This paper presents a novel and simple temperatureinsensitive optical tilt sensor based on a single eccentriccore fiber Bragg grating (ECFBG). By partly inserting an ECFBG into a ceramic ferrule, the reflection spectrum of the ECFBG splits into two peaks as a result of the applied tilt angle. The magnitude and direction of inclination in one-dimension can be determined by monitoring the wavelength separation between both peaks, which is inherently insensitive to temperature. The proposed tilt sensor has a good linear response within a wide dynamic range of ±45°, with a sensitivity of 0.012 nm/°, resolution of 0.83° and accuracy of 0.41°. Being free from any inherent mechanical joint/ friction, along with the advantages of a compact structure, good repeatability and low cost, the proposed sensor is highly suitable for practical engineering applications.
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