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Related Concept Videos

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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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Related Experiment Video

Updated: Jun 14, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

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Published on: August 12, 2013

Dynamic interferometry techniques for optical path length measurements.

A Olsson, C L Tang

    Applied Optics
    |April 8, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Two novel dynamic interferometric techniques using tunable lasers are presented. These methods enable precise phase modulation measurements and real-time optical thickness determination for transparent materials.

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    Area of Science:

    • Optics and Photonics
    • Laser Interferometry
    • Metrology

    Background:

    • Interferometric techniques are crucial for precise measurements.
    • Challenges include dc drifts and low-frequency noise.
    • Real-time optical thickness measurement of transparent materials is often required.

    Purpose of the Study:

    • To introduce two novel dynamic interferometric techniques.
    • To demonstrate experimental validation of these techniques.
    • To address limitations of existing interferometric methods.

    Main Methods:

    • Utilized electrically tunable lasers for dynamic control.
    • Developed a technique for phase modulation measurement independent of drifts and noise.
    • Implemented a frequency modulation (FM) technique for continuous measurements.

    Main Results:

    • Successfully measured small phase modulations in interferometers.
    • Achieved measurements independent of dc drifts and low-frequency noise.
    • Demonstrated real-time, noncontact measurement of optical thickness for transparent materials.

    Conclusions:

    • Electrically tunable lasers enable advanced interferometric techniques.
    • The presented methods offer enhanced precision and real-time capabilities.
    • These techniques are suitable for various applications in metrology and material science.