Practical acoustic thermometry: a new way to measure reactor temps?

Concept of a practical acoustic thermometer. Like a speaking tube, a practical acoustic thermometer relies on on the guiding of sound along an acoustic waveguide, but in an acoustic thermometer the timing of an acoustic pulse allows an estimate of the average temperature along the waveguide.



  • Figure 1a: Illustration of the conceptual speaking tube
  • Concept of a practical acoustic thermometer
  • Figure 2: Qualitative illustration of the ‘pulse-shape problem’
  • Figure 3: Qualitative illustration of two designs of a practical acoustic thermometer. In (a) two blind-ended tubes are used and in (b) two ‘U’ tubes are used.
  • Practical Acoustic Thermometer (PAT) before insertion into the furnace
  • Detailed design of a practical acoustic thermometer
  • Figure 5: The PAT Inconel-600 thermometer test results
  • The PAT silica thermometer
  • Figure 6: The PAT Inconel-600 thermometer test results showing for three thermal cycles between 300 °C and 1000 °C.
  • Figure 7: The PAT Inconel-600 thermometer long-term stability test
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