Browsing by Author "Rantamaa, Anton"

This thesis presents an acoustic microscope that is using coded signals to improve the signal-to-noise ratio (SNR) without increasing the voltage applied to the transducer. The operating principle of an acoustic microscope is presented with a detailed description of the coded excitation scanning acoustic microscope (CESAM). Acoustic microscopy is compared to other non-destructive testing (NDT) methods, and developments to improve acoustic imaging with coded signals are presented. Biological sample images from a rabbit femur bone are presented, and issues with surface roughness related to imaging bone structures in general are discussed. The increase of bone content with increased time post operation is calculated. Surface roughness of a rabbit femur bone sample containing a bioactive glass implant is analyzed, and acoustic impedance map of this sample is presented.