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Proceedings Paper

Continuous monitoring of the progressive degradation of a liquid composite by means of a noninvasive microwave resonator
Author(s): Jose M. Catala-Civera; Antoni J. Canos-Marin; E. de los Reyes
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Paper Abstract

Microwave control capabilities have been used to monitor the degradation of polyol, an alcohol composite material commonly used in the footwear industry for polymerization purposes. The liquid flows continuously inside a thin pipe and its desirable properties are altered with time associated to moisture absorption processes. Consequently, variations in the dielectric properties are involved, and they can be detected by permittivity measurements. In this paper, in order to obtain high sensitivity and resolution, a rectangular cavity resonator working at a fixed frequency was designed using as sample holder a rectangular pipe containing the liquid going through. Changes in the liquid modify the original response of the cavity with a non- degraded liquid and these differences have been used to determine the degree of degradation of the material. The final response of the microwave resonator was experimentally validated with measurements in a continuous line.

Paper Details

Date Published: 6 July 2000
PDF: 11 pages
Proc. SPIE 4129, Subsurface Sensing Technologies and Applications II, (6 July 2000); doi: 10.1117/12.390606
Show Author Affiliations
Jose M. Catala-Civera, Technical Univ. of Valencia (Spain)
Antoni J. Canos-Marin, Technical Univ. of Valencia (Spain)
E. de los Reyes, Technical Univ. of Valencia (Spain)


Published in SPIE Proceedings Vol. 4129:
Subsurface Sensing Technologies and Applications II
Cam Nguyen, Editor(s)

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