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Multiplexed lock-in thermography.

Bernd A F Kopera1, Markus Retsch1

  • 1Department of Chemistry, Physical Chemistry I, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany.

The Review of Scientific Instruments
|January 30, 2021
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Summary
This summary is machine-generated.

This study introduces novel heating signals for frequency-domain heat transfer measurements, reducing average sample temperature rise. This enables more accurate thermal property determination using lock-in thermography.

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Area of Science:

  • Physics
  • Materials Science
  • Thermal Engineering

Background:

  • Frequency-domain measurement methods are common for heat transfer analysis.
  • Average temperature rise in samples during modulated heating can affect thermal property measurements.
  • Existing methods may be limited by temperature-dependent thermal properties.

Purpose of the Study:

  • To investigate alternative heating signals (square waves, multiplexed sine waves) to minimize average temperature rise.
  • To enhance the accuracy of thermal property measurements in frequency-domain techniques.
  • To enable simultaneous multi-frequency measurements for comprehensive thermal analysis.

Main Methods:

  • Application of square wave and multiplexed sine wave heating signals.
  • Utilizing lock-in thermography for precise temperature detection.
  • Employing the Goertzel algorithm for efficient spectral component extraction.

Main Results:

  • Demonstrated reduction in average sample temperature rise using proposed signals.
  • Successfully achieved simultaneous measurements at multiple frequencies.
  • Validated the efficiency of the Goertzel algorithm for signal processing.

Conclusions:

  • Square waves and multiplexed sine waves are effective for reducing average temperature rise in modulated heating experiments.
  • Lock-in thermography combined with these signals allows for accurate, multi-frequency thermal property characterization.
  • The Goertzel algorithm provides an efficient method for analyzing the complex temperature signals.