MEASURING APPARATUS BY LASER-INDUCED FLUORESCENCE METHOD

摘要

PURPOSE: To provide an apparatus in which a density and a flow velocity can be measured simultaneously by a laser-induced fluorescence method and in which the flow velocity can be measured two-dimensionally. ;CONSTITUTION: A measuring apparatus is provided with means 1, 2 which output a dye pulsed laser beam at a wavelength corresponding to an electron energy difference, with a means 3 which branches the laser beam, with two cylindrical lenses 5a, 5b to which a plurality of linear reflection coatings have been executed and with a means 4 by which two striped sheet beams passed through the cylindrical lenses 5a, 5b are incident on a measuring field 12 at different angles. In addition, the measuring apparatus is provided with means 6, 7, 8 by which mesa-shaped light and dark parts formed on the measuring field 12 are measured and with a computing unit 10 by which the density of measured molecules is decided on the basis of the fluorescent intensity of the bright parts out of the measured mesh-shaped bright and dark parts and by which the flow velocity of the measured molecules and their movement direction are found two- dimensionally on the basis of the movement, in terms of time, of the crossing of the dark parts.;COPYRIGHT: (C)1996,JPO