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Related Experiment Video

Updated: Jan 1, 2026

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
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Sensitivity-enhanced humidity sensor based on helix structure-assisted Mach-Zehnder interference.

Yin Liu, Ai Zhou, Libo Yuan

    Optics Express
    |December 28, 2019
    PubMed
    Summary

    A novel fiber optic sensor using a twisted helix structure coated with graphene oxide accurately measures relative humidity. This sensor demonstrates high sensitivity and fast response times, ideal for environmental monitoring.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics Sensors
    • Nanomaterials

    Background:

    • Relative humidity (RH) monitoring is crucial in various fields.
    • Existing RH sensors face challenges like slow response and limited sensitivity.
    • Fiber optic sensors offer advantages in remote and harsh environment sensing.

    Purpose of the Study:

    • To propose and demonstrate a novel helix structure-assisted Mach-Zehnder interferometer (HSA-MZI) based relative humidity sensor.
    • To investigate the sensor's performance using graphene oxide (GO) coating.
    • To evaluate the sensor's sensitivity and response time for RH detection.

    Main Methods:

    • Fabrication of a sensor comprising single-mode fiber (SMF), multimode fiber (MMF), and a twisted triangular four-core fiber (TFCF).

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  • Coating the TFCF with graphene oxide (GO) via natural evaporation.
  • Utilizing the twisted structure to excite higher-order cladding modes and evanescent fields for enhanced refractive index sensitivity.
  • Measuring transmission signal changes due to GO's water molecule absorption.

    • Main Results:

    • The HSA-MZI sensor demonstrated a high RH sensitivity of -0.885 dB/%RH within the 70%-80% RH range.
    • The sensor exhibited a fast respiratory rise time of 0.42 s and a fall time of 6.54 s.
    • The twisted structure effectively enhanced sensitivity to refractive index changes.

    Conclusions:

    • The proposed GO-coated HSA-MZI sensor is a highly sensitive and responsive device for relative humidity detection.
    • The helix structure and GO coating synergistically improve sensor performance.
    • This technology holds promise for advanced environmental and physiological monitoring applications.