SCANNING DEVICE AND METHOD FOR MEASUREMENT AND ANALYSIS OF CIRCULAR HOLES IN TRANSPARENT LIQUIDS IN IONIZING RADIATION ENVIRONMENT

摘要

A method for measurement and analysis of circular holes in a ionizing radiation environment in a transparent liquid based on measurement of distance between a scanned surface and a rotation axis of a measuring head by laser triangulation method and a scanning device for executing this method, wherein the internal profile of a hole or of a caliber is scanned point by point during the measuring head rotation with at least one optical assembly rotating around its rotation axis and located in the hole, wherein the measuring head is inserted into the removable or integrated caliber and calibrated, correction equations are calculated from the obtained referential data, the measuring head is then extended into the initial scanning position, the actual measurement by automatic point by point scanning takes place during the rotation of the measuring head to cover the entire internal area of the hole, thereby obtaining the scanned internal profile of the hole in a cross-section; after the scanning, the head is inserted into a housing, the correction equations are applied to the measured data from which the distances between the scanned surface and the rotation axis of the measuring head are calculated, characterized in that the scanning device is impermeably sealed against liquids prior to calibration and measurement initiation and immersed in the ambient liquid environment around the object hole and that a pressure equal to or higher than the pressure of the external ambient environment is maintained inside the housing by pumped gas or mixture of gases.