Material highprecision weighing method and nucleon balance made by said method
Material highprecision weighing method and nucleon balance made by said method
 CN 1,112,572 C
 Filed: 08/10/1999
 Issued: 06/25/2003
 Est. Priority Date: 08/10/1999
 Status: Active Grant
First Claim
1. , a kind of highprecision measuring method of material, institute is surveyed material to be placed on the conveying device, above described conveying device, be provided with gamma ray radiator, below described conveying device, gamma ray detector is set, on the described conveying device speed measuring device is installed, described gamma ray detector links to each other with the computer data processing system that has data input device and data output device with speed measuring device;
 Described gamma ray detector output voltage U when at first basis has material _{i}And described gamma ray detector output voltage U during no material _{0}, calculate material load F=KLn (U _{i}/ U _{0});
The transporting velocity V that next utilizes described speed measuring device to measure calculates the flow P=FV of described material;
The cumulative amount that calculates the convey materials of described conveying device in a period of time at last is ${W}_{h}=\underset{}{\overset{}{\mathrm{\Σi=1n{F}_{i}{V}_{i}}}}$It is characterized in that;
described formula F=KLn (U _{i}/ U _{0}) in values of factor K, be stream according to described material Quantitative changeization, on described conveying device residing diverse location, pile up shape and gamma ray scattering etc.The influence of factor is dynamically revised.
Litigations
Chinese PRB Reexamination
Abstract
The present invention discloses a high precision measuring method for materials. Constant coefficients in a measure formula F=K(LnUi/Uo) which is adopted by the existing universal nuclear scale are dynamically corrected according to the influence of the factors of flow variation of the materials, different positions of the materials on a transporting device, stacking shape, gamma ray scatterance, etc. The method has a calculating formula: F=bi+KiLn(Ui/Uo) or F=a0+a1 LnUi/Uo+a2(LnUi/Uo)<2>+ to ak(LnUi/Uo)<k>. The present invention also uses the method to manufacture a high precision nuclear scale which has the advantages of high measuring precision, large applicable flow range, wide application area and high stability.
8 Claims

1. , a kind of highprecision measuring method of material, institute is surveyed material to be placed on the conveying device, above described conveying device, be provided with gamma ray radiator, below described conveying device, gamma ray detector is set, on the described conveying device speed measuring device is installed, described gamma ray detector links to each other with the computer data processing system that has data input device and data output device with speed measuring device;
 Described gamma ray detector output voltage U when at first basis has material _{i}And described gamma ray detector output voltage U during no material _{0}, calculate material load F=KLn (U _{i}/ U _{0});
The transporting velocity V that next utilizes described speed measuring device to measure calculates the flow P=FV of described material;
The cumulative amount that calculates the convey materials of described conveying device in a period of time at last is${W}_{h}=\underset{}{\overset{}{\mathrm{\Σi=1n{F}_{i}{V}_{i}}}}$ It is characterized in that;
described formula F=KLn (U _{i}/ U _{0}) in values of factor K, be stream according to described materialQuantitative changeization, on described conveying device residing diverse location, pile up shape and gamma ray scattering etc. The influence of factor is dynamically revised.
 Described gamma ray detector output voltage U when at first basis has material _{i}And described gamma ray detector output voltage U during no material _{0}, calculate material load F=KLn (U _{i}/ U _{0});

2. measuring method according to claim 1 is characterized in that:
 described values of factor K is determined according to the load method;
(1) any definite 1 a on the tested material load, computer data processing system calculate length L, the conveying average load Ln (U of described conveying device by the determination data of the automatic input of data input device _{i}/ U _{0}) _{Mean value}With weight of material W;
(2) will utilize master scale claim weight of material W mark, in the input computer data processing system, calculate Utilize K again _{a}=F _{Mark a}/ Ln (U _{i}/ U _{0}) _{A mean value}, obtain the calibration coefficient K under a point load _{a}Change the material load and utilize same procedure to obtain b, the K that c, d are ordered _{b}, K _{c}, K _{d} (3) draw F _{Mark}Perhaps W _{Mark}, K and Ln (U _{i}/ U _{0}) funtcional relationship F _{Mark}=f (Ln (U _{i}/ U _{0})). (4) according to F _{Mark}=f (Ln (U _{i}/ U _{0})) correction F=f (Ln (Ui/U0))
 described values of factor K is determined according to the load method;

