Excessively Tilted Fiber Grating Sensors

Sun, Yuezhen; Yan, Zhijun; Zhou, Kaiming; Luo, Binbin; Jiang, Biqiang; Mou, Chengbo; Sun, Qizhen; Zhang, Lin

doi:10.1109/jlt.2020.3048981

Cited by 15 publications

(3 citation statements)

References 62 publications

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“…With the recent development of optical testing technology and fiber-optic communication technology, optical sensing technology, which uses optical fibers as a carrier to sense and transmit environmental parameters through light wave signals, was also applied to hydrogen concentration detection, which can also be generally referred to as fiber-optic type sensors [58][59][60][61]. Catalytic and electrical hydrogen sensors can respond quickly and accurately to hydrogen concentration at room temperature and pressure and are currently used in; however, these sensors, which are based on electrical characteristics, may generate sparks during use and have the potential to cause hydrogen explosions, which are a safety hazard.…”

Section: Fiber-optic Hydrogen Sensorsmentioning

confidence: 99%

A Review of Hydrogen Sensors for ECLSS: Fundamentals, Recent Advances, and Challenges

et al. 2023

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The development of hydrogen sensors with high detection accuracy, fast response times, long calibration periods, and good stability has become the focus of the space station environmental control and life support subsystem. We analyze the current research status of different types of hydrogen sensors, including catalyst combustion type, heat conduction type, semiconductor type, fiber optic type, etc. The response signals of most hydrogen sensors are affected by temperature and humidity, resulting in cross-sensitivity. Reducing the cross-sensitivity of temperature, humidity, and other interfering factors to achieve accurate hydrogen measurement in different environments is a challenge that limits the development of hydrogen sensors. Several hydrogen sensors that are currently commercially available have a narrow operating temperature range, most of them can only measure at room temperature, and high-temperature environments require a higher accuracy and lifetime of the sensor than required at room temperature. Many new hydrogen-sensitive materials were developed to improve the performance of the sensors. The excellent performance of fiber-optic hydrogen sensors is beneficial to temperature compensation and distributed multiparameter measurement, as well as to the research and development of intelligent sensing systems, in the context of the Internet of Things. The signal detection and demodulation techniques of fiber-optic sensors are the focus of future hydrogen sensor research.

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Section: Fiber-optic Hydrogen Sensorsmentioning

confidence: 99%

A Review of Hydrogen Sensors for ECLSS: Fundamentals, Recent Advances, and Challenges

et al. 2023

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“…Gratings are periodic structures fabricated on the fiber core, enabling the interaction of light with the surrounding environment. In recent years, fiber optic grating technology has evolved to include several grating types, including fiber Bragg grating (FBG) [ 7 , 8 , 9 ], long-period fiber grating (LPFG) [ 10 ] and tilted fiber grating (TFG) [ 11 , 12 ]. Compared with the above-mentioned optical fiber grating, the excessively tilted fiber grating (Ex-TFG) shows a series of orthogonal polarization dual peaks in the transmission spectrum and exhibits a high surrounding refractive index (SRI) sensitivity with low temperature crosstalk.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser Inscribed Excessively Tilted Fiber Grating for Humidity Sensing

Jing,

Liu,

Liu

et al. 2024

Sensors

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We propose a humidity sensor using an excessively tilted fiber grating (Ex-TFG) coated with agarose fabricated using femtosecond laser processing. The processed grating showcases remarkable differentiation between TE and TM modes, achieving an exceptionally narrow bandwidth of approximately 1.5 nm and an impressive modulation depth of up to 15 dB for both modes. We exposed the agarose-coated TFG sensor to various relative humidity levels and monitored the resonance wavelength to test its humidity sensing capability. Our findings demonstrated that the sensor exhibited a rapid response time (2–4 s) and showed a high response sensitivity (18.5 pm/%RH) between the humidity changes and the resonant wavelength shifts. The high sensitivity, linearity, repeatability, low hysteresis, and excellent long-term stability of the TFG humidity sensor, as demonstrated in our experimental results, make it an attractive option for environmental monitoring or biomedical diagnosis.

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“…In more recent years, fiber gratings with tilted fringes have attracted a lot of attention. Various tilted structures with small [5] , Brewster [6,7] , and large [8] angles have been studied. They exhibit excellent performance in sensors [9][10][11] and in fiber lasers [12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental analysis of second order Bragg resonance of 45° TFG and its fiber laser application

Song

Ye²,

Xiao

et al. 2022

Chin. Opt. Lett.

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We report the observation of second order Bragg resonance (2nd-OBG) produced by tilted fiber gratings (TFGs) fabricated using phase mask UV inscription. The theoretical analysis has revealed that the generation of high order Bragg resonance of gratings is induced by a square-shape refractive index profile, which is caused by over-saturated UV exposure. In the experiment, we have studied the TFGs with different tilt angles under over-saturated UV exposure, in which all gratings have showed the 2nd-OBR, and the larger tilt angle of the grating has the stronger 2nd-OBR. When the tilt angle of the grating is ∼45°, the Bragg resonance exhibits very strong polarization dependence, because the 2nd-OBR wavelength is located within the polarizing bandwidth of 45°TFG. Finally, we have demonstrated an erbium-doped fiber laser with > 99.9% degree of polarization, and, by applying mechanical stretching on the grating, a wavelength tunable laser output has been achieved. The output laser shows ∼0.2 dB amplitude variation within 1 h continuous monitoring of the laser.

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Excessively Tilted Fiber Grating Sensors

Cited by 15 publications

References 62 publications

A Review of Hydrogen Sensors for ECLSS: Fundamentals, Recent Advances, and Challenges

A Review of Hydrogen Sensors for ECLSS: Fundamentals, Recent Advances, and Challenges

Femtosecond Laser Inscribed Excessively Tilted Fiber Grating for Humidity Sensing

Theoretical and experimental analysis of second order Bragg resonance of 45° TFG and its fiber laser application

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