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Related Concept Videos

Graphical and Analytic Representation of Sinusoids01:20

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Analyzing two sinusoidal voltages with equal amplitude and period but different phases on an oscilloscope, an instrument used to display and analyze waveforms, involves a three-step process.
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Implementation of a Reference Interferometer for Nanodetection
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Range-resolved interferometric signal processing using sinusoidal optical frequency modulation.

Thomas Kissinger, Thomas O H Charrett, Ralph P Tatam

    Optics Express
    |May 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    A new signal processing method enables highly linear interferometric phase measurements using a continuous-wave laser diode. This technique allows multiplexing multiple interferometers with continuously variable path differences for practical applications.

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    Area of Science:

    • Optical Metrology
    • Signal Processing
    • Laser Interferometry

    Background:

    • Interferometric phase measurements are crucial in various scientific and engineering fields.
    • Existing techniques often face limitations in linearity, setup complexity, or multiplexing capabilities.

    Purpose of the Study:

    • To introduce a novel signal processing technique for highly linear interferometric phase measurements.
    • To demonstrate a practical, self-referencing setup utilizing inexpensive laser diode sources.
    • To enable multiplexing of multiple interferometers with continuously variable optical path differences.

    Main Methods:

    • Employing sinusoidal optical frequency modulation of a continuous-wave laser diode.
    • Utilizing a smooth window function for signal demodulation to suppress unwanted components.
    • Developing a self-referencing interferometric setup.

    Main Results:

    • Achieved highly linear interferometric phase measurements.
    • Successfully multiplexed three interferometers with unequal and continuously variable optical path differences.
    • Demonstrated robustness against instrument drift and quantified measurement linearity.

    Conclusions:

    • The proposed signal processing technique offers a practical and versatile approach for interferometric measurements.
    • The method enhances linearity and allows for flexible multiplexing, overcoming limitations of prior work.
    • This technique has broad applicability in fields requiring precise optical path difference measurements.