PubMed · 5018074
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H Littmann, H Riedel. 1972. [Two new operation microscopes].. https://pubmed.ncbi.nlm.nih.gov/5018074/
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With new ideas and with the aid of modern technology, novel microscopical and micro-analytical methods are practically implemented, as a fruit of the co-operative effect of theoretical and experimental advances achieved in distinct fields. The results obtained in the development of new micro-analytical instruments and in their applications, increasingly help to solve many investigative problems in materials science and in biology. Among the oldest forms of analytical microscopy, some encountered histophotometers while, among the latest, some are working with confocal microscopes. Given by one that had the opportunity of attending to both of the developments, an overview encompassing these two instruments can hopefully serve to illustrate the progress of analytical microscopy, a discipline evolving during the second half of this century.
We propose a new type of multiple-transducer scheme with functions of multiple-angle and multiple-frequency tomography for scanning tomographic acoustic microscopy (STAM) using transverse waves. We review the data acquisition system and mode conversion of the acoustic waves for STAM and the multiple-angle and multiple-frequency tomography. Our multiple-transducer scheme has three insonification angles and three resonance frequencies in order to operate, in the transverse wave mode, multiple-angle and multiple frequency tomography for STAM. In order to evaluate the performance of our transducer scheme, we have simulated tomographic reconstruction with a back-and-forth propagation algorithm. Simulation results show that our multiple-transducer scheme is capable of obtaining good resolution with transverse wave mode and multiple-frequency tomography. We also show that our multiple-transducer scheme is an efficient rotation tool for a number of projections.
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