Simultaneous measurement of humidity and temperature based on a partially coated optical fiber long period grating

SENSORS AND ACTUATORS B-CHEMICAL

卷:227

Article

Urrutia, Aitor¹  Goicoechea, Javier¹  Ricchiuti, Amelia L.²  Barrera, David²  Sales, Salvador²  Arregui, Francisco J.¹ 

[1] Univ Publ Navarra, Inst Smart Cities, Elect & Elect Engn Dept, Nanostruct Opt Devices Lab, Campus Arrosadia, Pamplona 31006, Spain

[2] Univ Politecn Valencia, Opt & Quantum Commun Grp, iTEAM Res Inst, Camino Vera S-N, E-46022 Valencia, Spain

关键词: Optical fiber sensors;    Humidity;    Temperature;    Long period grating;    LbL assembly;   

DOI  :  10.1016/j.snb.2015.12.031

来源: Elsevier

【 摘 要 】

A humidity and temperature optical fiber sensor based on a long-period grating (LPG), which can provide simultaneous response to both magnitudes, is proposed and demonstrated via experiments. Previously, the LPG was fully coated with humidity sensitive nanostructured polymeric thin films by the Layer-by Layer (LbL) nano assembly technique. Hence the surrounding refractive index was changed, so provoking wavelength shifts of the attenuation bands of the transmission spectrum. This fully coated LPG was exposed to relative humidity (RH) and temperature tests, varying from 20% to 80% RH and from 25 to 85 degrees C, respectively. Then, half of the LPG coating was chemically removed and this results in the splitting of the main attenuation band into two different contributions. When this semi-coated LPG was also exposed to RH and temperature tests, the new two attenuation bands presented different behaviors for humidity and temperature. This novel dual-wavelength based sensing method enables the simultaneous measurement of RH and temperature using only one LPG. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free