High sensitivity microbend sensor based on anti-resonant hollow-core fiber

2020 ◽  
Author(s):  
Donglai An ◽  
Xu Chen ◽  
Yingying Wang ◽  
Shoufei Gao ◽  
Xia Yu
Keyword(s):  
High Sensitivity ◽  
Hollow Core ◽  
Core Fiber

scholarly journals In-Fiber BaTiO3 Microsphere Resonator for High-Sensitivity Temperature Measurement

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 318
Author(s):  
Chi Li ◽  
Meng Zhu ◽  
Peng Ji ◽  
Cong Xiong ◽  
Changrui Liao
Keyword(s):  
Fiber Optic ◽  
Temperature Response ◽  
High Sensitivity ◽  
Single Mode ◽  
Whispering Gallery Mode ◽  
Transmission Spectra ◽  
Hollow Core ◽  
Polymer Waveguide ◽  
Whispering Gallery ◽  
Core Fiber

A fiber optic whispering gallery mode (WGM) resonator was proposed and realized by integrating an inline polymer waveguide with a microsphere mounted on it. The polymer waveguide with a diameter of 1 μm was printed with femtosecond laser-assisted multiphoton polymerization in a section of a grooved hollow-core fiber, which was sandwiched between two single-mode fibers. Two WGW resonators assembled with microspheres of different sizes were prepared. The transmission spectra of those stimulated WGMs were investigated both in simulation and experimentally. The temperature response of the resonators was particularly studied, and a linear sensitivity of −593 pm/°C was achieved from 20 °C to 100 °C.

scholarly journals Liquid Crystal-Embedded Hollow Core Fiber Temperature Sensor in Fiber Ring Laser

2021 ◽  
Vol 11 (15) ◽  
pp. 7103
Author(s):  
Weihao Lin ◽  
Shengjie Zhou ◽  
Yibin Liu ◽  
Mang I. Vai ◽  
Liyang Shao
Keyword(s):  
Liquid Crystal ◽  
Temperature Variation ◽  
Temperature Sensor ◽  
Ring Laser ◽  
High Sensitivity ◽  
Microbial Culture ◽  
Hollow Core ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Core Fiber

An optical fiber temperature sensor based on Mach–Zehnder interferometer and thermo-optic effect of the liquid crystal (LC) in fiber ring laser (FRL) system is proposed and experimentally demonstrated. The LC is infiltrated into the core of hollow core fiber, and the resonant wavelength is more sensitive to temperature variation due to the interaction between the incident light and the cavity infiltrating liquid crystal with high thermal light coefficient. Meanwhile, the FRL system was further used to make the sensor have good performance in the case of high signal-to-noise ratio (∼35 dB), narrow half-height width (FWHM = 0.15 nm), and high sensitivity in the temperature range from 20 °C to 50 °C, with the maximum sensitivity of 1.318 nm/°C. As far as we know, in the FRL system, the liquid crystal material has a better temperature sensing performance than the previous fiber. Nevertheless, the system has the advantages of good repeatability, low cost, simple production, small volume, high sensitivity. In marine microbial culture and detection, it is necessary to carry out high sensitivity measurement within a small temperature variation range. This reliable and excellent temperature performance has a potential application prospect.

scholarly journals Dual-Core Fiber-Based Interferometer for Detection of Gas Refractive Index

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 111
Author(s):  
Haijin Chen ◽  
Xuehao Hu ◽  
Meifan He ◽  
Qianqing Yu ◽  
Zhenggang Lian ◽  
...  
Keyword(s):  
Refractive Index ◽  
Low Cost ◽  
High Sensitivity ◽  
Narrow Slit ◽  
Hollow Core ◽  
Fiber Sensors ◽  
Air Core ◽  
Flow Through ◽  
Core Fiber ◽  
Dual Core

We demonstrate a dual-core fiber-based Mach–Zehnder interferometer that could be used for precise detection of variations in refractive indices of gaseous samples. The fiber used here have a solid germanium-doped silica core and an air core that allows gases to flow through. Coherent laser beams are coupled to the two cores, respectively, and thus excite guiding modes thereby. Interferogram would be produced as the light transmitted from the dual cores interferes. Variations in refractive index of the hollow core lead to variations in phase difference between the modes in the two cores, thus shifting the interference fringes. The fringe shifts can be then interrogated by a photodiode together with a narrow slit in front. The resolution of the sensor was found to be ~1 × 10−8 RIU, that is comparable to the highest resolution obtained by other fiber sensors reported in previous literatures. Other advantages of our sensor include very low cost, high sensitivity, straightforward sensing mechanism, and ease of fabrication.

