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Type: Artigo de periódico
Title: An application of the front photopyroelectric technique for measuring the thermal effusivity of some foods
Author: Longuemart, S
Quiroz, AG
Dadarlat, D
Sahraoui, AH
Kolinsky, C
Buisine, JM
da Silva, EC
Mansanares, AM
Filip, X
Neamtu, C
Abstract: Photopyroelectric calorimetry, in the front (inverse) configuration (with thermally thick sensor and sample, and optically opaque sensor), was applied to measure the thermal effusivity of some fats and water-based juice products. The information was obtained via a frequency scan of the phase of the pyroelectric signal; the measurements need no calibration. The main advantages of this configuration above the other two previously proposed front schemes are: (i) it does not require the use of very thin foils or expensive semitransparent sensors; (ii) the information is contained in the phase of the signal (and not in the amplitude as usual), which is independent of the power fluctuations of the radiation source and, consequently, the results are more accurate and reproducible.
Country: EUA
Editor: Marcel Dekker Inc
Rights: fechado
Identifier DOI: 10.1081/CI-120003895
Date Issue: 2002
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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