The fibre-optic Doppler anemometer

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The fibre-optic Doppler anemometer

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© The Institution of Electrical Engineers
Published

A laser Doppler anemometer is described in which an optical fibre is used to transmit the light to and from the measurement zone. An account is given of the various types of measurement that have been made with the instrument, particularly those involving Brownian motion. An analysis is made of backscattering into a fibre which shows that the back-scattered power is confined to a region extending only a few tens of core diameters from the fibre end.

Inspec keywords: fibre optics; anemometers; laser velocimeters

Other keywords: Brownian motion; fibre optic Doppler anemometer; laser Doppler anemometer; operation

Subjects: Other instrumentation and measurement systems; Fibre optics and fibre waveguides; Velocity, acceleration and rotation measurement; Fibre optics; Laser applications; Measurement instrumentation and techniques for fluid dynamics

References

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      • T. Tanaka , G.B. Benedek . Measurement of the velocity of blood flow (in vivo) using a fibre optic catheter and optical spectroscopy. Appl. Opt. , 189 - 196
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      • D.A. Ross , H.S. Dhadwal , R.B. Dyott . The determination of the mean and standard deviation of the size distribution of a suspension of sub-micron particles using the fibre optic doppler anemometer - FODA. J. Colloid & Interface Sci.
    3. 3)
      • N.A. Clark , J.H. Lunacek , G.B. Benedek . A study of Brownian motion using light scattering. Am. J. Phys. , 575 - 585
    4. 4)
      • M.A. Hudson . Calculation of the maximum optical coupling efficiency into multimode optical waveguides. Appl. Opt. , 1029 - 1033
    5. 5)
      • Einstein, A.: Investigations on the theory of Brownian move.
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