scholarly journals Berührungslose Messung des lokalen Schalldrucks mittels Hochgeschwindigkeits-Holographie / Non-invasive measurement of the local sound pressure using high-speed holography

2018 ◽  
Vol 85 (s1) ◽  
pp. s2-s6
Author(s):  
Andrés Eduardo Ramos Ruiz ◽  
Johannes Gürtler ◽  
Robert Kuschmierz ◽  
Jürgen Czarske
Keyword(s):  
High Speed ◽  
Sound Pressure ◽  
Non Invasive ◽  
Local Sound ◽  
Invasive Measurement

Zusammenfassung Für die Lärmreduzierung von Flugzeugtriebwerken kommen perforierte Bleche mit dahinterliegender Kavität (sogenannte Liner) zum Einsatz. Das aeroakustische Dämpfungsprinzip dieser Elemente beruht auf der Wechselwirkung von Schall und Strömung. Bisherige physikalische Modelle der Dämpfungsprozesse erlauben jedoch nicht die notwendige Entwicklung effizienterer Liner, da die aeroakustische Wechselwirkung noch nicht vollständig verstanden ist. Daher ist die Kenntnis relevanter Größen, wie die lokale Schalldruckverteilung, entscheidend für das Verständnis der lokalen Dämpfungsprozesse. Dazu präsentieren wir ein kamerabasiertes Messsystem für die zweidimensionale nicht-invasive ortsaufgelöste Schalldruckbestimmung.

scholarly journals Measurement of the Local Sound Pressure on a Bias-Flow Liner Using High-Speed Holography and Tomographic Reconstruction

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 153466-153474 ◽  
Author(s):  
Andres E. Ramos Ruiz ◽  
Johannes Gurtler ◽  
Robert Kuschmierz ◽  
Jurgen W. Czarske
Keyword(s):  
High Speed ◽  
Sound Pressure ◽  
Tomographic Reconstruction ◽  
Bias Flow ◽  
Local Sound

High-speed non-invasive measurement of tibial rotation during the impact phase of running

Ergonomics ◽  
2005 ◽  
Vol 48 (11-14) ◽  
pp. 1623-1637 ◽  
Author(s):  
C. J. Digby ◽  
M. J. Lake ◽  
A. Lees
Keyword(s):  
High Speed ◽  
Tibial Rotation ◽  
Non Invasive ◽  
Impact Phase ◽  
The Impact ◽  
Invasive Measurement

scholarly journals Non-invasive measurement of choroidal volume change and ocular rigidity through automated segmentation of high-speed OCT imaging

2015 ◽  
Vol 6 (5) ◽  
pp. 1694 ◽  
Author(s):  
L. Beaton ◽  
J. Mazzaferri ◽  
F. Lalonde ◽  
M. Hidalgo-Aguirre ◽  
D. Descovich ◽  
...  
Keyword(s):  
Volume Change ◽  
High Speed ◽  
Automated Segmentation ◽  
Non Invasive ◽  
Oct Imaging ◽  
Choroidal Volume ◽  
Invasive Measurement

Non-Invasive Displacement Measurement of Lightweight Structures Under Dynamic Excitations

2014 ◽  
Author(s):  
Lubos Kotek ◽  
Michal Holub ◽  
Jan Vetiska ◽  
Zdenek Hadas ◽  
Petr Blecha
Keyword(s):  
Wireless Sensors ◽  
High Speed ◽  
Energy Harvester ◽  
Vibration Energy ◽  
Mechanical Vibrations ◽  
Vibration Energy Harvester ◽  
Lightweight Structures ◽  
Non Invasive ◽  
Electro Magnetic ◽  
Invasive Measurement

The present article deals with the processing of data obtained by non-invasive measurement methods of instantaneous displacement of lightweight structures. This data is necessary to evaluate tuning-up of characteristics of an electro-magnetic vibration energy harvester, which is used for energy harvesting from these ambient mechanical vibrations. The electro-magnetic vibration energy harvester is device for powering of low power consumption wireless sensors without any external source of energy. The primary source of energy is only mechanical vibrations in place of wireless sensor and the operation without primary batteries is required. These techniques of wireless measurement are commonly used in aeronautics applications. The knowledge of mechanical vibrations in place of wireless sensors with vibration energy harvester is used for development of vibration energy harvester design. The major idea is to verify the use of non-invasive measurement using high-speed cameras with measurement obtained from the laser interferometer. The measurement using high-speed camera can provide very important information about resonance operation of the vibration energy harvester during the future development.

Non-invasive measurement of a fermentation pattern shift in infants during the first three months of life

2001 ◽  
Vol 120 (5) ◽  
pp. A266-A266
Author(s):  
R BUTLER ◽  
B ZACHARAKIS ◽  
D MOORE ◽  
K CRAWFORD ◽  
G DAVIDSON ◽  
...  
Keyword(s):  
Non Invasive ◽  
Fermentation Pattern ◽  
Invasive Measurement
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