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Focusing of ferroelectret air-coupled ultrasound transducers
AIP Conference Proceedings, 2016 Air-coupled ultrasound has been applied increasingly as a non-destructive testing method for lightweight construction in recent years. It is particularly appropriate for composite materials being used in automotive and aviation industry. Air-coupled ultrasound transducers mostly consist of piezoelectric materials and matching layers.
Mate Gaal +4 more
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Passive Focusing Techniques for Piezoelectric Air-Coupled Ultrasonic Transducers
Ultrasonics, 2016This paper proposes a novel passive focusing system for Air-Coupled Ultrasonic (ACU) piezoelectric transducers which is inspired by the Newtonian-Cassegrain (NC) telescope concept. It consist of a primary spherical mirror with an output hole and a flat secondary mirror, normal to the propagation axis, that is the transducer surface itself.
Jorge Camacho +1 more
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Air-coupled ultrasonic capacitance transducers for NDT
The characteristics of air-coupled ultrasonic capacitance transducers have been determined for a of transducer configurations. The pressure field of a wide bandwidth silicon backplate capacitance transducer has been scanned in air, and compared to theory based on a plane piston approach. New devices have been fabricated, using laser-machined backplates.
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Advances in Air-Coupled Ultrasonic Transducers
Nondestructive Testing and Evaluation, 1995exaly +2 more sources
Calibration of Air-Coupled Ultrasonic Transducers
2021 IEEE International Ultrasonics Symposium (IUS), 2021Air-coupled ultrasonic transducers working at frequencies over 100 kHz have been widely used in the past for NDT applications and are a very attractive alternative when test specimens cannot enter in contact with water. In these cases, and in order to determine transducer performance it is sufficient to measure transducer two-way insertion loss and ...
Julio Quirce +2 more
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Wideband characterisation of air coupled transducers
Proceedings of IEEE Ultrasonics Symposium ULTSYM-94, 1994This paper describes a theoretical and experimental study on the use of wideband piezopolymer transducers (PVDF) for the determination of the through-air system impulse response, in both transmission and reception. A linear systems model was used to design a PVDF transmitter/receiver possessing a unipolar, planar and wideband impulse response for ...
Gachagan, Anthony +2 more
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Air – coupled ultrasonic transducers with collimators
Ultrasound, 2009Air – 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 +2 more
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Wideband air – coupled ultrasonic transducers
Ultrasound, 2004Wideband air – coupled ultrasonic transducers.
R. Kažys +2 more
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A conical air-coupled capacitance transducer for surface imaging
Ultrasonics, 2003This paper describes the construction and operation of an air-coupled capacitance transducer with a conical backplate. This was designed to produce a focal region over an extended distance along the transducer axis. Measurements were performed to examine both the frequency response of the transducer in pulse-echo mode, and the lateral resolution for ...
D A, Hutchins +3 more
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NDE applications of air-coupled ultrasonic transducers
1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium, 2002In recent years, several new NDE applications of air-coupled, as opposed to liquid-coupled, ultrasonics have been seriously pursued. The applications range from through transmission testing of aerospace laminates and various honeycomb or foam filled materials, and solar cells, to pulse-echo flaw detection in plastic electronic packaging materials and ...
W.A. Grandia, C.M. Fortunko
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