Fiber Bragg Grating-Based Fabry-Perot Interferometer Sensor for Damage Detection on Thin Aluminum Plate

Real-time monitoring of large marine structures’ health, including drilling platforms, submarine pipelines, dams, and ship hulls, is greatly needed. Among the various kinds of monitoring methods, optical fiber sensors (OFS) have gained a lot of concerns and showed several distinct advantages, such as small size, high flexibility and durability, anti-electromagnetic interference, and high transmission rate. In this paper, three types of OFS used for marine structural health monitoring (SHM), including point sensing, quasi-distributed sensing, and distributed sensing, are reviewed. Emphases are given to the applicability of each type of the sensors by analyzing the operating principles and characteristics of the OFSs. The merits and demerits of different sensing schemes are discussed, as well as the challenges and future developments in OFSs for the marine SHM field.

Section: Typical Applications Of Ofss For Marine Shmmentioning

confidence: 99%

Marine Structural Health Monitoring with Optical Fiber Sensors: A Review

Chen

Wang

Zhang

et al. 2023

“…The higher SNR achieved by the setup allows for better damage detection. A similar concept has been employed by Ismail et al [167]. The additional wave packet due to the damage, the delay in the time of arrival, and change in the amplitude were used for detecting a slot type damage in an isotropic structure.…”

Section: Acousto-ultrasonicmentioning

confidence: 99%

Optical Fiber Sensors for Ultrasonic Structural Health Monitoring: A Review

Soman

Wee

Peters

2021

Guided waves (GW) and acoustic emission (AE) -based structural health monitoring (SHM) have widespread applications in structures, as the monitoring of an entire structure is possible with a limited number of sensors. Optical fiber-based sensors offer several advantages, such as their low weight, small size, ability to be embedded, and immunity to electro-magnetic interference. Therefore, they have long been regarded as an ideal sensing solution for SHM. In this review, the different optical fiber technologies used for ultrasonic sensing are discussed in detail. Special attention has been given to the new developments in the use of FBG sensors for ultrasonic measurements, as they are the most promising and widely used of the sensors. The paper highlights the physics of the wave coupling to the optical fiber and explains the different phenomena such as directional sensitivity and directional coupling of the wave. Applications of the different sensors in real SHM applications have also been discussed. Finally, the review identifies the encouraging trends and future areas where the field is expected to develop.

“…However, the resolution is limited by the large bandwidth (0.1–1 nm) of the FBG. Early works have constructed FPI sensors using two similar FBGs inscribed nearby [ 13 , 14 , 15 ], resulting in a narrower bandwidth of the tagged peak/dip within the spectrum while the FSR of the spectrum is reduced accordingly, restricting the dynamic range of the sensor. As such, new spectral interrogation methods are requisite for simultaneous high-resolution and large dynamic range sensing applications.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution and Large-Dynamic Range Fiber-Optic Sensors Based on Dual-Mode Direct Spectrum Interrogation Method

Zhou,

Zhang,

Cui

et al. 2024

Conventional optical fiber temperature/strain sensors often have to make compromises between the resolution and the dynamic range. Here we present a new method that meets the measurement requirements for both high resolution and large dynamic range. A high-quality optical fiber Fabry-Perot Interferometer (FPI) constructed using a pair of chirped fiber Bragg gratings is employed as the sensor and a dual-mode direct spectrum interrogation method is proposed to identify the small drift of external temperature or strain. As a proof-of-concept illustration, a temperature resolution of 0.2 °C within 30–130 °C is demonstrated. For strain sensing, the resolution can be 10 µε within 0–1000 µε. The measurement resolution can be improved further by routinely increasing the reflectivity of the CFBG and the cavity length and the sensor can also be mass-produced. This new sensing schema not only resolves the conflict between the resolution and the dynamic range of fiber-optic temperature/strain sensors but can also be extended to other sensors and measurands.