Application of the Transmission Bragg Gratings for Vibration Monitoring

TL;DR

This paper demonstrates a vibration monitoring system using transmission Bragg gratings combined with a laser and sensitive mirror, modeled mathematically to analyze response characteristics including frequency doubling effects.

Contribution

It introduces a novel vibration sensor design based on transmission Bragg gratings and provides a mathematical model to predict its response behavior.

Findings

The system can detect vibrations through laser beam divergence exceeding.

Mathematical model accurately describes system response.

Response doubles the modulation frequency relative to vibrations.

Abstract

It is shown that the optical-electronic system consisted of the transmission Bragg grating, a laser and the intermediate sensitive to the vibrations mirror can detect the vibrations, when touched by them laser beam scan will exceed the angular divergence of the beam. The mathematical model of the sensor of the vibrations presented in the form of Taylor series describes the system response taking into account the operating point, in particular, describes the effect of the doubling of the modulation frequency response relative to the frequency of acting vibrations.