A Macrobending Singlemode Fiber Refractive Index Sensor for Low Refractive Index Liquids

摘要: An all-fiber refractive index sensor with a simple configuration is proposed and investigated. The fiber refractometer consists of full-loop structure bare high-bend loss singlemode fiber-1060XP, employing the well-known whispering gallery mode (WGM) effect induced by evanescent wave excitation to measure an external medium. A competitive sensitivity achieved (average 725.76nm/RIU at bend diameter 19.3mm) compared other fiber-optic sensors, plus benefits resulting from simplicity, low cost ease fabrication. media have RI values that lie in range 1.33~1.40, for example, deionized water (1.333@589.3nm) acetone (1.359@589.3nm). Such are below fused silica (1.458@589.3nm), which primary material making up cladding core, WGM effects. In this paper, we propose liquids operates on principle exciting WGMs formed bent fiber, where peak shift wavelength occurs serves as This involves significantly different operating measurement approach, comparison sensors under test greater than those cladding.