LASER DOPPLER FLOW RATE MEASURING METHOD AND APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a laser Doppler flow rate measuring method and an apparatus which can perform efficient measurement in a two-dimensionally wide range by a simple optical system and an apparatus using a laser Doppler system.;SOLUTION: The laser Doppler flow rate measuring apparatus comprises: a beam division element 14 for dividing a laser beam L from a laser source 12; sheet light formation optical systems 21, 22, 23, 24 for converting divided laser beams L1, L2 into planar thin sheet light Ls1, Ls2; and a condensing optical system 18 for making each of the divided sheet light Ls1, Ls2 to intersect with each other on the same plane so that the planes of two the sheet light overlap with each other. The laser Doppler flow rate measuring apparatus also comprises: an imaging optical system 26 for two-dimensionally imaging scattered light generated by particles p in fluid in an intersection area D where the sheet light Ls1, Ls2 intersects with each other; a light receiving element 32 on an imaging position of the imaging optical system 26; photoelectric conversion elements 40 for converting scattered light entering the light receiving element 32 into an electric signal; and calculation means 48 for calculating, for each photoelectric conversion element 40, a flow rate of the fluid in the intersection area D where the laser beam L is Doppler frequency-shifted.;COPYRIGHT: (C)2015,JPO&INPIT