Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy
The elastic and thermal transport properties of opaque materials may be measured using transient grating spectroscopy (TGS) by inducing and monitoring periodic excitations in both reflectivity and surface displacement. The “phase grating” response encodes both properties of interest, but complicates...
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| Format: | Article |
| Language: | en_US |
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2018
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| Online Access: | http://hdl.handle.net/1721.1/118413 https://orcid.org/0000-0003-2989-9550 https://orcid.org/0000-0002-9216-2482 |
| _version_ | 1810973690806927360 |
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| author | Dennett, Cody Andrew Short, Michael P |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Dennett, Cody Andrew Short, Michael P |
| author_sort | Dennett, Cody Andrew |
| collection | MIT |
| description | The elastic and thermal transport properties of opaque materials may be measured using transient grating spectroscopy (TGS) by inducing and monitoring periodic excitations in both reflectivity and surface displacement. The “phase grating” response encodes both properties of interest, but complicates quantitative analysis by convolving temperature dynamics with surface displacement dynamics. Thus, thermal transport characteristics are typically determined using the “amplitude grating” response to isolate the surface temperature dynamics. However, this signal character requires absolute heterodyne phase calibration and contains no elastic property information. Here, a method is developed by which phase grating TGS measurements may be consistently analyzed to determine thermal diffusivity with no prior knowledge of the expected properties. To demonstrate this ability, the wavelength-dependent 1D effective thermal diffusivity of pure germanium is measured using this type of response and found to be consistent with theoretical predictions made by solving the Boltzmann transport equation. This ability to determine the elastic and thermal properties from a single set of TGS measurements will be particularly advantageous for new in situ implementations of the technique being used to study dynamic materials systems. |
| first_indexed | 2024-09-23T08:11:36Z |
| format | Article |
| id | mit-1721.1/118413 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:11:36Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | mit-1721.1/1184132022-09-23T11:31:32Z Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy Dennett, Cody Andrew Short, Michael P Massachusetts Institute of Technology. Department of Materials Science and Engineering Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Short, Michael Philip Dennett, Cody Andrew Short, Michael P The elastic and thermal transport properties of opaque materials may be measured using transient grating spectroscopy (TGS) by inducing and monitoring periodic excitations in both reflectivity and surface displacement. The “phase grating” response encodes both properties of interest, but complicates quantitative analysis by convolving temperature dynamics with surface displacement dynamics. Thus, thermal transport characteristics are typically determined using the “amplitude grating” response to isolate the surface temperature dynamics. However, this signal character requires absolute heterodyne phase calibration and contains no elastic property information. Here, a method is developed by which phase grating TGS measurements may be consistently analyzed to determine thermal diffusivity with no prior knowledge of the expected properties. To demonstrate this ability, the wavelength-dependent 1D effective thermal diffusivity of pure germanium is measured using this type of response and found to be consistent with theoretical predictions made by solving the Boltzmann transport equation. This ability to determine the elastic and thermal properties from a single set of TGS measurements will be particularly advantageous for new in situ implementations of the technique being used to study dynamic materials systems. United States. National Nuclear Security Administration. Stewardship Science Graduate Fellowship (cooperative Agreement No. DE-NA0002135) SUTD-MIT International Design Centre (IDC) U.S. Nuclear Regulatory Commission (MIT Nuclear Education Faculty Development Program) 2018-10-10T14:32:51Z 2018-10-10T14:32:51Z 2018-06 2018-05 Article http://purl.org/eprint/type/JournalArticle 0021-8979 1089-7550 http://hdl.handle.net/1721.1/118413 Dennett, Cody A., and Michael P. Short. “Thermal Diffusivity Determination Using Heterodyne Phase Insensitive Transient Grating Spectroscopy.” Journal of Applied Physics 123, no. 21 (June 7, 2018): 215109. https://orcid.org/0000-0003-2989-9550 https://orcid.org/0000-0002-9216-2482 en_US http://dx.doi.org/10.1063/1.5026429 Journal of Applied Physics Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Prof. Short |
| spellingShingle | Dennett, Cody Andrew Short, Michael P Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy |
| title | Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy |
| title_full | Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy |
| title_fullStr | Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy |
| title_full_unstemmed | Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy |
| title_short | Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy |
| title_sort | thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy |
| url | http://hdl.handle.net/1721.1/118413 https://orcid.org/0000-0003-2989-9550 https://orcid.org/0000-0002-9216-2482 |
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