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関連する概念動画

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

1.6K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.6K
Sound Waves: Interference00:53

Sound Waves: Interference

5.0K
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...
5.0K
Sound as Pressure Waves01:17

Sound as Pressure Waves

4.7K
Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
4.7K
Sound Waves: Resonance01:14

Sound Waves: Resonance

3.6K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
3.6K
Perception of Sound Waves01:01

Perception of Sound Waves

5.9K
The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
5.9K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

833
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
833

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Updated: Mar 14, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display
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Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

Published on: January 14, 2020

10.4K

音響のためのホログラム

Kai Melde1, Andrew G Mark1, Tian Qiu1

  • 1Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, 70569 Stuttgart, Germany.

Nature
|September 23, 2016
PubMed
まとめ
この要約は機械生成です。

精密な超音波束の制御のために 単体音響ホログラムを開発しました この画期的な技術により 複雑な3Dの音響場が生まれ 操作,イメージング,パワー転送の 既存の技術を上回るのです

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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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関連する実験動画

Last Updated: Mar 14, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display
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Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

Published on: January 14, 2020

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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging

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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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科学分野:

  • 音声ホログラフィー
  • 波長の再構築
  • 3D 音場生成

背景:

  • ホログラム技術は 光学と音響の空間制御に不可欠です
  • コンピュータによるホログラフィーは 波長の再構築のための相プロファイルを 計算します
  • ディスクレートソースを使用する現在の超音波アプリケーションは,自由度が制限されています.

研究 の 目的:

  • 任意の超音波束の生成のための単体音響ホログラムを導入する.
  • 波長の再構築においてより高い自由度を達成する.
  • 超音波操作と無接触のパワー転送における新しいアプリケーションを実証する.

主な方法:

  • 音声ホログラムの迅速な製造
  • 偏光に制限された音圧場の再構築.
  • 複雑な3D圧力と相分布を利用して操作する.

主要な成果:

  • 商用フェーズ配列よりも2度高い自由度を達成した.
  • 様々な媒体の固体と液体の制御された超音波操作を証明した.
  • 低コストでスケーラブルな 音響ホログラフィーの技術を開発した

結論:

  • モノリシック・アコースティック・ホログラムは 伝統的な方法よりも 重要な進歩を遂げています
  • この技術はビーム・ステアリング,コンタクトレス・パワー・トランスファー,および医療画像の 新しい機能を可能にします.
  • 音声ホログラムは 様々な超音波の応用において 革新を起こす準備ができています