High sensitivity liquid level sensor based on a hollow core fiber structure

2021 ◽  
pp. 127279
Author(s):  
Lifeng Bao ◽  
Xinyong Dong ◽  
Perry Ping Shum ◽  
Changyu Shen
Keyword(s):  
High Sensitivity ◽  
Liquid Level ◽  
Hollow Core ◽  
Fiber Structure ◽  
Level Sensor ◽  
Core Fiber ◽  
Liquid Level Sensor

scholarly journals Sensitivity Enhancement of Curvature Fiber Sensor Based on Polymer-Coated Capillary Hollow-Core Fiber

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3763 ◽  
Author(s):  
Luis A. Herrera-Piad ◽  
Iván Hernández-Romano ◽  
Daniel A. May-Arrioja ◽  
Vladimir P. Minkovich ◽  
Miguel Torres-Cisneros
Keyword(s):  
Fiber Optic ◽  
High Sensitivity ◽  
Single Mode ◽  
Cost Effective ◽  
Fiber Optic Sensor ◽  
Hollow Core ◽  
Sensing Applications ◽  
Optic Sensor ◽  
Wide Range ◽  
Core Fiber

In this paper, we propose and experimentally demonstrate a simple technique to enhance the curvature sensitivity of a bending fiber optic sensor based on anti-resonant reflecting optical waveguide (ARROW) guidance. The sensing structure is assembled by splicing a segment of capillary hollow-core fiber (CHCF) between two single-mode fibers (SMF), and the device is set on a steel sheet for measuring different curvatures. Without any surface treatment, the ARROW sensor exhibits a curvature sensitivity of 1.6 dB/m−1 in a curvature range from 0 to 2.14 m−1. By carefully coating half of the CHCF length with polydimethylsiloxane (PDMS), the curvature sensitivity of the ARROW sensor is enhanced to −5.62 dB/m−1, as well as an increment in the curvature range (from 0 to 2.68 m−1). Moreover, the covered device exhibits a low-temperature sensitivity (0.038 dB/°C), meaning that temperature fluctuations do not compromise the bending fiber optic sensor operation. The ARROW sensor fabricated with this technique has high sensitivity and a wide range for curvature measurements, with the advantage that the technique is cost-effective and easy to implement. All these features make this technique appealing for real sensing applications, such as structural health monitoring.

scholarly journals A Review of Antiresonant Hollow-Core Fiber-Assisted Spectroscopy of Gases

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5640
Author(s):  
Piotr Jaworski
Keyword(s):  
High Sensitivity ◽  
Gas Absorption ◽  
Hollow Core ◽  
Low Loss ◽  
Promising Alternative ◽  
Long Term Stability ◽  
Air Core ◽  
Core Fiber ◽  
Significant Attention

Antiresonant Hollow-Core Fibers (ARHCFs), thanks to the excellent capability of guiding light in an air core with low loss over a very broad spectral range, have attracted significant attention of researchers worldwide who especially focus their work on laser-based spectroscopy of gaseous substances. It was shown that the ARHCFs can be used as low-volume, non-complex, and versatile gas absorption cells forming the sensing path length in the sensor, thus serving as a promising alternative to commonly used bulk optics-based configurations. The ARHCF-aided sensors proved to deliver high sensitivity and long-term stability, which justifies their suitability for this particular application. In this review, the recent progress in laser-based gas sensors aided with ARHCFs combined with various laser-based spectroscopy techniques is discussed and summarized.

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