Application of dial-gage and laser speckles for ultra-low thermal-expansion measurements using push-rod dilatometers

Conversion of conventional push-rod dilatometers for ultra-low thermal-expansion measurements is described. The method is based on the determination of the displacement of the probe-rod by ultra-precise dial-gage measurements by means of a laser-speckle technique. The movement of speckles created in...

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Bibliographic Details
Published in:Optics and lasers in engineering 1986, Vol.7 (4), p.221-226
Main Authors: Vikram, C.S., Agrawal, D.K., Roy, R., McKinstry, H.A.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
Thermal instruments, apparatus and techniques
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Summary:Conversion of conventional push-rod dilatometers for ultra-low thermal-expansion measurements is described. The method is based on the determination of the displacement of the probe-rod by ultra-precise dial-gage measurements by means of a laser-speckle technique. The movement of speckles created in space by the laser beam incident on an aluminum foil attached to the needle of the gage is observed for the measurements. It has been found that the sensitivity of the modified dilatometer is orders of magnitude higher than the existing LVDT approach.
ISSN:0143-8166
1873-0302
DOI:10.1016/0143-8166(86)90002-3