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Electropyroelectric technique for measurement of the thermal effusivity of liquids


R. Ivanov1, E. Marin2, I. Moreno1 and C. Araujo1

1Facultad de Física, Universidad Autónoma de Zacatecas, Zacatecas, México
2Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Politécnico Nacional, México D. F., México

Keywords: pyroelectric, electropyroelectric, thermal effusivity, liquids
property: thermal effusivity
material: liquids

The photopyroelectric method has been recognized as a reliable and useful tool for the measurement of the thermal properties of condensed matter samples. Usually the photothermal signal is generated using intensity modulated light beams, whose amplitudes are difficult to maintain stable. We describe a variant of this technique, called by us electropyroelectric (EPE) technique [1], that uses amplitude modulated electrical current as excitation source, via Joule heating of the metal contact on one side of the pyroelectric sensor. The possibilities of this method, in both direct and inverse measurement configuration, for thermal effusivity measurements have been demonstrated in experiments with test liquids (water, ethanol and glycerine). Our measurement uncertainties are about 3 %. We show that the EPE technique also allows absolute measurements of the thermal effusivity. In this way the influence on the experimental results of the frequency dependent instrumental transfer function can be straightforwardly diminished.

References
  1. R. Ivanov, E. Marin, I. Moreno, C. Araujo, J. Phys. D: Appl. Phys. 43, 225501 (2010)

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