Metrological Performances of Smart Structures Based on Bragg Grating Sensors

2011 ◽  
Vol 495 ◽  
pp. 41-44
Author(s):  
Enrico De Cais ◽  
Marco Borotto ◽  
Marco Belloli ◽  
Andrea Bernasconi ◽  
Stefano Manzoni
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Bragg Grating ◽  
Strain Gages ◽  
Light Spectrum ◽  
Bending Tests ◽  
Measurement Systems ◽  
Optic Sensor ◽  
Fbg Sensors

The fiber optic Bragg grating (FBG) sensors have been recently introduced: they presenta photo-record grating on the fiber itself, which allows the reflection of a certain wavelength of theinput light spectrum. The applied strain is estimated based on changes of the reflected wavelength.The metrological characteristics of FBGs have been tested and compared to strain gages ones, whichrepresent the actual reference measurement systems. It was decided to integrate the measurementsystem directly into a composite material, having achieved good results during the static and dynamictests [1]. We made carbon fiber specimens (two for traction and two for bending tests) with FBGsintegrated into them. The results were surprising: the integration of ``nude'' fiber optic sensor didnot cause damage or deterioration in the quality of measurement, the signal noise was maintained atbaseline levels and response to dynamic stress was definitely comparable to that offered by electricalstrain gauges

Metrological Performances of Fiber Bragg Grating Sensors and Comparison with Electrical Strain Gauges

2011 ◽  
Vol 495 ◽  
pp. 53-57
Author(s):  
Marco Borotto ◽  
Enrico De Cais ◽  
Marco Belloli ◽  
Andrea Bernasconi ◽  
Stefano Manzoni
Keyword(s):  
Fiber Bragg Grating ◽  
Thermal Effects ◽  
Measurement Accuracy ◽  
Signal To Noise Ratio ◽  
Bragg Grating ◽  
Light Spectrum ◽  
Static Tests ◽  
Measurement Systems ◽  
Fiber Bragg Grating Sensors ◽  
Fbg Sensors

The fiber Bragg grating sensors (FBGs) have been recently introduced: they present a photorecord grating on the fiber itself, which allows the reflection of a certain wavelength of the input light spectrum. The applied strain is estimated relying on changes of the reflected wavelength. One of the possible applications that has prompted us to study this type of sensors is the possibility to create smart dynamometric structures based on carbon fiber by embedding FBGs. Many papers are available in literature about some applications with smart structures but there is not yet an appropriate metrological characterization about these FBG sensors, their strengths and weaknesses: for these reasons it was deemed useful making several tests on FBG sensors in terms of measurement accuracy, signal to noise ratio, ability to compensate for thermal effects and their behavior for dynamic applications. All these results have been compared to electrical strain gauge ones, which represent the actual reference strain measurement systems. The various solutions to compensate for thermal effects have offered several information for further analyses and the basis for a future use of these sensors for static or semi-static tests. Being fully aware of FBGs characteristics allows to draw down guidelines about their integration in composite materials for the most different applications, understanding in a better way the sensor response.

Research on Fiber-Optic Strain Signal Processing Based on Demodulation Technique

2010 ◽  
Vol 44-47 ◽  
pp. 2569-2572 ◽  
Author(s):  
Xiao Wei Du ◽  
Li Rong Li
Keyword(s):  
Signal Processing ◽  
Fiber Optic ◽  
Sampling Rate ◽  
Fiber Optic Sensor ◽  
Sensor Signal ◽  
Optic Sensor ◽  
Processing Module ◽  
Sensor Probe ◽  
Signal Processing Module

A higher performance signal processing module is demanded because of the high sensitivity of fiber-optic sensor probe. Excellent signal processing module is expected have the function of restore the sensor signal and very little to the introduction of noise. In this paper, improved demodulation algorithm is proposed based on the general demodulation algorithm through changing certain parameters of the algorithm aimed to improve the quality of the signal after demodulation. The output signals of scene sensor probe is sampling, sampling data through filtering. By using the improved fiber optic sensor signal demodulation algorithm, the system can fully improve the quality of the signal after demodulation under the premise of maintains the minimum sampling rate.

The Deformation Detection Method for the Buried Pipeline Based on Distributed Fiber Optic Sensor

2013 ◽  
Vol 330 ◽  
pp. 444-449 ◽  
Author(s):  
Ke Qin Ding ◽  
Li Qi Yi ◽  
Cai Fu Qian
Keyword(s):  
Fiber Optic ◽  
Detection Method ◽  
Fiber Optic Sensor ◽  
Buried Pipeline ◽  
Long Distance ◽  
Optic Sensor ◽  
Distributed Fiber Optic Sensor ◽  
Measured Strain ◽  
Fbg Sensors ◽  
Pipeline Safety

The deformation of the long-distance pipeline often happen due to the Soil collapse, gulch and the settlement of the foundation etc. The large deformation is easy to cause the fracture of the long-distance pipeline. Hence, the deformation detection is of very important to the pipeline safety. In this paper, a method for deformation calculation of the long-distance pipeline is presented based on the relation expression brtween the deformation and the strain of the long-distance pipelien. Through the measured strain, the deformation is easy to be calculated. The strains can be obtained through the FBG sensors or distributed fiber optic sensors. The deformation detection method proposed in the papaer provides the basis of the long-distance pipeline risk management.

scholarly journals Graphene Enhanced Leaky Mode Resonance in Tilted Fiber Bragg Grating: A New Opportunity for Highly Sensitive Fiber Optic Sensor

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 26641-26651 ◽  
Author(s):  
Zhihong Li ◽  
Zhuying Yu ◽  
Yubing Shen ◽  
Xiukai Ruan ◽  
Yuxing Dai
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Leaky Mode ◽  
Bragg Grating ◽  
Optic Sensor ◽  
Highly Sensitive

High-Resolution Fiber Optic Sensor based on Coated Linearly Chirped Bragg Grating

Optik ◽  
2020 ◽  
Vol 212 ◽  
pp. 164698
Author(s):  
Mandeep Singh ◽  
Sanjeev Kumar Raghuwanshi ◽  
Om Prakash ◽  
Pankaj Kumar Saini
Keyword(s):  
High Resolution ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Bragg Grating ◽  
Optic Sensor
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