Comparing thermal emission of 2 devices must be at same V?

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SUMMARY

When comparing the thermal emission of two devices, the approach depends on the specific characteristics being analyzed. To compare Thermal Resistance, it is advisable to apply the same power to both devices. For assessing surface Emissivity, maintaining the same temperature is crucial. If the goal is to analyze the Thermal Emission Spectrum, varying temperatures between the devices is acceptable. Each method yields different insights based on the chosen parameters.

PREREQUISITES
  • Understanding of Thermal Resistance concepts
  • Knowledge of surface Emissivity principles
  • Familiarity with Thermal Emission Spectrum analysis
  • Basic principles of electrical power and voltage
NEXT STEPS
  • Research methods for measuring Thermal Resistance in electronic devices
  • Learn about surface Emissivity and its impact on thermal performance
  • Explore techniques for analyzing Thermal Emission Spectra
  • Investigate the relationship between voltage, current, and power in thermal testing
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Engineers, thermal analysts, and researchers involved in device performance evaluation and thermal management will benefit from this discussion.

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When i compare the thermal emission of two devices, should i apply same voltage (both draw different currents) or should I make sure the power is the same for both?
 
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Depends on the what you want to find out by comparing their thermal emission. Different variables will probe different characteristics.

For instance:
1) If you want to compare their Thermal Resistance to the rest of the Universe it's probably easiest to use the same power.
2) If you want to compare their surface Emissivity then you want them at the same temperature.
3) If you want to compare their Thermal Emiission Spectrum to each other then use whatever yields different temperatures of the two devices.
4) Something else?
 

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