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optical-fiber-humidity-sensors
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Resonant light scattering toward optical fiber humidity sensors
, Article Photonic Sensors ; Volume 9, Issue 1 , 2019 , Pages 60-68 ; 16749251 (ISSN) ; Bahrampour, A ; Bahrampour, A. R ; Sharif University of Technology
Springer Verlag
2019
Abstract
The deposition of tetrakis (4-sulonatophenyl) porphyrin (TPPS) thin film on optical fibers presents many possibilities for sensing applications. The J-form aggregation with a narrow and sharp spectral feature at about 490 nm and its sensitivity to humidity have been discussed; a fast change of wavelength occurs according with variation in the humidity level. The reproducibility and high sensitivity of TPPS-coated fibers, along with the capabilities of optical fibers, suggest the device as a good candidate for humidity sensing in harsh environments. © 2018, The Author(s)
A proposal for distributed humidity sensor based on the induced LPFG in a periodic polymer coated fiber structure
, Article Optics and Laser Technology ; Volume 117 , 2019 , Pages 126-133 ; 00303992 (ISSN) ; Esmailzadeh Noghani, F ; Bahrampour, A ; Bahrampour, A. R ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
In this paper, a distributed relative humidity (RH) or moisture sensor is proposed. The proposed structure is a single mode telecommunication optical fiber coated by humidity sensitive and insensitive polymers periodically. The polymer coated fiber is surrounded by a high Young's modulus material such as stainless steel mesh. The swelling of the coated Humidity Sensitive Polymers (HSPs) as a result of moisture absorption induces fiber gratings in the single mode fiber. Depending on the coating period relative to the light wavelength, the induced fiber grating can be Fiber Bragg Grating (FBG) or Long Period Fiber Grating (LPFG). The light reflected by the induced FBG or losses due to the...