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Optical fibre vibrometers for applications in fragile/sensitive items transportation

Kalligiannakis Konstantinos

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Summary

The detection and mitigation of transport-induced damage, particularly in high-value and sensitive objects, remains a critical challenge—especially in the case of micro-damages and micro-vibrations that escape human perception. This work presents a novel optical fiber-based sensor capable of non-invasive vibration monitoring through light intensity modulation. The sensing element of this sensor consists of a single-mode fiber that has been tapered and bent into a U-shape. This configuration increases sensitivity to bending-induced losses, which are detected as variations in transmitted light intensity. This makes the sensor capable of operating without the use of interferometric or grating structures, typically utilized in such applications. The tapered fiber was fabricated using a resistive heating and pulling process, and the final structure was integrated into an experimental setup involving a controlled vibration source. Several input signals were used, including square waves, pseudo-random binary sequences, sinusoids of various frequencies, and audio signals. The sensor output was recorded and analyzed both in the time domain and frequency domain using Fourier Transform methods. All measurements were performed under laboratory conditions, and the results demonstrate that the sensor is capable of responding to variations in mechanical excitation.

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