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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Implementation of a Reference Interferometer for Nanodetection
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Published on: April 26, 2014

Double sinusoidal phase-modulating distributed-Bragg-reflector laser-diode interferometer for distance measurement.

Takamasa Suzuki1, Hiromi Suda, Osami Sasaki

  • 1Faculty of Engineering, Niigata University, 8050 Ikarashi 2, Niigata 950-2181, Japan. takamasa@eng.niigata-u.ac.jp

Applied Optics
|January 10, 2003
PubMed
Summary
This summary is machine-generated.

A novel static double sinusoidal phase-modulating (DSPM) interferometer eliminates mechanical vibrations for improved distance measurements. This new design achieves high accuracy, with experimental results showing a measurement error of +/- 1.6 micrometers.

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Area of Science:

  • Optics and Photonics
  • Metrology and Measurement Science

Background:

  • Traditional double sinusoidal phase-modulating (DSPM) laser-diode interferometers measure distances beyond a half-wavelength by analyzing modulation depth.
  • These systems often rely on a vibrating mirror, which can introduce inaccuracies into the interference signal and compromise measurement precision.

Purpose of the Study:

  • To develop a static-type DSPM laser-diode interferometer that eliminates the need for mechanical modulation.
  • To enhance measurement accuracy by removing vibration-induced errors inherent in previous DSPM designs.

Main Methods:

  • Implementation of a novel static-type double sinusoidal phase-modulating (DSPM) laser-diode interferometer.
  • Elimination of mechanical components for modulation, relying on static signal generation.
  • Experimental validation of the static DSPM interferometer's performance.

Main Results:

  • The static-type DSPM laser-diode interferometer successfully operated without mechanical modulation.
  • Experimental measurements demonstrated a high degree of accuracy.
  • A minimal measurement error of +/- 1.6 micrometers was achieved.

Conclusions:

  • The proposed static-type DSPM laser-diode interferometer offers a vibration-free approach to distance measurement.
  • This innovation significantly improves accuracy compared to systems requiring mechanical modulation.
  • The static DSPM interferometer presents a promising advancement in precision metrology.