Fiber optic laser anemometry

James, Stephen W.; Tatam, Ralph P.

doi:10.1007/978-1-4615-5787-6_8

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2003

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(2 citation statements)

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“…These include the stringent requirements on the alignment [21], polarization matching of the signal and reference beams and a limited collection aperture. The use of optical fibres has been shown to overcome many of these problems [14,18,[22][23][24]. The Doppler difference technique involves the interference of two mutually coherent beams to create a fringe pattern in the measurement volume.…”

Section: Theorymentioning

confidence: 99%

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A single-headed fibre optic laser Doppler anemometer probe for the measurement of flow angles

Byrne¹,

James²,

Tatam³

2003

Meas. Sci. Technol.

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A single-headed fibre optic laser Doppler anemometer capable of measuring the angle of a flow is presented. The instrument relies upon the use of birefringent optical fibre and is configured to measure the three orthogonal velocity components, from which the flow angles are calculated, using two Doppler difference channels and one reference beam channel. The design of the probe head permits accurate measurement of the Cartesian velocity components, enabling measurement of the two angles used to define the flow with typical errors of ±1 • and ±3 • .

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Section: Theorymentioning

confidence: 99%

“…This requires three separate measurement channels. In applications where optical access is readily available two separate Doppler difference probe heads are usually employed [14]. However, in applications where optical access is restricted, for example measurements within turbomachinery, a single probe head is required [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%