A high resolution direction-of-arrival algorithm for narrow-band coherent and incoherent sources

1988 ◽  
Vol 36 (7) ◽  
pp. 965-979 ◽  
Author(s):  
J.A. Cadzow
Keyword(s):  
High Resolution ◽  
Narrow Band ◽  
Direction Of Arrival

VIS-NIR LED Illumination in Backside Circuit Edit and Optical Probing Applications

2012 ◽  
Author(s):  
Shida Tan ◽  
Richard H. Livengood ◽  
Dane Scott ◽  
Roy Hallstein ◽  
Pat Pardy ◽  
...  
Keyword(s):  
High Resolution ◽  
Image Quality ◽  
Optical Imaging ◽  
Narrow Band ◽  
Light Emitting Diode ◽  
Air Gap ◽  
Optical Image ◽  
Proof Of Concept ◽  
Light Emitting ◽  
Optical Probing

Abstract High resolution optical imaging is critical in assisting backside circuit edit (CE) and optical probing navigation. In this paper, we demonstrated improved optical image quality using VIS-NIR narrow band light emitting diode (LED) illumination in various FIB and optical probing platforms. The proof of concept was demonstrated with both common non-contact air gap lenses and solid immersion lenses (SIL).

The role of high-resolution endoscopy and narrow-band imaging in the evaluation of upper GI neoplasia in familial adenomatous polyposis

2013 ◽  
Vol 77 (4) ◽  
pp. 542-550 ◽  
Author(s):  
Maria Lopez-Ceron ◽  
Frank J.C. van den Broek ◽  
Elisabeth M. Mathus-Vliegen ◽  
Karam S. Boparai ◽  
Susanne van Eeden ◽  
...  
Keyword(s):  
High Resolution ◽  
Familial Adenomatous Polyposis ◽  
Narrow Band ◽  
Narrow Band Imaging ◽  
Adenomatous Polyposis ◽  
Upper Gi

scholarly journals Spectroscopy of LMC cluster stars

2019 ◽  
Vol 14 (S351) ◽  
pp. 97-100
Author(s):  
A. K. Dupree ◽  
C. I. Johnson ◽  
M. Mateo ◽  
A. P. Milone
Keyword(s):  
High Resolution ◽  
Globular Cluster ◽  
Narrow Band ◽  
Rotating Stars ◽  
Photometric Measurements ◽  
Rapidly Rotating Stars

AbstractHigh resolution spectra of stars in the ≈200 Myr LMC globular cluster, NGC 1866, reveal rapidly rotating stars with variable H α emission and absorption, and signatures of outflowing material. The variable H α line can substantially affect photometric measurements obtained with HST/WFC3 narrow-band filters.

scholarly journals Underwater Ambiguity Elimination Method Based on Co-Prime Sensor Array

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6058
Author(s):  
Tian Lan ◽  
Yilin Wang ◽  
Longhao Qiu
Keyword(s):  
High Resolution ◽  
Sensor Array ◽  
Direction Of Arrival ◽  
Doa Estimation ◽  
Spatial Spectrum ◽  
Estimation Methods ◽  
Sensing Applications ◽  
Passive Sensing ◽  
Spatial Spectra ◽  
Beam Patterns

Recently, the direction of arrival estimation with co-prime arrays has gradually been applied in underwater scenarios because of its significant advantages over traditional uniform linear arrays. Despite the advantages of co-prime arrays, the spatial spectra obtained directly from conventional beamforming can be degraded by grating lobes due to the sparse spatial sampling in passive sensing applications, which will seriously deteriorate the estimation performance. In this paper, capon beamforming is applied to a co-prime sensor array as a pretreatment before high-resolution direction of arrival (DOA) estimation methods. The amplitudes extracted from the beam-domain outputs of two subarrays and the phases extracted from the cross-spectrum of the spatial spectrum are exploited to suppress the spurious peaks in beam patterns and eliminate ambiguities. Consequently, interference can be further mitigated, and the performance of high-resolution DOA methods will be guaranteed. Simulations show that the method proposed can improve the reliability and accuracy of DOA estimation with great value in practice.

scholarly journals INTENSITY INTERFEROMETRY FOR THE 21ST CENTURY

2013 ◽  
Vol 02 (02) ◽  
pp. 1340009 ◽  
Author(s):  
E. P. HORCH ◽  
G. VAN BELLE ◽  
R. M. GENET ◽  
B. D. HOLENSTEIN
Keyword(s):  
High Resolution ◽  
21St Century ◽  
Narrow Band ◽  
Single Photon ◽  
Narrow Band Imaging ◽  
Avalanche Diode ◽  
Intensity Interferometry ◽  
The Future ◽  
Research Grade ◽  
Detector Technology

Advances in detector technology and electronic timing capabilities in recent years have resulted in a new opportunity for ultra-high resolution in astronomy using intensity interferometry. We have been working with this technology and describe here the potential as we see it. Two separate opportunities exist at present: the use of Single Photon Avalanche Diode (SPAD) detectors with existing research-grade telescopes and photomultipliers coupled with light bucket telescopes. In the future, there may also be potential for space-based intensity interferometry. While intensity interferometry is not likely to replace amplitude-based interferometry, it does have certain advantages in terms of portability, use of large baselines, narrow-band imaging, and imaging in the blue. We see a new possibility for its use particularly in stellar astrophysics for these reasons.

scholarly journals Morphological and kinematical analysis of the planetary nebula Hu 1-2 and its irradiated bow-shocks

2011 ◽  
Vol 7 (S283) ◽  
pp. 440-441
Author(s):  
Luis F. Miranda ◽  
Mónica Blanco ◽  
Martín A. Guerrero ◽  
Angels Riera
Keyword(s):  
High Resolution ◽  
High Velocity ◽  
Planetary Nebula ◽  
Narrow Band ◽  
Central Star ◽  
Kinematical Analysis ◽  
Near Ir ◽  
Bow Shocks

AbstractWe present narrow-band optical and near-IR images, and high-resolution long-slit spectra of the planetary nebula Hu 1-2 that allow us to make a detailed description of its unusual morphology and internal kinematics. The data also reveal that the ansae of Hu 1-2 probably represent bow-shocks associated to high velocity outflows that are irradiated from the central star.

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