Recent Technological Progress of Fiber-Optical Sensors for Bio-Mechatronics Applications

Abdhul Rahuman, Mohomad Aqeel; Kahatapitiya, Nipun Shantha; Amarakoon, Viraj Niroshan; Wijenayake, Udaya; Silva, Bhagya Nathali; Jeon, Mansik; Kim, Jeehyun; Ravichandran, Naresh Kumar; Wijesinghe, Ruchire Eranga

doi:10.3390/technologies11060157

Cited by 10 publications

(5 citation statements)

References 102 publications

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“…Generally, the pulse width of Q-switched pulses are in the order of nanoseconds or microseconds with a high pulse energy. In practical applications, the microsecond pulse width of a Q-switched fiber laser is more attractive for fields such as soft- and hard-tissue ablation and photoacoustic imaging, which need lasers with a long action time and high energy [ 49 ]. In addition, the heat conduction and damage of tissue are affected by pulse width in laser medicine surgery, where the pulse width should be selected according to tissue properties to obtain better surgical results [ 50 ].…”

Section: Resultsmentioning

confidence: 99%

“…Regarding applications, owing to their eye-safe and water absorption waveband characteristics, 2

m Q-switched fiber lasers have great potential in the fields of medical sensors and laser medicine [ 63 ]. Moreover, in laser medicine, the optical fiber sensor should be integrated throughout the entire process to monitor real-time changes in various parameters during the medical process, thereby guiding the surgical operation [ 49 ]. The 2

m Q-switched fiber lasers are reliable light source for fiber sensors in non-destructive testing and non-destructive evaluation, which have the advantages of high precision, high efficiency, non-destructiveness, and comprehensiveness [ 64 , 65 ].…”

Section: Resultsmentioning

confidence: 99%

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Ag/MXene as Saturable Absorber for Tm:Ho Co-Doped Q-Switched Fiber Laser

Zhao,

Sun,

Wang

et al. 2024

Nanomaterials

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Q-switched fiber lasers have become reliable light sources for generating high-energy pulses, which can be passively modulated by saturable absorbers with excellent nonlinear optical properties. The composite combining Ag and MXene exhibits a broadband nonlinear response and high modulation depth, making it a promising candidate for saturable absorbers in pulsed lasers. Herein, we demonstrate a Q-switched Tm:Ho co-doped fiber laser centered at 2 µm, where the Ag/MXene composite serves as a saturable absorber to generate pulses. The typical spectrum, pulse train, and radio frequency spectrum of Q-switched pulses were observed, in which the 60 dB signal-to-noise ratio was higher than that of 2 µm Q-switched fiber lasers based on other materials, demonstrating the stability of the output pulses. Additionally, the long-term stability of the laser was evaluated over 2 h, where the well-maintained central wavelength and output power also indicated the robustness of the Q-switched laser. Furthermore, the influence of the pump power on the parameters of Q-switched pulses was also investigated, which is conducive to control the output characteristics of lasers. Specifically, the pulse width of the Q-switched pulse decreased, while the repetition rate, output power, and single pulse energy all increased with the increase in pump power. These experimental results demonstrate the ability of Ag/MXene as a saturable absorber and show its potential for generating high-performance pulses in ultrafast lasers.

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Section: Resultsmentioning

confidence: 99%

“…Regarding applications, owing to their eye-safe and water absorption waveband characteristics, 2

Section: Resultsmentioning

confidence: 99%

Ag/MXene as Saturable Absorber for Tm:Ho Co-Doped Q-Switched Fiber Laser

Zhao,

Sun,

Wang

et al. 2024

Nanomaterials

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“…These references underscore the importance of fiberoptic sensors, particularly FBG technology and polymer optical fibers (POFs) [56]. These technologies bring forward sensitivity, resistance to electromagnetic interference, and cost-effectiveness as crucial factors in optimal sensor selection [57].…”

Section: Fiber-optic Sensorsmentioning

confidence: 99%

A Review on the Latest Advancements and Innovation Trends in Vibration-Based Structural Health Monitoring (SHM) Techniques for Improved Maintenance of Steel Slit Damper (SSD)

