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Sensors 2018, 18(1), 96; https://doi.org/10.3390/s18010096

A Novel Approach to Monitoring the Curing of Epoxy in Closed Tools by Use of Ultrasonic Spectroscopy

Institut for Adaptronics and Function Integration, Technische Universität Braunschweig, Langer Kamp 6, 38106 Braunschweig, Germany
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Received: 11 October 2017 / Revised: 27 December 2017 / Accepted: 28 December 2017 / Published: 31 December 2017
(This article belongs to the Section Physical Sensors)
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Abstract

The increasing use of composite materials has led to a greater demand for efficient curing cycles to reduce costs and speed up production cycles in manufacturing. One method to achieve this goal is in-line cure monitoring to determine the exact curing time. This article proposes a novel method through which to monitor the curing process inside closed tools by employing ultrasonic spectroscopy. A simple experiment is used to demonstrate the change in the ultrasonic spectrum during the cure cycle of an epoxy. The results clearly reveal a direct correlation between the amplitude and state of cure. The glass transition point is indicated by a global minimum of the reflected amplitude. View Full-Text
Keywords: ultrasonic; cure monitoring; resonant ultrasonic spectroscopy ultrasonic; cure monitoring; resonant ultrasonic spectroscopy
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Pommer, C.; Sinapius, M. A Novel Approach to Monitoring the Curing of Epoxy in Closed Tools by Use of Ultrasonic Spectroscopy. Sensors 2018, 18, 96.

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