A design for an all-optical temperature insensitive fiber Bragg grating (FBG) based tilt sensor is reported. The sensor is capable of measuring the magnitude as well as the direction of inclination from the horizontal with a complete reversible response over the designed dynamic range of AE45°. The most important feature of the reported sensor is its inherent enhanced tuning capability for its sensitivity. An excellent sensitivity of the order of ∼0:0626 nm=°that can further be tuned is observed for the sensor. Experimental results show that a tilt angle resolution better than 0:008°with a tilt accuracy of ∼ AE 0:36°w as achieved.

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A design strategy for the development of an all-optical, temperature insensitive, nonpendulum-type tilt sensor employing fiber Bragg gratings (FBGs) is proposed and experimentally demonstrated. Being nonpendulum-type, there is no possibility of any inherent friction and the limiting effects at mechanical joints. The sensor is observed to be capable of measuring magnitude, as well as the direction of inclination from horizontal strategically more effectively and without any inherent instability. This is reflected in a relatively better resolution (better than 0.004°), a better accuracy (~±0.05°), and a lesser maximum discrepancy (~±0.001  nm) during the forward as well as the reverse tilt. Sensitivity of the proposed sensor, theoretically proportional to the half of the mass employed in the sensor design, is observed to be 0.012  nm/° with a comparatively smaller mass. Importantly, sensor response is characterized by a very high degree of reversibility and repeatability over the designed/observed dynamic range.

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