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関連する概念動画

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

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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.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
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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.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
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Properties of Fourier Transform I01:21

Properties of Fourier Transform I

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The application of Fourier Transform properties in radio broadcasting is multifaceted, enabling significant advancements in the way signals are transmitted and received. Key areas where these properties are utilized include simultaneous multi-channel transmission, audio clip speed adjustments, live broadcast delays for different time zones, audio frequency adjustments, and signal demodulation.
In radio broadcasting, multiple audio signals often need to be transmitted simultaneously. The Fourier...
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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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Properties of Fourier Transform II01:24

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The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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周波数は相乱によって誘発される.

Marco Piccardo1,2, Benedikt Schwarz3,4, Dmitry Kazakov3

  • 1Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA. piccardo@g.harvard.edu.

Nature
|June 20, 2020
PubMed
まとめ
この要約は機械生成です。

半導体リングレーザーは,以前は極端な条件が必要と考えられていた,低いポンプレベルでの光学周波数を生成することができます. この突破は,超高速増強とライン幅の増強によって引き起こされる不安定なフェーズ・ターブランスによって達成されます.

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科学分野:

  • 光学について
  • 非線形光学
  • レーザー物理学

背景:

  • 波の不安定さは 水力力学における渦巻を誘発し 光学学における周波数コンブにつながります
  • 光学周波数は,非線形相互作用と一貫したロックメカニズムによって生成される周期的な光波形です.
  • マイクロレゾナータのでは,レゾナータの分散とKerr非線形性から不安定性が発生し,通常は極端なポンプが要求されるリングレーザーとは異なり,

研究 の 目的:

  • 半導体リングレーザーが 低ポンプレベルでの周波数コンブレージを 達成できることを示すために
  • 半導体リングレーザーの周波数を有効にする段階の乱流の役割を調査する.
  • 半導体リングレーザーの動作を マイクロレゾナータの周波数カムと接続する

主な方法:

  • 半導体リングレーザーを利用して 超高速の増強を回復します
  • 不安定メカニズムとしての相乱を調査する.
  • ジンズバーグ・ランドー形式主義を適用して不安定な条件を策定する.

主要な成果:

  • 半導体リングレーザーは,以前の仮定に反して,低いポンプレベルでの周波数のレジムを示します.
  • 線幅の増幅による相振動による相振動が不安定性を引き起こす.
  • 観測された局所的な構造は,消散性ケールソリトンと特性を共有しています.

結論:

  • 半導体リングレーザーは,非極端な条件下で,相乱を介して光学周波数を生成することができます.
  • この研究は半導体リングレーザーとマイクロ共振器の周波数との間のリンクを確立します.
  • この発見は,半導体デバイスにおける周波数生成の探索のための新しい道を開きます.