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Related Experiment Video

Updated: Feb 2, 2026

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
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A coupler-based calibration method for ear-probe microphones.

Kren Rahbek Nørgaard1, Efren Fernandez-Grande1, Søren Laugesen2

  • 1Department of Electrical Engineering, Acoustic Technology, Technical University of Denmark, Ørsteds Plads, Building 352, Kongens Lyngby, DK-2800, Denmark.

The Journal of the Acoustical Society of America
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Summary

This study presents a new method for calibrating ear-probe microphones using an acoustic coupler and a reference microphone. The technique accurately measures microphone sensitivity for precise in situ acoustic response measurements.

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Area of Science:

  • Acoustics
  • Metrology
  • Bioacoustics

Background:

  • Accurate calibration of ear-probe microphones is crucial for precise in situ stimulus level calibration and ear acoustic response measurement.
  • Existing methods may lack practicality or require specialized equipment.

Purpose of the Study:

  • To propose and validate a practical methodology for measuring ear-probe microphone sensitivity.
  • To enable reliable in situ sound pressure measurements and stimulus calibration in clinical settings.

Main Methods:

  • Acoustic Thévenin calibration of the ear probe to measure coupler input impedance.
  • Analytical calculation of the coupler's plane-wave transfer impedance.
  • Estimation of the pressure transfer function between a reference and the ear-probe microphone.

Main Results:

  • The proposed method successfully estimated ear-probe microphone sensitivity.
  • Results were compared to an existing method and showed substantially similar sensitivities.
  • The method demonstrated practical feasibility for reliable measurements.

Conclusions:

  • The proposed methodology offers a practical and reliable approach for ear-probe microphone calibration.
  • This technique enhances the precision of acoustic measurements within the ear canal.
  • It supports accurate stimulus level calibration in clinical audiology.