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Interaction of a 2450-MHz Microwave Field with Thermocouples and Thermistors

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McRee · 1973

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2450 MHz microwave radiation interfered with temperature sensors even when shielded, demonstrating this frequency's ability to disrupt sensitive electronic systems.

Plain English Summary

Summary written for general audiences

This 1972 study examined how 2450 MHz microwave fields (the same frequency used in microwave ovens) interact with temperature measurement devices like thermocouples and thermistors. Researchers found that microwave radiation at 100 mW/cm² interfered with these measuring instruments, affecting their accuracy whether they were shielded or unshielded.

Why This Matters

While this appears to be a technical study about measurement equipment, it reveals something important about microwave radiation's ability to interfere with electronic devices. The 2450 MHz frequency tested here is identical to what your microwave oven uses, and the 100 mW/cm² power density is roughly 1,000 times higher than typical cell phone exposures. What makes this significant is that it demonstrates how microwave fields can disrupt sensitive electronic equipment even when shielded. This has implications for understanding how the same frequency might interact with the bioelectric systems in your body. The fact that copper braided shielding didn't completely prevent interference suggests these fields have penetrating properties that shouldn't be dismissed when considering biological effects.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
McRee (1973). Interaction of a 2450-MHz Microwave Field with Thermocouples and Thermistors.
Show BibTeX
@article{interaction_of_a_2450_mhz_microwave_field_with_thermocouples_and_thermistors_g3801,
  author = {McRee},
  title = {Interaction of a 2450-MHz Microwave Field with Thermocouples and Thermistors},
  year = {1973},
  
  
}

Quick Questions About This Study

Yes, this study found that 2450 MHz microwaves at 100 mW/cm² interfered with both shielded and unshielded thermocouples and thermistors, affecting their temperature measurement accuracy despite protective copper braided shielding.
Researchers used 100 mW/cm² (milliwatts per square centimeter) power density, which is approximately 1,000 times higher than typical cell phone radiation levels but similar to microwave oven leakage limits.
The study showed that copper braided shielding connected to ground did not completely prevent 2450 MHz microwave interference with temperature sensors, indicating this frequency can penetrate common shielding materials.
The 2450 MHz frequency tested is identical to microwave ovens and close to WiFi frequencies (2.4 GHz). This study demonstrates how this common frequency can interfere with electronic equipment functionality.
Yes, researchers placed thermistors and thermocouples in two different geometric arrangements within the 2450 MHz field to evaluate how positioning affects microwave interference with the temperature sensing devices.