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Compact fiber-optic vector inclinometer

2010; Optica Publishing Group; Volume: 35; Issue: 7 Linguagem: Inglês

10.1364/ol.35.001034

1539-4794

Liyang Shao, Jacques Albert,

Semiconductor Lasers and Optical Devices

What we believe to be a novel fiber-optical inclinometer based on a dual-path core-to-cladding mode coupling mechanism is demonstrated. Both the amplitude and tilt direction of bends about a 2-mm-long flexure joint in an optical fiber can be determined. The sensor head consists of a nonadiabatic abrupt taper cascaded with a weakly tilted fiber Bragg grating. Measured bend angles of up to 12 degrees are demonstrated, as well as a method to increase the sensitivity for bend angles smaller than 4 degrees.