Invited Speakers

 - Dr. Tomas Gomez Alvarez-Arenas
 - Dr. Liudas Mazeika

Tomas Gomez Alvarez-Arenas

Dr. Tomas Gomez Alvarez-Arenas (Spanish National Research Council, Spain)

Ultrasonic Transducers for Operation in Air: Technologies, Applications and Future Trends

Monday, 19th June, 10:15–11:00, Room A

Dr. Tomas Gomez Alvarez-Arenas is the chief of the Sensors and Ultrasonic Systems Department of the Institute of Physical and Information Technologies (ITEFI, and researcher at Spanish National Research Council (CSIC,

Technologies that make possible to send and receive ultrasonic signals to and from the air with a given centre frequency, frequency bandwidth, sensitivity and field geometry are a key component in many different applications. Distance measurements, echolocation, artificial vision, human-machine contactless interfaces and gesture recognition systems, wireless and secure communications, wireless energy transfer, non-destructive evaluation of advanced materials, fully contactless analysis of art objects, fully non-invasive quality control of food stuff, determination of water needs of plants for efficient and precision agriculture, etc.

Ultrasonic transducers permit us to convert electrical signals into ultrasound waves and vice versa. The design and fabrication of efficient air-coupled transducers is one of the most challenging problems in this field. Two different transduction mechanism are currently used based on either the piezoelectric or the electrostrictive effect. Piezoelectric transducers use to be resonant devices where resonances appear in the piezoelectric element itself (>100 kHz) or in passive structures (< 100 kHz). Electrostrictive transducers are nowadays fabricated using microfabrication techniques (CMUT – capacitive micromachined transducers) that also allow to integrate the electronics. This talk will address the main transduction technologies available and their applications: possibilities, limitations, solutions and future trends.

Dr. Liudas Mazeika

Prof. Dr. Liudas Mazeika (Prof. K. Barsauskas Ultrasound Research Institute, Lithuania)

Ultrasonic Measurements: Trends, Problems, Solutions

Monday, 19th June, 11:45-12:30, Room A

The importance of various measurements is growing mainly due to development of automatic technologies, and the need of safe exploitation of dangerous and complex objects. The ultrasonic waves are one of the means to penetrate into or through various materials thus enable the estimation of internal properties, or structure of the object. On the other hand, they are not dangerous for humans in contrary to X-rays or other similar methods. The ultrasonic waves are used in industry for evaluation of material properties and especially for detection of the defects in various components. The ultrasonic measurements seem to be simple, however, they combine many braches of science such as mathematics, physics, electronics, signal processing, materials science and informatics. The talk will start with a brief presentation of ultrasonic measurements in general and putting accents to complexity and solution of the problems. The recent trends in the development of ultrasonic techniques will be presented later and illustrated by multiple examples of applications in various fields of industries such as power plants, aerospace, plastic manufacturing. The advanced signal processing techniques used in ultrasonic measurements and imaging will be discussed as well.