A Diaphragm-type Highly Sensitive Fiber Bragg Grating Force Transducer with Temperature Compensation

Li, Ruiya; Tan, Yuegang; Bing, Junjun; Li, Tianliang; Hong, Liu; Yan, Junwei; Hu, Jianmin; Zhou, Zude

doi:10.1109/jsen.2017.2779853

Cited by 9 publications

(6 citation statements)

References 31 publications

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“…FBG is often used in telecommunication and sensing technologies [ 37 ] and is made from a periodic or almost periodic modulation of the refraction index within the core of a photosensitive optical fiber [ 37 , 38 ]. FBG typically works as a spectral filter, so that when broadband light is propagated along the grating, the only wavelength that meets Bragg’s resonance condition is reflected [ 30 , 37 ]. The reflected wavelength is called a Bragg wavelength ( λ B ).…”

Section: Operating Principle and Experimental Configurationmentioning

confidence: 99%

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Liquid Level Sensor with Two FBGs Embedded in a PDMS Diaphragm: Analysis of the Linearity and Sensitivity

Morais

Pontes

Marques

2022

Sensors

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This paper presents a fiber optic, liquid level sensor system based on a pair of fiber Bragg gratings (FBGs), embedded in a circular silicone (PDMS—polydimethylsiloxane) rubber diaphragm. The measurement principles of this sensor, whose diaphragm structure is about 2.2 mm thick with 45 mm in diameter, are introduced. To analyze the linearity and sensitivity of the sensor, the diaphragm was subjected to compression tests as well as to liquid level loading and unloading. The force and liquid level increase tests showed that inserting two FBGs (0.99453 for force and 0.99163 for liquid level) in the diaphragm resulted in a system with greater linearity than that with individual FBGs. This occurred where FBG1 showed 0.97684 for force and 0.98848 for liquid level and FBG2 presented 0.89461 for force and 0.93408 for liquid level. However, the compression and water level decrease tests showed that the system (R2 = 0.97142) had greater linearity with FBG2 (0.94123) and lower linearity with FBG1 (0.98271). Temperature characterization was also performed, and we found that sensitivity to FBG1 temperature variation was 11.73 pm/°C and for FGB2 it was 10.29 pm/°C. Temperature sensitivity was improved for both FBGs when compared with uncoated FBGs with typical values of 9.75 pm/°C. Therefore, the proposed FBG-based sensor system is capable of simultaneous measurement of force and temperature in a compact diaphragm-embedded system.

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Section: Operating Principle and Experimental Configurationmentioning

confidence: 99%

“…However, this method only works for a single fluid, and it must have a constant relative density [ 9 ]. In addition to liquid level monitoring, diaphragm-based sensors with built-in FBGs are employed in sensing pressure [ 25 ], vibration [ 26 ], acceleration [ 29 ], and force [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Liquid Level Sensor with Two FBGs Embedded in a PDMS Diaphragm: Analysis of the Linearity and Sensitivity

Morais

Pontes

Marques

2022

Sensors

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“…Diaphragms are one of the most commonly employed structures for FBG embedment. They are used on the assessment of vibration [28], acceleration [29], plantar pressure [30], force [31] and liquid level [32]. For such different parameters, with different requirements of sensitivity and dynamic range, the diaphragm design is of critical importance, since the dynamic response of the sensor is dependent on the diaphragm geometry [33] and material behavior [34].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Linearity and Sensitivity of 3D-Printed Diaphragms With Chirped FBGs in CYTOP Fibers

et al. 2020

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We report the development of an optimization approach for diaphragm-embedded optical fiber sensors, which was applied on the pressure, force and liquid level assessment using chirped fiber Bragg gratings (CFBGs) inscribed in cyclic transparent optical polymer (CYTOP) fibers. The inscription was performed using the plane-by-plane method with a femtosecond laser, whereas the diaphragm optimization was performed through the multi-objective particle swarm optimization (MOPSO). The objective functions for the optimization were obtained from numerical simulation using the finite element method of diaphragms with different thickness and diameters. The MOPSO resulted in a set of solutions with thickness and diameter aiming the optimization of sensitivity and linearity of diaphragm-embedded CFBG sensors. Three configurations were chosen with different values sensitivity and linearity. Experimental analysis was performed in each configuration for temperature and pressure variations, where the results confirmed the different sensitivity and linearity levels for each chosen configuration. Two applications were analyzed for the proposed configurations with higher sensitivity and linearity: one for force estimation over a 200-N range and the other for sub-millimeter assessment of liquid level over a 50-cm range. In order to obtain a highly reliable and accurate system, a novel data integration method for chirped FBGs was proposed. In this case, the estimation of force, pressure or liquid level was performed considering the contributions of both wavelength shift and full width half maximum (FWHM) variations. The proposed approach resulted in error improvement of 60% for all cases and for all parameters analyzed.

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“…It is widely used in the fields of automatic weighing, process detection and switch control in various industries (Jia et al, 2010;Tarighi et al, 2016). The working principle of the force sensor is to measure the strain of the sensitive area by using the strain gauge attached to the sensitive area of the elastomer, and then obtain the corresponding relationship between the strain input signal and the output electrical signal through accurate static and dynamic calibrations to obtain the loading information for objects (Li et al, 2018;Qu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Optimization of internal thread structure of force sensor considering fatigue performance

Sun

Wang

Zhang³

2019

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Purpose Fatigue damage of internal threads has gradually become the main failure mode of force sensor. To make the internal thread structure of force sensor meet the fatigue performance requirements, the design criteria of static strength and fatigue life are comprehensively considered in this paper. Design/methodology/approach The variation of static stress and fatigue life with the size of the main structure is obtained by simulation. By changing the number of thread turns, the hub height and outer diameter of the hub, the optimized design of the spoke force sensor is determined. Findings The experiment was carried out based on the determined optimized structure, and the results showed that the fatigue life meets the design requirements. Originality/value This research has certain guiding significance for the design and developments of high-cycle fatigue force sensors.

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A Diaphragm-type Highly Sensitive Fiber Bragg Grating Force Transducer with Temperature Compensation

Cited by 9 publications

References 31 publications

Liquid Level Sensor with Two FBGs Embedded in a PDMS Diaphragm: Analysis of the Linearity and Sensitivity

Liquid Level Sensor with Two FBGs Embedded in a PDMS Diaphragm: Analysis of the Linearity and Sensitivity

Optimizing Linearity and Sensitivity of 3D-Printed Diaphragms With Chirped FBGs in CYTOP Fibers

Optimization of internal thread structure of force sensor considering fatigue performance

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