Optical method for determining the mechanical properties of a material
Abstract
Disclosed is a method for characterizing a sample, comprising the steps of: (a) acquiring data from the sample using at least one probe beam wavelength to measure, for times less than a few nanoseconds, a change in the reflectivity of the sample induced by a pump beam; (b) analyzing the data to determine at least one material property by comparing a background signal component of the data with data obtained for a similar delay time range from one or more samples prepared under conditions known to give rise to certain physical and chemical material properties; and (c) analyzing a component of the measured time dependent reflectivity caused by ultrasonic waves generated by the pump beam using the at least one determined material property. The first step of analyzing may include a step of interpolating between reference samples to obtain an intermediate set of material properties. The material properties may include sound velocity, density, and optical constants. In one embodiment, only a correlation is made with the background signal, and at least one of the structural phase, grain orientation, and stoichiometry is determined.
- Inventors:
-
- Barrington, RI
- Duxbury, MA
- Issue Date:
- Research Org.:
- Brown Univ., Providence, RI (United States)
- OSTI Identifier:
- 872015
- Patent Number(s):
- 5844684
- Assignee:
- Brown University Research Foundation (Providence, RI)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- FG02-86ER45267
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- optical; method; determining; mechanical; properties; material; disclosed; characterizing; sample; comprising; steps; acquiring; data; probe; beam; wavelength; measure; times; nanoseconds; change; reflectivity; induced; pump; analyzing; determine; property; comparing; background; signal; component; obtained; similar; delay; time; range; samples; prepared; conditions; rise; physical; chemical; measured; dependent; caused; ultrasonic; waves; generated; determined; step; interpolating; reference; obtain; intermediate; set; sound; velocity; density; constants; embodiment; correlation; structural; phase; grain; orientation; stoichiometry; ultrasonic wave; time dependent; waves generated; optical constants; optical method; probe beam; mechanical properties; material properties; data obtained; ultrasonic waves; pump beam; delay time; reference sample; measured time; sound velocity; grain orientation; chemical material; acquiring data; background signal; beam wavelength; /356/
Citation Formats
Maris, Humphrey J, and Stoner, Robert J. Optical method for determining the mechanical properties of a material. United States: N. p., 1998.
Web.
Maris, Humphrey J, & Stoner, Robert J. Optical method for determining the mechanical properties of a material. United States.
Maris, Humphrey J, and Stoner, Robert J. Thu .
"Optical method for determining the mechanical properties of a material". United States. https://www.osti.gov/servlets/purl/872015.
@article{osti_872015,
title = {Optical method for determining the mechanical properties of a material},
author = {Maris, Humphrey J and Stoner, Robert J},
abstractNote = {Disclosed is a method for characterizing a sample, comprising the steps of: (a) acquiring data from the sample using at least one probe beam wavelength to measure, for times less than a few nanoseconds, a change in the reflectivity of the sample induced by a pump beam; (b) analyzing the data to determine at least one material property by comparing a background signal component of the data with data obtained for a similar delay time range from one or more samples prepared under conditions known to give rise to certain physical and chemical material properties; and (c) analyzing a component of the measured time dependent reflectivity caused by ultrasonic waves generated by the pump beam using the at least one determined material property. The first step of analyzing may include a step of interpolating between reference samples to obtain an intermediate set of material properties. The material properties may include sound velocity, density, and optical constants. In one embodiment, only a correlation is made with the background signal, and at least one of the structural phase, grain orientation, and stoichiometry is determined.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1998},
month = {Thu Jan 01 00:00:00 EST 1998}
}
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