Naslov
Design For Purpose of Ultrasonic Sensor for Buried Object Materials Characterisation

Autori
Stepanić, Josip ; Korošak, Dean ; Cvikl, Bruno ; Markučič, Damir

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
NDT - Competence & Safety / Krstelj, Vjera - Zagreb : HDKBR, 2004, 172-176

Skup
MATEST 2004

Mjesto i datum
Zagreb, Hrvatska, 14.10.2004. - 16.10.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
humanitarian demining; ultrasound; materials characterisation; deposition

Sažetak
Ultrasonic sensor improves confirmation capability of the buried object detection using hand probe. Different parts of the sensor, e.g., matching layers, piezoelectric specimen, electrodes etc. should all be considered explicitly to realise the optimal confirmation capability. In this paper we consider the contribution of the configuration of electrodes to the spatial distribution of the pressure field of ultrasonic sensor located within the hand-probe tip. The fixing of the parameters of the geometry of the electrodes is performed following the purpose of the system. Appropriate transfer of the ultrasound pulse is essential for the ultrasound based materials characterization. In the appropriate set-up, the ultrasonic pulse transfer is realized as the pulse’ s propagation from the transducer to the buried object to be characterized, and back to transducer again. The signal received is a complex combination of characteristics of both the transfer entity and the characterized object [1 – 3]. Therefore, the transfer entity influence of the ultrasonic pulse should be known in order to enable one to use the ultrasound for buried object materials characterization. That influence could be modelled and the object containing transfer medium appropriately designed. The recently proposed sensing configuration in which piezoelectric specimens of non-conventional shape are integrated in the hand-probe is presented. We show the manufacturing of the first generation sensors, and characterisation of the corresponding ultrasonic fields in space-time-intensity co-ordinates. Specifically, the details of the Ionised Cluster Beam deposition technique [4] that has been employed in order to achieve the desired novel geometrical shapes of the piezoelectrical sensors is presented and discussed.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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