New Laser Doppler Sensors for Spatial Velocity Information

Strunck, V.; Grosche, G.; Dopheide, D.

doi:10.1109/iciasf.1993.687679

Cited by 6 publications

(14 citation statements)

References 3 publications

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“…in order to resolve flow accelerations. Furthermore, sound waves have been evaluated by time-resolved Doppler frequency measurements [166][167][168].…”

Section: Highly Resolved Ldv Measurementsmentioning

confidence: 99%

“…In order to overcome the mentioned limitations, spatial resolving techniques were proposed [160,161,172,173], which are analogous to distributed sensing techniques. This makes it possible to resolve spatial measurands along optical fibres [174].…”

Section: Highly Resolved Ldv Measurementsmentioning

confidence: 99%

“…Challenges in the flow measurement of supersonic nozzles for smallscale spacecraft, in inkjet technology or in micro-fluidic devices for patient diagnostics (lab-on-a-chip) and drug delivery give a strong impulse to the development of optical measurement techniques. Besides the implementation of novel components, also new methods such as spatially resolved velocity measurements for the investigation of laminarturbulent transitions in boundary layers have been developed [25].…”

Section: Introductionmentioning

confidence: 99%

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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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“…in order to resolve flow accelerations. Furthermore, sound waves have been evaluated by time-resolved Doppler frequency measurements [166][167][168].…”

Section: Highly Resolved Ldv Measurementsmentioning

confidence: 99%

Section: Highly Resolved Ldv Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laser Doppler velocimetry using powerful solid-state light sources

Czarske

2006

Meas. Sci. Technol.

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“…The known Blasius velocity profile of laminar shear flows in flat plate boundary layers [1,3,10,11,20] allows us to study the performance of the spatially resolving profile sensor. Velocity profiles were evaluated along the y-axis for different x-positions of the measurement volume at the glass plate as well as for different free-stream velocities U ∞ .…”

Section: Blasius Boundary Layer Measurementsmentioning

confidence: 99%

“…A novel fundamental principle is to measure the velocity profile of a flow field within the measurement volume. Strunck et al [10,11] have presented a reference Doppler technique which achieves a spatial resolution of about 30 µm along the y-axis of the measurement volume of almost 6 mm length. Limitations of this principle are given by the reference Doppler technique.…”

Section: Introductionmentioning

confidence: 99%

Boundary layer velocity measurements by a laser Doppler profile sensor with micrometre spatial resolution

Czarske¹,

Büttner²,

Razik³

et al. 2002

Meas. Sci. Technol.

100

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We have developed a differential laser Doppler profile sensor for distributed one-component velocity measurements with high spatial resolution. Two Doppler frequencies are measured simultaneously in order to determine the position as well as the velocity of individual tracer particles passing through the measurement volume. In the centre of the measurement volume the obtained uncertainty of the position is about 1.6 µm. The profile measurement has the advantage that no mechanical scanning is needed to obtain flow velocity profiles over a length of 5 mm. The profile sensor thus provides a tool for highly resolved instantaneous measurements of shear flows, which have strong velocity gradients.

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