Determination of Density Distribution in Ferrous Powder Compacts Using Ultrasonic Tomography

Xiang Zhao, Joseph L. Rose, Huidong Gao

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)360-369
Number of pages10
JournalIEEE transactions on ultrasonics, ferroelectrics, and frequency control
Issue number2
StatePublished - Feb 2006

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering


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