Temperature Compensated FBG Displacement Sensor for Long-Range Applications

Thomas, Jineesh; Rajanna, T.; Asokan, S.

doi:10.1109/lsens.2019.2959377

“…An FBG displacement sensor for back reflection power monitoring only requires low-cost photodetectors (PDs) to monitor displacement [4]. Li et al modified an ultra-wide range FBG displacement sensor based on eccentric gears and successfully monitored the lateral displacement of a shear wall layer [5].Researcher converted the displacement of the measurement line into the elastic deflection of the sensing arm, achieving a displacement sensitivity of 23.80 pm/mm within the measurement range of 0-150 mm [6].The above research can only measure positive displacement. Guo et al achieved positive displacement detection and negative displacement detection through clever design using two pairs of FBG cantilever wedge slider structures.…”

Section: Introductionmentioning

confidence: 99%

Full-Range Displacement Sensor with Dual FBGs Combined Cantilever Beam Based on Magnetic Grating

Lu,

jianxin,

chen

et al. 2024

Preprint

0

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We propose a full-range displacement sensor system based on double fiber Bragg gratings (FBGs) with a cantilever beam. This sensor adopts a magnetic scale as a new transmission mechanism. By combining a simple and low-cost cantilever beam structure makes the sensing probe very easy to realize. The optimal magnetic gap was explored through multiple sets of numerical simulations. The experiment proved the sine relationship between the center wavelength shifts of FBGs and the linear displacement, proving the feasibility of this method. Results indicate that the amplitude of the tensile compression load of FBGs are 169.76 με and 296.12 με. The fitting linearity based on sinusoidal function at an air gap of 3.5 mm is 0.9663 and 0.9566. The direction of motion can be determined by the phase difference between two FBGs. Moreover, the difference of double FBGs can realize the effect of temperature compensation. Thus, this sensor can achieve non-contact, temperature-independent, and full-range measurements. It can also be exploited to measure other parameters such as angular velocity, acceleration, and magnetic field strength.

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“…An FBG displacement sensor for back reflection power monitoring only requires low-cost photodetectors (PDs) to monitor displacement [4]. Li et al modified an ultra-wide range FBG displacement sensor based on eccentric gears and successfully monitored the lateral displacement of a shear wall layer [5].Researcher converted the displacement of the measurement line into the elastic deflection of the sensing arm, achieving a displacement sensitivity of 23.80 pm/mm within the measurement range of 0-150 mm [6].The above research can only measure positive displacement. Guo et al achieved positive displacement detection and negative displacement detection through clever design using two pairs of FBG cantilever wedge slider structures.…”

Section: Introductionmentioning

confidence: 99%

Full-Range Displacement Sensor with Dual FBGs Combined Cantilever Beam Based on Magnetic Grating

Lu,

jianxin,

chen

et al. 2024

Preprint

0

View full text Add to dashboard Cite

We propose a full-range displacement sensor system based on double fiber Bragg gratings (FBGs) with a cantilever beam. This sensor adopts a magnetic scale as a new transmission mechanism. By combining a simple and low-cost cantilever beam structure makes the sensing probe very easy to realize. The optimal magnetic gap was explored through multiple sets of numerical simulations. The experiment proved the sine relationship between the center wavelength shifts of FBGs and the linear displacement, proving the feasibility of this method. Results indicate that the amplitude of the tensile compression load of FBGs are 169.76 με and 296.12 με. The fitting linearity based on sinusoidal function at an air gap of 3.5 mm is 0.9663 and 0.9566. The direction of motion can be determined by the phase difference between two FBGs. Moreover, the difference of double FBGs can realize the effect of temperature compensation. Thus, this sensor can achieve non-contact, temperature-independent, and full-range measurements. It can also be exploited to measure other parameters such as angular velocity, acceleration, and magnetic field strength.

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“…At present, tactile sensors are mainly used for force perception, but less for object surface depth detection (Shin et al , 2020). Thomas et al (2020) have developed an fiber Bragg grating (FBG) displacement sensor with a sensitivity of 23.80 pm/mm in the measurement range of 0–150 mm, while nonuniform strain distribution along the epoxied FBG element leads to issues such as chirping and low repeatability. The GelSight sensor converts the surface texture of flexible materials into images through a scanner and uses stereovision algorithms to reconstruct 3D microscopic geometric images of the contact object (Abad and Ranasinghe, 2020).…”

Section: Introductionmentioning

confidence: 99%

Design of magnetostrictive tactile sensor for depth detection

Weng

¹

,

Li

²

,

Luo

³

et al. 2023

SR

5

0

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Purpose This paper aims to design a magnetostrictive tactile sensor for surface depth detection. Unlike the human finger, although most tactile sensors have high sensitivity to pressure, they cannot detect millimeter-level depth information on the surface of objects precisely. To enhance the ability to detect surface depth information, a piezomagnetic sensor combining inverse magnetostrictive effect and bionic structure is developed in this paper. Design/methodology/approach A magnetostrictive tactile sensor based on Galfenol [(Fe83Ga17)99.4B0.6] is designed and studied for surface depth measurement. The optimal structure of the sensor is determined by experiment and theory. The test platforms for static and dynamic characteristics are set up. The static and the dynamic sensing performance of the sensor are studied experimentally. Findings The sensor can detect 0–2 mm depth change with a sensitivity of 91.5 mV/mm. A resolution of 50 µm can be achieved in the depth direction. In 50 cycles of loading and unloading tests, the maximum error of the sensor output voltage amplitude is only 2.23%. Originality/value The sensor can measure the depth information of object surface precisely with good repeatability through sliding motion and provide reference for object surface topography detection.

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Temperature Compensated FBG Displacement Sensor for Long-Range Applications

Cited by 18 publications

References 14 publications

Full-Range Displacement Sensor with Dual FBGs Combined Cantilever Beam Based on Magnetic Grating

Full-Range Displacement Sensor with Dual FBGs Combined Cantilever Beam Based on Magnetic Grating

Full-Range Displacement Sensor with Dual FBGs Combined Cantilever Beam Based on Magnetic Grating

Design of magnetostrictive tactile sensor for depth detection

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