameter of calibrating according to (1), determine the intercept b of each broken line by straight-line equation nAnd slope k n b n = K n + [ K n + 1 - K n q n + 1 - q n ] · q n K n = K n + 1 - K n q n + 1 - q n
Thereby draw mathematical model.
A kind of full coupling high precision uclear scale of making according to above-mentioned measuring method, comprise that scale body support frame, gamma ray projector, material transmitting device, gamma ray detector, speed pickup, sensor-based system (primary instrument) and signal processing system (secondary instrument) form, gamma ray projector places the top of scale body support frame, gamma ray detector places the below of scale body support frame, between gamma ray projector and gamma ray detector, there is the transmitting device of delivery material to pass through
And:
The gamma-rays workspace of the gamma ray projector of described uclear scale sensor-based system and the receive window of gamma ray detector is complementary and coincide.
Above the material transmitting device belt feeder before material enters uclear scale a guiding device is arranged;
Have at the outside surface of gamma ray detector and to prevent that the gamma ray scattering photon from entering the metal-coating of detector.
Described guiding device can be quantity tube or diversion trench, and the material outlet of quantity tube is shaped as rectangle or trapezoidal; The transverse shape of diversion trench also is a rectangle or trapezoidal.
Described gamma ray detector is surrounded by the metal-coating of an anti-gamma-ray scattered photon outward, described metal-coating can be plumbous matter or steel, this circumferential surface has the rectangle window to the one side of gamma ray projector, the gamma-rays that gamma ray projector sends enters in the gamma detector by this window, and the size of window and gamma-rays work radiation area are complementary.
Scale body support frame in the described sensor-based system is formed a seal cavity by top board, biside plate, front and back backplate and base plate, use welding, bonding or screw connection back adhesive tape sealing between top board, side plate, backplate and the base plate, an adjustable metal ray shutter respectively is installed at the two ends of base plate bottom, the beam,gamma-ray of gamma ray projector directive gamma detector passes through between this two plate, and the width of this beam,gamma-ray and gamma-rays workspace are complementary.
The sensor-based system of uclear scale and uclear scale physical model are complementary; The uclear scale mathematical model and the uclear scale physical model of the signal processing system of described uclear scale are complementary; Material on the described belt feeder distributes and the uclear scale physical model is complementary.
The receive window of the gamma ray detector that the present invention adopts comprises the width of alleged material just, and the gamma-rays workspace of its gamma ray projector also contains the width that covers alleged material just, gamma-rays in the gamma-rays workspace enters gamma ray detector by the receive window of material and gamma ray detector, thereby realizes that uclear scale sensor-based system and uclear scale physical model are complementary.
The distribution shape of the alleged material of uclear scale on carrier strip is one of key factor that influences the Weighing of Nuclear precision, and different r rays physical model after the match requires different material distributions to be complementary.Above the belt of the present invention before material enters uclear scale, guiding device has been installed.This guiding device can be a quantity tube, it also can be diversion trench, for gamma field is under the parallel wide beam physical model, the optimal cross-section that the material that the guiding device combing is come out distributes is a rectangle, be that the optimal cross-section that the material that the guiding device combing is come out distributes is trapezoidal under the fan-shaped wide beam physical model for r ray field.
The uclear scale mathematical model that different gamma field physical models is corresponding different the invention provides:
When 1, the yardstick that adopts the wire gamma ray projector when uclear scale was greater than the line length of gamma ray detector, the gamma-rays radiation field can be considered parallel wide beam physical model, and its optimum matching mathematical model is:
F＝Kq…………………………………………………(8) K = K 0 ( 1 + ln B q ) = K 0 + K 0 ln B × q ‾ · · · · · · · · · · · · · · ( 9 )
In the formula: the K-coefficient of weighing q ‾ = 1 q
The B-buildup factor, relevant with gamma-rays photon energy, material properties, thickness, gamma ray projector collimating aperture shape, gamma ray detector characteristic etc.
From formula (9) as can be known: the COEFFICIENT K of weighing is the linear function of thickness factor q, changes with the variation of q.
