PMID: 16529110Mar 15, 2006Paper

Determination of density distribution in ferrous powder compacts using ultrasonic tomography

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Xiang ZhaoHuidong Gao

Abstract

Laser-induced ultrasonic bulk wave tomography is used for density variation determination of powder metal compacts. A laser beam is used to excite ultrasonic energy, and the signals passing through the specimen are received by an air-coupled transducer. The density variations of powder metal compacts can be determined directly by the cross-sectional tomographic images of slowness obtained by using a filtered, backprojection algorithm based on measured time of flights. Interpolations with respect to sample and projection angles are used to generate the input data required for displaying a well-balanced, reconstructed image to reduce the aliasing distortions caused by insufficient input data. Results of presintered cylindrical ferrous powdered samples show that this novel approach makes the reconstruction process more cost effective than the very tedious, time-consuming, and inaccurate metallographic methods, thus making it a potentially powerful tool for studying manufacturing processes through significant parameters to obtain a more uniform density distribution.

References

Jan 14, 2000·Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society·R ShekharJ F Cornhill
Jul 4, 2001·Ultrasonics·E V Malyarenko, M K Hinders
May 6, 2004·Medical Physics·Yuan XuPeter Kuchment

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