Fiber optic acoustic sensor for the measurement of amplitude and frequency of sound signals with singlemode-multimode-singlemode structure

This paper gives a thorough look at how an intrinsic fiber optic acoustic sensor with a step index SMS structure works, what factors should be considered when designing it, how the experiments should be done, and how well it works. The sensor is specifically designed to accurately monitor both the amplitude and frequency of sound signals. The device consists of an optical light source, a fiber optic structure Singlemode-Multimode-Singlemode (SMS) with a multimode 45?mm length, an audio generator, an output acoustical signal, an oscilloscope, and an optical power meter. The SMS sensor can measure acoustical amplitude ranging from -21.48 to -24.24?dBm, within the frequency range of 30 to 70?Hz The relative error of the measurement is 1.26% and linear correlation we get 0.9688 near to the reference at 0.9936. Inherent optical fiber sensors have several advantages, including their lightweight nature, immunity to electromagnetic interference, and absence of power in the sensing component.