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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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Related Experiment Video

Updated: Jun 20, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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Published on: January 28, 2019

Digital phase-measuring interferometry with a tunable laser diode.

Y Ishii, J Chen, K Murata

    Optics Letters
    |September 10, 2009
    PubMed
    Summary

    A novel digital phase-measuring interferometer uses a laser diode and fringe scanning with wavelength changes. This method accurately measures phase shifts for precise optical measurements.

    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Laser Technology

    Background:

    • Phase-measuring interferometry is crucial for precise optical metrology.
    • Traditional methods can be complex and require stable environmental conditions.

    Purpose of the Study:

    • To develop a digital phase-measuring interferometer using a laser diode source.
    • To implement a fringe-scanning technique with stepwise wavelength changes for phase measurement.
    • To achieve accurate phase extraction using a robust algorithm.

    Main Methods:

    • Utilized a laser-diode source with stepwise wavelength changes controlled by injection current.
    • Employed a fringe-scanning technique to introduce relative phase shifts between interferometer arms.
    • Applied a phase-extraction algorithm based on one-dimensional least-squares fits to cosine fringe functions.

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    Main Results:

    • Successfully developed and demonstrated a digital phase-measuring interferometer.
    • Achieved accurate phase shifts through calibrated wavelength variations.
    • Experimental results validated the effectiveness of the phase-extraction algorithm.

    Conclusions:

    • The developed digital phase-measuring interferometer offers a precise and potentially more accessible method for optical measurements.
    • The combination of laser diode wavelength tuning and fringe scanning provides a robust approach to phase extraction.
    • This technique holds promise for various applications in optical metrology and surface analysis.