Application of spatially and temporally apodized non-confocal acoustic transmission microscopy to imaging of directly bonded wafers

Application of a line-shaped point spread function (PSF) to imaging of void defects in directly bonded wafers is considered. Two non-confocally adjusted spherical transducers are employed to implement an acoustic microscope operating in transmission with a time dependent point spread function, whose...

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Veröffentlicht in:Ultrasonics 2006, Vol.44 (1), p.54-63
Hauptverfasser: Twerdowski, Evgeny, Wannemacher, Reinhold, Razek, Nasser, Schindler, Axel, Grill, Wolfgang
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container_title Ultrasonics
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creator Twerdowski, Evgeny
Wannemacher, Reinhold
Razek, Nasser
Schindler, Axel
Grill, Wolfgang
description Application of a line-shaped point spread function (PSF) to imaging of void defects in directly bonded wafers is considered. Two non-confocally adjusted spherical transducers are employed to implement an acoustic microscope operating in transmission with a time dependent point spread function, whose shape is optimized by both temporal apodization of the received signal and spatial apodization of the transducer aperture. Strong imaging artifacts resulting from the generation and detection of edge waves are eliminated in this way. It is shown by several examples that only a broadband system can be utilized in order to obtain a line-shaped PSF suitable for imaging.
doi_str_mv 10.1016/j.ultras.2005.08.001
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subjects Acoustic signal processing
Acoustics
Cross-disciplinary physics: materials science
rheology
Directly bonded wafers
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Line-shaped tomography
Materials science
Materials testing
Non-confocal acoustic transmission microscopy
Physics
Point spread function
Time-gated signal acquisition
Ultrasonics, quantum acoustics, and physical effects of sound
title Application of spatially and temporally apodized non-confocal acoustic transmission microscopy to imaging of directly bonded wafers
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