scholarly journals In-Fiber Collimator-Based Fabry-Perot Interferometer with Enhanced Vibration Sensitivity

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 435 ◽  
Author(s):  
Bin Du ◽  
Xizhen Xu ◽  
Jun He ◽  
Kuikui Guo ◽  
Wei Huang ◽  
...  
Keyword(s):  
Low Cost ◽  
Single Mode ◽  
Vibration Sensor ◽  
Vibration Monitoring ◽  
Static Displacement ◽  
Vibration Sensitivity ◽  
Graded Index ◽  
Fabry Perot ◽  
Displacement Sensitivity ◽  
Fiber Collimator

A simple vibration sensor is proposed and demonstrated based on an optical fiber Fabry-Perot interferometer (FPI) with an in-fiber collimator. The device was fabricated by splicing a quarter-pitch graded index fiber (GIF) with a section of a hollow-core fiber (HCF) interposed between single mode fibers (SMFs). The static displacement sensitivity of the FPI with an in-fiber collimator was 5.17 × 10−4 μm−1, whereas the maximum static displacement sensitivity of the device without collimator was 1.73 × 10−4 μm−1. Moreover, the vibration sensitivity of the FPI with the collimator was 60.22 mV/g at 100 Hz, which was significantly higher than the sensitivity of the FPI without collimator (11.09 mV/g at 100 Hz). The proposed FPI with an in-fiber collimator also exhibited a vibration sensitivity nearly one order of magnitude higher than the device without the collimator at frequencies ranging from 40 to 200 Hz. This low-cost FPI sensor is highly-sensitive, robust and easy to fabricate. It could potentially be used for vibration monitoring in remote and harsh environments.

Low-Cost Plate-Type MOEMS Uniaxial Vibration Sensor Based on Metal Etching and Fiber Collimator Technique

2016 ◽  
Vol 16 (12) ◽  
pp. 4816-4821
Author(s):  
Shanchao Jiang ◽  
Jing Wang ◽  
Qingmei Sui ◽  
Qinglin Ye
Keyword(s):  
Low Cost ◽  
Vibration Sensor ◽  
Fiber Collimator ◽  
Metal Etching ◽  
Plate Type

Experimental Research of Strain and Temperature Based on EFPI Sensor

2011 ◽  
Vol 130-134 ◽  
pp. 4185-4188
Author(s):  
Xiu Feng Yang ◽  
Chun Yu Zhang ◽  
Zheng Rong Tong
Keyword(s):  
Low Cost ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Good Reliability ◽  
High Repetition ◽  
Sensing Applications ◽  
Fabry Perot ◽  
Wet Chemical ◽  
The Many ◽  
Multi Mode

An extrinsic Fabry-Perot (F-P) interferometric (EFPI) sensor by using simple etching and fusing method is proposed and demonstrated. The cavity is formed by wet chemical etching of multi-mode fiber (MMF) end face in hydrofluoric acid solutions, and then it is fused to the end of a single-mode fiber (SMF) to form an extrinsic F-P structure. The strain and temperature of EFPI sensor are studied experimentally. The experimental results show that the interference wavelength becomes 2.648nm longer while the strain increases from 0N to 637N, and the strain sensitivity is about 0.004nm/N, and linearity is 0.999. The interference wavelength becomes 0.032nm shorter while the temperature increases from 20°C to 100°C. This kind of sensor has the many advantages of easy fabrication, good reliability, high-repetition, small size, low cost and mass-production, which offers great prospect for sensing applications.

scholarly journals Fringe Visibility Enhanced Extrinsic Fabry–Perot Interferometer Using a Graded Index Fiber Collimator

2010 ◽  
Vol 2 (3) ◽  
pp. 469-481 ◽  
Author(s):  
Yinan Zhang ◽  
Yanjun Li ◽  
Tao Wei ◽  
Xinwei Lan ◽  
Ying Huang ◽  
...  
Keyword(s):  
Fringe Visibility ◽  
Graded Index ◽  
Fabry Perot ◽  
Fiber Collimator

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 Miniature on-fiber extrinsic Fabry-Perot interferometric vibration sensors based on micro-cantilever beam

2019 ◽  
Vol 8 (1) ◽  
pp. 293-298 ◽  
Author(s):  
Weiyi Ma ◽  
Yi Jiang ◽  
Han Zhang ◽  
Liuchao Zhang ◽  
Jie Hu ◽  
...  
Keyword(s):  
Cantilever Beam ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Vibration Sensor ◽  
Fiber Axis ◽  
Vibration Sensors ◽  
Beam Design ◽  
Cantilever Length ◽  
Fabry Perot ◽  
Micro Cantilever

