WATER LEVEL MEASUREMENT VIA POLYMER DIAPHRAGM AND FIBER BRAGG GRATING SENSOR

2016 ◽  
Vol 78 (3-2) ◽  
Author(s):  
Odai Falah Ameen ◽  
Marwan Hafeedh Younus ◽  
Rosly Abdul Rahman ◽  
Raja Kamarulzaman Raja Ibrahim
Keyword(s):  
Hydrostatic Pressure ◽  
Water Level ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Optical Spectrum Analyzer ◽  
Bragg Wavelength ◽  
Sensor Head ◽  
Level Measurement ◽  
Thin Polymer ◽  
Bragg Grating Sensor

In this paper, a new design of sensor head to monitor water level inside the tank based on fiber Bragg grating (FBG) was demonstrated. The sensor head consisted of an FBG placed under a very thin polymer plastic sheet layer. This sensor head acts as a sensitive diaphragm to sense water level based on hydrostatic pressure caused by the liquid weight. The hydrostatic pressure imposed on the sensor head produced strain in the embedded FBG, which caused a shift in Bragg wavelength detected by the optical spectrum analyzer. A calibration curve to relate liquid level and shift in the Bragg wavelength was constructed. A linear relationship between the shift in Bragg wavelength and the water level up to 70 cm height with a sensitivity of 2 pm/cm is achieved in this work.

COMPARISON OF WATER LEVEL MEASUREMENT PERFORMANCE FOR TWO DIFFERENT TYPES OF DIAPHRAGM USING FIBER BRAGG GRATING BASED OPTICAL SENSORS

2016 ◽  
Vol 78 (6-11) ◽  
Author(s):  
Odai Falah Ameen ◽  
Marwan Hafeedh Younus ◽  
RK Raja Ibrahim ◽  
Rosly Abdul Rahman
Keyword(s):  
Water Level ◽  
Fiber Bragg Grating ◽  
Optical Sensors ◽  
Atmospheric Pressure ◽  
Column Height ◽  
Bragg Grating ◽  
Bragg Wavelength ◽  
Level Measurement ◽  
Different Types ◽  
Different Levels

A sensor head incorporating a diaphragm was designed and fabricated for water level measurement. It operates in the range of 0-70 cm column height, equivalent to a pressure in atmospheric pressure of 0-6.86 kPa. The fiber Bragg grating (FBG) was attached on the two types of diaphragm to detect the change in the hydrostatic pressure caused by water at different levels. The diaphragms performance by comparing the sensitivity in within the mentioned range. Optical spectrum analyzer (OSA) was used to record the shift in the Bragg wavelength at different water level. The sensitivity of water level measurement using a silicone rubber diaphragm found to be 9.81 pm/cm for 70 cm in water level, while the sensitivity for polymer plastic diaphragm found to be 2 pm/cm at the same level.

TEMPERATURE AND WATER LEVEL MEASUREMENT OF LIQUID IN A TANK USING FIBER BRAGG GRATING

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
Odai Falah Ameen ◽  
Marwan Hafeedh Younus ◽  
M. S. Aziz ◽  
RK Raja Ibrahim
Keyword(s):  
Water Level ◽  
Fiber Bragg Grating ◽  
Linear Response ◽  
Liquid Level ◽  
Laser Source ◽  
Bragg Grating ◽  
Bragg Wavelength ◽  
Work Measurement ◽  
Level Measurement ◽  
Fbg Sensors

In this work, measurement of temperature and liquid level were performed simultaneously using fiber Bragg grating (FBG) sensors. A multi-channel Fibre Interrogator with built-in ASE laser source operating around 1552 to 1568 nm was employed to record a shift in Bragg wavelength due to contribution from both temperature and hydrostatic pressure of liquid weight in the tank. Results show a linear response between liquid level and temperature readings against the shift in Bragg wavelength for liquid level up to 85 cm in height and the temperature range of 27 to 77 oC. The sensitivity of the sensor head for water level measurement is 10.57 pmcm-1, while the sensitivity for temperature measurement is 11.28 pm/oC respectively.

Fiber Bragg Grating Demodulation System Based on Equi-Intensity Cantilever Beam

2010 ◽  
Vol 437 ◽  
pp. 359-363
Author(s):  
Hong Li ◽  
Wei Ping Yan ◽  
Ren Sheng Shen ◽  
Ben Yu Wang
Keyword(s):  
Fiber Bragg Grating ◽  
Cantilever Beam ◽  
Optical Spectrum ◽  
Optical Signal ◽  
Electrical Signal ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Optical Spectrum Analyzer ◽  
Bragg Wavelength ◽  
Scanning Velocity

Optical spectrum analyzer (OSA) can achieve the higher precision and sensitivity, but it is disadvantageous for translating optical signal into electrical signal. A fiber Bragg grating (FBG) matched filtering system based on equi-intensity cantilever beam was presented in this paper. Strain characteristics in different location of cantilever beam were described, and the strain sensitivity of matching grating demodulation based on equi-intensity cantilever beam was deduced mathematically. Strain characteristics of cantilever beam were verified, and the sensing effect of the system was tested. The Bragg wavelength shift range of the demodulating FBG placed on the cantilever beam reached 10 nm, and scanning velocity was 0.125 nm/s. The system could demodulate slow-altered sensing signal accurately and rapidly.

