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Related Concept Videos

Interference: Path Lengths01:10

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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.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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Time and frequency -Domain Interpretation of Phase-lag Control01:21

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Parallel Resonance01:23

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Updated: Apr 3, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Reducing coherent noise in interference systems using the phase modulation technique.

Ji-Wen Cui, Zhang Tao, Zhao-Bo Liu

    Applied Optics
    |September 15, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Phase modulation effectively reduces coherent noise in interferometers by minimizing interference from spurious signals. This technique significantly improves fringe quality and contrast, as demonstrated in simulations and experiments.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Signal Processing

    Background:

    • Coherent noise from spurious interference degrades the performance of optical interferometers.
    • Maintaining signal integrity while suppressing noise is crucial for accurate measurements.

    Purpose of the Study:

    • To introduce and validate a phase modulation technique for reducing coherent noise in interference systems.
    • To assess the effectiveness of the method in improving fringe quality and reducing phase errors.

    Main Methods:

    • Employing a phase modulation technique with a carefully selected driving signal.
    • Simulating the technique's impact on grating and Twyman interferometers.
    • Conducting experimental verification using a phase-modulated Twyman interferometer.

    Main Results:

    • Phase error caused by coherent noise reduced by an average of 81.53% in grating interferometers.
    • Significant improvement in fringe quality and contrast observed in Twyman interferometers.
    • Experimental validation confirmed the technique's feasibility and effectiveness.

    Conclusions:

    • Phase modulation is a highly effective method for mitigating coherent noise in optical interference systems.
    • The technique preserves the coherent function of the desired signal while suppressing noise.
    • This approach offers a practical solution for enhancing the performance of various interferometric setups.