Development of a calorimetric technique for measuring absorption cross section of rigid bodies—Case study: carbon fiber

A balanced calorimetric device has been developed to measure the absorption cross section of a single macroscopic sized particle (in this case a carbon fiber) at a microwave frequency of 35 GHz, as a function of size and orientation with respect to the electric field. The technique used is based on...

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Bibliographic Details
Published in:Review of scientific instruments 1997-11, Vol.68 (11), p.4084-4089
Main Authors: Gurton, Kristan P., Bruce, Charles W.
Format: Article
Language:English
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Summary:A balanced calorimetric device has been developed to measure the absorption cross section of a single macroscopic sized particle (in this case a carbon fiber) at a microwave frequency of 35 GHz, as a function of size and orientation with respect to the electric field. The technique used is based on simple thermodynamic principles that relate the electromagnetic absorption of a particle to its thermal response. A single particle is irradiated in a fixed volume of gas by an approximate plane wave. Absorption by the particle results in a change in the ambient pressure that is proportional to the absorption cross section of the particle. Comparison of measured quantities with recently developed theory agree well.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1148388