Numerical Analysis of the Hybrid Photonic Crystal Fiber and Single Mode Fiber/Fiber Bragg Grating Sensor for Simultaneous Measurement of Temperature and Strain

2019 ◽  
Vol 16 (2) ◽  
pp. 329-334 ◽  
Author(s):  
Fabio Barros de Sousa ◽  
Fiterlinge Martins de Sousa ◽  
Jorge Everaldo de Oliveira ◽  
Lelis Araujo de Oliveira ◽  
Fabricio Pinho da Luz ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Fiber Bragg Grating ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Bragg Grating ◽  
Bragg Wavelength ◽  
Crystal Fiber ◽  
Power Peak ◽  
Bragg Grating Sensor

In this paper we investigate the performance of a Fiber Bragg Grating (FBG) as a strain-optic and temperature sensor, using the Coupled Mode Theory (CMT) and the Transfer Matrix Method (TMM), through numerical simulation in an interrogation system with Single-Mode Fiber (SMF) and Photonic Crystal Fiber (PCF). Parameters such as sensitivity, bandwidth, peak power, peak wavelength and side-lobes power, were analyzed through the Bragg wavelength change depending on the simultaneous variation of strain and temperature. The FBG sensor proposed suffered thermal variation 25 °C to 200 °C and of strain of 0 μs to 1000 μs, excellent linearity was obtained for the variation of the Bragg wavelength with differences of 0.7 nm for each 50 °C and 0.245 nm for each 200.

FIBER BRAGG GRATING BASED SYSTEM FOR TEMPERATURE MEASUREMENTS

2009 ◽  
Vol 23 (10) ◽  
pp. 2349-2356 ◽  
Author(s):  
BASHIR AHMED TAHIR ◽  
JALIL ALI ◽  
ROSLY ABDUL RAHMAN
Keyword(s):  
High Temperature ◽  
Fiber Bragg Grating ◽  
Dynamic Range ◽  
Low Cost ◽  
Sensor System ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Bragg Wavelength ◽  
Heating Water ◽  
Bragg Grating Sensor

In this study, a fiber Bragg grating sensor for temperature measurement is proposed and experimentally demonstrated. In particular, we point out that the method is well-suited for monitoring temperature because they are able to withstand a high temperature environment, where standard thermocouple methods fail. The interrogation technologies of the sensor systems are all simple, low cost and effective as well. In the sensor system, fiber grating was dipped into a water beaker that was placed on a hotplate to control the temperature of water. The temperature was raised in equal increments. The sensing principle is based on tracking of Bragg wavelength shifts caused by the temperature change. So the temperature is measured based on the wavelength-shifts of the FBG induced by the heating water. The fiber grating is high temperature stable excimer-laser-induced grating and has a linear function of wavelength-temperature in the range of 0–285°C. A dynamic range of 0–285°C and a sensitivity of 0.0131 nm/°C almost equal to that of general FBG have been obtained by this sensor system. Furthermore, the correlation of theoretical analysis and experimental results show the capability and feasibility of the purposed technique.

scholarly journals Design and Analysis of Fiber Bragg Grating Sensor to Monitor Strain and Temperature for Structural Health Monitoring

2021 ◽  
Author(s):  
Ishant Dhingra ◽  
Gurpreet Kaur ◽  
R. S. Kaler
Keyword(s):  
Fiber Bragg Grating ◽  
Health Monitoring ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Civil Structures ◽  
Bragg Wavelength ◽  
Proportional Relation ◽  
Sensor Analysis ◽  
Simulation Results ◽  
Bragg Grating Sensor

Abstract In this paper, we have proposed a bragg grating based sensor to monitor health of civil structures at distinct temperatures. We have considered increased number of gratings with suitable refractive index to enhance sensitivity of fiber bragg grating sensor. Analysis of Bragg wavelength with respect to load and temperature is successfully studied. The simulation results reveal that when independently strain (50 units per simulation) and temperature (25 ℃) are increased uniformly, a linear shift in Bragg wavelength 0.064 nm and 0.347 nm is observed, respectively. Similarly, when both strain and temperature are increased (ε = 50 & T= 25 ℃) concurrently, a directly proportional relation is found in bragg wavelength (0.403 nm). The results verify the enhanced performance of as-proposed sensor, employing it could be potentially used in civil, bio-medical and military domains.

A Single Fiber Bragg Grating Sensor for the Simultaneous Measurement of Strain and Temperature

2016 ◽  
Author(s):  
Abhay K. Singh ◽  
Haiying Huang ◽  
Yupeng Zhu ◽  
Ming Han
Keyword(s):  
Fiber Bragg Grating ◽  
Temperature Change ◽  
Simultaneous Measurement ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Spectral Bandwidth ◽  
Bragg Wavelength ◽  
Central Wavelength ◽  
Thermochromic Material ◽  
Bragg Grating Sensor

In this paper, we have introduced the bandwidth of a Tilted Fiber Bragg Grating (TFBG) as a measurand and combine it with the central Bragg wavelength to address its cross-sensitivity with temperature and strain. We have developed a method for coating the TFBG with a thermochromic material and characterized the coated TFBG sensor under temperature and strain variations. We observed that the spectral bandwidth is sensitive only to the temperature change while the central Bragg wavelength is sensitive to both the strain and temperature. Therefore, we can measure the temperature from the TFBG bandwidth alone and measure the strain from the TFBG central wavelength after compensating for temperature induced wavelength change.

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