Chiang Mai Journal of Science

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Use  of  micro  machined  silicon  with  thin  films  has  led  to  the  development  of  many micro/macro devices including membrane pressure sensors, micro valves and cantilevers. A brief  review  of  the  potential  and  future  application  of  sensors  and  their  likely  impact  in various industries is presented. A number of medical imaging applications employ transducer arrays operating in the frequency range 50-100 MHz, which corresponds to PZT film thickness in the range 20-40 microns. This paper deals with the design and characterization of  a 50 MHz phased array transducer for skin and eye imaging with high degree of resolution using a new sol-gel  technique. This  offers new  diagnostic  possibilities  in  biomedical  engineering.  Peizo ceramic  and  their  composites  are  the  critical  components  for  the  most  of  the  underwater acoustic  devices.  Frequencies  less  than  1  KHz  are  finding  applications  in  long  range communication  in  sea  and  ocean  acoustic  tomography. The  design  of   such  low  frequency flexural  transducer  developed  by  the  author  has  been  described  along  with  its  acoustic performance. Use of  smart sensors and actuators in aerospace and industries is likely to grow at  a  rapid  pace.  A  short  review  of  their  application  in  automotive  and  aerospace  ia  also included in the end.

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