Discussions on the Development of Multipoint-Simultaneous Velocity Measurement Device-Beam-Scan type LDV-

Hironaga, K.; Hino, Motoharu

doi:10.2208/prohe1975.29.775

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1987

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“…Consequently, we endeavored to extend further the ability of LOY without losing the salient features of quantitative and non-disturbing measurement. Several attempts have been made recently by some investigators (Uchiyama and Hakomori 1980, Hironaga and Hino 1985, Ikeda et al, 1985. The back-and-forth motion of a focussing lens may be one of the simplest ways of scanning along the axis of a main laser-beam.…”

Section: T Introductionmentioning

confidence: 99%

Flow structure measurement by beam scan type LDV

et al. 1987

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A new type of laser Doppler vclocimeter called SLV (Scan-Type Laser-Doppler Velocimeter) which can measure the velocity field almost continuously and simultaneously has been developed and tested. The principle of the apparatus is to traverse the focal point of split laser beams by reflecting them with a rotating polygon mirror or an oscillating mirror which is driven (and controlled) by a stepping motor and to receive the scattered Doppler signals by a photomultiplier by focusing them through a cylindrical lens. The signals from the photomultiplier and the driving pulse of the stepping motor were transmitted to a personal computer and processed on-line.Experiments on the oscillatory boundary layer, Karman vortices. and vortex rings were carried out to check the performance.

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Section: T Introductionmentioning

confidence: 99%