A description of the experimental setup, test procedure, and data-processing of an intensity- modulated fiber optic displacement sensor which has a broad linear range of analog output and transforms to digital type is presented in this paper. Compared with various fiber optical sensors, this fiber sensing head has a bundle of fibers with relatively novel devices which consists of a P.B.S. (polarized beam splitter) and two detectors to prevent confusing front and back slope in the relation of displacement and signal intensity.

The real advantage of fiber optical displacement sensors lies in solving vibration testing problems for which the measured system needs a precise and high frequency response. With fiber optical sensors we obtained the data of the system excitation as the outcome of experimentation, then transformed the experimental data through a FFT system and obtained the vibration information of the testing system. From the experimental results we proved this device is economical and feasible.

Subject terms: intensity-modulated fiber displacement sensor, a bundle of fibers

I. Introduction
II. Set-up and Techniques
III. Experiment and Result
IV. Conclusion .
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