Results 1 to 10 of about 559,327 (258)

Adaptable Pulse Compression in ϕ-OTDR With Direct Digital Synthesis of Probe Waveforms and Rigorously Defined Nonlinear Chirping

open access: yesIEEE Photonics Journal, 2022
Recent research in Phase-Sensitive Optical Time Doman Reflectometry (ϕ-OTDR) has been focused, among others, on performing spatially resolved measurements with various methods including the use of frequency modulated probes.
Y. Muanenda   +4 more
doaj   +1 more source

Optical fibre based real-time measurements during an LDR prostate brachytherapy implant simulation: using a 3D printed anthropomorphic phantom

open access: yesScientific Reports, 2021
An optical fibre sensor based on radioluminescence, using the scintillation material terbium doped gadolinium oxysulphide (Gd2O2S:Tb) is evaluated, using a 3D printed anthropomorphic phantom for applications in low dose-rate (LDR) prostate brachytherapy.
P. Woulfe   +6 more
doaj   +1 more source

Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain

open access: yesSensors, 2022
Polymer optical fibre Bragg grating (POFBG) sensors are of high interest due to their enhanced fracture toughness, flexibility in bending, and sensitivity in stress and pressure monitoring applications compared to silica-based sensors.
Andreas Pospori   +2 more
doaj   +1 more source

Analysis and experiment on simultaneous measurement of strain and temperature by etched and un-etched FBG pair

open access: yesResults in Optics, 2021
This paper presents analysis and experiment on simultaneous measurement of strain and temperature using pair of etched and un-etched fiber Bragg grating (FBG) fabricated in a single mode glass optical fiber.
Jitendra Kumar   +6 more
doaj   +1 more source

Recent Progress in Optical Sensors for Biomedical Diagnostics [PDF]

open access: yes, 2020
In recent years, several types of optical sensors have been probed for their aptitude in healthcare biosensing, making their applications in biomedical diagnostics a rapidly evolving subject.
Altintas, Zeynep, Pirzada, Muqsit
core   +1 more source

Dosimetric Application of Phosphorus Doped Fibre for X-ray and Proton Therapy

open access: yesSensors, 2021
Phosphorous-doped silica optical fibres with a core diameter of 4 µm were tested in X-ray and proton fields for application in cancer therapy dosimetry.
Olugbenga J. Olusoji   +7 more
doaj   +1 more source

A High-Strength Strain Sensor Based on a Reshaped Micro-Air-Cavity

open access: yesSensors, 2020
We demonstrate a high-strength strain sensor based on a micro-air-cavity reshaped through repeating arc discharge. The strain sensor has a micro-scale cavity, approximate plane reflection, and large wall thickness, contributing to a broad free spectrum ...
Yanping Chen   +7 more
doaj   +1 more source

Optical waveguide sensors [PDF]

open access: yes, 1986
An overview of the field of optical waveguide sensors is presented. Some emphasis is laid on the development of a single scheme under which the diversity of sensor principles can be arranged.
Fluitman, J., Popma, Th.
core   +2 more sources

Optical Fibre Pressure Sensors in Medical Applications

open access: yesSensors, 2015
This article is focused on reviewing the current state-of-the-art of optical fibre pressure sensors for medical applications. Optical fibres have inherent advantages due to their small size, immunity to electromagnetic interferences and their suitability
Sven Poeggel   +5 more
doaj   +1 more source

Nonlinear Hydraulic Pressure Response of an Improved Fiber Tip Interferometric High-Pressure Sensor

open access: yesSensors, 2020
We demonstrate a silica diaphragm-based fiber tip Fabry–Perot interferometer (FPI) for high-pressure (40 MPa) sensing. By using a fiber tip polishing technique, the thickness of the silica diaphragm could be precisely controlled and the pressure ...
Wei Huang   +7 more
doaj   +1 more source

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