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   Articles with "focal depth" as a keyword



Low cost and long-focal-depth metallic axicon for terahertz frequencies based on parallel-plate-waveguides

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recommendations! Published in 2021 at "Scientific Reports"

DOI: 10.1038/s41598-021-82503-x

Abstract: In this work we demonstrate a triangular surface lens (axicon) operating at frequencies between 350 and 450 GHz using parallel-plate-waveguide technology. The proposed axicon offers longer focal depth characteristics compared to conventional plastic lenses, surpassing common… read more here.

Keywords: low cost; parallel plate; focal depth; axicon ... See more keywords

TTNN: A Physically Guided Deep Learning Model for Focal Depth and Epicenter Distance Estimation Based on Multistation Waveforms

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recommendations! Published in 2024 at "IEEE Transactions on Geoscience and Remote Sensing"

DOI: 10.1109/tgrs.2024.3451554

Abstract: Earthquake localization is an important part of the seismicity monitoring workflow and catalog building, and it plays a fundamental role in earthquake research. The accurate estimation of the focal depth and epicenter distance is a… read more here.

Keywords: epicenter; deep learning; depth epicenter; epicenter distance ... See more keywords

Ultrasound Pixel-Based Beamforming With Phase Alignments of Focused Beams

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recommendations! Published in 2017 at "IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control"

DOI: 10.1109/tuffc.2017.2685198

Abstract: We previously developed unified pixel-based (PB) beamforming to generate high-resolution sonograms, based on field pattern analysis. In this framework, we found that the transmit waveshape away from the focus could be characterized by two spherical… read more here.

Keywords: resolution; beamforming phase; pixel based; focal depth ... See more keywords

Accelerating superluminal laser focus generated by a long-focal-depth mirror with high numerical aperture.

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recommendations! Published in 2023 at "Optics express"

DOI: 10.1364/oe.478768

Abstract: The long-focal-depth mirror is a novel reflective element proposed in recent years. Due to the advantages of negligible dependence on wavelength and high damage threshold, it is suitable to focus ultra-short laser pulses with broadband… read more here.

Keywords: focal depth; laser focus; focus; long focal ... See more keywords

Seismicity and thermal structure of the St. Paul Transform System, equatorial Atlantic: insights from focal depth analysis

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recommendations! Published in 2025 at "Solid Earth"

DOI: 10.5194/se-16-1059-2025

Abstract: Abstract. The slow-spreading Mid-Atlantic Ridge is segmented and offset by transform faults. Among these, the St. Paul Transform System (SPTS), located in the equatorial Mid-Atlantic Ridge, is a complex multi-fault system with four transform faults (Transform A,… read more here.

Keywords: system; structure; transform system; focal depth ... See more keywords