Optical Bragg grating sensor fibers for ultra-high temperature applications

Bartelt, Hartmut; Elsmann, Tino; Habisreuther, T.; Schuster, Kay; Rothhardt, Manfred

doi:10.1117/12.2185623

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…Fiber optical sensors (FOS) were introduced to the field of medicine in the 1960s for cardiac, endoscopic, and intravascular applications [ 96 ]. In recent years, FOS have demonstrated an extensive and rapid growth in many basic life sciences research and medical applications [ 97 , 98 , 99 , 100 , 101 , 102 ] as a useful sensing device for measuring strain [ 103 , 104 ], pressure [ 105 ], force [ 106 ], temperature [ 107 ] or refractive index [ 108 ]. The most common sensing techniques applied to FOS in the field of biomechanics are based on intensity [ 109 ], phase [ 110 ], and wavelength modulation [ 111 ], the latter being associated with the operation of fiber Bragg grating sensors (FBGs).…”

Section: Types Of Transducersmentioning

confidence: 99%

Techniques for Interface Stress Measurements within Prosthetic Sockets of Transtibial Amputees: A Review of the Past 50 Years of Research

Al-Fakih

Osman

Adikan

2016

Sensors

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The distribution of interface stresses between the residual limb and prosthetic socket of a transtibial amputee has been considered as a direct indicator of the socket quality fit and comfort. Therefore, researchers have been very interested in quantifying these interface stresses in order to evaluate the extent of any potential damage caused by the socket to the residual limb tissues. During the past 50 years a variety of measurement techniques have been employed in an effort to identify sites of excessive stresses which may lead to skin breakdown, compare stress distributions in various socket designs, and evaluate interface cushioning and suspension systems, among others. The outcomes of such measurement techniques have contributed to improving the design and fitting of transtibial sockets. This article aims to review the operating principles, advantages, and disadvantages of conventional and emerging techniques used for interface stress measurements inside transtibial sockets. It also reviews and discusses the evolution of different socket concepts and interface stress investigations conducted in the past five decades, providing valuable insights into the latest trends in socket designs and the crucial considerations for effective stress measurement tools that lead to a functional prosthetic socket.

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Section: Types Of Transducersmentioning

confidence: 99%

Techniques for Interface Stress Measurements within Prosthetic Sockets of Transtibial Amputees: A Review of the Past 50 Years of Research

Al-Fakih

Osman

Adikan

2016

Sensors

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“…Fiber Bragg grating (FBG) sensors offer high sensitivity, durability, multiplexibility, immunity to electromagnetic interference, and resistance to the aggressive environment [73][74][75][76][77][78][79][80], and they have been widely used for measuring different quantities (e.g., strain, temperature, humidity, force, and pressure, to name a few). Kanellos et al [81] developed a highly-sensitive pressure sensor by embedding an FBG sensor in a thin polymeric sheet to form a 20×20×2.5 mm 3 sensing pad.…”

Section: Optical Sensorsmentioning

confidence: 99%

Sensing and actuation technologies for smart socket prostheses

Gupta

Loh

Pedtke³

2019

Biomed. Eng. Lett.

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The socket is the most critical part of every lower-limb prosthetic system, since it serves as the interfacial component that connects the residual limb with the artificial system. However, many amputees abandon their socket prostheses due to the high-level of discomfort caused by the poor interaction between the socket and residual limb. In general, socket prosthesis performance is determined by three main factors, namely, residual limb-socket interfacial stress, volume fluctuation of the residual limb, and temperature. This review paper summarizes the various sensing and actuation solutions that have been proposed for improving socket performance and for realizing next-generation socket prostheses. The working principles of different sensors and how they have been tested or used for monitoring the socket interface are discussed. Furthermore, various actuation methods that have been proposed for actively modifying and improving the socket interface are also reviewed. Through the continued development and integration of these sensing and actuation technologies, the long-term vision is to realize smart socket prostheses. Such smart socket systems will not only function as a socket prosthesis but will also be able to sense parameters that cause amputee discomfort and self-adjust to optimize its fit, function, and performance.

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“…The induced local material changes in silica fiber yield an increase of the refractive index. FBGs are defined as type-I or type-II depending on whether the exposure intensity is lower or higher than the fiber material damage threshold [ 3 ]. However, the long-term instability under high temperature (up to 400 °C) has limited applications of type-I FBG in the high temperature field.…”

Section: Introductionmentioning

confidence: 99%

A IR-Femtosecond Laser Hybrid Sensor to Measure the Thermal Expansion and Thermo-Optical Coefficient of Silica-Based FBG at High Temperatures

Yang

et al. 2018

Sensors

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In this paper, a hybrid sensor was fabricated using a IR-femtosecond laser to measure the thermal expansion and thermo-optical coefficient of silica-based fiber Bragg gratings (FBGs). The hybrid sensor was composed of an inline fiber Fabry-Perot interferometer (FFPI) cavity and a type-II FBG. Experiment results showed that the type-II FBG had three high reflectivity resonances in the wavelength ranging from 1100 to 1600 nm, showing the peaks in 1.1, 1.3 and 1.5 μm, respectively. The thermal expansion and thermo-optical coefficient (1.3 μm, 1.5 μm) of silica-based FBG, under temperatures ranging from 30 to 1100 °C, had been simultaneously calculated by measuring the wavelength of the type-II FBG and FFPI cavity length.

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Optical Bragg grating sensor fibers for ultra-high temperature applications

Cited by 6 publications

References 7 publications

Techniques for Interface Stress Measurements within Prosthetic Sockets of Transtibial Amputees: A Review of the Past 50 Years of Research

Techniques for Interface Stress Measurements within Prosthetic Sockets of Transtibial Amputees: A Review of the Past 50 Years of Research

Sensing and actuation technologies for smart socket prostheses

A IR-Femtosecond Laser Hybrid Sensor to Measure the Thermal Expansion and Thermo-Optical Coefficient of Silica-Based FBG at High Temperatures

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