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Optical Fiber Sensor Technology pp 261–301Cite as

Fiber optic laser anemometry

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Part of the book series: Optoelectronics, Imaging and Sensing ((OISS,volume 2))

Abstract

Laser anemometry (LA) is a technique that measures flow velocity distributions and higher moments such as turbulence levels, from light scattered by particles entrained in the flow [1–3]. LA was first demonstrated shortly after the invention of the laser, and quickly established itself as the instrument of choice for nonintrusive flow measurement. Early LA systems were generally large, bulky and difficult to use in inaccessible environments. The introduction of optical fibers led to the development of optical systems remotely linked to the laser source and detectors. Optical fibers are now used in a number of commercial laser anemometers, and other optical instrumentation. More recently solid state lasers and detectors have been combined with optical fiber technology to implement compact, robust multi-velocity component measurement instruments. This chapter reviews the principles of laser transit anemometry (LTA) and laser Doppler velocimetry (LDV), the optical fiber characteristics required to implement practical systems and optical signal-processing techniques employed. This is followed by a discussion of fiber optic implementations of LTA and LDV configurations, multiplexing techniques for multi-velocity component measurement and examples of applications in which they have been used.

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  1. S. W. James
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Editors and Affiliations

  1. Department of Electrical, Electronic and Information Engineering, City University, London, UK

    K. T. V. Grattan (Professor of Measurement and Instrumentation Head) & B. T. Meggitt (Visiting Professor) (Professor of Measurement and Instrumentation Head) &  (Visiting Professor)

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James, S.W., Tatam, R.P. (1998). Fiber optic laser anemometry. In: Grattan, K.T.V., Meggitt, B.T. (eds) Optical Fiber Sensor Technology. Optoelectronics, Imaging and Sensing, vol 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5787-6_8

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