Fabry-Perot interferometric sensor to measuring vibrations in mechanical structures based on the Doppler effect

Josue E. Muñoz-Pérez; Francisco M. Muñoz-Pérez; J. Gabriel Ortega-Mendoza; Placido Zaca-Morán; José Luis Cruz; Miguel V. Andrés

doi:10.1117/12.2594979

11 August 2021 Fabry-Perot interferometric sensor to measuring vibrations in mechanical structures based on the Doppler effect

Josue E. Muñoz-Pérez, Francisco M. Muñoz-Pérez, J. Gabriel Ortega-Mendoza, Placido Zaca-Morán, José Luis Cruz, Miguel V. Andrés

Author Affiliations +

Proceedings Volume 11817, Applied Optical Metrology IV; 118170D (2021) https://doi.org/10.1117/12.2594979
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

A simple and inexpensive method to measure vibrations in mechanical structures is presented by means of Fabry-Perot interferometry and Doppler effect. The sensor consists of a transparent hydrogel sphere attached to an single-mode optical fiber from a 50:50 fiber coupler, laser light with a wavelength of 658 nm, and a photodetector which is connected to an oscilloscope. The vibrometric sensor works in the time domain by detecting the number of interference fringes. The tip of the prototype is composed of mechanical couplings that join the fiber with the hydrogel sphere. The sensor allows knowing the vibration frequency at which a mechanical part is oscillating. The analysis presented in this work shows several advantages over conventional methods, such as low cost, real-time measurement, and simplification in experimental setup. The sensor system is capable of capturing vibrations of up to 5000 Hz.

Citation Download Citation

Josue E. Muñoz-Pérez, Francisco M. Muñoz-Pérez, J. Gabriel Ortega-Mendoza, Placido Zaca-Morán, José Luis Cruz, and Miguel V. Andrés "Fabry-Perot interferometric sensor to measuring vibrations in mechanical structures based on the Doppler effect", Proc. SPIE 11817, Applied Optical Metrology IV, 118170D (11 August 2021); https://doi.org/10.1117/12.2594979

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