Design and implementation of an acoustic wave measuring system based on a fiber optic sensor using multimodal interference

Abstract

A system was developed that allows different acoustic parameters to be measured inside the frequency audio range and that can be used in different propagation mediums. A simple configuration of fiber optic sensors based on multimodal interference (MMI) is used, due to the advantages they provide. To perform a spatial and frequency filtering according to the characteristics of the source of interest, a beamformer is applied to the data obtained and then phase sensitive detection is used to obtain the resulting signal. The simulations were made by replicating the existing conditions in the experiments subsequently made in the laboratory. The system showed that the combination of the proposed techniques increases the signal-to-noise ratio even in cases where the ambient noise exceeds the signal of interest several times.

Keywords:

• Fiber optic
• acoustic sensor
• multimodal interference
• phase sensitive detection

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported by Consejo Nacional de Ciencia y Tecnología (CONACYT) through the grant 251319 as well as through its PNPC scholarship program which supported Rodolfo Petrearce Master's and PhD Engineering studies. This work was also supported by PAPIIT-UNAM through the grant IA100120 and DGAPA, UNAM project PAPIIT IT191910 for the support of the infrastructure in the Fiber Optic Sensor Laboratory in Universidad Nacional Autónoma de México.