Transverse fiber grating strain sensors based on dual overlaid fiber gratings on polarization-preserving fibers

1998 ◽  
Author(s):  
Eric Udd ◽  
Whitten L. Schulz ◽  
John M. Seim ◽  
Drew V. Nelson ◽  
Alberto Makino
Keyword(s):  
Strain Sensors ◽  
Fiber Grating ◽  
Fiber Gratings ◽  
Transverse Fiber

scholarly journals Development of a Long Period Fiber Grating Interrogation System Using a Multimode Laser Diode

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 749
Author(s):  
Luís Henrique Silva ◽  
Paulo Santos ◽  
Luís C. C. Coelho ◽  
Pedro Jorge ◽  
José Manuel Baptista
Keyword(s):  
Laser Diode ◽  
Measurement Errors ◽  
Laser Scanning ◽  
Fiber Grating ◽  
Light Sources ◽  
Fiber Gratings ◽  
Multimode Laser ◽  
Central Wavelength ◽  
Long Period ◽  
Multimode Laser Diode

Optical fiber gratings have long shown their sensing capabilities. One of the main challenges, however, is the interrogation method applied, since typical systems tend to use broadband light sources with optical spectrum analyzers, laser scanning units or CCD (Charged Coupled Device) spectrometers. The following paper presents the development of an interrogation system, which explores the temperature response of a multimode laser diode, in order to interrogate long period fiber gratings. By performing a spectral sweep along one of its rejection bands, a discrete attenuation spectrum is created. Through a curve fitting technique, the original spectrum is restored. The built unit, while presenting a substantially reduced cost compared with typical interrogation systems, is capable of interrogating along a 10 nm window with measurement errors reaching minimum values as low as 0.4 nm, regarding the grating central wavelength, and 0.4 dB for its attenuation. Given its low cost and reduced dimensions, the developed system shows potential for slow-changing field applications.

A Novel Chirped Fiber Grating Sensor for Strain Detection

2011 ◽  
Vol 94-96 ◽  
pp. 1222-1226
Author(s):  
Hai Ying Yu ◽  
Xiao Liu ◽  
Tong Yu Liu ◽  
Lin Suo ◽  
Ling Song Yu
Keyword(s):  
Light Intensity ◽  
Temperature Compensation ◽  
Low Cost ◽  
Strain Sensor ◽  
Fiber Grating ◽  
Fiber Gratings ◽  
Fiber Grating Sensor ◽  
Chirped Fiber Grating ◽  
Strain Detection ◽  
Chirped Fiber Gratings

In this paper, a novel strain sensor based on chirped fiber grating with temperature compensation is presented. The proposed strain sensor uses double chirped fiber gratings. The temperature compensation exploit the principle that the wavelength shifts of these two chirped fiber gratings induced by temperature is consistent. This strain sensor is demodulated by the light intensity detection with low cost. Furthermore, the strain sensor is simulated in the end of this paper.

scholarly journals Tunable Optical Filter Based on Mechanically Induced Cascaded Long Period Optical Fiber Grating

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Sunita P. Ugale ◽  
Vivekanand Mishra
Keyword(s):  
Optical Fiber ◽  
Optical Filter ◽  
Single Mode ◽  
Fiber Grating ◽  
Fiber Structure ◽  
Fiber Gratings ◽  
Long Period ◽  
Tunable Optical Filter ◽  
Long Period Fiber Gratings ◽  
Optical Fiber Gratings

We have proposed and demonstrated experimentally a novel and simple tunable optical filter based on mechanically induced and cascaded long period optical fiber gratings. In this filter variable FWHM and center wavelength is provided by cascading long period and ultralong period optical fiber gratings with different periods in a novel fiber structure. We report here for the first time to our knowledge the characterization of mechanically induced long period fiber gratings with periods up to several millimeters in novel multimode-single-mode-multimode fiber structure. We have obtained maximum loss peak of around 20 dB.

Fiber Grating Strain Sensors

2003 ◽  
pp. 351-382
Author(s):  
Eric Udd ◽  
Whitten Schulz ◽  
Katy Davol ◽  
Marley Kunzler
Keyword(s):  
Strain Sensors ◽  
Fiber Grating

scholarly journals Sensing Characteristics of Tilted Long Period Fiber Gratings Inscribed by Infrared Femtosecond Laser

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3003 ◽  
Author(s):  
Jian Tang ◽  
Cailing Fu ◽  
Zhiyong Bai ◽  
Changrui Liao ◽  
Yiping Wang
Keyword(s):  
Refractive Index ◽  
Fiber Grating ◽  
Fiber Gratings ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Fs Laser ◽  
Period Fiber Grating ◽  
Application Fields ◽  
Sensing Characteristics

We propose a novel tilted long period fiber grating (TLPFG) design, inscribed using a line-by-line inscription technique and an infrared femtosecond (Fs) laser. The responses of this TLPFG to external refractive index, temperature, torsion, and strain were systematically investigated to determine its sensing characteristics. The external refractive index (RI) was measured to be −602.86 nm/RIU at an RI of ~1.432. The TLPFG was used to accurately measure temperatures up to 450 °C with a sensitivity of 103.8 pm/°C. The torsion and strain sensitivity of the device were 48.94 nm/(rad/mm) and −0.63 pm/µε, respectively. These results demonstrate that the proposed TLPFG could be used as sensors in a series of application fields including high temperatures and external environments.

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