Highly Sensitive Fiber Optic Curvature Sensor
نویسنده
چکیده
A curvature fiber optic sensor using a two-core fiber (TCF) is proposed and demonstrated. The TCF, which is designed to allow coupling between the cores, acts as a directional coupler and thus offers sinusoidal spectral response. The sensor is fabricated by splicing a 50 mm-long section of TCF between two SMFs. When the fiber is bent, the coupling coefficient between the cores is modified mainly due to stress-optic effect resulting in a blue shift of the sinusoidal spectral response and then allowing performing measurement of curvature. The sensor exhibits linear response in the range from 0 to 0.27 m -1 with sensitivity of -137.87 nm/m -1 . OCIS codes: (060.2370) Fiber optics sensors; (120.0280) remote sensing and sensors; (280.4788) optical sensing and sensors.
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