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A modified evaluation method to reduce finite pulse time effects in flash diffusivity measurement.
- Source :
-
Review of Scientific Instruments . Dec2015, Vol. 86 Issue 12, p1-5. 5p. 2 Diagrams, 3 Charts, 3 Graphs. - Publication Year :
- 2015
-
Abstract
- A modified evaluation method for laser flash is proposed. In this method, the moment of laser-heating cutoff time is considered as zero point. The penetration depth and formula equation of the sample temperature distribution are obtained with the approximate analytical solution before time zero (during laser heating) for the physical model of a continuously heated half-infinite, well-distributed sample. The weighted-average and approximate-equation methods are then used to quantitatively determine the laser effect depth, which leads to the formulation of a modified evaluation method in flash thermal diffusivity measurement. Results of the simulation calculations and experiments confirm the correctness of the modified method, which remarkably increases flash method applications. The modified method is applicable only to cases in which δ(x) does not exceed the sample thickness (√12α τ0 ≤ L) during laser heating. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LASERS
*THERMAL diffusivity
*HEAT conduction
*OPTOELECTRONIC devices
*SPECIFIC heat
Subjects
Details
- Language :
- English
- ISSN :
- 00346748
- Volume :
- 86
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Review of Scientific Instruments
- Publication Type :
- Academic Journal
- Accession number :
- 112030586
- Full Text :
- https://doi.org/10.1063/1.4936590