SCANNING TOMOGRAPHIC ACOUSTIC MICROSCOPY

The scanning tomographic acoustic microscope (STAM) was proposed in 19 82 as a method of improving the resolution capability of the scanning laser acoustic microscope (SLAM) based on the principles of tomography , By modifying the SLAM with a quadrature detector, tomographic projec tions that contain both the amplitude and phase information of the sca ttered wavefield can be acquired, Subsequently, multiple projections a cquired with different incident waves are combined using the ''back-an d-forth'' propagation algorithm to form the tomographic reconstruction , Recently, the first STAM reconstructions have been obtained to exper imentally demonstrate the superior resolution capability of the STAM o ver the SLAM, In this paper, the implementation of the STAM is describ ed, and experimental reconstructions of multiple-layer specimens are d emonstrated.