Underwater in-situ deformation measurement of fuel assembly based on line laser 3D vision
In order to solve the problem of underwater in-situ measurement of fuel assembly bending and twisting deformation,an underwater in-situ deformation measurement method of fuel assembly based on line laser 3D vision is proposed.The calibration of single-layer refraction-based underwater camera and plane-constrained optical plane calibration algorithms are used to solve the calibration problem of single measurement unit;ten groups of measurement units based on three-dimensional calibration tooling are quickly calibrated in situ to solve the problem of global coordinate unification of the measurement system and the bending and torsion accuracy of the calibration tooling is measured by laser tracking instrument for the comparative experimental verification of the measurement accuracy.The study shows that the developed underwater in-situ deformation measurement system for fuel assemblies based on line laser 3D vision has an error limit of 0.15° for twist measurement and 0.3 mm for bending measurement,and the whole measurement time is about 1 s,which is better than that of the existing measurement system in terms of the measurement efficiency and measurement error limit.
fuel assemblyunderwater camera calibrationsingle-layer refraction modeldeformation measurement
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