Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Ultrasonic inspection of an internal flaw in a ferromagnetic specimen using angle beam EMATs

Oguma I., Goto R., Sugiura T.

Przegląd Elektrotechniczny

2012

R. 88, nr 7b

78-81

Angle beam EMATs can transmit ultrasonic waves in oblique directions and detect them in a conductive specimen without any contact. Our FEM simulation verified effects of an internal flaw on receiver signal’s peaks shown in our experimental results for a ferromagnetic metal. Visualization of displacement distributions obtained by FEM further showed us how ultrasonic waves propagate a circumference of the flaw.

Elektromagnetyczne przetworniki akustyczne (EMPA) mogą transmitować fale ultradźwiękowe w żądanym kierunku oraz wykrywać je bezkontaktowo. Przeprowadzona w pracy symulacja metodą elementów skończonych zweryfikowała możliwość detekcji wewnętrznych wad w ferromagnetyku.

Real-time 3D ultrasound imaging using laser-induced breakdown

Yasumoro Y., Oshiro O., Chihara K., Doi M., Sugiura T., Kawada S.

Biocybernetics and Biomedical Engineering

2002

Vol. 22, no. 4

3-16

In this paper, we propose a new framework of ultrasonic (US) three-dimensional (3D) imaging, introducing laser-induced breakdown (LIB) as an acoustic source. LIB is a phenomenon in which substances transformed to plasma by a pulsed laser beam. LIB explosively emits a variety of energies such as heat, light and sound that also includes pulsed ultrasound. Emitted US waves have suitable characteristics for instantenous US imaging in terms of low directivity to enable a wide view and sharply pulsed waves to enhance the resolution. Utilizing these characteristics, we attempt to apply the synthetic aperture method for frontal 3D imaging in a real-time process. Experimental results show that even sparsely arrayed sensors allow a wider frontal view than that can be achieved in the case using existing transducer devices.