Method for Accurate Surface Temperature Measurements During Fast Induction Heating

  • Benjamin LarregainEmail author
  • Nicolas Vanderesse
  • Florent Bridier
  • Philippe Bocher
  • Patrick Arkinson


A robust method is proposed for the measurement of surface temperature fields during induction heating. It is based on the original coupling of temperature-indicating lacquers and a high-speed camera system. Image analysis tools have been implemented to automatically extract the temporal evolution of isotherms. This method was applied to the fast induction treatment of a 4340 steel spur gear, allowing the full history of surface isotherms to be accurately documented for a sequential heating, i.e., a medium frequency preheating followed by a high frequency final heating. Three isotherms, i.e., 704, 816, and 927°C, were acquired every 0.3 ms with a spatial resolution of 0.04 mm per pixel. The information provided by the method is described and discussed. Finally, the transformation temperature Ac1 is linked to the temperature on specific locations of the gear tooth.


4340 steel gear induction heating temperature measurement 


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Copyright information

© ASM International 2013

Authors and Affiliations

  • Benjamin Larregain
    • 1
    Email author
  • Nicolas Vanderesse
    • 1
  • Florent Bridier
    • 1
  • Philippe Bocher
    • 1
  • Patrick Arkinson
    • 2
  1. 1.Mechanical Engineering DepartmentÉcole de Technologie SupérieureMontrealCanada
  2. 2.Pratt & Whitney CanadaLongueuilCanada

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