Optical method for detecting displacements and strains at ultra-high temperatures during thermo-mechanical testing

摘要

An ultra-high temperature optical method incorporates speckle optics for sensing displacement and strain measurements well above conventional measurement techniques. High temperature pattern materials are used which can endure experimental high temperature environments while simultaneously having a minimum optical aberration. A purge medium is used to reduce or eliminate optical distortions and to reduce, and/or eliminate oxidation of the target specimen.

主权项

1. A method for measuring properties of a specimen, comprising:
applying a first coating of a first material having a first emissivity to a portion of a surface of the specimen; applying a second coating of a second material having a second emissivity to a portion of the surface of the specimen, wherein the first emissivity is different from the second emissivity; radiatively heating the surface of the specimen; applying mechanical loading to the specimen; and observing the difference in emissivity patterns between the first and second materials.