Abstract
Cure monitoring is indespenable for resin transfer molding process GFRP products. Polyestel resin is usually adopted as matrix resin of the GFRP products. Polyestel changes its color during curing process. In the present study, this change in color is measured and degree of cure is sensored using the change of the transmitted light. The sensing system uses LED as a light source and an plastic optical fibers as light paths. A photodiode is employed as a light power sensor. This low cost system is applied to monitoring of degree of cure of polyestel resin. Degree of cure is measured by means of commercially avaiable dielectric sensors. The results are compared and the effectiveness of the system is discussed here.