3. measuring method according to claim 2 is characterized in that:
 use variable element methodpolygometry with formula F _{Mark}=f (Ln (U _{i}/ U _{0})) be modified to F=b _{i}+ K _{i}Ln (U _{i}/ U _{0}), according to carrying load to remove to select different valuess of factor K;
(1) determine measurement point o, a, b, c, d determines the method for a straight line to try to achieve the disconnected slope k of broken line with 2 _{i}With intercept b _{i} (2) computer data processing system will be with the conveying of measuring load Ln (U _{i}/ U _{0}) remove to judge the broken line that load is positioned of surveying, select the k of place line segment then _{i}With b _{i}, press F=b _{i}+ K _{i}Ln (U _{i}/ U _{o}) formula calculates.
 use variable element methodpolygometry with formula F _{Mark}=f (Ln (U _{i}/ U _{0})) be modified to F=b _{i}+ K _{i}Ln (U _{i}/ U _{0}), according to carrying load to remove to select different valuess of factor K;

4. measuring method according to claim 2 is characterized in that:
 use variable element methodpolynomial method with formula F _{Mark}=f (Ln (Ui/U0)) is modified to the F=a with polynomial repressentation _{0}+ a _{1}Ln (U _{i}/ U _{o})+a _{2}(Ln (U _{i}/ U _{o})) ^{2}+ ... + a _{k}(Ln (U _{i}/ U _{o})) ^{k}
(1) determines measurement point o, a, b, c, d, every point coordinate (F _{Mark}, Ln (U _{i}/ U _{o})) (2) use polynomial expression F=a _{0}+ a _{1}Ln (U _{i}/ U _{o})+a _{2}(Ln (U _{i}/ U _{o})) ^{2}+ a _{k}(Ln (U _{i}/ U _{o})) ^{k}Calculate, try to achieve multinomial coefficient a with least square method _{0}, a _{1}... a _{K}
 use variable element methodpolynomial method with formula F _{Mark}=f (Ln (Ui/U0)) is modified to the F=a with polynomial repressentation _{0}+ a _{1}Ln (U _{i}/ U _{o})+a _{2}(Ln (U _{i}/ U _{o})) ^{2}+ ... + a _{k}(Ln (U _{i}/ U _{o})) ^{k}

5. a kind of claim 1 of utilizing, 2, the uclear scale that 3 or 4 described methods are made, by support, rackmount end is encapsulated in the gamma ray radiator in the pig, be installed in the gamma ray detector of support lower end, place the device for transporting objects between gamma ray radiator and the gamma ray detector, the computer data processing system that has data input device and data output device, speed measuring device that links to each other with computer data processing system and the prime amplifier that links to each other with computer data processing system are formed, it is characterized in that:
 the described gamma ray radiator that is encapsulated in the pig is 2～
7, be installed in described support upper end, line spread and parallel with described gamma ray detector.
 the described gamma ray radiator that is encapsulated in the pig is 2～

6. uclear scale according to claim 5 is characterized in that:
 the described gamma ray radiator that is encapsulated in the pig can be selected for use according to tested material ^{137}C _{s}, ^{60}C _{0}, ^{241}A _{m}Three kinds of different radioactive sources.

7. uclear scale according to claim 5 is characterized in that:
 described being encapsulated in the pig ^{137}C _{s}The pig of gamma ray radiator is Φ
160～
200mm, and shielding thickness is greater than 7Cm.
 described being encapsulated in the pig ^{137}C _{s}The pig of gamma ray radiator is Φ

8. uclear scale according to claim 5 is characterized in that:
 described gamma ray detector adopts and fills xenon thinwalled long ion chamber, and ionization chamber length is 300～
1500mm.
 described gamma ray detector adopts and fills xenon thinwalled long ion chamber, and ionization chamber length is 300～
Specification(s)