Abstract
Electromagnetic acoustic transducers (EMATs) are applied to detection of resin flow front in manufacturing process of fiber reinforced plastics by resin transfer molding (RTM) method. In order to improve the quality of RTM products, real-time monitoring of resin flow is required. Dielectric sensors have been used for such purposes, although they should be embedded in the products. In this study, we propose to detect the resin flow front by measuring the amplitude of multiple echoes in the mold. Reflection coefficient of ultrasonic wave depends on the boundary condition. During the passage of flow front across the measuring area, echo amplitude decreases. Multi-point EMAT, which dispenses with the sensor scan, is also developed. It was ensured that the resin flow front passage can be detected as stepdown of echo amplitude using the EMAT set on the outer surface of the mold.
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