<title>Distributed sensor for rectangular plates</title>

Abstract

A new class of distributed sensors is presented which can measure both the linear, angular deflections and twist of flat composite plates. The sensor relies in its operation on a set of wires which are embedded off the neutral planes of the composite plates. The wires are arranged in a special manner which allows continuous monitoring of the deflection curve of the plate. The output signals of the wires are processed to determine the linear, angular displacements and twist at critical discrete points in the plate. The equations governing the operation of the sensor are developed using the theory of finite elements. The resulting equations provide the sensor with unique interpolation capabilities which make it possible to map the deflection and strain fields over the entire surface of the plate. The theoretical and experimental performance of the sensor are presented in both the time and frequency domains. Comparisons are given between the experimental performance of the distributed sensor and that of conventional laser sensors in order to demonstrate the accuracy and merits of the distributed sensors. The results obtained suggest the potential of this new class of sensors as a viable means for monitoring the static and dynamic deflections of flexible composite SMART plate.