Three Lobes Plastic Optical Fiber Bending and Rotation Sensor

Sartiano, Demetrio; Sales, Salvador; Roca, Elena Torres

doi:10.3390/proceedings2019015015

Cited by 1 publication

(2 citation statements)

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“…Additionally to the usual applications of POF to sense changes in strain, temperature, humidity or pressure, for example in structural health monitoring [18], [19], we here present an FBG sensor to detect bending precisely at one spot. Beforehand, this was performed with uneven or asymmetric fibers [2], [5], [20], by multiple fibers [21], by multi-core fibers [2], [22]- [25] or additional optical elements [26]. The new sensor concept presented in this work employs a single multimode fiber and a single FBG for sensing of angular movement in one direction or multiple FBGs at the same position along the optical axis of the fiber (FBG triplets) for sensing of angular movement in 3D (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…the inscription of the FBGs, the connection to an interrogation system and ultimately also the production of the polymer fibers, which is an overall benefit with regard to production time and cost. Compared to that, other approaches require more complex processes for example for the production of fibers [2], [5], [20], [22], the focusing of the laser light on single fiber cores of the multi-core fibers during inscription [2], [23], [25] or the connection to the measurement system based on fiber splicing [22] or fan-outs [24]. We report on production and detection of the eccentric BG under the surface of the graded-index core of a CYTOP fiber and validate the sensitivity for detection of bending in a proof-of-principle experiment.…”

Section: Introductionmentioning

confidence: 99%

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Optical Bend Sensor Based on Eccentrically Micro-Structured Multimode Polymer Optical Fibers

et al. 2021

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We report on a novel bend sensor with high flexibility and elasticity based on Bragg grating structures in polymer optical fibers to detect bending for the measurement of movement. The concept is very simple and relies on the inscription of eccentrical Bragg gratings into multimode graded-index polymer optical fibers via contact exposure with a krypton fluoride excimer laser in the ultraviolet region and an optimized phase mask. Depending on the fiber deformation, the lattice constant of the inscribed Bragg grating is strained or compressed due to its position relative to the fiber core. This in turn results in a specific shift of the Bragg wavelength of up to 1.3 nm to the red or blue wavelength region, respectively, which is sufficiently large to be reliably detected. Therefore, as proof of principle, deformation along one axis can be observed with a single Bragg grating with a maximum sensitivity of up to 65 pm/m −1 . Moreover, multiple Bragg gratings inscribed into the same polymer optical fiber at different positions around the fiber axis allow to determine the shape deformation of the fiber relative to a reference frame with similar accuracy. Consequently, this technology could form the basis for new applications in the areas of medical diagnostics, robotics or augmented reality, which are lacking affordable sensor systems to date.

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