Periodical corrugated structure for forming sampled fiber Bragg grating and long-period fiber grating with tunable coupling strength

Lin, Chunn-Yenn; Chern, Gia-Wei; Wang, Lon A.

doi:10.1109/50.939803

Cited by 33 publications

(4 citation statements)

References 21 publications

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“…Thus the coupling strength increases with applied load, with a small change in wavelength of the attenuation bands [22].…”

Section: Lpg Fabricationmentioning

confidence: 98%

“…The modulation of the core refractive index has been achieved by ultraviolet (UV) irradiation [4][5][6][7], ion implantation [8], irradiation by femtosecond pulses in the infrared [9], irradiation by CO 2 lasers [10,11], diffusion of dopants into the core [12,13], relaxation of mechanical stress [14] and electrical discharges [15,16]. The deformation of the fibre has been achieved mechanically [17,18], by tapering the fibre [19] or by deformation of the core [20,21] or cladding [22]. LPGs have been fabricated in photonic crystal fibre by periodically collapsing the holes of the fibre using CO 2 laser heat treatment [23].…”

Section: Lpg Fabricationmentioning

confidence: 99%

“…Typically, the electrodes of a fusion-splicing machine are used, exposing a region of fibre with a length of the order of 100 µm to the arc, limiting the minimum period of LPG that may be fabricated. Chemical etching of the cladding of a fibre to produce a corrugated structure has been shown to allow the generation of an LPG [22]. The corrugated fibre is shown in figure 4.…”

Section: Lpg Fabricationmentioning

confidence: 99%

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Optical fibre long-period grating sensors: characteristics and application

James

Tatam

2003

Meas. Sci. Technol.

1,142

674

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We develop a simple temperature sensing using an optical time domain reflectometer (OTDR) and a mechanical long-period fiber grating (LPFG) fabricated from a heat-shrinkable tube and a metric screw. The resonance loss of the fabricated LPFG is strongly dependent on temperature as temperature-dependent heat-shrinkage of the tube produces a change in the pressure applied to the fiber. In our proposed temperature sensor, the LPFG insertion loss due to a change in the pressure applied to the fiber is measured using an OTDR with a resonance wavelength. Both single-point and multi-point temperature sensing is successfully demonstrated experimentally. "Bend-insensitive ultra short long-period gratings by the electric arc method and their applications to harsh environment sensing and communication ," "High-temperature stability of long-period fibre gratings using an electric arc,"

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“…Thus the coupling strength increases with applied load, with a small change in wavelength of the attenuation bands [22].…”

Section: Lpg Fabricationmentioning

confidence: 98%

Section: Lpg Fabricationmentioning

confidence: 99%

Section: Lpg Fabricationmentioning

confidence: 99%

See 1 more Smart Citation

Optical fibre long-period grating sensors: characteristics and application

James

Tatam

2003

Meas. Sci. Technol.

1,142

674

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“…Adicionalmente, podem-se encontrar métodos baseados na deformação mecânica da fibra (SAVIN et al, 2000;YOKOTA;OKA;YOSHINO, 2002;REGO et al, 2003;UGALE;MISHRA, 2013), na redução gradual do diâmetro da fibra (tapers) (KAKARANTZAS et al, 2001), na deformação do núcleo por meio de um processo de ablação da superfície da fibra seguido de um recozimento (POOLE; PRESBY, 1994; NARAYANAN; PRESBY; VENGSARKAR, 1997) ou de extração da casca da fibra por meio da corrosão controlada para a construção das estruturas periódicas CHERN;WANG, 2001;CHIANG et al, 2010).…”

Section: Métodos De Gravação Da Lpgunclassified

Desenvolvimento de transdutor em fibra óptica com estrutura híbrida LPG-FBG para medição de propriedades térmicas de materiais.

