A utilização da técnica de lente térmica para a análise das propriedades térmicas de materiais transparentes
| Autor: | José Antonio Eiras, A.N. Medina, E. A. Falcão, D. Garcia, Mauro Luciano Baesso |
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| Jazyk: | portugalština |
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Materials science materiais transparentes difusividade térmica Mineralogy Small sample Polymer Thermal diffusivity law.invention Lens (optics) chemistry law Liquid crystal Thermal Ceramics and Composites Crystallite Composite material Spectroscopy espectroscopia de lente térmica |
| Zdroj: | Cerâmica v.55 n.335 2009 Cerâmica (São Paulo. Online) Universidade de São Paulo (USP) instacron:USP |
| Popis: | The thermal diffusivity is one of the physical properties that are among the most important in a material. Its determination presents several difficulties that require the use of accurate techniques that supply trustworthy values. In this work will be present the utilization of the thermal lens spectroscopy (TLS) as a technique to determine the thermal diffusivity (D) of transparent materials. As example are discussed the values of the thermal diffusivity of polycrystalline materials, glasses, polymer and liquid crystals. When compared with conventional techniques, the TLS presents the advantage to be rapid, to measure small sample size and to give accurate values at room temperature in the process of determination of the thermal diffusivity. When in concomitant use with other techniques it allows the determination of other thermo-optical parameters. In other words, the thermal lens spectroscopy is a powerful tool in the determination of thermo-optical parameters of transparent materials. |
| Databáze: | OpenAIRE |
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