Document Detail

Photothermal gas analyzer for simultaneous measurements of thermal diffusivity and thermal effusivity.
MedLine Citation:
PMID:  16841952     Owner:  NLM     Status:  PubMed-not-MEDLINE    
In this paper, we describe a new, simple, and fast photothermal method for simultaneous measurements of two important gas thermal properties: thermal diffusivity and thermal effusivity. The method consists essentially in combining a photoacoustic cell and a thermal wave pyroelectric cell enclosed in a single compact gas analyzer. The photoacoustic cell is kept filled with synthetic air and sealed. The pyroelectric cell is also filled with synthetic air, and after some warm up time, the synthetic air is exchanged to the gas of interest. It is shown that the analysis of the transient and saturation signals of both photoacoustic and pyroelectric cells is capable of measuring the thermal properties with an accuracy of 3%. This particular capability of performing simultaneously the measurements of thermal diffusivity and thermal effusivity allows us to carry on the complete characterization of the thermal properties of gases.
Israel A Esquef; Ana Paula L Siqueira; Marcelo G da Silva; Helion Vargas; Luiz Carlos M Miranda
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Analytical chemistry     Volume:  78     ISSN:  0003-2700     ISO Abbreviation:  Anal. Chem.     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-07-17     Completed Date:  2007-04-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5218-21     Citation Subset:  -    
Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brazil.
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