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Thermal Expansion Measurements by Photodetector Based Laser Beam Position Change Determination

Published online by Cambridge University Press:  28 February 2011

C. S. Vikram ,
D. K. Agrawal ,
R. Roy  and
H.A. McKinstry
C. S. Vikram
Affiliation:
Also affiliated with the Applied Research Laboratory
D. K. Agrawal
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
R. Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
H.A. McKinstry
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
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Abstract

A new method for thermal expansion measurements is described. The technique is based on rotation of a laser beam reflected from a probe bar caused by uneven thermal expansions of sample and reference rods. At a distance, the reflected gaussian laser beam is observed with a small photodetector (much smaller than the beam cross-section). The measurement of minute beam position change thus results in related low thermal expansion measurement capability. Experimental arrangement and the sensitivity are described. Some results are also reported.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 60: Symposium L – Defect Properties and Processing of High-Technology Nonmetallic Materials , 1985 , 259
Copyright
Copyright © Materials Research Society 1986

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