Silva¹

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Silva, pelo auxílio valioso na construção de dispositivos de testes e à Ana Maria de Castro Badiali pela contribuição na padronização do trabalho.Aos meus amigos Djalma César Rocha pela amizade e apoio em diversos momentos desta jornada e ao Ricardo Silveira pela ajuda textual.Aos meus pais Noel Elias da Silva e Ana Orse da Silva pelos ensinamentos e exemplos de força, determinação e humildade. Aos meus filhos Matheus de Almeida Orsi e Silva e Antônio GomesOrse Silva e aos meus sobrinhos Ana Paula Orse Camacho e Gustavo da Silva Oliveira pela paciência e pelos sacrifícios que passamos neste período.À minha amada esposa Kátia Pavani da Silva Gomes pelo esforço hercúleo, paciência, apoio e entendimento, mesmo nos momentos mais difíceis. À Sonia Regina de Oliveira, minha irmã, e ao Celso Antônio de Oliveira, meu cunhado, os meus sinceros agradecimentos, pelos incentivos e apoio.A todos que colaboraram direta e indiretamente, na execução deste trabalho, registro os meus agradecimentos.À CAPES por ter me concedido um apoio financeiro.A DEUS por guiar meus caminhos e me dar força e sustentação. RESUMO ABSTRACTThis work presents the study, implementation, and characterization of transducers composed of a structure formed by Fiber Bragg Gratings (FBG) and Long Period Gratings (LPG) in optical fiber with self-heating coverage for measurement of thermal conductivity and thermal diffusivity of materials based on the Hot-Wire Method (HWM).The self-heating fiber optic device developed in this work is caused by the light of infrared spectrum injected by a pumping laser, which is spread by an LPG and absorbed by a thin metallic film deposited on the surface of the fiber.The transducers are compact, simple, robust and immune to electromagnetic interference.The experimental arrangement using the optical fiber sensor based on LPG-FBG hybrid structure was able to measure the thermal conductivity of atmospheric air and water with accuracies of 27% and 14%, respectively. Several factors were identified that affect the precision and the accuracy of the measures carried out, whereby various forms of corrections are being proposed to improve overall performance.The viability of the original application of the experimental arrangement using the LPG-FBG hybrid device in self-heating optical fiber for the measurement of thermal properties of fluids (air and water) has been successfully demonstrated.

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Novel Fiber Grating for Sensing Applications

Zhang

et al. 2019

Physica Status Solidi (a)

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This review covers some kinds of novel fiber grating and their applications in sensing fields. According to the fiber structures, these novel fiber grating sensors are divided into five types: single mode fiber grating sensors, few-mode fiber grating sensors, multi-core fiber grating sensors, photonic crystal fiber grating sensors, and D-shaped fiber grating sensors. For each kind of fiber grating sensor, both long period fiber grating sensors and fiber Bragg grating sensors are introduced separately, along with their structures, sensing applications, corresponding sensing characteristics, and the advantages and disadvantages in sensing applications.

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Periodical corrugated structure for forming sampled fiber Bragg grating and long-period fiber grating with tunable coupling strength

Cited by 33 publications

References 21 publications

Optical fibre long-period grating sensors: characteristics and application

Optical fibre long-period grating sensors: characteristics and application

Desenvolvimento de transdutor em fibra óptica com estrutura híbrida LPG-FBG para medição de propriedades térmicas de materiais.

Novel Fiber Grating for Sensing Applications

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Periodical corrugated structure for forming sampled fiber Bragg grating and long-period fiber grating with tunable coupling strength

Cited by 33 publications

References 21 publications

Optical fibre long-period grating sensors: characteristics and application

Optical fibre long-period grating sensors: characteristics and application

Desenvolvimento de transdutor em fibra óptica com estrutura hí­brida LPG-FBG para medição de propriedades térmicas de materiais.

Novel Fiber Grating for Sensing Applications

Contact Info

Product

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Desenvolvimento de transdutor em fibra óptica com estrutura híbrida LPG-FBG para medição de propriedades térmicas de materiais.