Formula (9) is a linear equation, available in actual applications refractive line equation
K＝b n+k nq………………………………………(10)
Come match.
In the formula: b n-intercept
k n-slope.
2, when uclear scale adopted the point-like gamma ray projector, the gamma-rays radiation field can be considered fan-shaped wide beam physical model, and its optimum matching mathematical model is:
…………………………………………(11)
F＝Kq K = K 0 ( 1 + ln B q ) ( 1 - cq )
Or K=K '-K ' cq ... (12)
K ' in the formula=K 0(1+1nB/q)
The c=constant;
The q=thickness factor;
As can be known, the COEFFICIENT K of weighing is the linear function of thickness factor q from formula (12), changes with the variation of q.Formula (12) is a linear equation, available in actual applications refractive line equation
K＝b n+k nq…………………………………………(13)
Come match.
In the formula: b n-intercept
k n-slope
The COEFFICIENT K of weighing fit equation determination method for parameter:
1, as ray K=b when being parallel wide beam shape in the perform region n+ k nq
Its step is as follows: (1) is materials calibration at first: determine under the different load F corresponding the thickness factor q and the values of factor K of weighing successively by payload.As shown in table 1.(2) calculation of parameter: utilize straight-line equation to determine each broken line equation parameter.Determine the accurate K value of each broken line by linear interpolation.Shown in table 2 and accompanying drawing 6.Table 1:
Figure A0215393700121
Table 2:
2. as ray K=b when being fan-shaped wide beam shape in the perform region n+ k nq
Its step is as follows:
(1) materials calibration at first: determine under the different load F corresponding the thickness factor q and the values of factor K of weighing by payload successively.As shown in table 3.
(2) calculation of parameter: utilize straight-line equation to determine each broken line equation parameter.Determine the accurate K value of each broken line by linear interpolation.Shown in table 4 and accompanying drawing 5.Table 3: Table 4:
Figure A0215393700131
The gamma ray detector that uclear scale of the present invention adopted is surrounded by the plumbous matter or the steel overcoat of an anti-gamma-ray scattered photon outward, and the shape of overcoat can be circle, square or any polygon.Have the rectangle window at overcoat towards the one side of gamma ray projector, the gamma-rays that gamma ray projector sends is received by gamma detector by this window, and the size of window is consistent with gamma-rays work radiation area.Thereby guarantee that further uclear scale sensor-based system and uclear scale physical model are complementary.
Uclear scale scale body support frame of the present invention is formed a seal cavity by top board, biside plate, front and back backplate and base plate, use welding, bonding or screw connection back adhesive tape sealing between top board, side plate, backplate and the base plate, an adjustable metal ray shutter respectively is installed at the two ends of base plate bottom, the beam,gamma-ray of gamma ray projector directive gamma ray detector passes through between this two plate, and the width of this beam,gamma-ray is consistent with the workspace in the logistics of gamma-rays transport tape.Simultaneously, the gamma-rays that the front and back backplate of this shutter and scale body support frame has blocked beyond the gamma-rays workspace can not enter near the gamma-rays receiving sensor, thereby has significantly reduced the influence of gamma ray scattering photon to the uclear scale measuring accuracy.Simultaneously, this kind scale body support frame is because sealing, also greatly reduced the influence to the uclear scale measuring accuracy of high moisture material, moisture.
Main points of the present invention are structure and the measurement using method that propose physical model, mathematical model, material distributed model and the uclear scale thereof of full coupling uclear scale.
