Ultrasonic in-line sensors for inclusion detection in liquid metals

Author

Ihara, Ikuo ; Burhan, Dikky ; Aso, Hiroshi ; Kamado, Shigeharu ; Kojima, Yo

Author_Institution

Dept. of Mech. Eng., Nagaoka Univ. of Technol., Japan

Volume

1

fYear

2002

fDate

8-11 Oct. 2002

Firstpage

811

Abstract

A high temperature ultrasonic sensor for detecting inclusion particles in molten metals is presented. The sensor consists of a conventional piezoelectric transducer and a focused waveguide, and provides high spatial resolution measurements in molten metals in a pulse-echo mode at 10 MHz. A taper-shaped clad buffer rod is used as the waveguide. In order to design the waveguide, elastic wave propagation in the rod is evaluated by a numerical simulation using a finite difference method. Focusing ability of the acoustic lens fabricated at the end of the rod is also examined numerically. Using the developed sensor, backscattered echoes from alumina particles of 160 μm suspended in molten aluminum at 1073 K have clearly been observed.

Keywords

acoustic devices; alumina; aluminium; elastic waves; finite difference methods; inclusions; liquid metals; surface acoustic wave sensors; 10 MHz; 1073 K; 160 micron; Al₂O₃-Al; acoustic lens; alumina particles; conventional piezoelectric transducer; elastic wave propagation; finite difference method; focused waveguide; focusing; inclusion detection; liquid metals; molten metals; numerical simulation; pulse-echo mode; ultrasonic in-line sensors; Acoustic measurements; Acoustic propagation; Acoustic pulses; Acoustic waveguides; Numerical simulation; Piezoelectric transducers; Pulse measurements; Spatial resolution; Temperature sensors; Ultrasonic variables measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE

ISSN

1051-0117

Print_ISBN

0-7803-7582-3

Type

conf

DOI

10.1109/ULTSYM.2002.1193521

Filename

1193521