Optical flow sensor through near-field grating diffraction

Michele Norgia

doi:10.1016/j.sna.2013.09.029

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Optical flow sensor through near-field grating diffraction

2013-12-01

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Michele Norgia *

Alessandro Pesatori

DOI：10.1016/j.sna.2013.09.029

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Abstract

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A novel optical flow-meter has been developed, especially designed for very-high flow speed. The system is a variant of laser Doppler velocimeter (LDV), realized by means of an optical phase-grating. Standard LDV generates a fringes pattern by means of two laser beams, intersecting at an angle alpha. For fast flow rates, the fringe period has to be very long, in order to avoid too high output frequencies, therefore a very low angle alpha is required. For the realization of such pattern we propose a different approach, employing an optical grating, working in the near-field range. This technique has been demonstrated by measuring the flow-speed distribution in a water-jet machine. (C) 2013 Elsevier B.V. All rights reserved.

Keywords:

Optical measurement

Optical grating

Water-jet measurement

Flow measurement

Laser Doppler measurement