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Updated: May 9, 2026

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High-sensitivity optical humidity sensor based on a thin dielectric waveguide.

R A S Ribeiro1, J F M Domenegueti, S C Zilio

  • 1Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil.

Applied Optics
|July 12, 2013
PubMed
Summary

A novel low-cost humidity sensor utilizes a dielectric thin film waveguide to detect moisture. This optical waveguide sensor offers high sensitivity, particularly at low relative humidity levels, with a rapid response time.

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Area of Science:

  • Photonics and Sensor Technology
  • Materials Science for Environmental Monitoring

Background:

  • Accurate humidity sensing is crucial for various environmental and industrial applications.
  • Existing humidity sensors often face limitations in cost, sensitivity, or response time.

Purpose of the Study:

  • To develop and present a low-cost, high-sensitivity humidity sensor.
  • To leverage dielectric thin film waveguide technology for humidity detection.

Main Methods:

  • Fabrication of a low-loss dielectric thin film waveguide.
  • Coupling laser light into the waveguide via optical tunneling.
  • Detection of reflected light carrying refractive index information using a CCD sensor and microcontroller analysis.

Main Results:

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  • The sensor demonstrates high sensitivity to relative humidity (RH) changes, especially below 10% RH.
  • Linear sensor response observed between 20% and 80% RH.
  • Achieved a rapid response time of a few seconds.

Conclusions:

  • The presented dielectric thin film waveguide sensor offers a promising low-cost solution for high-sensitivity humidity monitoring.
  • The optical tunneling method provides an effective means to interrogate the waveguide for environmental sensing.
  • The sensor's performance characteristics make it suitable for applications requiring precise and fast humidity measurements.