Dopants concentration effects on the wavelength shift of long-period fiber gratings used as liquid level detectors

2011 ◽  
Author(s):  
Barerem-Melgueba Mao ◽  
Bin Zhou
Keyword(s):  
Liquid Level ◽  
Wavelength Shift ◽  
Concentration Effects ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

scholarly journals Sensing and Demodulation of Special Long-Period Fiber Gratings Induced by ScanningCO2Laser Pulses

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Tao Zhu ◽  
Leilei Shi ◽  
Min Liu ◽  
Wei Huang
Keyword(s):  
Single Mode ◽  
Laser Pulses ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Refractive Index Sensor ◽  
Fiber Gratings ◽  
Long Period ◽  
Investigation Methods ◽  
Long Period Fiber Gratings ◽  
Sensor Strain

A review of long-period fiber gratings (LPFGs) with special structures induced by scanning CO2laser pulses in single mode fiber (SMF) is presented in this paper. In the first part, the special structures and fabrication methods of LPFGs are demonstrated in detail. Next, the special LPFG-based sensors are demonstrated, such as refractive index sensor, strain sensor with temperature compensation, and torsion sensor without temperature crosstalking. Finally, several investigation methods including intensity, wavelength shift, and fiber ring laser demodulation are discussed.

scholarly journals Effect of Low-Doses of Gamma Radiation on Electric Arc-Induced Long Period Fiber Gratings

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2318
Author(s):  
Patricia Mesonero-Santos ◽  
Ana Fernández-Medina ◽  
Luis C. C. Coelho ◽  
Duarte Viveiros ◽  
Pedro A. Jorge ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Arc Discharge ◽  
Single Mode ◽  
Electric Arc ◽  
Good Choice ◽  
Wavelength Shift ◽  
Fiber Gratings ◽  
Space Applications ◽  
Long Period ◽  
Long Period Fiber Gratings

This work presents an experimental study on the effects of gamma radiation on Long Period Fiber Gratings (LPFGs) in a low-dose test campaign to evaluate their eventual degradation. The study was carried out with standard single-mode fibers where the grating was inscribed using the Electric-Arc Discharge (EAD) technique. Before the gamma campaign, a detailed optical characterization was performed with repeatability tests to verify the accuracy of the setup and the associated error sources. The gamma-induced changes up to a dose of 200 krad and the recovery after radiation were monitored with the Dip Wavelength Shift (DWS). The results show that the gamma sensitivity for a total dose of 200 krad is 11 pm/krad and a total DWS of 2.3 nm has been observed with no linear dependence. Post-radiation study shows that recovery from radiation-induced wavelength shift is nearly complete in about 4000 h. Experimental results show that the changes suffered under gamma irradiation of these LPFGs are temporary making them a good choice as sensors in space applications.

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