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Micro-tip Cantilever as Low Frequency Microphone.

Sumit Dass1, Rajan Jha2

  • 1Nanophotonics and Plasmonics Laboratory, School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Khurda, 752050, India.

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|August 25, 2018
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Summary
This summary is machine-generated.

We developed a compact, diaphragm-free optical microphone using a micro-tip cantilever to detect low-frequency acoustic signals. This innovative sensor offers tunable sensitivity and a wide linear frequency range, making it a cost-effective acoustic sensing solution.

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Area of Science:

  • Photonics
  • Acoustics
  • Microelectromechanical systems (MEMS)

Background:

  • Traditional microphones often rely on diaphragms, which can limit performance and increase size.
  • Optical sensing offers a potential alternative for acoustic detection with advantages in miniaturization and immunity to electromagnetic interference.

Purpose of the Study:

  • To propose and characterize a novel, compact, diaphragm-free optical microphone for detecting low-frequency acoustic signals.
  • To investigate the key parameters influencing the sensitivity and working range of the proposed optical microphone.

Main Methods:

  • A tapered micro-tip cantilever was designed to interact with acoustic pressure.
  • Changes in light coupling between the micro-tip and a single-mode fiber (SMF) were used for signal detection.
  • The influence of cantilever length, fiber-tip distance, and axial offset on sensor performance was analyzed.

Main Results:

  • The optical microphone demonstrated a maximum acoustic sensitivity of 10.63 mV/Pa (-159.5 dB re 1 V/μPa).
  • A noise-limited minimum detectable pressure of 19.1 mPa/√Hz was achieved.
  • A linear frequency response was observed in the range of 0-400 Hz.

Conclusions:

  • The proposed diaphragm-free optical microphone is a compact and effective solution for low-frequency acoustic sensing.
  • Sensor performance can be readily tuned by adjusting the micro-tip cantilever geometry and fiber alignment.
  • The SMF-only structure and photodetector-based interrogation enable an economical acoustic sensing system.