Experimental Mechanics

, Volume 31, Issue 1, pp 60–64 | Cite as

Laser diffraction methods for high-temperature strain measurements

  • H. Pih
  • K. C. Liu


Optical methods, utilizing the interference fringes produced by diffraction of a laser light beam passing through a narrow slit, have been investigated for strain measurements at high temperatures above 1000°C. Two methods are reviewed, one suitable for dynamic loading conditions and the other for slow rate and static loading conditions. The basic principles of the methods, new instrumentation, and new measurement techniques are described. Experimental verification of the basic optical theory, system calibration, results of cross calibrations with foil strain gage, and sample applications at high temperatures are presented. Test results show that both methods are capable of performing accurate and reliable strain measurements at high temperatures.


Light Beam Strain Gage Strain Measurement Interference Fringe Diffraction Method 
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Copyright information

© Society for Experimental Mechanics, Inc. 1991

Authors and Affiliations

  • H. Pih
    • 1
  • K. C. Liu
    • 2
  1. 1.University of TennesseeKnoxville
  2. 2.Oak Ridge National LaboratoryOak Ridge

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