APPARATUS FOR SIMULTANEOUS MEASUREMENT OF VELOCITY AND TEMPERATURE OF FLYING PARTICLE

摘要

PURPOSE:To enable the accurate, easy and non-contact measurement of the velocity of a particle, by providing a cylindrical lens, a spatial filter, a convex condensing lens and an optical fiber. CONSTITUTION:Part of a light converged by a cylindrical lens 2 is reflected by an oblique mirror, while the other part thereof passes through a gap part between flat plates of a spatial filter 3, so that a periodical alteration of the intensity of light be generated. This transmitted light is led to an optical fiber 5 through a convex condensing lens 4. In other words, the intensity of the light entering the optical fiber 5 is large when a flying particle 1 is located on an extension of a gap between the flat plates and is small when the particle is located on an extension of the thickness of each flat plate. Since this relation is not varied even when the distance between the particle 1 and the filter 3 is varied, the velocity can be measured accurately without being affected by the distance between the measured particle and a measuring apparatus. When an emission of the fiber 5 is condensed into a photoelectric conversion element 7 by a lens 6 and the alteration of the intensity thereof is measured, peaks equivalent to the number of the gaps of the filter 3 are detected by a signal analyzer 8 as the particle 1 moves.