Relative Humidity Sensor Based on Tip of Multimode Optical Fiber Integrated with Photonic Crystal of Hydrogel Coated Polystyrene Nanoparticles

  • Pasquale Di Palma
  • Lucia Sansone
  • Chiara Taddei
  • Stefania Campopiano
  • Michele Giordano
  • Agostino IadiciccoEmail author
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 629)


A relative humidity (RH) sensing device based on photonic crystal colloids auto-assembled directly on the tip of a multi-mode optical fiber is here described. The core-shell nanospheres are obtained by Polystyrene (PS) nanoporous structures (core) incorporated into a poly(N-isopropylacrylamide) (PNIPAM) hydrogel (shell) and are subsequently deposited via a vertical dip-coating technique on a multimode optical fiber tip. The sensing capability is due to the hydrogel shell that swells depending on the relative humidity that induce wavelength shift and amplitude changes in the photonic bandgap peak. Spectral characterization and sensing analysis are performed, and the obtained results show that spectral characteristics are highly non-linear and strongly manufacturing dependent. A resolution of 1% RH is measured at 30% RH that significantly decreases at higher RH. Hereby, numerical simulations based on the finite element method (FEM) have been performed in order to investigate the sensing mechanism.


Optical fiber sensors Deflection monitoring Structural health monitoring Strain measurement 


  1. 1.
    Yamazoe N, Shimizu Y (1986) Humidity sensors: principles and applications. Sens Actuators 10:379–398CrossRefGoogle Scholar
  2. 2.
    Alwis L, Sun T, Grattan KTV (2013) Optical fibre-based sensor technology for humidity and moisture measurement: review of recent progress. Meas J Int Meas Confed 46:4052–4074CrossRefGoogle Scholar
  3. 3.
    Ascorbe J, Corres J, Arregui F, Matias I (2017) Recent developments in fiber optics humidity sensors. Sensors 17:893CrossRefGoogle Scholar
  4. 4.
    Rajan G, Noor YM, Liu B, Ambikairaja E, Webb DJ, Peng GD (2013) A fast response intrinsic humidity sensor based on an etched singlemode polymer fiber Bragg grating. Sens Actuators, A Phys 203:107–111CrossRefGoogle Scholar
  5. 5.
    Su D et al (2013) A fiber Fabry-Perot interferometer based on a PVA coating for humidity measurement. Opt Commun 311:107–110ADSCrossRefGoogle Scholar
  6. 6.
    An J, Zhao Y, Jin Y, Shen C (2013) Relative humidity sensor based on SMS fiber structure with polyvinyl alcohol coating. Opt Int J Light Electron Opt 124:6178–6181ADSCrossRefGoogle Scholar
  7. 7.
    Esposito F, Ranjan R, Campopiano S, Iadicicco A (2018) Arc-induced long period gratings from standard to polarization-maintaining and photonic crystal fibers. Sensors 18:918CrossRefGoogle Scholar
  8. 8.
    Di Palma P, Palumbo G, Della Pietra M, Canale V, Alviggi M, Iadicicco A, Campopiano S (2019) Deflection monitoring of bi-dimensional structures by fiber Bragg gratings strain sensors. IEEE Sens J 99:1–1Google Scholar
  9. 9.
    Di Palma P, Sansone L, Pannico M, Musto P, Campopiano S, Iadicicco A, Giordano M (2019) Metallic-dielectric colloidal photonic crystal on the multimode optical fiber tip: preliminary results as optical fiber SERS probe. In: Proc. SPIE 11028, optical sensors 2019, p 110282FGoogle Scholar
  10. 10.
    Li H-N, Li D-S, Song G-B (2004) Recent applications of fiber optic sensors to health monitoring in civil engineering. Eng Struct 26:1647–1657CrossRefGoogle Scholar
  11. 11.
    Di Palma P, Taddei C, Borriello A, De Luca G, Giordano M, Iadicicco A, Campopiano S, Sansone L (2017) Self-assembled colloidal photonic crystal on the fiber optic tip as a sensing probe. IEEE Photonics J 9:1–11CrossRefGoogle Scholar
  12. 12.
    Di Palma P, Taddei C, Campopiano S, Giordano M, Iadicicco A, Sansone L (2018) Miniaturized fiber optic probe based on colloid crystals of hydrogel coated nanoparticles for relative humidity measurements. In: 26th international conference on optical fiber sensors, pp 1–4Google Scholar
  13. 13.
    Di Palma P, Sansone L, Taddei C, Campopiano S, Iadicicco A, Giordano M (2019) Fiber optic probe based on self-assembled photonic crystal for relative humidity sensing. J Lightwave Technol 37:1–9Google Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Pasquale Di Palma
    • 1
  • Lucia Sansone
    • 2
  • Chiara Taddei
    • 2
  • Stefania Campopiano
    • 1
  • Michele Giordano
    • 2
  • Agostino Iadicicco
    • 1
    Email author
  1. 1.Department of EngineeringUniversity of Naples ParthenopeNaplesItaly
  2. 2.Institute for Polymers, Composites and Biomaterials, IPCB-CNRPorticiItaly

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