Flow velocities visualization using Doppler picture interference velocimetry

Seiler, F.; George, A.; Leopold, Friedrich; Srulijes, J.; Smeets, G.

doi:10.1109/iciasf.1999.827150

Cited by 3 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using Eqs. (8) and (9), it can be seen that the number of channels required for the FDM noise to be equal to or less than that of using sequential recording and that for frame averaging the number of channels can be found from…”

Section: A Camera Dynamic Rangementioning

confidence: 99%

“…Interferometric planar Doppler velocimetry (I-PDV) describes a group of techniques (Doppler picture velocimetry [8][9][10], Mach-Zehnder interferometric PDV [11,12], and near-resonant interferometry [13,14]) that use optical interferometry to make planar velocity measurements and attempt to overcome some of the limitations of molecularfilter-based PDV. In I-PDV, the molecular filter is replaced with a path-length imbalanced interferometer, and the Doppler-shifted light causes a change in the light intensity distribution in the recorded interference pattern.…”

Section: Introductionmentioning

confidence: 99%

“…The magnitude of this change is proportional to the flow velocity and the path-length imbalance in the interferometer. I-PDV has been used for both flow visualization [8] and quantitative velocity measurements [11][12][13][14][15] by evaluating the interferometric phase change that occurs when the light is Doppler frequency shifted. The relationship between the Doppler frequency shift, Δν, the optical path length imbalance, Δl, and the change in the phase difference Δϕ is given by…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Frequency division multiplexing for interferometric planar Doppler velocimetry

et al. 2014

View full text Add to dashboard Cite

A new method of acquiring simultaneously the signal and reference channels used for interferometric planar Doppler velocimetry is proposed and demonstrated. The technique uses frequency division multiplexing (FDM) to facilitate the capture of the requisite images on a single camera, and is suitable for time-averaged flow measurements. Furthermore, the approach has the potential to be expanded to allow the multiplexing of additional measurement channels for multicomponent velocity measurement. The use of FDM for interferometric referencing is demonstrated experimentally with measurements of a single velocity component of a seeded axisymmetric air jet. The expansion of the technique to include multiple velocity components was then investigated theoretically and experimentally to account for bandwidth, crosstalk, and dynamic range limitations. The technique offers reduced camera noise, automatic background light suppression, and crosstalk levels of typically <10%. Furthermore, as this crosstalk is dependent upon the channel modulations applied, it can be corrected for in postprocessing.

show abstract

Section: A Camera Dynamic Rangementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Frequency division multiplexing for interferometric planar Doppler velocimetry

et al. 2014

View full text Add to dashboard Cite

show abstract

“…This method, called Doppler Picture Velocimetry (DPV), was further developed during recent years (Seiler et al, 1987;1991, 1998 and the actual status of the DPV set-up and the technique for processing the interference image of the Doppler picture will be described herein. Some details on the progress in image processing have already been described by Seiler et al (1999) and Leopold et al (2000).…”

Section: Introductionmentioning

confidence: 97%

Planar velocity visualization in high-speed wedge flow using Doppler Picture Velocimetry (DPV) compared with Particle Image Velocimetry (PIV)

Seiler

Havermann

George

et al. 2003

J Vis

Self Cite

View full text Add to dashboard Cite

Ab ract : A technique for visualizing a velocity field in an entire plane has been developed by taking "Doppler Pictures" using Michelson interferometry. With the Doppler Picture Velocimetry (DPV), information about the instantaneous and local velocities of tracers passing through a light sheet is available. The technique for taking and processing the Doppler pictures has been improved recently and the state-of-the-art of the DPV method will be described with an application in high-speed fluid flows showing the velocity distribution in a light sheet plane crossing a supersonic wedge flow generated in the high-energy shock tunnel STB of ISL. A comparison with Particle Image Velocimetry (PIV) velocity visualizations is also presented. st

show abstract

“…The magnitude of the change in the fringe pattern is proportional to the flow velocity and the path imbalance in the interferometer. For planar velocity measurements Michelson interferometer configurations have been used previously [7][8][9][10][11]. Michelson interferometers have many advantages for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Three-component planar velocity measurements using Mach–Zehnder interferometric filter-based planar Doppler velocimetry (MZI-PDV)

Lu¹,

Charrett²,

Tatam³

2009

Meas. Sci. Technol.

View full text Add to dashboard Cite

Interferometric filter-based planar Doppler velocimetry is used in conjunction with imaging fibre bundles to make time-averaged three-component velocity measurements using a single imaging head. The Doppler frequency shifts of light scattered by particles entrained into the flow to be measured are transduced to intensity variations using a Mach–Zehnder interferometer. The free spectral range of the filter can be selected by adjusting the optical path difference of the interferometer. This allows the velocity measurement range, sensitivity and resolution to be varied. Three-component measurements are made possible by porting different views of the measurement plane to a single imaging head using the imaging fibre bundles. A comparison of three different image-processing techniques is presented and analysed with the aid of modelled images. Results are presented here for time-averaged measurements of a rotating disc with maximum velocities of ∼ ±34 m s−1 in the field of view with the computed measurement error in the orthogonal velocity components being (0.89, 0.68, 1.42) m s−1 for the measurement geometry used. Three-component velocity measurements were also made on a seeded air jet with a nozzle diameter of 20 mm and an exit velocity of ∼85 m s−1.

show abstract

Flow velocities visualization using Doppler picture interference velocimetry

Cited by 3 publications

References 2 publications

Frequency division multiplexing for interferometric planar Doppler velocimetry

Frequency division multiplexing for interferometric planar Doppler velocimetry

Planar velocity visualization in high-speed wedge flow using Doppler Picture Velocimetry (DPV) compared with Particle Image Velocimetry (PIV)

Three-component planar velocity measurements using Mach–Zehnder interferometric filter-based planar Doppler velocimetry (MZI-PDV)

Contact Info

Product

Resources

About