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Error sources affecting thermocouple thermometry in RF electromagnetic fields.

D P Chakraborty, I A Brezovich

    The Journal of Microwave Power
    |March 1, 1982
    PubMed
    Summary
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    Thermocouple errors in radiofrequency fields during hyperthermia can be minimized. Proper shielding and insulation prevent significant temperature inaccuracies, ensuring reliable measurements below 0.1 degrees C.

    Area of Science:

    • Biomedical Engineering
    • Medical Physics
    • Thermometry

    Background:

    • Radiofrequency (RF) electromagnetic fields are used in hyperthermia treatments.
    • Thermocouple thermometry is susceptible to errors in these RF fields.
    • Understanding and mitigating these errors is crucial for accurate temperature monitoring.

    Purpose of the Study:

    • To describe and quantify errors in thermocouple thermometry within RF electromagnetic fields.
    • To identify the sources of RF-induced errors in thermocouples.
    • To present methods for minimizing these thermometry errors during hyperthermia.

    Main Methods:

    • Analysis of RF current coupling (capacitive and inductive) into thermocouple circuits.
    • Application of low-frequency theories to estimate error magnitudes.

    Related Experiment Videos

  • Experimental validation of error sources and mitigation strategies.
  • Evaluation of thermocouple insulation and filtering techniques.

    • Main Results:

    • RF currents cause interference ('pick-up') and genuine temperature changes at the thermocouple junction.
    • Sources of error include junction current heating, surrounding material heating, and eddy currents.
    • Adequate filtering, shielding, and insulated thermocouples (e.g., Bailey IT-18) minimize errors.
    • At 13.56 MHz and <100 V rms, errors are <0.1°C with precautions.

    Conclusions:

    • Thermocouple thermometry errors in RF fields are significant but manageable.
    • Implementing specific precautions effectively minimizes temperature measurement inaccuracies.
    • Accurate temperature monitoring is achievable in hyperthermia using corrected thermocouple techniques.