3-component-Doppler-laser-2-focus: a new kind of three component velocimeter

Roehle, I.; Karpinsky, G.; Schodl, R.

doi:10.1109/iciasf.1999.827152

Cited by 2 publications

(4 citation statements)

References 1 publication

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“…A combined L2F and molecular filter-based instrument was reported by Roehle et al [134]. This configuration, shown in figure 47, used a L2F probe to measure the two components of the flow vector in the plane normal to the optical axis and the Doppler shift from scattered light to determine the axial component.…”

Section: Other Time-of-flight Probesmentioning

confidence: 99%

“…Both pulses were then detected using a single photodetector and the Doppler shift and hence axial velocity could then be found from the ratio of light transmitted through the iodine cell to the reference signal provided by the optical delay line. This technique has the advantage of reduced optical access requirements [134], needing only around 11 • solid angle of access compared to around 20-25 • for the 3D-L2F system described in [40]. Louge et al [135] describe an optical fibre time-of-flight probe designed to undertake measurements in dense gas-solid suspensions such as fluidized beds and pneumatic transport.…”

Section: Other Time-of-flight Probesmentioning

confidence: 99%

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Optical fibre laser velocimetry: a review

Charrett

James

Tatam

2012

Meas. Sci. Technol.

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The applications of optical fibre technology to laser velocimetry are diverse and often critical to their successful implementation, particularly in harsh environments. Applications range from the use of optical fibres for beam delivery and scattered light collection, aiding the miniaturization of instrument probes, to the use of imaging fibre bundles for imaging the flow field in planar velocimetry systems. Optical fibre techniques have also been used in signal processing, for example fibre frequency shifters, and optical fibre devices such as amplifiers and lasers have been exploited. This paper will review the use of optical fibres in point-wise laser velocimetry techniques such as laser Doppler velocimetry and laser transit anemometry, as well as in planar measurement techniques such as particle imaging velocimetry and planar Doppler velocimetry.

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Section: Other Time-of-flight Probesmentioning

confidence: 99%

Section: Other Time-of-flight Probesmentioning

confidence: 99%

Optical fibre laser velocimetry: a review

Charrett

James

Tatam

2012

Meas. Sci. Technol.

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Section: Scattering Particlementioning

confidence: 99%

“…Particle velocity(V) component [13][14][15][16]. Optical configurations to measure the onaxis velocity component using limited optical access remain the subject of research [2,9,[13][14][15][16][17][18]. This paper investigates an in-line laser Doppler velocimeter based on the use of a Bragg grating Fabry-Perot (FP) interferometric filter to measure the Doppler frequency shift.…”

Section: Scattering Particlementioning

confidence: 99%

In-line laser Doppler velocimeter using fibre-optic Bragg grating interferometric filters

Chehura¹,

Ye²,

Tatam³

2003

Meas. Sci. Technol.

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An all fibre-based laser Doppler velocimetry system for the measurement of the predominantly on-axis component of velocity is presented. The technique employs Bragg grating-based Fabry-Perot interferometric filters custom-designed to suit the transduction of Doppler optical frequency shifts to intensity. The sensitivity of the in-fibre filters to strain is exploited to provide tuning of the filter relative to the centre wavelength of the laser and of the spectral shape of the filter, which in turn varies the velocity range, sensitivity and resolution. A phase-locking scheme incorporated to stabilize the filter is described together with a laser-wavelength stabilization system that locks to a Doppler-broadened absorption line of iodine vapour. An optical fibre-linked probe head is used to couple the laser beam at 514.5 nm to and from the measurement volume. The velocimeter is characterized by measuring the velocity of a rotating disc over ranges of ±42 and ±7 m s −1 with a resolution of 0.2 m s −1 .

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3-component-Doppler-laser-2-focus: a new kind of three component velocimeter

Cited by 2 publications

References 1 publication

Optical fibre laser velocimetry: a review

Optical fibre laser velocimetry: a review

In-line laser Doppler velocimeter using fibre-optic Bragg grating interferometric filters

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