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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 14 — Jul. 15, 2014
  • pp: 4128–4131

Nanoscale TiO2-coated LPGs as radiation-tolerant humidity sensors for high-energy physics applications

Marco Consales, Gaia Berruti, Anna Borriello, Michele Giordano, Salvatore Buontempo, Giovanni Breglio, Alajos Makovec, Paolo Petagna, and Andrea Cusano  »View Author Affiliations

Optics Letters, Vol. 39, Issue 14, pp. 4128-4131 (2014)

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This Letter deals with a feasibility analysis for the development of radiation-tolerant fiber-optic humidity sensors based on long-period grating (LPG) technology to be applied in high-energy physics (HEP) experiments currently running at the European Organization for Nuclear Research (CERN). In particular, here we propose a high-sensitivity LPG sensor coated with a finely tuned titanium dioxide (TiO2) thin layer (100nm thick) through the solgel deposition method. Relative humidity (RH) monitoring in the range 0%–75% and at four different temperatures (in the range 10°C25°C) was carried out to assess sensor performance in real operative conditions required in typical experiments running at CERN. Experimental results demonstrate the very high RH sensitivities of the proposed device (up to 1.4 nm/% RH in correspondence to very low humidity levels), which turned out to be from one to three orders of magnitude higher than those exhibited by fiber Bragg grating sensors coated with micrometer-thin polyimide overlays. The radiation tolerance capability of the TiO2-coated LPG sensor is also investigated by comparing the sensing performance before and after its exposure to a 1 Mrad dose of γ-ionizing radiation. Overall, the results collected demonstrate the strong potential of the proposed technology with regard to its future exploitation in HEP applications as a robust and valid alternative to the commercial (polymer-based) hygrometers currently used.

© 2014 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: March 19, 2014
Revised Manuscript: May 27, 2014
Manuscript Accepted: May 28, 2014
Published: July 7, 2014

Marco Consales, Gaia Berruti, Anna Borriello, Michele Giordano, Salvatore Buontempo, Giovanni Breglio, Alajos Makovec, Paolo Petagna, and Andrea Cusano, "Nanoscale TiO2-coated LPGs as radiation-tolerant humidity sensors for high-energy physics applications," Opt. Lett. 39, 4128-4131 (2014)

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