Abstract An on-fiber extrinsic Fabry–Perot interferometric (EFPI) vibration sensor based on micro-cantilever beam is proposed and experimentally demonstrated. The micro-cantilever beam, with a cantilever length of 80μm and a cantilever thickness of 5μm, is created perpendicular to the fiber axis by using the femtosecond laser micro-machining technique. The on-fiber vibration sensor has same diameter with that of the single mode fiber. An acceleration sensitivity of 11.1 mV/g@300 Hz in the range of 0.5-5g is demonstrated experimentally. This on-fiber and micro-cantilever beam design allows for the sensor to be smaller size and higher temperature resistance.

scholarly journals Pipeline Monitoring Using Highly Sensitive Vibration Sensor Based on Fiber Ring Cavity Laser

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2078
Author(s):  
Nageswara Lalam ◽  
Ping Lu ◽  
Abhishek Venketeswaran ◽  
Michael P. Buric
Keyword(s):  
Ring Laser ◽  
Ring Cavity ◽  
Single Mode ◽  
Vibration Sensor ◽  
Vibration Monitoring ◽  
Fiber Sensor ◽  
Fiber Ring ◽  
Lasing Wavelength ◽  
Highly Sensitive ◽  
Cavity Laser

A vibration fiber sensor based on a fiber ring cavity laser and an interferometer based single-mode-multimode-single-mode (SMS) fiber structure is proposed and experimentally demonstrated. The SMS fiber sensor is positioned within the laser cavity, where the ring laser lasing wavelength can be swept to an optimized wavelength using a simple fiber loop design. To obtain a better signal-to-noise ratio, the ring laser lasing wavelength is tuned to the maximum gain region biasing point of the SMS transmission spectrum. A wide range of vibration frequencies from 10 Hz to 400 kHz are experimentally demonstrated. In addition, the proposed highly sensitive vibration sensor system was deployed in a field-test scenario for pipeline acoustic emission monitoring. An SMS fiber sensor is mounted on an 18” diameter pipeline, and vibrations were induced at different locations using a piezoelectric transducer. The proposed method was shown to be capable of real-time pipeline vibration monitoring.

scholarly journals A Compact Strain Sensor Based on Microstructural Fabry-Perot Fiber Cavity

2021 ◽  
Author(s):  
Zhiwu Guo ◽  
Yannan Wang ◽  
Jin Li
Keyword(s):  
Low Cost ◽  
Strain Sensor ◽  
Single Mode ◽  
Expansion Method ◽  
Drawing Process ◽  
Fiber System ◽  
Air Chamber ◽  
Fabry Perot ◽  
The Common ◽  
Easy Integration

Fabry-Perot air chamber was constructed at the melting point (splicing location) of two single-mode fibers by glycerin assisted self-expansion method. The morphology of the Fabry-Perot air chamber was fabricated and optimized by modulating the splicing parameters (drawing process, discharging location, time and intensity) and the fibers’ end-face (plane or arc). The in-line or reflected Fabry-Perot cavities have been applied to determine the tensile strain in the range of 0-1.2 N. The train sensing performance of the spherical shaped FP cavity has been experimentally demonstrated with the best sensitivity of 3.628 nm/N, corresponding to the resolution of ~0.005 N. The proposed FP fiber sensor has the advantages of low cost, fast fabrication and easy-integration with the common fiber system.

scholarly journals An In-Line Fiber Optic Fabry–Perot Sensor for High-Temperature Vibration Measurement

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 252
Author(s):  
Dong Chen ◽  
Jiang Qian ◽  
Jia Liu ◽  
Baojie Chen ◽  
Guowen An ◽  
...  
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Glass Tube ◽  
Single Mode ◽  
Vibration Sensor ◽  
Vibration Measurement ◽  
Voltage Sensitivity ◽  
Hollow Silica ◽  
Fabry Perot ◽  
Radial Dimension

An in-line fiber optic Fabry–Perot (FP) sensor for high-temperature vibration measurement is proposed and experimentally demonstrated in this paper. We constructed an FP cavity and a mass on single-mode fibers (SMFs) by fusion, and together they were inserted into a hollow silica glass tube (HST) to form a vibration sensor. The radial dimension of the sensor was less than 500 μm. With its all-silica structure, the sensor has the prospect of measuring vibration in high-temperature environments. In our test, the sensor had a resonance frequency of 165 Hz. The voltage sensitivity of the sensor system was about 11.57 mV/g and the nonlinearity was about 2.06%. The sensor could work normally when the temperature was below 500 °C, and the drift of the phase offset point with temperature was 0.84 pm/°C.

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