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

C. S. Vikram, Dinesh Kumar Agrawal, R. Roy, H. A. McKinstry

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)221-226
Number of pages6
JournalOptics and Lasers in Engineering
Volume7
Issue number4
DOIs
StatePublished - Jan 1 1986

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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