Determination of density distribution in powder compacts using ultrasonic tomography

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 compact...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2006-02, Vol.53 (2), p.360-369
Main Authors: Xiang Zhao, Rose, J.L., Huidong Gao
Format: Article
Language:English
Subjects:
Algorithms
Compacts
Densification
Density
Density distribution
Density measurement
Distortion measurement
Image reconstruction
Laser beams
Laser excitation
Powders
Time measurement
Tomography
Transducers
Ultrasonic transducers
Ultrasonic variables measurement
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0885-3010
1525-8955
0885-3010
DOI:10.1109/TUFFC.2006.1593374