Major advantage of the present invention is the uclear scale measuring accuracy height of full coupling, and suitable fluctuations in discharge scope is big, still can carry out accurate measurement for the moist material of high temperature.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing:
Fig. 1 adopts the uclear scale structural representation of quantity tube for the present invention;
Fig. 2 is for adopting the uclear scale synoptic diagram of guiding device;
Fig. 3 is the front elevation of uclear scale sensor-based system;
Fig. 4 is the A-A sectional view of Fig. 3;
Fig. 5 is the function relation curve of weigh COEFFICIENT K and thickness factor q under the fan-shaped wide beam model;
Fig. 6 is the function relation curve of weigh COEFFICIENT K and thickness factor q under the parallel wide beam model; Optimum implementation
Below by specific embodiment the present invention is further described:
As shown in Figure 1, this uclear scale mainly is made up of gamma ray projector 1, scale body support frame 2, gamma ray detector 3, speed pickup 4, signal processing system (secondary instrument) 5 etc.Gamma ray projector 1 can be line source, point source or multiple spot source and constitutes, and it places the top of scale body support frame 2, and gamma ray detector 3 places the below of scale body support frame 2, is surrounded by overcoat 6 in the outside of detector 3, and this overcoat is plumbous matter or steel.Have rectangle window 7 in the one side towards gamma ray projector, the width of this window is identical with the diameter of gamma ray detector, also is that the size and the gamma-rays work radiation area of window is complementary.This overcoat has also stoped the gamma ray scattering photon to enter in the gamma ray detector 3 greatly simultaneously, makes the uclear scale metering accurately stable more.Between gamma ray projector and gamma ray detector, there is the belt feeder 9 of delivery material 8 to pass through, quantity tube (guiding device) 10 is installed in the top that material enters the preceding belt feeder 9 of uclear scale, material enters into belt feeder by the mouth of quantity tube (guiding device) 10 tops, and the shape (rectangle or trapezoidal) that exports according to quantity tube makes material enter uclear scale by rectangle or trapezoidal profile.
Fig. 2 is that guiding device is the embodiment of diversion trench structure.Diversion trench 11 makes and enters the preceding material of uclear scale by rectangle or trapezoidal profile, thereby has realized that material distributes and the uclear scale physical model is complementary.
Fig. 3 is the front elevation of uclear scale sensor-based system, and Fig. 4 is the A-A sectional view of Fig. 3, finds out from this embodiment, and uclear scale scale body support frame is hermetically sealed.It forms a seal cavity by top board 12, biside plate 13, apron plate 14 back backplates 15 and base plate 16, the sealing space is hedged off from the outer world, two adjustable metal ray shutters 17 are loaded on the two ends of base plate 16, the beam,gamma-ray of gamma ray projector directive gamma detector 3 passes through between two shutters 17, the workspace width of this beam,gamma-ray is consistent with the length of gamma ray detector sensitive volume, also is that the width and the gamma-rays radiation workspace of beam is complementary.
Fit equation K=b n+ k nQ and K=b n+ k nThe equation parameter b of q nAnd k n, determine by materials calibration, be example with the fladellum uclear scale.Four refractive line equations are determined by five groups of nominal datas.Example is as follows:
(1) earlier with little load F 1=3.010Kg/m demarcates.Obtain the COEFFICIENT K of weighing 1=24.82Kg/m and thickness factor q 1After=0.1212, strengthen load F successively, respectively at load F 2, F 3, F 4, F 5Under demarcate, obtain the with it corresponding COEFFICIENT K of weighing 2, K 3, K 4, K 5With thickness factor q 2, q 3, q 4, q 5, see Table 5.
(2) obtain refractive line equation coefficient b according to calibrating parameters nAnd k n, see Table 6.Table 5: Table 6:
Broken line ?????1 ????2 ????3 ????4
Loading zone q ??q≤0.2152 ?????0.2152-0.3133 ????0.3133-0.426 ?q≥0.426
Intercept b n ?????23.84 ?????22.34 ????20.69 ????19.01
Slope k n ?????8.063 ?????7.986 ????7.808 ????7.618
Uclear scale of the present invention is applied widely, all can carry out high-precision measuring for the occasion that hot and humid material, mass flow change greatly.It makes the measuring accuracy of uclear scale bring up to 0.25 grade from existing 1.0 grades, 0.5 grade.This kind uclear scale is the optimal selection of trade settlement.

