A single laser all fibre based optical sensor and switching system and method for measuring velocity in atmospheric air flow

Ebba Dellwik (Inventor), Jakob Mann (Inventor), Leif Kristensen (Inventor), Torben Mikkelsen (Inventor)

Research output: Patent

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A system for measuring a velocity of tracer
particle motion in a fluid comprising at least one laser emitter
configured to emit a continuous wave laser beam and a plur
ality of optical devices being configured to alternately receive
a laser beam, focusing the laser beam onto a same probe
volume comprising tracer particles, and receiving backscattered
light from the tracer particles. The optical devices
have a common optical input/output port for transmitting the
received continuous-wave laser beam and for receiving the
backscattered radiation. The optical devices are provided to
have mutual pointing angles so that each of the plurality of
optical devices points at the probe volume under a different
angle. A processor is configured to receive a part of the trans -
mitted laser beam and the received backscattered radiation
beam to calculate a Doppler shift, and thereby determine a
plurality of velocity components of the tracer particles using
coherent detection.
Original languageEnglish
Patent numberWO2013092746
Filing date27/06/2013
CountryInternational Bureau of the World Intellectual Property Organization (WIPO)
Publication statusPublished - 2013

Bibliographical note

DTU reference no: 92641

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