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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Fabry-Perot diaphragm fiber-optic sensor.

Ken K Chin1, Yan Sun, Guanhua Feng

  • 1Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102, USA. chin@njit.edu

Applied Optics
|November 2, 2007
PubMed
Summary

A new diaphragm fiber-optic sensor (DFOS) design utilizes Fabry-Perot interference for improved performance. This novel sensor functions as both an audible microphone and ultrasonic hydrophone with enhanced signal-to-noise ratio.

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Area of Science:

  • Optoelectronics
  • Sensor Technology
  • Acoustics

Background:

  • Diaphragm fiber-optic sensors (DFOS) are crucial for various sensing applications.
  • Distinguishing between Fabry-Perot interference and intensity modulation is key for DFOS design.
  • Existing DFOS technologies may have limitations in signal-to-noise ratio.

Purpose of the Study:

  • To propose the general theory of a diaphragm fiber-optic sensor (DFOS).
  • To introduce a critical test for differentiating DFOS operational principles.
  • To present the first purely Fabry-Perot DFOS design for enhanced acoustic and ultrasonic sensing.

Main Methods:

  • Development of the general theory for diaphragm fiber-optic sensors.
  • Implementation of a critical test to identify the sensing mechanism (Fabry-Perot vs. intensity modulation).

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  • Fabrication of the sensor using microelectromechanical system (MEMS) technology.

    • Main Results:

    • Successful design and fabrication of a purely Fabry-Perot DFOS.
    • Characterization of the DFOS as an effective audible microphone.
    • Demonstration of the DFOS as a high-performance ultrasonic hydrophone.
    • Significant improvements in signal-to-noise ratio compared to existing technologies.

    Conclusions:

    • The proposed theory and critical test provide a framework for DFOS development.
    • The novel purely Fabry-Perot DFOS offers superior performance for acoustic and ultrasonic detection.
    • MEMS fabrication enables the creation of advanced fiber-optic sensors with enhanced capabilities.