scholarly journals High-sensitivity relative humidity fiber-optic sensor based on an internal–external Fabry–Perot cavity Vernier effect

2021 ◽  
Author(s):  
Chen Zhou ◽  
Qian Zhou ◽  
Bo Wang ◽  
Jiajun Tian ◽  
Yong Yao
Keyword(s):  
Relative Humidity ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Fabry Perot ◽  
Vernier Effect

High Sensitivity Humidity Fiber-Optic Sensor Based on All-Agar Fabry–Perot Interferometer

2018 ◽  
Vol 18 (12) ◽  
pp. 4879-4885 ◽  
Author(s):  
Bo Wang ◽  
Jiajun Tian ◽  
Ling Hu ◽  
Yong Yao
Keyword(s):  
Fiber Optic ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Fabry Perot

scholarly journals Low-Coherence Interferometric Fiber Optic Sensor for Humidity Monitoring Based on Nafion® Thin Film

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 629 ◽  
Author(s):  
Erwin Maciak
Keyword(s):  
Thin Film ◽  
Relative Humidity ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Regeneration Time ◽  
Low Coherence ◽  
Fabry Perot ◽  
Multi Mode ◽  
Resonance Cavity

The main aim of this work was the design and development simple fiber optic Fabry-Perot interferometer (FPI) sensor devices for relative humidity (RH) sensing with emphasis on high sensitivity and good stability. The RH fiber FPI sensor is fabricated by coating the end of a cleaved standard multi-mode (MM) fiber with hydrophilic Nafion® sensing film. The Nafion® thin film acts as an active resonance cavity of the low-coherence interferometric sensing structure. The fringe pattern, which is caused by interfering light beam in the Nafion® thin film will shift as the RH changes because the water molecules will swell the Nafion® film and thus change optical pathlength of the sensing structure. The operating principle of a FPI sensor based on the adsorption and desorption of water vapour in the Nafion® and the limitations of this sensor type are discussed in this work. The fiber optic hygrometer was tested in the visible (400–900 nm) region of spectra for measurement of relative humidity (RH) in the range of 5.5–80% at room temperature (RT) in air. The fiber optic humidity sensor has a very short response time (t90 = 5–80 s) and a fast regeneration time (t10 = 5–12 s) as good as commercial sensors.

scholarly journals Low-pressure and liquid level fiber‐optic sensor based on polymeric Fabry–Perot cavity

2021 ◽  
Vol 53 (5) ◽  
Author(s):  
D. Jauregui-Vazquez ◽  
M. E. Gutierrez-Rivera ◽  
D. F. Garcia-Mina ◽  
J. M. Sierra-Hernandez ◽  
E. Gallegos-Arellano ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Low Pressure ◽  
Fiber Optic Sensor ◽  
Liquid Level ◽  
Optic Sensor ◽  
Fabry Perot

Integration of miniature Fabry–Perot fiber optic sensor with FBG for the measurement of temperature and strain

2011 ◽  
Vol 284 (6) ◽  
pp. 1612-1615 ◽  
Author(s):  
L. Li ◽  
X.L. Tong ◽  
C.M. Zhou ◽  
H.Q. Wen ◽  
D.J. Lv ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Fabry Perot

Fabry-Perot diaphragm fiber-optic sensor

2007 ◽  
Vol 46 (31) ◽  
pp. 7614 ◽  
Author(s):  
Ken K. Chin ◽  
Yan Sun ◽  
Guanhua Feng ◽  
George E. Georgiou ◽  
Kangzhu Guo ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Fabry Perot

Laboratory investigation on Fabry-Perot sensor and conventional extensometers for strain measurement in high performance concrete

2000 ◽  
Vol 27 (5) ◽  
pp. 1088-1093 ◽  
Author(s):  
Marco Quirion ◽  
Gérard Ballivy
Keyword(s):  
High Performance ◽  
Fiber Optic ◽  
High Performance Concrete ◽  
Fiber Optic Sensor ◽  
Vibrating Wire ◽  
Thermal Tests ◽  
Optic Sensor ◽  
Wire Strain ◽  
Fabry Perot ◽  
Concrete Cylinders

Advances in fiber optic sensing technology have made possible the installation of an extremely precise and reliable sensor in small structural members. Because of the high sensitivity and fast response of the sensor, low strain and dynamic strain can be measured. In this study, a Fabry-Perot strain sensor was cast in a high performance concrete cylinder, which had been submitted to simple compression and thermal tests. These results were compared with measurements obtained using external linear variable differential transformers fixed on concrete samples having the same composition as the fiber optic instrumented concrete cylinder. Comparisons were also done with results from tests on concrete cylinders instrumented with embedment vibrating wire and electrical strain gauges. In addition, thermal tests were performed on the different concrete cylinders and samples in order to compare the behaviour of the different sensors in high performance concrete submitted to temperature variations. The results show that the concrete strains measured with the Fabry-Perot sensor are in agreement with strain measurements made on concrete samples. Consequently, the presence of the embedded fiber optic sensor does not influence greatly the mechanical properties of concrete. Furthermore, for high stress levels (0.4 f 'c) and rapid stress changes (0.25 MPa/s), the fiber optic sensor measures with higher accuracy the strains of high performance concrete than the vibrating wire strain gauge.Key words: high performance concrete, sensor, vibrating wire, strain, extensometer, Fabry-Perot, fiber optic, instrumentation.

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