High resolution large displacement/crack sensor

摘要

A structural displacement sensor that includes an arched member having two ends, where each end is attached to a fastening member. In an embodiment of the invention, the fastening members are configured to be attached to a structure. Further, a strain gauge is attached to the arched member, and the strain gauge is operatively connected to a signal processing device. In an embodiment, the arched member and strain gauge are configured to measure a displacement of the structure based on the amount of strain detected on the strain gauge.

主权项

1. A structural displacement sensor having only a single arched member comprising:
a single arched member having two ends, each end attached to a fastening member, wherein the fastening members are configured to attach to a structure; a first strain gauge attached to the arched member, wherein the first strain gauge is operatively connected to a signal processing device; and wherein the arched member and first strain gauge are configured to measure a displacement of the structure based on the amount of strain detected on the first strain gauge;wherein the first strain gauge is attached to the crown of the arched member, and wherein the arched member is configured to de-amplify the strain placed on the first strain gauge;wherein the first strain gauge comprises a fiber Bragg grating; andfurther comprising a second fiber Bragg grating strain gauge, wherein the first fiber Bragg grating strain gauge is attached to the top of the crown of the arched member, and the second fiber Bragg grating strain gauge is attached to the bottom of the crown of the arched member, such that analyzing signals from the two fiber Bragg grating strain gauges operates to reduce the effect of an thermally-induced strains in the two fiber Bragg grating strain gauges.