Results 251 to 260 of about 4,623,161 (291)

Inspection of CFRP components by ultrasonic imaging with air-coupling

Insight - Non-Destructive Testing and Condition Monitoring, 2004
This paper reports the investigations of air coupled ultrasonic imaging techniques which are part of the German research project MaTech. Project partners are Airbus, Bremen, Ingenieurburo Dr. Hillger, Braunschweig, and intelligeNDT, Erlangen, with DLR, Braunschweig, as subcontractor.
Hillger, Wolfgang, Meier, R., Henrich, R.   +2 more
openaire   +3 more sources

AIR-COUPLED LONG WAVES IN THE OCEAN

Journal of Meteorology, 1960
Abstract An IGY tsunami recorder at Texas Tower No. 4 off New York has detected ocean waves of periods from 4 to 10 min which have amplitudes up to 100 times greater than atmospheric pressure oscillations which occurred simultaneously. The latter are shown to be pressure perturbations generated by internal surface waves on a frontal discontinuity aloft.
William L. Donn, William T. McGuinness
openaire   +1 more source

Air-coupled ultrasonic scanner for Braille

2001 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.01CH37263), 2002
This work presents an air-coupled ultrasonic scanner to digitize Braille texts. Braille is a system of touch reading for the blind which employs embossed dots. Air-coupled focused piezoelectric transducers, for this particular application were designed, produced and characterized. A conventional 2D scan system for NDE applications was used.
T.E. Gomez, F. Montero de Espinosa, A.P. Pozas   +2 more
openaire   +1 more source

Air-Coupled Ultrasonic Applications of Ferroelectrets

Ferroelectrics, 2008
Improvement of ferroelectret transducers for air-coupled ultrasonic applications was demonstrated on the base of optimization of the ferroelectret electromechanical properties and adjustment of the ferroelectret transducers to the ultrasonic system. Controlled inflation of the polypropylene ferroelectret films results in an increase of the coupling ...
Viktor Bovtun, Joachim Döring, Michael Wegener, Jürgen Bartusch, Uve Beck, Anton Erhard, Vladimir Borisov   +6 more
openaire   +1 more source

A Study of Air-Coupled Ultrasonic Flowmeter

Volume 5: Fusion Engineering; Student Paper Competition; Design Basis and Beyond Design Basis Events; Simple and Combined Cycles, 2012
A new non-contact flow metering system is developed using air-coupled ultrasonic technique. The principle of the present system is based on the time-of-flight (TOF) ultrasonic flowmeter. The TOF ultrasonic flowmeter has two transducers, a transmitter and a receiver, which are strapped on the outside wall of a pipe.
Keisuke Tsukada, Tomonori Ihara, Hiroshige Kikura   +2 more
openaire   +1 more source

Air – coupled ultrasonic transducers with collimators

Ultrasound, 2009
Air – coupled planar ultrasonic transducers with collimators can be effectively used for a wide range of distances when air-coupled focussed transducers are being exploited only at the fixed distance. On the other hand use of attached collimators on the planar transducers allows choosing a relatively wide range of spatial resolutions, what is very ...
A. Vladišauskas, R. Raišutis, E. Žukauskas   +2 more
openaire   +1 more source

Novel Ultrasonic air Coupled Transducers

1999
Airborne ultrasound is currently used for a variety of applications, including distance ranging, level monitoring, broken ply detection and for the limited non-destructive testing of low Z materials (such as green-state ceramics, rubber and carbon fiber composite).
Billson, D., Hutchins, D., Ingleby, P., Robertson, T.   +3 more
openaire   +2 more sources

Air-Coupled Nondestructive Evaluation Dissected

Journal of Nondestructive Evaluation, 2018
This work develops a two-dimensional theoretical model to simulate the behavior of a fully non-contact air-coupled nondestructive evaluation system for a thin isotropic plate. The model is divided into transmission, guided wave propagation and reception phase.
Mohammad Said Harb, Fuh-Gwo Yuan
openaire   +1 more source

Wideband air – coupled ultrasonic transducers

Ultrasound, 2004
Wideband air – coupled ultrasonic transducers.
R. Kažys, A. Vladišauskas, E. Žukauskas   +2 more
openaire   +1 more source

Characterization of mineral paper by air-coupled ultrasonic spectroscopy

Ultrasonics, 2012
A novel technology in the paper industry makes possible to produce paper by using a mineral powder and a polymer instead of cellulose fibers. This new product is called mineral paper, it presents some potential environmental advantages compared with conventional paper, while it exhibit a similar appearance and properties. The purpose of this work is to
T E, Gómez Álvarez-Arenas, D A, Soto
openaire   +2 more sources