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THREE-DIMENSIONAL STRUCTURAL STRAIN MEASUREMENT WITH THE USE OF FIBER-OPTIC SENSORS.
| 题名： | THREE-DIMENSIONAL STRUCTURAL STRAIN MEASUREMENT WITH THE USE OF FIBER-OPTIC SENSORS. |
| 作者： | Grossman-BG; Huang-L-T; Cosentino-PJ; von-Eckroth-W |
| 关键词： | THREE-DIMENSIONAL; STRAIN-MEASUREMENTS; STRUCTURES-; FIBER-OPTICS; SENSORS-; STRUCTURAL-INTEGRITY; FAILURE-MODE; INTELLIGENT-VEHICLE-HIGHWAY-SYSTEMS; CIVIL-ENGINEERING; MONITORING- |
| 摘要： | Three-dimensional strain sensing inside a structure is not feasible with conventional strain sensing techniques such as electrical strain gauges, which are limited to surface measurements. Three-dimensional strain measurement inside a structure would find uses in a variety of new applications: enhanced understanding and detection of composite failure modes, such as delamination; sensing for adaptive structural control; intelligent vehicle highway systems; and structural health monitoring systems for civil structures. The latter application could involve remotely monitoring structural integrity during and after an earthquake, for example. A fiber-optic strain sensor array (FOSSA) in a planar, patch-like configuration was developed, and accurate measurement of the three prinicipal strains inside a simple structure was demonstrated. The planar configuration was chosen to avoid the difficulty and structural degradation of embedding optical sensors in three planes. Two extrinsic Fabry-Perot interferometric (EFPI) sensors and one polarimetric sensor form the planar sensor array. The two EFPI sensors were placed perpendicular to each other in the sensor plane to extract the two normal strain components along the x and y axes. The polarimetric sensor embedded in the plane was used to extract the third normal strain acting on the z axis. The sensor array was embedded in an epoxy resin cube and loaded to 454 kg (1,000 lb) with a loading machine. The strains that were measured correlated well with the external strains measured with surface-bonded electrical strain gauges. The variation in measured strain between the two sensor systems was less than 4% for all three principal axes. |
| 总页数： | Transportation Research Record. 1997. (1596) pp45-50 (7 Fig., 3 Tab., 34 Ref.) |
| 报告类型： | 科技报告 |
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