NDLI: Simultaneous Absorptance and Thermal-Diffusivity Determination of Optical Components with Laser Calorimetry Technique

Content Provider	Springer Nature Link
Author	Wang, Yanru Li, Bincheng
Copyright Year	2012
Abstract	The laser calorimetry (LCA) technique is used to determine simultaneously the absorptances and thermal diffusivities of optical components. An accurate temperature model, in which both the finite thermal conductivity and the finite sample size are taken into account, is employed to fit the experimental temperature data measured with an LCA apparatus for a precise determination of the absorptance and thermal diffusivity via a multiparameter fitting procedure. The uniqueness issue of the multiparameter fitting is discussed in detail. Experimentally, highly reflective (HR) samples prepared with electron-beam evaporation on different substrates (BK7, fused silica, and Ge) are measured with LCA. For the HR-coated sample on a fused silica substrate, the absorptance is determined to be 15.4 ppm, which is close to the value of 17.6 ppm, determined with a simplified temperature model recommended in the international standard ISO11551. The thermal diffusivity is simultaneously determined via multiparameter fitting to be approximately 6.63 × 10$^{−7}$ m$^{2}$ · s$^{−1}$ with a corresponding square variance of 4.8 × 10$^{−4}$. The fitted thermal diffusivity is in reasonably good agreement with the literature value (7.5 × 10$^{−7}$ m$^{2}$ · s $^{−1}$). Good agreement is also obtained for samples with BK7 and Ge substrates.
Starting Page	2069
Ending Page	2075
Page Count	7
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	33
Issue Number	10-11
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2012-07-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Absorptance Laser calorimetry Optical components Thermal diffusivity Condensed Matter Physics Mechanics Physical Chemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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