Claims (9)

1. a full matched improves the method for uclear scale measuring accuracy, and its method may further comprise the steps:
(1) tested material is passed through a gamma ray projector and a gamma ray detector that is provided with in opposite directions by conveyer;
(2) by sensor-based system (primary instrument) when measuring no material the output voltage of gamma ray detector be U o, the output voltage of ray detector was U when material was arranged;
Speed V when (3) measuring material through the gamma-rays workspace;
(4) and to above-mentioned measured value carry out data processing and export the result by signal processing system (secondary instrument);
2. method according to claim 1 is characterized in that:
(1) when the gamma-rays radiation field is the physical model as mentioned above of parallel wide beam in its workspace, its as mentioned above mathematical model be:
F＝Kq K 0 = K 0 ( 1 + ln B q ) = K 0 + K 0 ln B × q ‾
Wherein: F-material load;
The K-coefficient of weighing;
The q-thickness factor;
The inverse of q-q;
The B-buildup factor, relevant with gamma-rays photon energy, material properties, thickness, gamma ray projector collimating aperture shape, gamma ray detector characteristic;
K 0-constant;
(2) when the gamma-rays radiation field is the aforesaid physical model of fan-shaped wide beam in its workspace, its aforesaid mathematical model is:
F＝Kq K = K 0 ( 1 + ln B q ) ( 1 - cq )
Wherein: F-material load;
The K-coefficient of weighing;
The q-thickness factor;
The B-buildup factor, relevant with gamma-rays photon energy, material properties, thickness, gamma ray projector collimating aperture shape, gamma ray detector characteristic;
K 0-constant;
The C-constant.
3. the mathematical model when method according to claim 1, gamma field are parallel wide beam physical model is characterized in that:
Described K=K 0+ K 0LnB * q uses refractive line equation K=b n+ k nQ comes match, the intercept b in the fit equation parameter nAnd slope k nDetermine that by materials calibration calibrating procedure is:
(1) calibrates F according to payload 1, F 2..., F N+1The corresponding COEFFICIENT K of weighing of each load point 1, K 2..., K N+1And thickness factor q 1, q 2, Λ, q N+1
(2), determine the intercept b of each broken line by straight-line equation according to each parameter that calibrates in above-mentioned (1) nAnd slope k n b n = K n + [ K n + 1 - K n q ‾ n + 1 - q ‾ n ] q ‾ n k n = K n + 1 - K n q ‾ n + 1 - q ‾ n
Thereby draw mathematical model.
4. the mathematical model when method according to claim 1, gamma field are fan-shaped wide beam physical model is characterized in that:
Described K = K 0 ( 1 + ln B q ) ( 1 - cq ) Be to use refractive line equation K=b n+ k nQ comes match.Fit equation parameter intercept b nAnd slope k nDetermine that by materials calibration calibrating procedure is:
(1) calibrates F according to payload 1, F 2..., F N+1The corresponding COEFFICIENT K of weighing of each load point 1, K 2..., K N+1And thickness factor q 1, q 2...., q N+1
(2), determine the intercept b of each broken line by straight-line equation according to each parameter that calibrates in top (1) nAnd slope k n b n = K n + [ K n + 1 - K n q ‾ n + 1 - q ‾ n ] · q n K n = K n + 1 - K n q n + 1 - q n
Thereby draw mathematical model.
5. full coupling high precision uclear scale of making according to the described method of claim 1, comprise that sensor-based system (primary instrument) and signal processing system (secondary instrument) that scale body support frame, gamma ray projector, material transmitting device, gamma ray detector, speed pickup are formed form, gamma ray projector places the top of scale body support frame, gamma ray detector places the below of scale body support frame, between gamma ray projector and gamma ray detector, there is the transmitting device of delivery material to pass through
It is characterized in that:
The uclear scale mathematical model and the uclear scale physical model of the signal processing system of described uclear scale are complementary, the gamma-rays workspace of the gamma ray projector of uclear scale sensor-based system and the receive window of gamma ray detector is complementary and coincide, material shapes on the device for transporting objects and nuclear weigh instrument physical model are complementary.
