A three-axis force fingertip sensor based on fiber Bragg grating

et al. 2018

Photonic Sens

Self Cite

During last decades, sensor elements based on the fiber Bragg grating (FBG) have been widely studied and developed due to the advantages of immunity to electromagnetic interference, compact size, high precision, and so on. The FBG itself is sensitive to axial strain and temperature variation directly and can indirectly measure these complex physical parameters, such as pressure, displacement, and vibration, by using some specially designed elastic structures to convert them into the axial strain of the FBG. Whether the FBG is fixed on the measured object to measure the strain directly or fixed on an elastic structure body to measure other physical quantities, these types of FBGs could be collectively called as strain sensing FBGs. The packaging of the FBG has important influence on FBG characteristics that directly affect the measurement accuracy, such as strain transfer, temperature characteristic, and spectral shape. This paper summarizes the packaging methods and corresponding temperature compensation methods of the currently reported strain sensing FBGs, focusing especially on fully pasted FBG, pre-stretched FBG with double-end fixed, and metallic packaging. Furthermore, the advantages and drawbacks of different packaging methods have been analyzed, which can provide a reference for future researches.

Section: Packaging Of Fully Pasted Fbgmentioning

confidence: 99%

Section: Packaging Of Fully Pasted Fbgmentioning

confidence: 99%

Section: Packaging Of Pre-stretched Fbg With Double-end Fixedmentioning

confidence: 99%

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Packaging and Temperature Compensation of Fiber Bragg Grating for Strain Sensing: A Survey

Kuang

et al. 2018

Photonic Sens

Self Cite

“…In recent years, as a particular class of optical fiber sensors, fiber Bragg grating (FBG) have widely attracted attention because of their inherent advantages, such as immunity to electromagnetic interference and optical power fluctuations, small profile, light weight, no zero-temperature drift and the fact that multiple FBGs can be arrayed along a single fiber [ 1 , 2 ]. During the past few decades, FBG sensors have been widely used in mechanical equipment, civil engineering, bridge scour monitoring, aircraft, and robot [ 3 , 4 , 5 , 6 , 7 , 8 ], and have successfully obtained the measurement of many physical quantities such as displacement, vibration, force and strain [ 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg Grating Displacement Sensor with High Abrasion Resistance for a Steel Spring Floating Slab Damping Track

Liu

et al. 2018

Sensors

Self Cite

This paper presents a fiber Bragg grating (FBG) displacement sensor with high abrasion resistance for displacement monitoring of a steel spring floating slab damping track. A wedge-shaped sliding block and an equal-strength beam form a conversion mechanism to transfer displacement to the deflection of the beam, and the deflection-induced strain is exerted on two FBGs. A special linear guide rail-slider and a precision rolling bearing have been adopted onto the conversion mechanism, which turned sliding friction into rolling friction and thus significantly reduced the friction during frequent alternating displacement measuring. Sensing principle and the corresponding theoretical derivation have been demonstrated. Experiment results show that the sensor has a sensitivity of 34.32 pm/mm and a high resolution of 0.0029 mm within a measurement range of 0~90 mm. Besides, the sensor has also a good measurement capability for micro-displacement within a range of 0~3 mm. The repeatability error and hysteresis error are 1.416% and 0.323%, respectively. Good creep resistance and high abrasion resistance for alternating displacement measurement have also been presented by a performance test. These excellent performances satisfy the requirements of high precision and long-term stability in structural health monitoring for machinery equipment and civil engineering, especially in the displacement monitoring of a floating slab damping track.

“…As a particular class of optical fiber sensors, a fiber Bragg grating (FBG) has been proven to be very effective because of its inherent advantages, such as immunity to electromagnetic interference and optical power fluctuations, small profile, light weight, no zero temperature drift, and the fact that multiple FBGs can be arrayed along a single fiber [3][4][5] . During the past few decades, FBG sensors have been widely used in civil engineering [6] , structural health monitoring [7] , and robotics [8][9][10] . FBG-based vibration sensors/accelerometers mainly involve using a cantilever beam and its evolution types with an attached FBG to detect alternate strain brought by vibration deformation [11][12][13] .…”

mentioning

confidence: 99%

Hybrid fiber Bragg grating sensor for vibration and temperature monitoring of a train bearing

Wang

2018

Chin. Opt. Lett.

We report a fiber Bragg grating (FBG)-based sensor for the simultaneous measurement of a train bearing's vibration and temperature. A pre-stretched optical fiber with an FBG and a mass is designed for axial vibration sensing. Another multiplexed FBG is embedded in a selected copper-based alloy with a high thermal expansion to detect temperature. Experiments show that the sensor possesses a high resonant frequency of 970 Hz, an acceleration sensitivity of 27.28 pm/g, and a high temperature sensitivity of 35.165 pm/°C. A resonant excitation test is also carried out that demonstrates the robustness and reliability of the sensor.