Long isotropic buffer rods

Jen, C. K.; Piché, L.; Bussière, J. F.

doi:10.1121/1.399946

Cited by 42 publications

(27 citation statements)

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“…The spurious echoes are unwanted, since they interfere with desired signals from an inspected object and make the SNR of the desired echo worse. In our previous work, we found that a taper shape of the buffer rod significantly reduced the trailing echoes [13]. In addition, cladding effectively works on not only reducing the trailing echo but also enhancing the ultrasonic guidance, which results in better SNR [8,9].…”

Section: Imagingmentioning

confidence: 99%

Ultrasonic imaging in molten magnesium

Ono¹,

Moisan²,

Jen³

2004

Meas. Sci. Technol.

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Processing magnesium (Mg) and its alloys in the molten state is often necessary for the refining and recycling, and for the casting to achieve the net shape forming. The containers to hold the molten Mg are commonly made of steel. There is a concern that the steel wall of the container will corrode from the inside, which might induce cracks resulting in dangerous and expensive spillage. In this note, development of ultrasonic techniques for imaging in molten Mg using clad steel buffer rods operated at 10 MHz is presented. The probing end of the buffer rod, having an ultrasonic lens, was immersed into molten Mg, while the other end, with an ultrasonic transducer, was air cooled to room temperature. An ultrasonic image of a character 'N', engraved on a stainless steel plate, which simulates a surface defect on a plate, immersed in molten Mg has been successfully observed at 690 • C using the focused probe.

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Section: Imagingmentioning

confidence: 99%

Ultrasonic imaging in molten magnesium

Ono¹,

Moisan²,

Jen³

2004

Meas. Sci. Technol.

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“…These spurious echoes deteriorate the SNR because of their possible interference with the desired signals to be measured. An effective way to reduce these unwanted spurious echoes is to use a tapered buffer rod (7) . Since the reduction of spurious echoes depends on the tapering angle, a proper angle has to be chosen in designing the geometry of the rod.…”

Section: Focused Ultrasonic Sensormentioning

confidence: 99%

“…In the last twenty years, several approaches using the buffer rod technique have been made (2) - (4) . Ultrasonic sensors were developed recently, where clad buffer rods provide superior wave guidance performance of high signal-to-noise ratio at elevated temperatures (5) - (7) . It has been demonstrated that such clad buffer rod can detect silicon carbide particles in molten aluminum in pitch-catch mode (8) .…”

Section: Introductionmentioning

confidence: 99%

In-Situ Observation of Alumina Particles in Molten Aluminum Using a Focused Ultrasonic Sensor

Ihara

Aso²,

Burhan

2004

JSME Int. J., Ser. A

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Ultrasonic in-situ observation of alumina particles in molten aluminum at temperature up to 800• C is presented. A focused ultrasonic sensor is employed for the high temperature measurement with a high spatial resolution. The sensor mainly consists of a conventional piezoelectric transducer, a taper-shaped clad buffer rod as a waveguide and a cooling system. Martensitic stainless steel is used as a material for the buffer rod and an acoustic lens is fabricated at the probe end of the rod. In order to examine the focusing ability of the acoustic lens, the acoustic field near the focusing zone is numerically evaluated by a finite difference method. Using the developed focused ultrasonic sensor, backscattered echoes from alumina particles of 160 µm suspended in the molten aluminum at 800• C have been observed clearly in pulse echo mode at 10 MHz. The effect of the size and the aggregation condition of the particle on the backscattered echoes has also been examined.

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“…In order to overcome such difficulty, recently clad waveguides with superior ultrasonic wave guidance and high SNR have been developed. 14,15) Using such clad waveguides, several ultrasonic pulse-echo measurements have been successfully performed for molten Zn, 16) Al 17,18) and Mg 19,20) at temperature up to 800 C.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The concept of an ultrasonic waveguide is a common technique for molten metal measurements. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] This technique is rather classical, but it is still attractive because of its simplicity, robustness and cost effectiveness. In this technique, measurements are made using a waveguide while the probe end is immersed in molten metals.…”

Section: Introductionmentioning

confidence: 99%

<I>In Situ</I> Observations of Solidification and Melting of Aluminum Alloy Using Ultrasonic Waveguide Sensor

2005

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The in situ observations of solidification and melting of an aluminum-silicon alloy (Al-12.6%Si) using an ultrasonic waveguide sensor are presented. The ultrasonic sensor consists of a conventional piezoelectric ultrasonic transducer, a cooling system and a titanium (Ti) rod as an ultrasonic waveguide. The sustainability of the Ti rod in the molten Al alloy is investigated by immersion tests for 1, 4, 8 and 16 h at 800 C. The formation of a layer consisting of globular TiAl 3 , disperse AlSi 2 Ti and -Al phases has been observed at the interface between the Ti and the Al alloy. Ultrasonic pulse-echo measurements of the Al alloy during solidification and melting have been performed using the ultrasonic sensor in temperature range from 200 to 800 C. The longitudinal wave velocity of the Al alloy shows a rapid and significant change from about 3900 to 5600 m/s around the eutectic point. An attempt to measure a solid/liquid interface of the Al alloy has been made at frequency of 2.25 MHz. The reflected echo from the interface undergoing directional solidification has been observed. The position and growth rate of the interface have also been determined from the reflected echo.

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Long isotropic buffer rods

Cited by 42 publications

References 0 publications

Ultrasonic imaging in molten magnesium

Ultrasonic imaging in molten magnesium

In-Situ Observation of Alumina Particles in Molten Aluminum Using a Focused Ultrasonic Sensor

<I>In Situ</I> Observations of Solidification and Melting of Aluminum Alloy Using Ultrasonic Waveguide Sensor

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