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Updated: Jun 27, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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A High-Sensitivity Relative Humidity and Temperature Fiber Optic Sensor Based on a Chitosan-Coated Mach-Zehnder

Jiangyu Qu1, Yu Guo1, Haidong Shao1

  • 1College of Science, Northeast Forestry University, Harbin 150001, China.

Micromachines
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

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We developed a novel bamboo-shaped fiber optic sensor using chitosan for precise relative humidity (RH) and temperature monitoring. This compact device offers high sensitivity for dual-parameter sensing in various industries.

Area of Science:

  • Fiber Optic Sensors
  • Nanomaterials
  • Environmental Monitoring

Background:

  • Mach-Zehnder interferometers (MZIs) are sensitive optical devices.
  • Chitosan's hygroscopic properties make it suitable for humidity sensing.
  • Accurate simultaneous measurement of humidity and temperature is crucial for many applications.

Purpose of the Study:

  • To propose a novel bamboo-shaped Mach-Zehnder interferometer (MBI) sensor.
  • To functionalize the MBI with chitosan for enhanced humidity sensing.
  • To demonstrate dual-parameter sensing of relative humidity (RH) and temperature.

Main Methods:

  • Fabrication of a bamboo-shaped MZI by fusing no-core and multimode fibers.
  • Tapering the fiber structure using a hydrogen-oxygen flame.
Keywords:
Mach-Zehnder interferometerchitosan coatingrelative humiditytemperature measurement

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  • Coating the fiber surface with chitosan for humidity sensitivity.
  • Experimental characterization of the sensor's response to RH and temperature variations.

    • Main Results:

    • The proposed sensor exhibited a compact structure and high sensitivity.
    • Maximum sensitivities of -0.9261 nm/%RH for RH and 0.0952 nm/°C for temperature were achieved.
    • The chitosan coating significantly enhanced the sensor's spectral response to RH due to changes in its refractive index.

    Conclusions:

    • The bamboo-shaped chitosan-coated MZI sensor is effective for simultaneous RH and temperature measurement.
    • The sensor's high sensitivity and compact design are advantageous.
    • Potential applications include biomedical, agricultural, and electronic manufacturing fields.