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Acoustics and Ultrasonics

The physics of sound and ultrasound, including wave propagation, acoustic materials, noise control, ultrasonic imaging, acoustic metamaterials, and applications in medicine and industry

4 papers in this specialization

Paperzilla Papers in Acoustics and Ultrasonics

Recent Advances in Lensless Imaging

Lensless imaging, which replaces traditional lenses with optical modulators and computational reconstruction algorithms, offers advantages in size, weight, cost, and scalability. Various lensless imaging techniques, including illumination-modulated, mask-modulated, and programmable-modulator systems, have emerged, each with unique characteristics and applications in areas like microscopy, photography, and 3D imaging.

Single-shot lensless imaging with Fresnel zone aperture and incoherent illumination

This paper introduces a single-shot lensless imaging method using a Fresnel zone aperture and incoherent illumination. The technique eliminates the need for multiple masks or shots, reconstructing images with significantly improved signal-to-noise ratio by using compressive sensing to mitigate twin-image artifacts common in conventional lensless methods.

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s41377-020-0289-9.pdf

Jul 14, 11:28 AM

Hyperspectral terahertz microscopy via nonlinear ghost imaging

This paper demonstrates a novel Time-Resolved Nonlinear Ghost Imaging technique for hyperspectral THz microscopy. By combining nonlinear wavelength conversion, time-resolved detection, and computational imaging, the technique overcomes limitations of traditional methods in near-field imaging due to space-time coupling, enabling high-fidelity image and spectral reconstruction of samples like metallic structures and a leaf.

Far-field super-resolution ghost imaging with a deep neural network constraint

Researchers developed a new "ghost imaging" method that uses AI to reconstruct high-resolution images from very limited data. This technique overcomes the limitations of traditional ghost imaging, allowing for better image quality and faster acquisition times, even in challenging conditions like low light or far-field imaging.

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s41377-021-00680-w.pdf

Jul 14, 11:28 AM