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Title: Laser interferometric dilatometer for low-expansion materials

Abstract

The development of a high-precision dilatometer based on interferometry presents a number of challenges. This paper describes a laser interferometric dilatometer developed for high-precision thermal expansion measurements in the materials laboratory. The Sandia dilatometer uses dual-beam laser interferometry with a computer-controlled optical alignment feature to achieve high-precision length change measurements. This device has been modified to expand its measurement capabilities in a number of areas. A new thermal chamber has been incorporated which provides a range of measurement from 90 to 500 K while minimizing thermal effects on the optical portion of the instrument. A new specimen holder has been developed to cover this temperature range while accommodating a wider variety of specimen types. In particular, thin (1 mm) composites may be employed in the holder, which uses a single specimen, with only modest shape and preparation requirements, to provide absolute length change measurements. Tilt errors limit the overall performance of dilatometers based on dual-beam interferometry. Significant improvements in precision were demonstrated by incorporating a unique optical system which independently measures specimen holder tilt; tilt errors were corrected and a length change resolution near 0.4 microstrain was achieved. Expansion coefficient data obtained with the device agreed with established results onmore » fused silica, platinum, and stainless steel. New expansion data were obtained from 90 to 293 K on stainless steel, NBS Standard Reference Material 738.« less

Authors:
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (USA)
OSTI Identifier:
7185845
Report Number(s):
SAND-87-2806C; CONF-880606-4
ON: DE88012329
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Conference
Resource Relation:
Conference: 10. symposium on thermophysical properties, Gaithersburg, MD, USA, 20 Jun 1988; Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPOSITE MATERIALS; DILATOMETRY; EXPERIMENTAL DATA; PERFORMANCE; PLATINUM; SILICA; SPECIFICATIONS; STAINLESS STEELS; THERMAL EXPANSION; ALLOYS; CHALCOGENIDES; CHROMIUM ALLOYS; CORROSION RESISTANT ALLOYS; DATA; ELEMENTS; EXPANSION; INFORMATION; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; METALS; MINERALS; NUMERICAL DATA; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PLATINUM METALS; SILICON COMPOUNDS; SILICON OXIDES; STEELS; THERMAL ANALYSIS; TRANSITION ELEMENTS; 656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)

Citation Formats

Drotning, W D. Laser interferometric dilatometer for low-expansion materials. United States: N. p., 1988. Web.
Drotning, W D. Laser interferometric dilatometer for low-expansion materials. United States.
Drotning, W D. 1988. "Laser interferometric dilatometer for low-expansion materials". United States.
@article{osti_7185845,
title = {Laser interferometric dilatometer for low-expansion materials},
author = {Drotning, W D},
abstractNote = {The development of a high-precision dilatometer based on interferometry presents a number of challenges. This paper describes a laser interferometric dilatometer developed for high-precision thermal expansion measurements in the materials laboratory. The Sandia dilatometer uses dual-beam laser interferometry with a computer-controlled optical alignment feature to achieve high-precision length change measurements. This device has been modified to expand its measurement capabilities in a number of areas. A new thermal chamber has been incorporated which provides a range of measurement from 90 to 500 K while minimizing thermal effects on the optical portion of the instrument. A new specimen holder has been developed to cover this temperature range while accommodating a wider variety of specimen types. In particular, thin (1 mm) composites may be employed in the holder, which uses a single specimen, with only modest shape and preparation requirements, to provide absolute length change measurements. Tilt errors limit the overall performance of dilatometers based on dual-beam interferometry. Significant improvements in precision were demonstrated by incorporating a unique optical system which independently measures specimen holder tilt; tilt errors were corrected and a length change resolution near 0.4 microstrain was achieved. Expansion coefficient data obtained with the device agreed with established results on fused silica, platinum, and stainless steel. New expansion data were obtained from 90 to 293 K on stainless steel, NBS Standard Reference Material 738.},
doi = {},
url = {https://www.osti.gov/biblio/7185845}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}

Conference:
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