Fiber Bragg Grating temperature monitoring of helicopter engine mechanical parts on an engine test bench

Quelene, Jean-Baptiste; Salhi, Nassim; Desmarcheliers, Rudy; Huy, Minh-Chau Phan; Cotillard, R.; Rougeault, S.; Pohl, Didier; Laffont, Guillaume

doi:10.1364/ofs.2022.w4.16

Cited by 1 publication

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“…CEA List femtosecond platform allows for fabrication of FBGs [1,2] by focusing laser pulses into fiber optic core. When a sufficient power threshold is reached (~10 14 W/cm 2 ) [3], a laser pulse creates a local plasma in glass that finally results in a micro-void surrounded by a densified shell.…”

Section: Optimization Of Micro-void Antenna Fabrication Processmentioning

confidence: 99%

“…Femtosecond laser point-by-point writing enables fabrication of Fiber Optic Sensors (FOS) such as Fiber Bragg Gratings (FBG) [1,2] for temperature, strain or pressure monitoring in harsh environments like radiation [3] or high temperature [1,2]. Indeed, focusing of femtosecond laser pulses deep into the fiber's core creates micro-voids surrounded by a shell of densified silica [3] that can form an FBG when disposed periodically along the optical fiber with point-by-point distances of the order of ~0.5-1 µm or more.…”

Section: Introductionmentioning

confidence: 99%

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Compact fiber optic spectrometers formed by chirped diffraction gratings inscribed with a femtosecond laser platform

Quelene

Marti

Cotillard

et al. 2023

Optical Components and Materials XX

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Femtosecond laser point-by-point writing is a commonly used method for fabrication of Fiber Bragg Grating sensors dedicated to harsh environments, such as high temperature or irradiation. In addition, a femtosecond laser platform allows for inscription of compact fiber optic diffraction gratings that consist of micro-voids or filaments formed into the fiber core and cladding by focusing laser pulses using microscope objectives. Light propagating in the fiber is coupled to radiation modes due to Mie scattering, thus providing wavelength dispersion in free space. Chirping the grating period further allows focusing of the outcoupled light in a given plane. Such an all-fiber focusing grating forms a compact photonic device permitting its use for FBG sensor interrogation. In this paper, fabrication of such spectrometers operating at 850 and 1550 nanometers is described. A characterization setup allowing measurements of spectra of FBGs at those wavelength bands is presented, and results corresponding to various focusing distances, grating lengths and chosen microscope objectives are exposed. Azimuthal distribution of scattered light is discussed, as well as focusing distance versus grating period chirp and spectrometer resolution versus grating length. Finally, spectra reflected by pointby- point FBG sensors are presented, thus demonstrating the great potential interest of such gratings for FBG interrogation.

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Section: Optimization Of Micro-void Antenna Fabrication Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact fiber optic spectrometers formed by chirped diffraction gratings inscribed with a femtosecond laser platform

Quelene

Marti

Cotillard

et al. 2023

Optical Components and Materials XX

Self Cite

View full text Add to dashboard Cite

show abstract

Fiber Bragg Grating temperature monitoring of helicopter engine mechanical parts on an engine test bench

Abstract: Fiber Bragg Grating temperature monitoring results of two mechanical parts located in the exhaust system of a helicopter engine test bench are reported and compared to thermocouple and SWIR camera measurements.

Cited by 1 publication

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Compact fiber optic spectrometers formed by chirped diffraction gratings inscribed with a femtosecond laser platform

Compact fiber optic spectrometers formed by chirped diffraction gratings inscribed with a femtosecond laser platform

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