CIOP   05384
CENTRO DE INVESTIGACIONES OPTICAS
Unidad Ejecutora - UE
capítulos de libros
Título:
FIBER OPTIC BASED INTERFEROMETRIC METHODS APPLIED TO PHOTOPOLYMERIZATION ANALYSIS
Autor/es:
GUSTAVO F. ARENAS; NELIDA RUSSO ; RICARDO DUCHOWICZ
Libro:
Interferometry Principles and Applications
Editorial:
Nova Publishers, Inc.
Referencias:
Lugar: New York; Año: 2011;
Resumen:
Several epoxies and photo- or thermal- cured polymers found their way in
almost every field of structures manufacturing. These materials can compete
with metallic ones and even substitute them in several applications. However,
it is well known that their mechanical properties are highly dependent upon
the curing process of the matrix. Curing evolution is connected directly to the
contraction process occurring in the material. Relevant information include the
evolution and final conversion (degree of curing) related to the among of the
chemical cross-linking occurring during cure, the gel point where a phase
change from liquid-like to solid-like occurs, the glass transition temperature
and the induced residual strain produced during the curing process causing
structure distortion and intrinsic strain accumulation. Several cure monitoring
techniques have been proposed and applied in the past. Among these
techniques, optical approaches seem to be the best candidate in polymer based
manufacturing monitoring. On this way, different methods based on
interferometric techniques by using fiber optics technologies have been
developed. In this work, we discuss the possibility of: first, optical sensors
based on a Fizeau fiber optic interferometer to measure polymer contraction
that occurs during cure with a measure resolution better than 100 nm; second,
the simultaneous application of a cantilever and the Fizeau interferometer,
and, finally, the use of a pair of fiber Bragg grating based sensors to uncouple
strain and temperature (assuming a thermal related cure process). Properties
and relevant information extracted from of the different techniques are
discussed.
strain and temperature (assuming a thermal related cure process). Properties
and relevant information extracted from of the different techniques are
discussed.