Discrete distributed sensors and system for spatial sensing

Aeronautics and astronautics – Miscellaneous

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73DIG4, 73180, 73147, 73774, 73862623, 73754, 244203, 244219, 244 75R, 244 76R, G01N 2904, G01L 900

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053988850

ABSTRACT:
A sensor has a sensing region that responds to a surface property by producing an output signal. The sensor has a spatially distributed shape or sensitivity so that the output decreases away from a central part of the sensor, and thus the outputs of plural sensors combined have finite spatial transform as well as high roll off in spatial frequency. Preferably the output decreases to zero at edges of the sensor, and conditions of continuity or vanishing may be imposed on first or higher order derivatives. An edge sensor suitable for mounting at the edge of the structure has its weight function obtained by processes of reflecting and inverting the weight function at an edge. A sensor system employs plural such sensors and edge sensors to produce bounded spatial transfer functions for characterizing the structure. Embodiments of piezeoelectric, resistive, capacitive and thermal sensors are described.

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Andersson, et al., "Discrete Shaped Strain Sensors For Intelligent Structures", Space Engineering Research Center, Massachusetts Institute of Technology, Cambridge, Mass. 02139, Submitted to the 2nd U.S./Japan Conference on Adaptive Structures, Nov. 12-14, 1991.
Andersson, et al. "Discrete Distributed Strain Sensing of Intelligent Structures", Space Engineering Research Center, Massachusetts Institute of Technology, Cambridge, Mass. 02139, Presented at the 33rd SDM Conference, Dalls, Tex. Apr. 13-15, 1992.
Crawley, et al. "Static Aeroelastic Control Using Strain Actuated Adaptive Structures", Space Engineering Research Center Department of Aeronautic and Astronautics, Masschusetts Institute of Technology, Cambridge, Mass. 02139, Submitted to the U.S./Japan Conference on Adaptive Structures Nov. 13, 1990.

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