Simultaneous measurement of velocity and particle size profiles with the reference beam technique

Borys, Michael; Strunck, V.; Müller, H.; Dopheide, D.

doi:10.1007/978-3-662-08263-8_15

Cited by 5 publications

(12 citation statements)

References 11 publications

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“…Furthermore, the acquisition of two widely separated burst signals requires a large memory capacity for the signal processing technique. An alternative reference Doppler technique for the localization of the particle trajectory has been demonstrated with the evaluation of the spatial frequency in the interference pattern of the reference laser beam [15]. The position is determined by the phase difference of two detected burst signals.…”

Section: -Profile Sensormentioning

confidence: 99%

“…The position is determined by the phase difference of two detected burst signals. The spatial resolution was estimated to be about 30 µm for a measurement range of 10mm [15]. However, both arrangements require forward-scattered light [12,15], which usually requires detached receiving optics, implying a complicated adjustment.…”

Section: -Profile Sensormentioning

confidence: 99%

“…The spatial resolution was estimated to be about 30 µm for a measurement range of 10mm [15]. However, both arrangements require forward-scattered light [12,15], which usually requires detached receiving optics, implying a complicated adjustment. In order to realize a back-scattering receiving optic, the use of retro-reflectors has been proposed [13], but this is only possible in some flow arrangements.…”

Section: -Profile Sensormentioning

confidence: 99%

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Measurement of velocity gradients in boundary layers by a spatially resolving laser Doppler sensor

et al. 2001

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A novel laser Doppler technique is presented to measure flow fields with micro-scale resolution. The realized laser Doppler sensor provides distributed velocity measurements inside a defined measurement volume. Two laser wavelengths are used to accomplish two Doppler frequency measurements, which determine the position and the velocity of a scattering particle. Repeating of these measurements determines the velocity gradient of the flow. One application area is the evaluation of the velocity variations in boundary layers of flows close to a wall. This contribution presents the principle and experimental results of the spatially resolving laser Doppler velocity sensor. Different concepts on the optical arrangements as well as the signal processing technique are discussed. A scheme for the construction of a miniaturized fiber-coupled sensor is presented, which allows its integration into flow channels.

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Section: -Profile Sensormentioning

confidence: 99%

Section: -Profile Sensormentioning

confidence: 99%

Section: -Profile Sensormentioning

confidence: 99%

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Measurement of velocity gradients in boundary layers by a spatially resolving laser Doppler sensor

et al. 2001

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“…This makes it possible to resolve spatial measurands along optical fibres [174]. Inside the measurement volume, the position as well as the velocity of individual tracers is measured by the profile sensor [25,160,161,172,173,[175][176][177]. The velocity profile of the flow is sampled by tracers.…”

Section: Highly Resolved Ldv Measurementsmentioning

confidence: 99%

“…Highly resolved analysis of two-phase flows, e.g. of sprays, can be accomplished by means of a profile PDA sensor [177].…”

Section: Highly Resolved Ldv Measurementsmentioning

confidence: 99%

Laser Doppler velocimetry using powerful solid-state light sources

Czarske

2006

Meas. Sci. Technol.

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Opto-electronic measurement techniques are well established in fluid flow investigations. Their advantages are that they are non-intrusive, provide highly accurate measurement data and have fast response times. Laser Doppler velocimetry (LDV) is one of the most important methods for velocity measurements with high spatial and temporal resolution. Diode lasers and diode-pumped solid-state lasers as well as glass fibres and micro-optics are employed to an increasing extent. Particularly, the development of solid-state lasers proceeds rapidly. New lasers with improved properties such as high-power fundamental-mode emission make it possible to develop enhanced LDV sensor heads. This may open up new fields of application, for example in medicine and aerospace technology. The aim of this review is to describe the present state-of-the-art in LDV and to demonstrate how new laser concepts can still contribute to the development of new, improved LDV sensors. For that purpose, solid-state lasers such as diode lasers and diode-pumped solid-state lasers are introduced, and concepts of communication engineering for accomplishing directional multi-component velocity measurements are discussed. Also, velocity measurements with high spatial resolution are reported. A conclusive overview of applications and an outlook on future challenges are outlined.

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