Simultaneous Measurement of Temperature and Strain using PANDA Fiber Grating

Sudo, Masaaki; Nakai, Masaaki; Himeno, K.; Suzaki, S.; Wada, Akira; Yamauchi, R.

doi:10.1364/ofs.1997.owc7

Cited by 38 publications

(17 citation statements)

References 2 publications

(3 reference statements)

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“…However, when temperature and strain simultaneously affect an FBG, the measurement of the wavelength shift does not provide temperature-insensitive strain measurement. To discriminate these two contributions, structures such as two FBGs, superimposed FBGs 2 , hybrid FBG with long period grating 3 and high birefringence FBGs 4 are required but they increase the complexity of the sensors.…”

Section: Introductionmentioning

confidence: 99%

Use of weakly tilted fiber Bragg gratings for sensing purposes

Caucheteur

Chen

Albert

et al. 2008

Optical Sensors 2008

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Weakly tilted fiber Bragg gratings with gratings planes tilted at small angles with respect to the fiber axis couple light to backward going core mode and cladding modes. Their transmitted spectrum is characterized by narrow resonance dips below the Bragg wavelength corresponding to the core mode coupling. The amplitude spectral evolutions of weakly tilted fiber Bragg gratings in response to diverse physical perturbations such as temperature, mechanical strains, bending and surrounding refractive index changes are presented. Different techniques allowing to efficiently correlate the spectral evolution with the information to be measured are reported. We demonstrate that a selective monitoring of one cladding mode shift with respect to the Bragg wavelength gives temperature-insensitive strain measurements whereas a global monitoring of the cladding modes spectrum offers temperature-insensitive surrounding refractive index measurements. We also point out the possibility of using this global monitoring for bending and transverse strain sensing purposes. Finally, we present the effect of coating (the grating is covered by a polymer) on the sensitivity of weakly tilted fiber Bragg grating to surrounding refractive index changes. For every application, the performances of weakly tilted fiber Bragg gratings sensors are discussed.

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Section: Introductionmentioning

confidence: 99%

Use of weakly tilted fiber Bragg gratings for sensing purposes

Caucheteur

Chen

Albert

et al. 2008

Optical Sensors 2008

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“…As in the previous solution, using different wavelengths provides different sensitivities. In both cases, a broadband optical source or different narrowband optical sources are needed, increasing the cost of the demodulation technique.Use of specialty optical fibers (polarization maintaining fibers [17,18] or photonic crystal fibers [19,20]) that yield a very well-conditioned system. Here, attention has to be paid on the splicing between specialty and standard fibers as well as on the injection of light.…”

Section: Discrimination Between Temperature and Strain Effectsmentioning

confidence: 99%

Fiber Bragg Grating Sensors toward Structural Health Monitoring in Composite Materials: Challenges and Solutions

Kinet

Mégret

Goossen

et al. 2014

Sensors

437

237

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Nowadays, smart composite materials embed miniaturized sensors for structural health monitoring (SHM) in order to mitigate the risk of failure due to an overload or to unwanted inhomogeneity resulting from the fabrication process. Optical fiber sensors, and more particularly fiber Bragg grating (FBG) sensors, outperform traditional sensor technologies, as they are lightweight, small in size and offer convenient multiplexing capabilities with remote operation. They have thus been extensively associated to composite materials to study their behavior for further SHM purposes. This paper reviews the main challenges arising from the use of FBGs in composite materials. The focus will be made on issues related to temperature-strain discrimination, demodulation of the amplitude spectrum during and after the curing process as well as connection between the embedded optical fibers and the surroundings. The main strategies developed in each of these three topics will be summarized and compared, demonstrating the large progress that has been made in this field in the past few years.

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“…These solutions do not yield a localized sensor and often contain splices inside the composite material, which are poorly resilient. Solutions based on specialty optical fibres (FBGs written into polarization maintaining fibres 7,8 or microstructured optical fibers 9 ) give a very well conditioned system but they remain expensive, somewhat difficult to splice with standard optical fiber and require a tight control of the input state of polarization. A pre-treatment 10,11,12 of the sensors (placement of a special coating, partial etching or encapsulating) are other possibilities to distinguish strain and temperature effects.…”

Section: Introductionmentioning

confidence: 99%

Temperature and strain effects discrimination inside composite materials with embedded weakly tilted fibre Bragg grating

et al. 2013

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Fibre Bragg gratings (FBGs) are strain sensors that can be embedded into composite materials, without affecting their mechanical performances. In this study, we report the use of a short and weakly tilted FBG inscribed in a single mode highly germanium doped photosensitive optical fibre to discriminate, with a good spatial resolution, strain and temperature effects for structural health monitoring (SHM) application. The transmission spectrum of a weakly tilted FBG (TFBG) presents three regions of interest: the Bragg resonance, the ghost mode resonance and all other cladding mode resonances that are not exploited in this work. We make use of the differential temperature sensitivity of the Bragg mode and the ghost mode to discriminate between temperature and strain effects inside composite materials.

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Simultaneous Measurement of Temperature and Strain using PANDA Fiber Grating

Cited by 38 publications

References 2 publications

Use of weakly tilted fiber Bragg gratings for sensing purposes

Use of weakly tilted fiber Bragg gratings for sensing purposes

Fiber Bragg Grating Sensors toward Structural Health Monitoring in Composite Materials: Challenges and Solutions

Temperature and strain effects discrimination inside composite materials with embedded weakly tilted fibre Bragg grating

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