6. uclear scale according to claim 5 is characterized in that:
Above the material transmitting device before material enters uclear scale a guiding device is arranged;
Have at the outside surface of gamma ray detector and to prevent that the gamma ray scattering photon from entering the metal-coating of detector.
This guiding device can be quantity tube or diversion trench, and the material outlet of quantity tube is shaped as rectangle or trapezoidal; The transverse shape of diversion trench also is a rectangle or trapezoidal.
7. full coupling high precision uclear scale that measuring method according to claim 5 is made, comprise the scale body support frame, gamma ray projector, the material transmitting device, gamma ray detector, sensor-based system that speed pickup is formed (primary instrument) and signal processing system (secondary instrument) are formed, gamma ray projector places the top of scale body support frame, gamma ray detector places the below of scale body support frame, have the transmitting device of delivery material to pass through between gamma ray projector and gamma ray detector, it is characterized in that: the gamma-rays workspace of the gamma ray projector of described uclear scale sensor-based system is with the receive window of gamma ray detector is complementary and identical;
Above the material transmitting device belt feeder before material enters uclear scale a guiding device is arranged; This guiding device can be quantity tube or diversion trench, and the material outlet of quantity tube is shaped as rectangle or trapezoidal; The transverse shape of diversion trench also is a rectangle or trapezoidal;
Have at the outside surface of gamma ray detector and to prevent that the gamma ray scattering photon from entering the metal-coating of detector.
8. the full coupling high precision uclear scale that measuring method according to claim 5 makes, it is characterized in that: described gamma ray detector is surrounded by the metal-coating of an anti-gamma-ray scattered photon outward, described metal-coating can be plumbous matter or steel, this circumferential surface has the rectangle window to the one side of gamma ray projector, the gamma-rays that gamma ray projector sends enters in the gamma detector by this window, and the size of window and gamma-rays work radiation area are complementary.
The uclear scale mathematical model of the signal processing system of described uclear scale is an optimum matching in the uclear scale physical model; The described window of reception of the gamma-rays workspace of the gamma ray projector of described uclear scale sensor-based system and gamma ray detector is complementary and coincide.
9. the full coupling high precision uclear scale that measuring method according to claim 4 is made, comprise that sensor-based system (primary instrument) and signal processing system (secondary instrument) that scale body support frame, gamma ray projector, material transmitting device, gamma ray detector, speed pickup are formed form, gamma ray projector places the top of scale body support frame, gamma ray detector places the below of scale body support frame, between gamma ray projector and gamma ray detector, there is the transmitting device of delivery material to pass through
It is characterized in that: described gamma ray detector is surrounded by the metal-coating of an anti-gamma-ray scattered photon outward, described metal-coating can be plumbous matter or steel, this circumferential surface has the rectangle window to the one side of gamma ray projector, the gamma-rays that gamma ray projector sends enters in the gamma detector by this window, and the size of window and gamma-rays work radiation area are complementary.
Above the material transmitting device belt feeder before material enters uclear scale a guiding device is arranged; This guiding device can be quantity tube or diversion trench, and the material outlet of quantity tube is shaped as rectangle or trapezoidal; The transverse shape of diversion trench also is a rectangle or trapezoidal;
Scale body support frame in the described sensor-based system is formed a seal cavity by top board, biside plate, front and back backplate and base plate, use welding, bonding or screw connection back adhesive tape sealing between top board, side plate, backplate and the base plate, an adjustable metal ray shutter respectively is installed at the two ends of base plate bottom, the beam,gamma-ray of gamma ray projector directive gamma detector passes through between this two plate, and the width of this beam,gamma-ray and gamma-rays workspace are complementary.
Described ionization chamber is that the sensitive volume of ionization chamber and prime amplifier district are carried out thermostatic control respectively, or whole constant temperature control.
CN 02153937 2002-07-02 2002-12-06 Full matched method for raising nucleon balance accuracy and nucleon balance made by using method Expired - Fee Related CN1259550C (en)

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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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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