By Farhad Ansari
Fresh advances in fiber optic expertise, and the potential of their use in civil buildings has instigated the improvement of a couple of study actions within the civil engineering neighborhood. This booklet is meant for fast dissemination of present state-of-the-art in this rising know-how. Fiber optic sensors, and shrewdpermanent constitution expertise were effectively hired in area and aeronautics functions. With minimum study, those applied sciences could be utilized to civil constructions. Fiber optic sensors will help safeguard our infrastructure. This publication includes information about: ideas for size of pressure, temperature, strain and magnetic fields; shrewdpermanent constitution know-how; purposes in fracture mechanics; and embedment in concrete
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Additional info for Applications of fiber optic sensors in engineering mechanics : a collection of state-of-the-art papers in the applications of fiber optic technologies to civil structures
The optical fibre is itself typically 80 OSTIC PROGRAMME 43 to 125 microns in diameter. Consequently the optical fibre represents a potentially large inclusion into the composite structure. The experimental procedures involved investigating a considerable range of optical fibre diameters and coatings, including in the latter carbon, polyimides and acrylates as provided by fibre manufacturers. Preliminary work was also undertaken with metal coated fibres using both aluminium and indium as the coating materials.
Mechanical structures have been extensively instrumented for test purposes for many years. The traditional technique is to attach an array of strain sensors and/or thermocouples to the structure and record the outputs from these individual sensors whilst exercising the structure through its performance range. This approach is adequate for laboratory testing but, largely due to the complexity of the wiring harness, is totally incompatible with field use. Consequently any sensor technology which is used for structural monitoring must be capable of making measurements with comparable spatial and thermal/strain resolution to the individual sensor array but should also minimise the wiring harness and be compatible with the mechanical properties of the material under tests.
Nevertheless, strain direction ambiquity can=e o ercome in these sensors using two slightly different wavelengths or two adjacent nsors with different cavity lengths. Physically decoupling one end of the sensor ead from the structure also permits the temperature to be determined. Two such sensors were embedded in 15cm x 20cm x 122cm reinforced cement concrete specimen during fabrication. Cylindrical metal washers ensured effective longitudinal strain coupling for sensors embedded directly in concrete, while the other sensors were attached to metal reinforcing rods prior to embedding.
Applications of fiber optic sensors in engineering mechanics : a collection of state-of-the-art papers in the applications of fiber optic technologies to civil structures by Farhad Ansari