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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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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:
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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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Sound as Pressure Waves01:17

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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.
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Sound Waves: Resonance01:14

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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...
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Perception of Sound Waves01:01

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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.
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Double Resonance Techniques: Overview01:12

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

Kai Melde1, Andrew G Mark1, Tian Qiu1

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

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|September 23, 2016
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Summary
This summary is machine-generated.

Researchers developed monolithic acoustic holograms for precise ultrasound beam control. This breakthrough enables complex 3D acoustic fields, surpassing current technologies for applications in manipulation, imaging, and power transfer.

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Area of Science:

  • Acoustic holography
  • Wavefront reconstruction
  • 3D acoustic field generation

Background:

  • Holographic techniques are crucial for spatial control of optical and acoustic fields.
  • Computer-generated holography calculates phase profiles for wavefront reconstruction.
  • Current ultrasound applications using discrete sources have limited degrees of freedom.

Purpose of the Study:

  • To introduce monolithic acoustic holograms for arbitrary ultrasound beam generation.
  • To achieve higher degrees of freedom in acoustic wavefront reconstruction.
  • To demonstrate novel applications in ultrasonic manipulation and contactless power transfer.

Main Methods:

  • Rapid fabrication of monolithic acoustic holograms.
  • Reconstruction of diffraction-limited acoustic pressure fields.
  • Utilizing complex 3D pressure and phase distributions for manipulation.

Main Results:

  • Achieved reconstruction degrees of freedom two orders of magnitude higher than commercial phased arrays.
  • Demonstrated controlled ultrasonic manipulation of solids and liquids in various media.
  • Developed an inexpensive and scalable technique for acoustic holography.

Conclusions:

  • Monolithic acoustic holograms offer significant advancements over traditional methods.
  • The technology enables new capabilities in beam-steering, contactless power transfer, and medical imaging.
  • Acoustic holograms are poised to drive innovation across diverse ultrasound applications.