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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.
Summary
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.
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.
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