Theory of the photopyroelectric method for investigation of optical and thermal materials properties

Chirtoc, M.; Mihilescu, G.

doi:10.1103/physrevb.40.9606

Cited by 188 publications

(99 citation statements)

References 49 publications

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“…Due to the fact that the blackening carbon layer is very thin (\10 lm) and thermally very conductive, one can neglect its influence on the signal. Assuming a perfect sample-sensor thermal contact and a one-dimensional model of the heat propagation through the sandwich-like multilayered system, the complex PPE signal is given by the following expression [17,18]:…”

Section: Theorymentioning

confidence: 99%

Thermal characterization of ZnBeMnSe mixed compounds by means of photopyroelectric and lock-in thermography methods

et al. 2015

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In this work, a thermal characterization (measurement of dynamic thermal parameters) of quaternary Zn 1-x-y Be x Mn y Se mixed crystals was carried out. The crystals under investigation were grown from the melt by the modified high-pressure Bridgman method with different Be and Mn contents. The effect of Be and Mn contents on thermal properties of Zn 1-x-y Be x Mn y Se compounds was analyzed, by using the photopyroelectric (PPE) method in the back configuration (BPPE) for thermal diffusivity measurements and the PPE technique in the front configuration for thermal effusivity investigations. Infrared lock-in thermography was used in order to validate the BPPE results. The measured thermal effusivity and diffusivity allowed the calculation of thermal conductivity of the investigated materials.

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Section: Theorymentioning

confidence: 99%

Thermal characterization of ZnBeMnSe mixed compounds by means of photopyroelectric and lock-in thermography methods

et al. 2015

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“…In the photopyroelectric (PPE) technique, the temperature variation of a sample exposed to a modulated radiation is measured with a pyroelectric sensor [1,2]. One of the most frequently used detection configurations implies a direct irradiation of the sample and the subsequent measurement of its temperature rise by means of a pyroelectric sensor situated in good thermal contact with the sample's rear side.…”

Section: Introductionmentioning

confidence: 99%

Highly accurate photopyroelectric measurement of thermal diffusivity of vegetable oils

Dădârlat

Neamţu

Streza

et al. 2009

Euro J Lipid Sci & Tech

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High-accuracy photopyroelectric measurements, in the thermal-wave-resonator-cavity configuration, were performed in order to measure the thermal diffusivity of some vegetable oils. The high resolution (relative error 60.5%) of the above method allows for the detection of small changes in the values of this dynamic thermal parameter. The accuracy of the results is mainly due to the possibility to precisely control the variation (30-nm step) of sample thickness, a proper selection of the range of the thickness scan (2 m m , L m , 4 m m , 5 m m ), and an iterative procedure of data analysis. A correlation between thermal diffusivity and the fatty acid composition (obtained via gas chromatography) is suggested for some fresh (sunflower, hemp, flax, and soybean) oils and for hemp oil exposed to a microwave field: Thermal diffusivity appears to be determined by the overall content of polyunsaturated fatty acids.

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“…In the PPE method, the amount of heat developed in a sample, due to the absorption of a modulated light, is measured with a pyroelectric sensor (Mandelis and Zver 1985 ;Chirtoc and Mihailescu 1989). Usually, the light is sinusoidally modulated in intensity using electromechanical or acousto-optical choppers.…”

Section: Introductionmentioning

confidence: 99%

Photopyroelectric observation of melting in valeric (C5 : 0), linoleic (C18 : 2), linolenic (C18 : 3) and tricosanoic (C23 : 0) free fatty acids

Dădârlat

Bićanić

Gibkes

et al. 1998

J. Sci. Food Agric.

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Photopyroelectric (PPE) study of some saturated (C5 : 0, and C23 : 0) and unsaturated (C18 : 2 and C18 : 3) free fatty acids was performed in a temperature range that included their melting points. The standard PPE configuration was used consistently during the experiment; the special PPE case requests thermally thick sample and sensor and optically opaque sample. For those fatty acids for which literature data on volume‐specific heat were available (C18 : 2, C18 : 3), the behaviour around the melting point of all static and dynamic thermal parameters (specific heat, thermal conductivity, diffusivity and effusivity) was obtained. Since no data for volume‐specific heat of C5 : 0 and C23 : 0 were found in the literature, only the temperature behaviour of the thermal diffusivity was obtained for these specimens. © 1998 Society of Chemical Industry

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Theory of the photopyroelectric method for investigation of optical and thermal materials properties

Cited by 188 publications

References 49 publications

Thermal characterization of ZnBeMnSe mixed compounds by means of photopyroelectric and lock-in thermography methods

Thermal characterization of ZnBeMnSe mixed compounds by means of photopyroelectric and lock-in thermography methods

Highly accurate photopyroelectric measurement of thermal diffusivity of vegetable oils

Photopyroelectric observation of melting in valeric (C5 : 0), linoleic (C18 : 2), linolenic (C18 : 3) and tricosanoic (C23 : 0) free fatty acids

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