Fiber Optic based Fabry-Perot Interferometric Sensor Applied for Mechatronic Engineering
Saroj Pullteap ^*
Department of Mechanical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University (Sanam Chandra Palace)

Abstract

This paper presents a development of a fiber optic based Fabry-Perot interferometer (FFPI) for strain measurements. A cantilever beam with connected to a mechanical vibrator has been interfaced to a function generator for the experiments studying. In addition, a reference strain gauge has, also, been employed for studying the measurement errors. However, the experiments have been divided into 2 main parts; using the amplitude excitation, and also frequency excitation in terms of periodic and non-periodic for strain investigations respectively. By choosing a triangular waveform with an excitation frequency of 200 Hz and varying the excitation amplitude from 0.25 V to 6 V, the output strain obtained from the FFPI sensor has been indicated in the range of 0.164 µ – 4.179 µ, while the output from the reference sensor are 0.158 µ – 3.519 µ, leading to an average percentage error of 2.46% occurred. Moreover, the second experiment has been investigated by inputting the excitation frequency in the range of 30 – 180 Hz driven to the vibrator. The experimental results shown that the fiber optic sensor has been detected the strain value in the range of 0.158 – 3.519 µ, with an average error of 2.74% respectively.