METHOD FOR MEASUREMENT OF BENDING OF ARTILLERY BARREL Russian patent published in 2004 - IPC

FIELD: measuring equipment, in particular, methods for measurement of deformations of long-sized structures, for example, artillery barrels of various lengths and calibers. SUBSTANCE: the method is based on formation at the beginning of the barrel of a modulated light beam, direction of it along the barrel, reflection of the light beam from the reflector positioned at the end of the barrel and direction of it through an objective lens to a photodetector of the photodetecting pickup. Formed in the plane of the diaphragm located just before the reflector is a light zone with dimensions exceeding the sum of the dimensions of the diaphragm and the measurement range, in the process of measurement the light beam is continuously reflected in the direction parallel with the line connecting the centers of the objective lens and the diaphragm, an image of the diaphragm is formed by the objective lens on the photodetector, and the linear displacement of the diaphragm relative to the sighting axis of the photodetecting pickup is measured. The value of barrel bending is determined by the results of division of the measured value of diaphragm displacement by the known distance between it and the objective lens of the photodetecting pick. EFFECT: enhanced accuracy of measurement, excluded error caused by an angular instability of the reflector. 1 dwg