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Updated: Jul 7, 2026

Measuring Diaphragm Thickness and Function Using Point-of-Care Ultrasound
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Direct optical digital detection of diaphragm deflection: maximum resolution.

H Mada1, Y Muramatsu

  • 1Tokyo University of Agriculture & Technology, Faculty of Technology, Department of Electronic Engineering, Koganei, Tokyo 184, Japan.

Applied Optics
|March 1, 1986
PubMed
Summary

This study demonstrates optical digital detection of mechanical diaphragm motion using a Michelson interferometer. An 8-bit analog-to-digital conversion was achieved, highlighting potential for high-resolution motion sensing.

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Area of Science:

  • Optics
  • Mechanical Engineering
  • Signal Processing

Background:

  • Analog mechanical motion detection often requires complex electronic systems.
  • Optical interferometry offers a non-contact method for precise measurement.
  • Acoustic pressure-induced diaphragm deformation is a key phenomenon in various sensors.

Purpose of the Study:

  • To develop and validate a direct optical digital detection method for analog mechanical diaphragm motion.
  • To theoretically and experimentally investigate the performance of a Michelson interferometer for this application.
  • To determine the factors influencing the resolution of optical analog-to-digital (A-D) conversion.

Main Methods:

  • Utilizing a Michelson interferometer to detect diaphragm deformation caused by acoustic pressure.

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Last Updated: Jul 7, 2026

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  • Employing a He-Ne laser, a 2.54-cm diameter diaphragm, and multimode optical fibers as the detector.
  • Performing theoretical calculations to assess the impact of detector width on resolution.

    • Main Results:

    • Theoretical analysis indicates a maximum resolution of 9 bits with a single-mode optical fiber detector.
    • Experimental results achieved an 8-bit A-D conversion using multimode optical fibers.
    • The study confirms the feasibility of optical digital detection for mechanical motion.

    Conclusions:

    • Michelson interferometry provides an effective means for the direct optical digital detection of mechanical diaphragm motion.
    • Detector width is a critical parameter for optimizing the resolution of optical A-D conversion.
    • The demonstrated 8-bit resolution shows promise for applications requiring precise optical sensing of acoustic pressure.