Comparative Performance of PLZT and PVDF Pyroelectric Sensors Used to the Thermal Characterization of Liquid Samples

Abstract

Among the photothermal methods, the photopyroelectric (PPE) technique is a suitable method to determine thermal properties of different kinds of samples ranging from solids to liquids and gases. Polyvinylidene difluoride (PVDF) is one of the most frequently used pyroelectric sensors in PPE technique but has the disadvantage that it can be easily deformed by the sample weight. This deformation could add a piezoelectric effect to the thermal parameters assessment; also PVDF has a narrow temperature operation range when compared with ceramic pyroelectric sensors. In order to minimize possible piezoelectric effects due to sensor deformation, a ceramic of lanthanum modified lead zirconate (PLZT) was used as pyroelectric sensor in the PPE technique. Then, thermal diffusivity of some liquid samples was measured, by using the PPE configuration that denominated the thermal wave resonator cavity (TWRC), with a PLZT ceramic as pyroelectric detector. The performance obtained with the proposed ceramic in the TWRC configuration was compared with that obtained with PVDF by using the same configuration.

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“…Regarding the light response of PVDF, results (Figure 13a, b) showed an asymptotic behavior, coinciding with the one reported in photopyroelectric techniques [11][12][13].…”

“…The light response was also satisfactory of the PVDF coinciding with the photopyroelectric techniques reported [11][12][13].…”

“…This experimental arrangement is based on Balderas-Lopez and Mandelis "New Technique for Precise Measurements of the thermal Effusivity of Transparent Liquids," 2003 [11] and Mandelis and Wang "A Novel PVDF Thin-Film Photopyroelectric Thermal-Wave Interferometry," 2000 [12]. Our group have compared and discussed the use of PVDF with the ferroelectric ceramic PLZT as a pyroelectric sensor, "Comparative performance of PLZT and PVDF Sensors Used Phyroelectric to the Thermal Characterization of Liquid Samples," 2013 [13].…”

“…The results in Figure 13a, b showed an asymptotic behavior, similar to the ones described in the theory in the case of frequency modulation of laser stimulation. References amply illustrate the use of PVDF in the photopyroelectric technique [11][12][13].…”