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相关概念视频

Shock Waves01:16

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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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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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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球体冲击波形重建通过异质干涉测量.

Carl R Hart1, Gregory W Lyons2, Michael J White3

  • 1U.S. Army Engineer Research Development Center, Cold Regions Research and Engineering Laboratory, Hanover, New Hampshire 03755, USA.

The Journal of the Acoustical Society of America
|January 29, 2024
PubMed
概括

一种新方法直接从声光传感数据中重建冲击波折射指数场. 与传统的阿贝尔倒置相比,这种技术提高了波形精度,提供了更好的冲击波分析.

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科学领域:

  • 物理 物理学 物理
  • 光学工程是指光学工程.
  • 声学 声学 在声学方面

背景情况:

  • 声光传感间接测量冲击波形状,需要从预测数据中进行场景重建.
  • 阿贝尔反向积分变换是重建的一个常见方法,假设球面对称.
  • 异质马赫-泽恩德干扰仪,就像激光多普勒振动仪一样,测量光学相差时间导数.

研究的目的:

  • 开发一种新的技术,从声光传感数据直接重建波动折射率场.
  • 为了比较新的直接重建方法与阿贝尔反向积分变换的准确性.
  • 将直接重建方法应用于激光诱导冲击波的实验数据.

主要方法:

  • 通过假设探针束的局部平面波 propagation 来得出一个直接的重建技术.
  • 使用合成数据验证了衍生技术,并与阿贝尔反转方法进行了比较.
  • 该方法应用于激光诱导冲击波的实验数据.

主要成果:

  • 与阿贝尔倒置相比,直接重建方法在时间波形重建中取得了更高的准确性.
  • 阿贝尔倒置方法显示波形尾部的不准确性,对应于靠近虚拟起源的位置.
  • 直接重建消除了对时间集成的需求,提高了峰值,上升时间和正相持续时间的准确性.

结论:

  • 波动折射率场的直接重建为冲击波形状分析提供了卓越的准确性.
  • 这种方法提高了冲击波表征的可靠性,特别是对于峰值和时间特征.
  • 该技术为声光传感应用提供了一个比阿贝尔逆转更准确的替代方案.