Abstract
An all-fiber displacement sensor with a simple configuration is proposed and investigated theoretically and experimentally. The proposed fiber displacement sensor consists of a half-loop structure of high-bend loss singlemode fiber-1060XP. A ratiometric power measurement system for interrogating the proposed sensor is also presented. By measuring the change in ratio of bend loss in the ratiometric measurement system, a change in displacement can be measured assuming the ratiometric system is calibrated. The proposed macrobending fiber–based displacement sensor achieves a competitive resolution of circa 0.3 μm and also benefits from simplicity compared with conventional fiber Bragg grating–based displacement sensor. The displacement sensor is sensitive to temperature and an experimental investigation of this sensitivity is presented. It is found that the ratio response has a linear variation with temperature; therefore, temperature dependence can be mitigated by a suitable correction process. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2231–2235, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25446
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