Design and realization of long-period grating devices in conventional and high birefringence fibers and their novel applications as fiber-optic load sensors

Zhang, L.; Liu, Y.; Everall, L.A.; Williams, J.A.R.; Bennion, I.

doi:10.1109/2944.806763

Cited by 76 publications

(49 citation statements)

References 17 publications

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“…16 The result of using such a fiber is that the LPG produces attenuation bands that are insensitive to changes in the surrounding medium's refractive index. The LPG is laid on a carbon fiber ribbon, the arrangement then being encapsulated in a lowtemperature ͑90°C͒ curing silicone rubber.…”

Section: Curvature Sensormentioning

confidence: 99%

Application of long-period-grating sensors to respiratory plethysmography

et al. 2007

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Abstract.A series of in-line curvature sensors on a garment are used to monitor the thoracic and abdominal movements of a human during respiration. These results are used to obtain volumetric tidal changes of the human torso in agreement with a spirometer used simultaneously at the mouth. The curvature sensors are based on long-period gratings ͑LPGs͒ written in a progressive three-layered fiber to render the LPGs insensitive to the refractive index external to the fiber. A curvature sensor consists of the fiber long-period grating laid on a carbon fiber ribbon, which is then encapsulated in a low-temperature curing silicone rubber. The sensors have a spectral sensitivity to curvature, d / dR from ϳ7-nm m to ϳ9-nm m. The interrogation technique is borrowed from derivative spectroscopy and monitors the changes in the transmission spectral profile of the LPG's attenuation band due to curvature. The multiplexing of the sensors is achieved by spectrally matching a series of distributed feedback ͑DFB͒ lasers to the LPGs. The versatility of this sensing garment is confirmed by it being used on six other human subjects covering a wide range of body mass indices. Just six fully functional sensors are required to obtain a volumetric error of around 6%. © 2007 Society of Photo-Optical Instrumentation Engineers.

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Section: Curvature Sensormentioning

confidence: 99%

Application of long-period-grating sensors to respiratory plethysmography

et al. 2007

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“…The LPG (length of ~7cm) is written in a progressive three layered (PTL) fibre, which is inscribed using the point by point method [11]. The result of using such a fibre, is that the LPG produces attenuation bands that are insensitive to changes in the surrounding medium's refractive index.…”

Section: The Curvature Sensormentioning

confidence: 99%

Respiratory Monitoring Using Fibre Long Period Grating Sensors

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et al. 2005

Novel Optical Instrumentation for Biomedical Applications II

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We demonstrate the use of a series of in-line fibre long period grating curvature sensors on a garment, used to monitor the thoracic and abdominal volumetric tidal movements of a human subject. These results are used to obtain volumetric tidal changes of the human torso showing reasonable agreement with a spirometer used simultaneously to record the volume at the mouth during breathing. The curvature sensors are based upon long period gratings written in a progressive three layered fibre that are insensitive to refractive index changes. The sensor platform consists of the long period grating laid upon a carbon fibre ribbon, which is encapsulated in a low temperature curing silicone rubber.

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“…Transverse load sensors based on fiber Bragg gratings (FBGs) and long period gratings (LPGs) made in low-birefringence, hi-birefringence and multi-core fiber have been reported [1][2][3][4]. To function as loading sensors, the majority of these gratings exhibited a pronounced polarization mode split effect resulting from the birefringence induced by the transverse loading.…”

Section: Introductionmentioning

confidence: 99%

All-Fiber Loading Sensor Based on a Hybrid 45° and 81° Tilted Fiber Grating Structure

et al. 2016

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Abstract-We experimentally demonstrate an all-fiber loading sensor system based on a 45°-and an 81°-tilted fiber grating (TFG). We have fabricated two TFGs adjacent to each other in a single fiber to form a hybrid structure. When the transverse load applied to the 81º-TFG, the light coupling to the two orthogonally polarized modes will interchange the power according to the load applied to the fiber, which provides a solution to measure the load. For real applications, we further investigated the interrogation of this all fiber loading sensor system using a low-cost and compact-size single wavelength source and a power meter. The experimental results have clearly shown that a low-cost high-sensitivity loading sensor system can be developed based on the proposed TFG configuration.

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Design and realization of long-period grating devices in conventional and high birefringence fibers and their novel applications as fiber-optic load sensors

Cited by 76 publications

References 17 publications

Application of long-period-grating sensors to respiratory plethysmography

Application of long-period-grating sensors to respiratory plethysmography

Respiratory Monitoring Using Fibre Long Period Grating Sensors

All-Fiber Loading Sensor Based on a Hybrid 45° and 81° Tilted Fiber Grating Structure

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