Making sound visible—a simple schlieren imaging setup for schools

AbstractThere is a long-lasting debate about the possible functions of zebra stripes. According to one hypothesis, periodical convective air eddies form over sunlit zebra stripes which cool the body. However, the formation of such eddies has not been experimentally studied. Using schlieren imaging in the laboratory, we found: downwelling air streams do not form above the white stripes of light-heated smooth or hairy striped surfaces. The influence of stripes on the air stream formation (facilitating upwelling streams and hindering horizontal stream drift) is negligible higher than 1–2 cm above the surface. In calm weather, upwelling air streams might form above sunlit zebra stripes, however they are blown off by the weakest wind, or even by the slowest movement of the zebra. These results forcefully contradict the thermoregulation hypothesis involving air eddies.

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Experimental Qualification of a Novel X-Ray Diffraction Imaging Setup Based on Polycapillary X-Ray Optics

IEEE Transactions on Nuclear Science ◽

10.1109/tns.2010.2057517 ◽

2010 ◽

Vol 57 (5) ◽

pp. 2564-2570 ◽

Cited By ~ 7

Author(s):

A. Castoldi ◽

C. Ozkan ◽

C. Guazzoni ◽

A. Bjeoumikhov ◽

R. Hartmann

Keyword(s):

X Ray Diffraction ◽

Ray Optics ◽

X Ray ◽

Diffraction Imaging ◽

Imaging Setup

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Schlieren imaging of inverted domains in congruent lithium niobate

CLEO/Europe. 2005 Conference on Lasers and Electro-Optics Europe, 2005. ◽

10.1109/cleoe.2005.1568056 ◽

2006 ◽

Author(s):

M. Paturzo ◽

P. Ferraro ◽

S. Grilli ◽

P. De Natale ◽

S. De Nicola ◽

...

Keyword(s):

Lithium Niobate ◽

Schlieren Imaging ◽

Congruent Lithium Niobate

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Portable real-time THz imaging setup based on QC lasers

10.1117/12.908569 ◽

2012 ◽

Author(s):

Christopher Bonzon ◽

Giacomo Scalari ◽

Maria I. Amanti ◽

Fabrizio Castellano ◽

Dana Turcinkova ◽

...

Keyword(s):

Real Time ◽

Thz Imaging ◽

Imaging Setup

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Tomographic Schlieren imaging for measurement of beam pressure and intensity

Proceedings of IEEE Ultrasonics Symposium ULTSYM-94 ◽

10.1109/ultsym.1994.401910 ◽

1994 ◽

Cited By ~ 11

Author(s):

Pitts ◽

Greenleaf ◽

Jian-Yu Lu ◽

Kinnick

Keyword(s):

Schlieren Imaging

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Magneto-optical imaging setup for single vortex observation

Review of Scientific Instruments ◽

10.1063/1.1525875 ◽

2003 ◽

Vol 74 (1) ◽

pp. 141-146 ◽

Cited By ~ 57

Author(s):

P. E. Goa ◽

H. Hauglin ◽

Å. A. F. Olsen ◽

M. Baziljevich ◽

T. H. Johansen

Keyword(s):

Optical Imaging ◽

Single Vortex ◽

Imaging Setup

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Utilizing Schlieren Imaging to Visualize Heat Transfer Studies

Volume 5: Education and Globalization ◽

10.1115/imece2014-38329 ◽

2014 ◽

Cited By ~ 1

Author(s):

Jacob C. Kaessinger ◽

Kramer C. Kors ◽

Jordan S. Lum ◽

Heather E. Dillon ◽

Shannon K. Mayer

Keyword(s):

Heat Transfer ◽

Undergraduate Students ◽

Cfd Simulation ◽

Stokes Equations ◽

Imaging System ◽

Empirical Science ◽

Navier Stokes ◽

Schlieren Imaging ◽

Navier Stokes Equations ◽

Imaging Device

Convective heat transfer beyond explicit solutions to the Navier Stokes equations is often an empirical science. Schlieren imaging is one of the only fluid imaging systems that can directly visualize the density gradients of a fluid using collimated light and refractive properties. The ability to visualize fluid densities is useful in both research and educational fields. A Schlieren imaging device has been constructed by undergraduate students at the University of Portland. The device is used for professorial heat transfer and fluid dynamics research and to help undergraduates visualize and understand natural convection. This paper documents the design decisions, design process, and the final specifications of the Schlieren system. A simple 2-D heated cylindrical model is considered and evaluated using Schlieren imaging, OpenFOAM C.F.D. simulation, and convection analysis using a Nusselt correlation. Results are presented for the three analysis techniques and show excellent verifications between the CFD simulation, Nusselt correlation, and Schlieren imaging system.

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Schlieren Imaging: Optical Techniques to Visualize Thermal Interactions with Biological Tissues

Handbook of Physics in Medicine and Biology ◽

10.1201/9781420075250-45 ◽

2010 ◽

pp. 449-458

Keyword(s):

Biological Tissues ◽

Schlieren Imaging ◽

Optical Techniques

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Development of a Neutron Imaging Station at the n_TOF Facility of CERN and Applications to Beam Intercepting Devices

Instruments ◽

10.3390/instruments3020032 ◽

2019 ◽

Vol 3 (2) ◽

pp. 32 ◽

Cited By ~ 1

Author(s):

Federica Mingrone ◽

Marco Calviani ◽

Claudio Torregrosa Martin ◽

Oliver Aberle ◽

Michael Bacak ◽

...

Keyword(s):

Neutron Beam ◽

Neutron Radiography ◽

Beam Line ◽

Neutron Imaging ◽

Experimental Results ◽

Detection Systems ◽

Experimental Area ◽

Shortest Distance ◽

Antiproton Production ◽

Imaging Setup

A neutron radiography testing station has been developed exploiting the neutron beam of CERN’s n_TOF Experimental Area 2, located at the shortest distance to the neutron producing-target. The characteristics of the n_TOF neutron beam for the imaging setup are presented in this paper, together with the obtained experimental results. The results focused on the testing of several particle producing targets, including a spent antiproton production targets as well as targets from two different HiRadMat’s experiments. The possible developments of neutron imaging capabilities of the n_TOF facility in terms of detection-systems and beam-line upgrades are as well outlined.

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