Distributed, Advanced Fiber Optic Sensors

Kher, Sanjay; Saxena, Manoj Kumar

doi:10.5772/intechopen.83622

Cited by 6 publications

(4 citation statements)

References 40 publications

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“…Distributed type of sensing is one where spatial distribution of measurand is measured by time-domain reflectometry. 22 Rayleigh scattering, Raman scattering, and Brillouin scattering work as distributed-based optical sensors, but they are seldom used due to high cost. In the case of point-based sensors, sensing mechanism is performed at a discrete point of the fiber.…”

Section: Optical Engineeringmentioning

confidence: 99%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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Fiber Bragg grating has embraced the area of fiber optics since the early days of its discovery, and most fiber optic sensor systems today make use of fiber Bragg grating technology. Researchers have gained enormous attention in the field of fiber Bragg grating (FBG)-based sensing due to its inherent advantages, such as small size, fast response, distributed sensing, and immunity to the electromagnetic field. Fiber Bragg grating technology is popularly used in measurements of various physical parameters, such as pressure, temperature, and strain for civil engineering, industrial engineering, military, maritime, and aerospace applications. Nowadays, strong emphasis is given to structure health monitoring of various engineering and civil structures, which can be easily achieved with FBG-based sensors. Depending on the type of grating, FBG can be uniform, long, chirped, tilted or phase shifted having periodic perturbation of refractive index inside core of the optical fiber. Basic fundamentals of FBG and recent progress of fiber Bragg grating-based sensors used in various applications for temperature, pressure, liquid level, strain, and refractive index sensing have been reviewed. A major problem of temperature cross sensitivity that occurs in FBG-based sensing requires temperature compensation technique that has also been discussed in this paper.

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Section: Optical Engineeringmentioning

confidence: 99%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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“…Kher et al [69,70] also reported about an LPG written in an endlessly single mode (ESM) photonic crystal fiber (PCF) ESM-12-02 made by Crystal Fiber, Denmark. The grating was fabricated using a CO 2 laser based setup, with a period of 450 µm and presented high strain sensitivity and negligible temperature response in comparison to LPGs in the standard fiber [71].…”

Section: Gamma Irradiation Of Co 2 -Written Lpgsmentioning

confidence: 99%

Radiation Effects on Long Period Fiber Gratings: A Review

Esposito

Srivastava

Campopiano

et al. 2020

Sensors

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Over the last years, fiber optic sensors have been increasingly applied for applications in environments with a high level of radiation as an alternative to electrical sensors, due to their: high immunity, high multiplexing and long-distance monitoring capability. In order to assess the feasibility of their use, investigations on optical materials and fiber optic sensors have been focusing on their response depending on radiation type, absorbed dose, dose rate, temperature and so on. In this context, this paper presents a comprehensive review of the results achieved over the last twenty years concerning the irradiation of in-fiber Long Period Gratings (LPGs). The topic is approached from the point of view of the optical engineers engaged in the design, development and testing of these devices, by focusing the attention on the fiber type, grating fabrication technique and properties, irradiation parameters and performed analysis. The aim is to provide a detailed review concerning the state of the art and to outline the future research trends.

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“…NASA also reported similar works on fiber sensing technologies, in particular a multi-point fiber optic hydrogen micro-sensor system for leak detection for launch vehicles. The system contains chemically reactive coatings whose reflection behaviour changes in proportion to the hydrogen concentration and are used as leak detectors [120].…”

Section: Fiber Optic Sensingmentioning

confidence: 99%

Laser Technology in Photonic Applications for Space

Guilhot

Ribes-Pleguezuelo

2019

Instruments

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The registered history of laser technologies for space application starts with the first laser echoes reflected off the Moon in 1962. Since then, photonic technologies have become very prominent in most technical development. Their presence has also dramatically increased in space applications thanks to the many advantages they present over traditional equivalent devices, such as the immunity against electromagnetic interference, as well as their efficiency and low power consumption. Lasers are one of the key components in most of those applications. In this review, we present an overview of the main technologies involving lasers that are currently deployed in space, before reviewing the requirements for lasers to be reliable in that environment before discussing the advantages and drawbacks of replacing standard technologies by newly developed photonic laser-based devices.

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Distributed, Advanced Fiber Optic Sensors

Cited by 6 publications

References 40 publications

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

Radiation Effects on Long Period Fiber Gratings: A Review

Laser Technology in Photonic Applications for Space

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