Payawal,

Kim

2024

IEEE Access

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Steel slit damper (SSD) is specifically engineered to absorb and disperse energy to mitigate the possibility of structural damage and collapse during seismic events. However, the effectiveness of these dampers are compromised due to wear, corrosion and other forms of material degradation and failure mechanisms. For this reason, it is important to consistently monitor its condition and conduct maintenance and repairs to guarantee safety and dependability of the structures it is installed with. Now, vibration-based techniques have emerged as a promising structural health monitoring (SHM) strategy. It involves methodologies for detecting changes in functions and analyzing vibrations to discover potential problems. This study entails a comprehensive examination of the most recent advancements and breakthroughs in vibration-based methodologies used in SHM. Using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA 2020), we identified several key techniques and technologies that show promise in enhancing the maintenance and monitoring of steel -or steel and metal surfaces-slit dampers. The pros and cons of these methods are presented to be applicable when monitoring an SSD. This paper presents notable figures and their corresponding discussions to achieve enhanced understanding of the advancements in SHM towards sensor technologies, monitoring techniques, and applications in civil infrastructure. Furthermore, this paper reviews the applications and functions framework for real-time SHM of SSDs together with their practical implementations and applications using diverse monitoring technologies to promote innovation. Finally, the optimal sensor selection criteria, data gathering methodologies, experimental settings, innovative approaches with comparative analyses, and a proposed maintenance standard for SSDs are described in this study. INDEX TERMSSteel slit damper, structural health monitoring, vibration-based techniques, PRISMA 2020.

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“…OCT was first demonstrated in 1991 for retinal imaging [1]. OCT is an interferometric imaging technique that uses near-infrared (NIR) light to map sub-surface reflections to generate cross-sectional images with detailed morphological features [5][6][7] with intensity variations with respect to the varying refractive index of microstructures within the sample. The advent of Fourier domain OCT (FD-OCT) and its high sensitivity facilitated the progression from real-time two-dimensional (2D) imaging to real-time volumetric imaging [8,9], with the maximum imaging depth and field of view varying based on the system specifications [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Growing Trend to Adopt Speckle Variance Optical Coherence Tomography for Biological Tissue Assessments in Pre-Clinical Applications

Wijesinghe,

Kahatapitiya,

Lee

et al. 2024

Micromachines

Self Cite

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Speckle patterns are a generic feature in coherent imaging techniques like optical coherence tomography (OCT). Although speckles are granular like noise texture, which degrades the image, they carry information that can be benefited by processing and thereby furnishing crucial information of sample structures, which can serve to provide significant important structural details of samples in in vivo longitudinal pre-clinical monitoring and assessments. Since the motions of tissue molecules are indicated through speckle patterns, speckle variance OCT (SV-OCT) can be well-utilized for quantitative assessments of speckle variance (SV) in biological tissues. SV-OCT has been acknowledged as a promising method for mapping microvasculature in transverse-directional blood vessels with high resolution in micrometers in both the transverse and depth directions. The fundamental scope of this article reviews the state-of-the-art and clinical benefits of SV-OCT to assess biological tissues for pre-clinical applications. In particular, focus on precise quantifications of in vivo vascular response, therapy assessments, and real-time temporal vascular effects of SV-OCT are primarily emphasized. Finally, SV-OCT-incorporating pre-clinical techniques with high potential are presented for future biomedical applications.

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Recent Technological Progress of Fiber-Optical Sensors for Bio-Mechatronics Applications

Cited by 10 publications

References 102 publications

Ag/MXene as Saturable Absorber for Tm:Ho Co-Doped Q-Switched Fiber Laser

Ag/MXene as Saturable Absorber for Tm:Ho Co-Doped Q-Switched Fiber Laser

A Review on the Latest Advancements and Innovation Trends in Vibration-Based Structural Health Monitoring (SHM) Techniques for Improved Maintenance of Steel Slit Damper (SSD)

Growing Trend to Adopt Speckle Variance Optical Coherence Tomography for Biological Tissue Assessments in Pre-Clinical Applications

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