| 摘要 |
An extensometer measures and monitors changes in complex loads on a structure. The extensometer comprises opposed cantilever beams fixed in "mirrored" position and aligned with the structure. Each beam has a fixed end and a free end. The fixed end of the cantilever beam is attached to the structure being monitored. The free ends are attached to each other through a compliant, linearly elastic sensing element that is distorted by rigid-body motions of the cantilever beams relative to their attachments to the structure. The sensing element is capable of first order isolation of signals from discrete components of deflections of the structure in proportional response to the strains or stresses on the structure.
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