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Ultrasensitive Gas Refractometer Using Capillary-Based Mach-Zehnder Interferometer.

Haijin Chen1, Xuehao Hu1,2, Meifan He1

  • 1Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou 515063, Guangdong, China.

Sensors (Basel, Switzerland)
|February 27, 2020
PubMed
Summary
This summary is machine-generated.

This study presents a simple capillary-based Mach-Zehnder interferometer for highly accurate gas refractive index sensing. The device achieves ultra-high resolution, offering a cost-effective alternative to complex fiber-optic sensors.

Keywords:
air pressure sensorcapillary sensorfiber-optic sensorgas refractometergaseous refractive index sensing

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Area of Science:

  • Optics and Photonics
  • Sensor Technology
  • Materials Science

Background:

  • Interferometric sensors are crucial for precise measurements.
  • Existing fiber-optic sensors often involve complex fabrication and high costs.
  • There is a need for simple, cost-effective, and highly sensitive refractive index sensors.

Purpose of the Study:

  • To develop and demonstrate a capillary-based Mach-Zehnder interferometer for precise detection of gaseous refractive index variations.
  • To showcase the potential of simple capillary fibers for ultra-sensitive sensing applications.
  • To evaluate the sensor's resolution and temperature cross-sensitivity.

Main Methods:

  • Simultaneous excitation of capillary cladding and core modes using laser beams.
  • Generation of an interferogram through the interference of core and cladding modes.
  • Interrogation of fringe shifts caused by refractive index changes using a photodiode and slit.

Main Results:

  • Achieved a sensor resolution of approximately 5.7 × 10-8 refractive index units (RIU).
  • Demonstrated that refractive index variations directly correlate with fringe shifts.
  • Analyzed the temperature cross-sensitivity of the developed sensor.

Conclusions:

  • A simple capillary fiber can be effectively used for ultra-sensitive gas refractive index sensing.
  • The developed Mach-Zehnder interferometer offers high resolution comparable to complex devices.
  • The sensor is advantageous due to its simple structure, ease of fabrication, and low cost.