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Surface acoustic wave devices for harsh environment wireless sensing.

David W Greve1, Tao-Lun Chin, Peng Zheng

  • 1National Energy Technology Laboratory, Pittsburgh, PA 15236, USA. dg07@andrew.cmu.edu

Sensors (Basel, Switzerland)
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Summary

Langasite surface acoustic wave devices offer wireless sensing for harsh environments. This study details progress on oxygen gas sensors using tin oxide, correlating performance with resistivity measurements.

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Physical Chemistry

Background:

  • Langasite surface acoustic wave (SAW) devices are suitable for harsh-environment wireless sensing.
  • Previous research focused on developing SAW devices for gas concentration and temperature monitoring.
  • Metal oxide films are promising for oxygen sensing applications.

Purpose of the Study:

  • To review prior work on langasite SAW devices.
  • To report progress on implementing langasite SAW-based oxygen gas sensors.
  • To investigate the performance of tin oxide as an oxygen sensing layer.

Main Methods:

  • Development of langasite SAW devices.
  • Deposition of tin oxide sensing films.
  • Correlation of sensor performance with electrical resistivity measurements.
  • Characterization of barrier layer requirements for substrate protection.

Main Results:

  • Experimental data on the performance of a langasite SAW oxygen sensor utilizing a tin oxide sensing layer were obtained.
  • Sensor performance was directly correlated with measured resistivity of the tin oxide layer.
  • The necessity of an adherent barrier layer to prevent substrate interaction was identified.

Conclusions:

  • Langasite SAW devices show potential for oxygen gas sensing in challenging conditions.
  • Tin oxide is a viable sensing material, but requires careful integration to ensure device stability.
  • Further research into protective barrier layers is crucial for robust sensor development.