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Title: System and method for the direct calorimetric measurement of laser absorptivity of materials

Abstract

A method and system for calorimetrically measuring the temperature-dependent absorptivity of a homogeneous material dimensioned to be thin and flat with a predetermined uniform thickness and a predetermined porosity. The system includes a material holder adapted to support and thermally isolate the material to be measured, an irradiation source adapted to uniformly irradiate the material with a beam of electromagnetic radiation, and an irradiation source controller adapted to control the irradiation source to uniformly heat the material during a heating period, followed by a cooling period when the material is not irradiated. A thermal sensor measures temperature of the material during the heating and cooling periods, and a computing system first calculates temperature-dependent convective and radiative thermal losses of the material based on the measured temperature of the material during the cooling period when beam intensity is zero, followed by calculation of the temperature-dependent absorptivity of the material based on the temperature-dependent convective and radiative thermal losses determined from the cooling period.

Inventors:
; ; ; ;
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1568081
Patent Number(s):
10,234,411
Application Number:
15/213,210
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA)
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 07/18/2016
Country of Publication:
United States
Language:
English

Citation Formats

Rubenchik, Alexander, Golosker, Ilya V., LeBlanc, Mary M., Mitchell, Scott C., and Wu, Sheldon S. System and method for the direct calorimetric measurement of laser absorptivity of materials. United States: N. p., 2019. Web.
Rubenchik, Alexander, Golosker, Ilya V., LeBlanc, Mary M., Mitchell, Scott C., & Wu, Sheldon S. System and method for the direct calorimetric measurement of laser absorptivity of materials. United States.
Rubenchik, Alexander, Golosker, Ilya V., LeBlanc, Mary M., Mitchell, Scott C., and Wu, Sheldon S. Tue . "System and method for the direct calorimetric measurement of laser absorptivity of materials". United States. https://www.osti.gov/servlets/purl/1568081.
@article{osti_1568081,
title = {System and method for the direct calorimetric measurement of laser absorptivity of materials},
author = {Rubenchik, Alexander and Golosker, Ilya V. and LeBlanc, Mary M. and Mitchell, Scott C. and Wu, Sheldon S.},
abstractNote = {A method and system for calorimetrically measuring the temperature-dependent absorptivity of a homogeneous material dimensioned to be thin and flat with a predetermined uniform thickness and a predetermined porosity. The system includes a material holder adapted to support and thermally isolate the material to be measured, an irradiation source adapted to uniformly irradiate the material with a beam of electromagnetic radiation, and an irradiation source controller adapted to control the irradiation source to uniformly heat the material during a heating period, followed by a cooling period when the material is not irradiated. A thermal sensor measures temperature of the material during the heating and cooling periods, and a computing system first calculates temperature-dependent convective and radiative thermal losses of the material based on the measured temperature of the material during the cooling period when beam intensity is zero, followed by calculation of the temperature-dependent absorptivity of the material based on the temperature-dependent convective and radiative thermal losses determined from the cooling period.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {3}
}

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