RU2002103508A - METHOD OF HIGH-PRECISION MEASUREMENT OF WEIGHT OF MATERIALS AND NUCLEAR WEIGHTS FOR ITS IMPLEMENTATION - Google Patents

Claims (7)

1. The method of high-precision measurement of the weight of materials, which includes the following stages (1) install several sources of γ-radiation and the corresponding γ-ray detectors, place a conveyor between them; (2) measuring the output voltage U ₀ and U _{i of the} γ-ray detector in the presence and absence of materials and injecting U ₀ and U _i into a data processing device that is connected to the γ-ray detector; (3) using a speed meter, measure the speed V _{i of the} transport belt located on the conveyor, and inject V _i into a data processing device (PLC), which is connected to the speed meter; (4) using the data processing device, calculate the total weight W of the transported materials for a certain period of time according to the formula

in this case, depending on the change in the load and the scattering of γ-rays, you can change the calibrated coefficient K, and by changing the load of materials you can determine the calibrated coefficient of materials K using the method of calibrating subject materials. 2. The method according to claim 1, characterized in that the calibrated coefficient is determined by subject materials with a changing load of materials, in accordance with the following stages (1) using standard weights, the weight of the materials is weighed and W _{aB is obtained} , while the conveyor transports a constant load to the nuclear weights for measurement; (2) the data processing device collects the output voltage U _i from the γ-ray detector, the speed of the transport tape V _i from the speed meter and the transport time t _i in real time, then the following values are calculated

where B denotes the standard value, and the letters AVG denote the average number, create a coordinate system for the values of F _Ba and (L _n U _i / U ₀ ) _aAVG , where F _B is the abscissa, L _n U _i / U ₀ coordinate, determine the point "a" and get K _a , that is, the gradient oa; (3) for different weights of materials W _bB , W _cB , W _dB , using the above method, determine the points b, s, d, ......, and get K _b , K _s , K _d and the functional ratio F _B = f (LnU _i / U ₀ ). 3. The method according to claim 2, characterized in that they use the linear ratio of many parts of the line and replace the formula F _B = f (L _n Ui / U ₀ ) with the formula F = b _j + k _j L _n (U _i / U ₀ ) , where j is the number of parts of the line, and this is done by connecting the points o and a, a and b, b and c, c and d; ....... obtain parts of the line oa, ab, bc, cd ... , and the definitions of b _j and k _{j of} each part of the line using the coordinate values of the points o, a, b, c, d, .... 4. The method according to claim 2, characterized in that the function F _B = f (LnU _i / U ₀ ) is replaced by a polynomial using the least square method, and the following polynomial F = a ₀ + a ₁ (L _n U _i / U ₀ ) + а ₂ (L _n U _i / U ₀ ) ² + .... + a _k (L _n U _i / U ₀ ) ^k , where К = 0,1,2,3, .... к. 5. Nuclear scales using the invented method include 1-N sources of γ-radiation, where N = 2-10, while the γ-ray detector and the corresponding source of γ-radiation are configured to convert the intensity of the received γ-rays into a parameter voltage, between the γ-ray detector and the source of γ-radiation there is a conveyor, and the balance includes a conveyor speed meter, a microcomputer or a data processing device (PLC), which are connected with the detector and speed meter, and the balance is made with m calculation according to the data of the exact weight of the materials, and the specified source of γ-radiation and a γ-ray detector are installed in a convenient place, which is located in a closed support frame of the balance. 6. Nuclear balance according to claim 5, characterized in that the source of γ radiation is selected from the measured material from ¹³⁷ Cs (Cesium-137), or ⁶⁰ Co (Cobalt-60) or ²⁴¹ Am (Americium-241). 7. Nuclear scales according to claim 5, characterized in that the number of sources of γ-radiation is selected in the range of 2-7.