Journal ArticleDOI
Ultrahigh-sensitivity temperature fiber sensor based on multimode interference
Susana Silva,Edwin G. P. Pachon,Marcos A. R. Franco,Juliano G. Hayashi,F. Xavier Malcata,Orlando Frazão,Pedro A. S. Jorge,Cristiano M. B. Cordeiro +7 more
TLDR
The proposed sensing device relies on the self-imaging effect that occurs in a pure silica multimode fiber (coreless MMF) section of a single-mode-multimode-single-mode (SMS)-based fiber structure to extend the range of liquids with a detectable RI to above 1.43.Abstract:
The proposed sensing device relies on the self-imaging effect that occurs in a pure silica multimode fiber (coreless MMF) section of a single-mode–multimode–single-mode (SMS)-based fiber structure. The influence of the coreless-MMF diameter on the external refractive index (RI) variation permitted the sensing head with the lowest MMF diameter (i.e., 55 μm) to exhibit the maximum sensitivity (2800 nm/RIU). This approach also implied an ultrahigh sensitivity of this fiber device to temperature variations in the liquid RI of 1.43: a maximum sensitivity of −1880 pm/°C was indeed attained. Therefore, the results produced were over 100-fold those of the typical value of approximately 13 pm/°C achieved in air using a similar device. Numerical analysis of an evanescent wave absorption sensor was performed, in order to extend the range of liquids with a detectable RI to above 1.43. The suggested model is an SMS fiber device where a polymer coating, with an RI as low as 1.3, is deposited over the coreless MMF; numerical results are presented pertaining to several polymer thicknesses in terms of external RI variation.read more
Citations
More filters
Journal ArticleDOI
Recent Developments in Fiber Optics Humidity Sensors.
TL;DR: The current trends of optical fiber humidity sensors are reported and the evolution of optical structures developed towards humidity sensing, as well as the novel materials used for this purpose, will be analyzed.
Journal ArticleDOI
Trends in the design of wavelength-based optical fibre biosensors (2008–2018)
TL;DR: Some optical fibre structures have been analysed in terms of several optical parameters of interest from a photonics point of view: sensitivity, quality factor, full width at half minimum, limit of detection and figure of merit, which has made it possible to classify the most advanced optical fibre sensing techniques and their suitability when developing biosensing applications.
Journal ArticleDOI
Multimode interference tapered fiber refractive index sensors
Claudecir R. Biazoli,Susana Silva,Marcos A. R. Franco,Orlando Frazão,Cristiano M. B. Cordeiro +4 more
TL;DR: The sensing device is shown to be sensitive to the external environment, and a maximum sensitivity of 2946 nm/refractive index unit in the refractive index range of 1.42-1.43 was attained.
Journal ArticleDOI
Simultaneous measurement of refractive index, strain and temperature using a tapered structure based on SMF
Na Zhang,Na Zhang,Wei Xu,Shanhong You,Cheungchuen Yu,Changyuan Yu,Bo Dong,Bo Dong,Kunpu Li,Kunpu Li +9 more
TL;DR: In this paper, a fiber-optic sensing structure based on miniaturized modal interferometer (MMI) for simultaneous refractive index (RI), strain and temperature measurement is proposed.
Journal ArticleDOI
Advances in Optical Fiber Sensors Based on Multimode Interference (MMI): A Review
Kun Wang,Xingchen Dong,Michael H. Köhler,Patrick Kienle,Qiang Bian,Martin Jakobi,Alexander W. Koch +6 more
TL;DR: In this article, a review of optical fiber sensors based on multimode interference (MMI) has been presented, with a specific focus on the probe structures, measurement methods, and sensing properties of different structures.
References
More filters
Book
Principles and Applications
TL;DR: Fuzzy Databases: Principles and Applications is comprehensive covering all of the major approaches and models of fuzzy databases that have been developed including coverage of commercial/industrial systems and applications.
Journal ArticleDOI
Optical multi-mode interference devices based on self-imaging: principles and applications
LB Soldano,E.C.M. Pennings +1 more
TL;DR: The underlying self-imaging principle in multimode waveguides is described using a guided mode propagation analysis and it is shown that multimode interference couplers offer superior performance, excellent tolerance to polarization and wavelength variations, and relaxed fabrication requirements when compared to alternatives such as directional coupling.
Journal ArticleDOI
Optical refractive index of air: dependence on pressure, temperature and composition.
TL;DR: In supplement to Edlén's recently revised formula for relative refractivity, the density dependence of refractive index is re analyzed and new formulas are presented which are more useful over a wide range of pressure, temperature, and composition than any presently available.
Journal ArticleDOI
High sensitivity SMS fiber structure based refractometer – analysis and experiment
TL;DR: It is shown that the MMFC diameter has significant influence on the refractive index (RI) sensitivity but the length does not, and a refractometer with a lower MM FC diameter has a higher sensitivity.
Related Papers (5)
Optical multi-mode interference devices based on self-imaging: principles and applications
LB Soldano,E.C.M. Pennings +1 more