Quasi-Distributed Torque and Displacement Sensing on a Series Elastic Actuator’s Spring Using FBG Arrays Inscribed in CYTOP Fibers

Leal‐Junior, Arnaldo; Theodosiou, Antreas; Min, Rui; Casas, Jonathan; Díaz, Camilo A. R.; Santos, Wilian M. dos; Pontes, Maria José; Siqueira, Adriano A. G.; Marques, Carlos; Kalli, Kyriacos; Frizera, Anselmo

doi:10.1109/jsen.2019.2898722

Cited by 80 publications

(20 citation statements)

References 31 publications

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“…Similar output can be obtained using polymer optical fiber-FBG reported in Ref. 152, where multiple FBG written in CYTOP were employed in a series elastic actuator spring for displacement measurement. Assessing the movement of joint in body is crucial in medical practice and the latest study was conducted where stiffness and angular displacement of first metatarsophalangeal joint was recorded using FBG and load cell.…”

Section: Fbg-based Displacement Sensorsupporting

confidence: 67%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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Fiber Bragg grating has embraced the area of fiber optics since the early days of its discovery, and most fiber optic sensor systems today make use of fiber Bragg grating technology. Researchers have gained enormous attention in the field of fiber Bragg grating (FBG)-based sensing due to its inherent advantages, such as small size, fast response, distributed sensing, and immunity to the electromagnetic field. Fiber Bragg grating technology is popularly used in measurements of various physical parameters, such as pressure, temperature, and strain for civil engineering, industrial engineering, military, maritime, and aerospace applications. Nowadays, strong emphasis is given to structure health monitoring of various engineering and civil structures, which can be easily achieved with FBG-based sensors. Depending on the type of grating, FBG can be uniform, long, chirped, tilted or phase shifted having periodic perturbation of refractive index inside core of the optical fiber. Basic fundamentals of FBG and recent progress of fiber Bragg grating-based sensors used in various applications for temperature, pressure, liquid level, strain, and refractive index sensing have been reviewed. A major problem of temperature cross sensitivity that occurs in FBG-based sensing requires temperature compensation technique that has also been discussed in this paper.

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Section: Fbg-based Displacement Sensorsupporting

confidence: 67%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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“…A novel technique based on the stress-optic effect on the measurement of the actuator torque was proposed, which leads to the reduction of components of the actuator instrumentation that initially were two encoders and can be reduced to only one POF sensor. As an important parameter on the disturbance rejection on the actuator as well as a means of increasing the accuracy on the actuator torque measurement (which has a direct impact on its control accuracy and robustness), a quasi-distributed sensor system for measuring multipoint spring deflection was proposed in reference [158]. The system has eight FBGs inscribed in a CYTOP distributed in different points of the SEA’s spring, where it was demonstrated that the deflection measurement in those points can not only lead to the rejection of external mechanical disturbance on the actuator, but also the increase of the accuracy on the torque estimation by using sensor integration techniques such as the Kalman filter [159].…”

Section: Polymer Optical Fiber Sensors: Applications In Healthcarementioning

confidence: 99%

Polymer Optical Fiber Sensors in Healthcare Applications: A Comprehensive Review

Leal‐Junior

Díaz

Avellar

et al. 2019

Sensors

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170

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Advances in medicine and improvements in life quality has led to an increase in the life expectancy of the general population. An ageing world population have placed demands on the use of assistive technology and, in particular, towards novel healthcare devices and sensors. Besides the electromagnetic field immunity, polymer optical fiber (POF) sensors have additional advantages due to their material features such as high flexibility, lower Young’s modulus (enabling high sensitivity for mechanical parameters), higher elastic limits, and impact resistance. Such advantages are well-aligned with the instrumentation requirements of many healthcare devices and in movement analysis. Aiming at these advantages, this review paper presents the state-of-the-art developments of POF sensors for healthcare applications. A plethora of healthcare applications are discussed, which include movement analysis, physiological parameters monitoring, instrumented insoles, as well as instrumentation of healthcare robotic devices such as exoskeletons, smart walkers, actuators, prostheses, and orthosis. This review paper shows the feasibility of using POF sensors in healthcare applications and, due to the aforementioned advantages, it is possible to envisage a further widespread use of such sensors in this research field in the next few years.

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Section: Introductionmentioning

confidence: 99%

“…The Bragg wavelength depends on the refractive index and the grating period of the periodic index perturbations, which is commonly inscribed in fibre using phase mask fabrication technique [6]. The Bragg wavelength difference of one or numerous multiplexed sensors is measured and then converted into engineering units [7], as seen in quasi-distributed [8] and multiparameter assessment [9] Biomedical applications benefit from diverse FBG sensors characteristics. These sensors are resistant to water and chemicals [10], whereas electrical strain gauges (ESG) need protection against salivary assault [11].…”

Section: Introductionmentioning

confidence: 99%

Fibre Bragg grating sensors for sutural expansion assessment in rapid palatal expanders: an ex‐vivo validation

Coimbra

Campos

Oliveira

et al. 2020

IET Optoelectronics

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This study presents the development and validation of a fibre Bragg gratings (FBGs)-based sensor system for the assessment of strain in the midpalatal suture in subjects using rapid palatal expanders (RPEs). The ex-vivo experiments were made by means of positioning two RPEs in a porcine palatal region. The RPEs used were the Hyrax, a tooth-borne expander and MARPE (microimplant-assisted rapid palatal expansion), a bone-borne expander. In order to define the regions in the palatal region for the sensors positioning, a finite-element analysis was performed in a porcine head subjected to the loadings caused by an RPE. In addition, a strain transfer model was used to obtain a correction coefficient that approximates the strain estimated by the FBG to the actual strain in the structure under shear and normal stress. Results show high linearity in the sensors characterisation tests with the advantages of compactness, intrinsic safe operation and multiplexing capabilities of FBGs. In the RPE analysis, a higher strain was estimated in the anterior region, which is in accordance with the simulation and previously reported results, where MARPE showed a higher strain (with an exponential pattern) than Hyrax as the number of activations increase. Fig. 9 Comparison of the strain in the anterior region as a function of the RPE activation between the Hyrax and MARPE appliances

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Quasi-Distributed Torque and Displacement Sensing on a Series Elastic Actuator’s Spring Using FBG Arrays Inscribed in CYTOP Fibers

Cited by 80 publications

References 31 publications

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

Polymer Optical Fiber Sensors in Healthcare Applications: A Comprehensive Review

Fibre Bragg grating sensors for sutural expansion assessment in rapid palatal expanders: an ex‐vivo validation

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