Article

Article title THE CHOICE OF CAMERA POSITION TO MINIMIZE THE MEASUREMENT ERROR OF THE FUEL ASSEMBLY HEAD
Authors S.L. Balabaev, E.G. Lozovskaya
Section SECTION II. RADIO ENGINEERING, TELECOMMUNICATIONS
Month, Year 08, 2015 @en
Index UDC 621.397.13
DOI
Abstract The non-contact the height’s measurement system of the fuel assembly heads with a single CCD camera is investigated. The distance between the centers of gravity of the upper surfaces of any adjacent heads of the fuel assembly (FA) is equal to 234 mm. The algorithm the heights’ measurements of the fuel assembly heads includes the moving of the camera around the circumference of a 3 m radius, forming the picture from six positions. The suspension’s height of video camera is 2.6 m provides the simultaneous observation of the seven of the fuel assembly heads. The optical axis of the video camera passes through the center of gravity of the cell. It is supposed to use the camera CDR 3223 Baxall with the 24 mm lens focal length and the pixel resolution of CCD 800600. The heights of the fuel assembly heads are assumed to be 3 mm. The mathematical model of the recording camcorder used in the medium MathCAD and its software let to capture discrete pixel coordinates in which the gravity centers of the fuel assemblies’ upper surfaces are. And 30 discrete pixel coordinates for the seven gravity centers of the fuel assembly’s upper surfaces, depending on the combination of two video camera positions are fixed. In total, by all-round visibility of the unit cell 210 coordinates for the gravity center of each of the fuel assemblies’ upper surfaces are formed. Three stereo pairs of images are analyzed in detail, as a combination of measurements obtained from 4 camera positions: from two consecutive (adjacent) angles, from positions in one angle and from oppositely directed angles. The achievable minimum height measurement errors are identified and defined, from which it is advisable to take the measurements. The minimum height measurement error of the fuel assembly heads (71 m, 2.4%) is provided from the oppositely directed angles of video camera for points, not located on the axis of a stereo pair (the stereo base is maximum 6 meters). The height, measured in the video camera position in the least distance from the observation point, should be taken instead of the result. It is proved that for the maximum precision height measurement of the fuel assembly heads we can limit the changes of the results of video camera angles from the opposite direction.

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Keywords The fuel assembly; the measurement of height; the non-contact measurement method; the CCD camera; the reconstruction of three-dimensional scene; the methodical error.
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