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Spectral Pyrometry for Practical Temperature Measurement in the TEM.

D Keith Coffman1, Khalid Hattar2, Jian Luo3

  • 1Department of Materials Science & Engineering, University of Illinois Urbana-Champaign, Champaign, IL 61801, USA.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|November 26, 2024
PubMed
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This study provides a practical guide for spectral pyrometry calibration and use in electron microscopy. It enables accurate, contact-free microscale temperature measurements above 600°C for materials research.

Keywords:
in situ TEMhigh temperaturelaser heatedspectral pyrometry

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Area of Science:

  • Materials Science
  • Optical Physics
  • Microscopy

Background:

  • Accurate microscale temperature measurement is crucial for ultra-high temperature in situ electron microscopy.
  • Optical pyrometry offers a contact-free solution but requires careful calibration due to emissivity and transmission effects.

Purpose of the Study:

  • To present a practical guide for calibrating and utilizing a spectral pyrometry system for microscale temperature determination.
  • To demonstrate the system's integration with transmission electron microscopy for advanced materials analysis.

Main Methods:

  • Calibration of a spectral pyrometry system using a Czerny-Turner spectrometer attached to a transmission electron microscope.
  • Utilizing a thermocouple or commercial heated sample holder for system calibration.
  • Measuring arbitrary samples at temperatures above approximately 600°C.

Main Results:

  • Achieved an accuracy of 2% in temperature measurements.
  • Demonstrated the potential for sub-second temporal resolution and sub-Kelvin temperature resolution.
  • Successfully integrated pyrometry with diffraction-based strain measurement and live-video sintering observation.

Conclusions:

  • The developed spectral pyrometry system provides a reliable method for contact-free temperature measurement in high-temperature electron microscopy.
  • This technique enhances the study of thermal properties and dynamic processes in materials at the microscale.