Gust N. Verbesserung der Signalauswertung für die Ultraschallmikroskopie = Improvement of signal analysis for the ultrasonic microscopy. - Dresden: TUDpress, 2011. - xiv, 102 p.: ill., graph. - (Dresdner Beiträge zur zerstörungsfreien Prüftechnik / Hrsg. von K.-J.Wolter, N.Meyendoff, H.Heuer; Bd.2). - ISBN 978-3-942710-22  Место хранения:   084 | Конструкторско-технологический институт научного приборостроения CO РАН | Новосибирск

Оглавление / Contents

Kurzfassung ..................................................... V Abstract ..................................................... VIII List ob abbreviations ........................................ XIII 1 Introduction ................................................. 1 1.1 Motivation .............................................. 2 1.2 System theoretical description .......................... 3 1.3 Structure of the thesis ................................. 6 2 Sound field .................................................. 8 2.1 Sound field measurement ................................. 8 2.2 Sound field modeling ................................... 11 2.2.1 Reflection and transmission coefficients ........ 11 2.2.2 Sound field modeling with plane waves ........... 13 2.2.3 Generalized sound field position ................ 19 2.3 Receiving transducer signal ............................ 20 2.3.1 Calculation of the transducer signal from the sound field ..................................... 20 2.3.2 Received signal amplitude ....................... 21 2.3.3 Measurement of reference signals ................ 24 3 Ultrasonic Simulation ....................................... 27 3.1 State of the art ....................................... 27 3.2 Simulation approach .................................... 28 3.2.1 Sound field measurement based simulation ........ 28 3.2.2 Reference signal based simulation ............... 30 3.3 Determination of the impulse response .................. 31 3.3.1 1D ray-trace algorithm .......................... 31 3.3.2 2D ray-trace algorithm .......................... 33 3.3.3 Complexity reduction - optimizations ............ 35 4 Deconvolution - Determination of reflection parameters ...... 38 4.1 State of the art ....................................... 39 4.1.1 Decomposition techniques ........................ 39 4.1.2 Deconvolution ................................... 41 4.2 Analytic signal investigations for deconvolution ....... 42 4.3 Single reference pulse deconvolution ................... 44 4.4 Multi-pulse deconvolution .............................. 47 4.4.1 Homogeneous multi-pulse deconvolution ........... 48 4.4.2 Multi-pulse deconvolution with simulated GSP profile ......................................... 49 5 Reconstruction .............................................. 50 5.1 State of the art ....................................... 50 5.2 Reconstruction approach ................................ 51 5.3 Direct material parameter estimation ................... 52 5.3.1 Sound velocities and layer thickness ............ 52 5.3.2 Density, elastic modules and acoustic attenuation ..................................... 54 5.4 Iterative material parameter determination of a single layer ......................................... 56 5.5 Reconstruction of complex specimens .................... 60 5.5.1 Material characterization of multiple layers .... 60 5.5.2 Iterative simulation parameter optimization with correlation ................................ 62 5.5.3 Pattern recognition reconstruction of specimens with known base structure ............. 66 6 Applications and results .................................... 71 6.1 Analysis of stacked components ......................... 71 6.2 Time-of-flight and material analysis ................... 74 7 Conclusions and perspectives ................................ 78 References .................................................. 82 Figures ........................................................ 86 Tables ......................................................... 88 Appendix ....................................................... 89 Acknowledgments ............................................... 100 Danksagung .................................................... 101 Curriculum vitae .............................................. 102