High-sensitivity fiber-loop ringdown evanescent-field index sensors using single-mode fiber

2010 ◽  
Vol 35 (10) ◽  
pp. 1629 ◽  
Author(s):  
Chuji Wang ◽  
Chamini Herath
Keyword(s):  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Evanescent Field ◽  
Fiber Loop

High-Sensitivity Temperature Sensor Based on a Coated Single-Mode Fiber Loop

2015 ◽  
Vol 33 (19) ◽  
pp. 4019-4026 ◽  
Author(s):  
Jun He ◽  
Changrui Liao ◽  
Kaiming Yang ◽  
Shen Liu ◽  
Guolu Yin ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fiber Loop

Fabrication, Characterization and Microsensing of Whispering-Gallery Mode Micro-Coupling Systems

2008 ◽  
Author(s):  
Qiulin Ma ◽  
Tobias Rossmann ◽  
Zhixiong Guo
Keyword(s):  
Transmission Loss ◽  
Coupling Efficiency ◽  
High Sensitivity ◽  
Single Mode ◽  
Whispering Gallery Mode ◽  
Single Mode Fiber ◽  
Whispering Gallery ◽  
Coupling System ◽  
Wide Range ◽  
Micro Sensor

An optical micro-coupling system of whispering-gallery mode usually consists of a resonator (e.g. a sphere) and a coupler (e.g. a taper). In this report, silica microspheres of 50–500 μm in diameter are fabricated by hydrogen flame fusing of an end of a single mode fiber or fiber taper. Fiber tapers are fabricated by the method of heating and pulling that meets an adiabatic condition. Taper’s waist diameter can routinely be made less than 1 μm and almost zero transmission loss in a taper is achieved which allows an effective and phase-matched coupling for a wide range sizes of microspheres. Both resonators and couplers’ surface microstructure and shapes are examined by scanning electronic microscopy. Three regimes of coupling are achieved, enabling a good flexibility to control Q value and coupling efficiency of a micro-coupling system. Whispering gallery mode shift is used to demonstrate a novel temperature micro-sensor. Its sensitivity determined from actual experimental results agrees well with the theoretical value. A concept of using the photon’s cavity ring down (CRD) in the microsphere to make a novel high-sensitivity trace gas micro-sensor is proposed. The CRD time constant when ammonia is chosen as the analyte gas is predicted using the simulated absorption lines.

High sensitivity strain sensors based on single-mode-fiber core-offset Mach-Zehnder interferometers

2018 ◽  
Vol 107 ◽  
pp. 202-206 ◽  
Author(s):  
Maria Susana Avila-Garcia ◽  
Marco Bianchetti ◽  
Ronan Le Corre ◽  
Alexis Guevel ◽  
Ruth Ivonne Mata-Chavez ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Strain Sensors ◽  
Fiber Core

scholarly journals A Micro Bubble Structure Based Fabry–Perot Optical Fiber Strain Sensor with High Sensitivity and Low-Cost Characteristics

Sensors ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 555 ◽  
Author(s):  
Lu Yan ◽  
Zhiguo Gui ◽  
Guanjun Wang ◽  
Yongquan An ◽  
Jinyu Gu ◽  
...  
Keyword(s):  
Low Cost ◽  
Strain Sensor ◽  
Glass Tube ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fabry Perot ◽  
Micro Bubble ◽  
Bubble Structure ◽  
Cost Characteristics

A high-sensitivity, low-cost, ultrathin, hollow fiber micro bubble structure was proposed; such a bubble can be used to develop a high-sensitivity strain sensor based on a Fabry–Perot interferometer (FPI). The micro bubble is fabricated at the fiber tip by splicing a glass tube to a single mode fiber (SMF) and then the glass tube is filled with gas in order to expand and form a micro bubble. The sensitivity of the strain sensor with a cavity length of about 155 μm and a bubble wall thickness of about 6 μm was measured to be up to 8.14 pm/μϵ.

scholarly journals Cascaded-Cavity Fabry-Perot Interferometric Gas Pressure Sensor based on Vernier Effect

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3677 ◽  
Author(s):  
Peng Chen ◽  
Yutang Dai ◽  
Dongsheng Zhang ◽  
Xiaoyan Wen ◽  
Minghong Yang
Keyword(s):  
Capillary Tube ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Gas Pressure ◽  
Glass Capillary ◽  
Compact Structure ◽  
Fabry Perot ◽  
Fs Laser ◽  
Vernier Effect

An extrinsic Fabry-Perot interferometer (EFPI) composed of double fiber FP cavities in a glass capillary tube to generate Vernier effect has been fabricated and employed for gas pressure sensing. A lead-in single-mode fiber (LSMF) and a reflective single-mode fiber (RSMF) were inserted into the capillary tube to form a FP cavity. Femtosecond (fs) laser was used to ablate openings on a capillary tube for gas passage to the FP cavity. A fusion hole was also drilled on the end face of a SMF by fs laser. The sensitivity of the sensor is enhanced due to Vernier effect. Experimental results show that the sensitivity was as high as 86.64 nm/MPa in the range of 0~0.6 MPa, which is 32.8 times larger than that of an open-cavity EFPI sensor without Vernier effect. The temperature cross-sensitivity of the sensor was measured to be about 5.18 KPa/°C. The proposed sensor was characterized by its high sensitivity, compact structure and ease of fabrication, and would have extensive application prospects in gas sensing fields.

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