Spectral characteristics of draw-tower step-chirped fiber Bragg gratings

Idrisov, Ravil; Varzhel, S. V.; Куликов, А. В.; Meshkovskiy, Igor K.; Rothhardt, Manfred; Becker, Martin; Schuster, Kay; Bartelt, Hartmut

doi:10.1016/j.optlastec.2016.01.007

Cited by 11 publications

(5 citation statements)

References 16 publications

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“…The majority of CFBG devices used for sensors are inscribed using the phase mask technique [ 2 , 6 , 56 ], that makes use of a diffractive element and a mid-power UV, KrF, or Ti:sapphire laser to create a refractive index modulation pattern; these standards CFBGs have been used in many applications [ 35 , 36 , 38 , 40 , 45 , 57 ]. An emerging trend in fiber optic sensing is the inscription of CFBGs in non-standard fibers or using specialty phase masks [ 37 , 58 , 59 , 60 , 61 , 62 , 63 ]. The methods and reports on CFBG inscribed for sensing applications are listed in Table 1 , and discussed in this section.…”

Section: Inscription Of Cfbg Sensorsmentioning

confidence: 99%

“…The work of Idrisov et al [ 59 ] attempts at the inscription of a linearly chirped FBG into a glass optical fiber, and it can significantly extend the process industrialized in [ 17 , 51 ] to chirped grating profiles. The technique reported in [ 59 ] implements a step-chirped FBG, which is realized as a cascade of narrow uniform FBGs each having a different index modulation pitch. The result is a spectrum characterized by significant ripples and having 0.5 nm FWHM on a 5 mm grating length, thus achieving a low chirp rate (0.1 nm/mm).…”

Section: Inscription Of Cfbg Sensorsmentioning

confidence: 99%

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Review of Chirped Fiber Bragg Grating (CFBG) Fiber-Optic Sensors and Their Applications

Tosi

2018

Sensors

136

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Fiber Bragg Gratings (FBGs) are one of the most popular technology within fiber-optic sensors, and they allow the measurement of mechanical, thermal, and physical parameters. In recent years, a strong emphasis has been placed on the fabrication and application of chirped FBGs (CFBGs), which are characterized by a non-uniform modulation of the refractive index within the core of an optical fiber. A CFBG behaves as a cascade of FBGs, each one reflecting a narrow spectrum that depends on temperature and/or strain. The key characteristic of CFBGs is that their reflection spectrum depends on the strain/temperature observed in each section of the grating; thus, they enable a short-length distributed sensing, whereas it is possible to detect spatially resolved variations of temperature or strain with resolution on the order of a millimeter over the grating length. Based on this premise, CFBGs have found important applications in healthcare, mechanical engineering, and shock waves analysis, among others. This work reviews the present and emerging trends in CFBG sensors, focusing on all aspects of the sensing element and outlining the application case scenarios for which CFBG sensors have been demonstrated.

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Section: Inscription Of Cfbg Sensorsmentioning

confidence: 99%

Section: Inscription Of Cfbg Sensorsmentioning

confidence: 99%

Review of Chirped Fiber Bragg Grating (CFBG) Fiber-Optic Sensors and Their Applications

Tosi

2018

Sensors

136

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“…For shape sensing of medical catheters and guidewires, OFDR in combination with twisted multicore fiber gratings seems most suitable. Evidently, this is not the only option: various other approaches have been put forward, such as Incoherent OFDR 30 for fiber interrogation, or employing polarization maintaining fiber for the sensors 31 . Efforts have been made to construct a single‐core sensor, for example, by laser writing of waveguide couplers and FBGs in the cladding of standard single‐mode fiber, 32 or utilizing tilted gratings to distinguish bending 33 .…”

Section: Introductionmentioning

confidence: 99%

“…Evidently, this is not the only option: various other approaches have been put forward, such as Incoherent OFDR 30 for fiber interrogation, or employing polarization maintaining fiber for the sensors. 31 Efforts have been made to construct a single‐core sensor, for example, by laser writing of waveguide couplers and FBGs in the cladding of standard single‐mode fiber, 32 or utilizing tilted gratings to distinguish bending. 33 However, these approaches cannot at this time rival the quasi‐continuous shape sensing with submillimeter resolution, combined with industrialized production of sensing fibers, that multicore OFDR offers.…”

Section: Introductionmentioning

confidence: 99%

Shape accuracy of fiber optic sensing for medical devices characterized in bench experiments

et al. 2021

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Purpose: Fiber Optic RealShape (FORS) is a new technology that visualizes the full threedimensional shape of medical devices, such as catheters and guidewires, using an optical fiber embedded in the device. This three-dimensional shape provides guidance to clinicians during minimally invasive procedures, and enables intuitive navigation. The objective of this paper is to assess the accuracy of the FORS technology, as implemented in the current state-of-the-art Philips FORS system. The FORS system provides the shape of the entire device, including tip location and orientation. We consider all three aspects. Methods: In bench experiments, we determined the accuracy of the location and orientation of the tip by displacing and rotating the fiber end, while allowing the rest of the fiber to change shape freely. To test the accuracy of the full shape, we have placed the fiber in a groove, which was accurately machined in a thick, stiff metal "path plate." We then compared the reconstructed shape with the known shape of the groove. Results: The tip location is found with submillimeter accuracy, and the orientation is sensed with milliradian accuracy. The shape of a fiber in the path plate faithfully follows the known shape of the groove, with typical deviation less than 0.5 mm in the plane of the plate. Out of plane accuracy, perhaps slightly less relevant clinically, is more challenging, due to the influence of twist; yet even out of the plane, the deviation is only submillimeter. Conclusion:The technology achieves submillimeter precision and provides full three-dimensional shape, surpassing the reported precision of other navigation and tracking technologies, and therefore may potentially alleviate the need for fluoroscopy.

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“…The fabrication of draw tower gratings received increased attention recently due to the premise of long FBG array for sensing, fabricated directly from the fibre tower [56][57][58]. These methods use high energy pulses either from a UV laser or a femtosecond laser in a holographic configuration as discussed earlier.…”

Section: On Tower Inscription Techniquementioning

confidence: 99%

Advanced applications of periodic fibre structures in chemical sensing

Tan¹

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Spectral characteristics of draw-tower step-chirped fiber Bragg gratings

Cited by 11 publications

References 16 publications

Review of Chirped Fiber Bragg Grating (CFBG) Fiber-Optic Sensors and Their Applications

Review of Chirped Fiber Bragg Grating (CFBG) Fiber-Optic Sensors and Their Applications

Shape accuracy of fiber optic sensing for medical devices characterized in bench experiments

Advanced applications of periodic fibre structures in chemical sensing

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