All-Fiber Highly Sensitive Bragg Grating Bend Sensor

Abstract

In this paper, we demonstrated a novel, all-fiber highly sensitive bend sensor based on a four-core fiber rod with a diameter of 2.1 mm. We observed a high resolution of the sensor at a level of 3.6 × 10−3 m−1. Such a sensor design can be used in harsh environments due to the relatively small size and all-fiber configuration, containing no adhesive, nor welded joints.

HER2 biosensing through SPR-envelope tracking in plasmonic optical fiber gratings

“…In the scope of detection, optical fiber sensors find their place in a lot of applications involving real-time and continuous monitoring [1][2][3]. The area of implantation is very wide with plenty of opportunities, in particular for the development of strain, temperature, pressure, chemical and bio-chemical sensors [4][5][6][7][8][9]. Many interesting ways exist to achieve the development of an optical fiber sensor for which the most frequently encountered designs include unclad fibers, U-bent fibers [10], etched fibers [11], tapered fibers [12] and fiber gratings [4][5][6][13][14][15].…”

Study of Intra-Chamber Processes in Solid Rocket Motors by Fiber Optic Sensors

“…Pressure, temperature, deformation, and vibration constitute the most important parameters of the working process in a model SRM chamber. Currently, only a limited number of FOSs are able detect these values [ 28 , 40 , 41 ]. The available data suggests the following requirement: an expected total measurement time of less than 10 seconds; typical oscillation frequencies of intra-chamber processes starting from tens of Hz, increasing to hundreds of kHz.…”

“…The chemical inertness of FOS materials allows them to be used under the influence of aggressive, gaseous, and dusty environments, which are realized during tests of SRM. In addition, FOSs that are made of special radiation-resistant fibers can be used when background radiation is high [ 28 ]. These performance advantages and their constant evolution predict the rapid deployment of fiber sensors in various aerospace applications [ 29 ].…”

Individual inscription of spectrally multiplexed Bragg gratings in optical multicore fibers using small spot direct UV writing

“…These refractive structures cause light of a certain wavelength to constructively interfere and create a characteristic spectral response in transmission and reflection. These gratings are often used for sensing and filtering as their spectral response is sensitive to strain and thermal variations and can be engineered for a specific wavelength, grating reflectivity and grating apodization [1][2][3]. This flexibility makes FBGs ideal filters and sensors for various applications, for example for emission line filtering in astronomy [4,5], vibration monitoring for structural architectures [6] and temperature monitoring in harsh environments [7].…”

“…High thermal stability, chemical inertness, and immunity to electromagnetic interference are key attributes for using FBGs in harsh environments, while their sensitivity to temperature and strain allows them to be deployed as sensors and particularly as bend and shape sensors [3,8,9]. Temperature and strain, however, both vary the nominal wavelength of the Bragg grating, which makes it difficult to separate those effects from each other.…”