Near Field Sonic Boom Test on Two Low-Boom Configurations Using Multiple Measurement Techniques at NASA Ames (Invited)

2011 ◽  
Author(s):  
Donald Durston ◽  
Susan Cliff ◽  
Thomas Wayman ◽  
Jason Merret ◽  
Alaa Elmiligui ◽  
...  
Keyword(s):  
Near Field ◽  
Measurement Techniques ◽  
Sonic Boom ◽  
Multiple Measurement

scholarly journals Specialized CFD Grid Generation Methods for Near-Field Sonic Boom Prediction

2014 ◽  
Author(s):  
Michael A. Park ◽  
Richard L. Campbell ◽  
Alaa A. Elmiligui ◽  
Susan E. Cliff ◽  
Sudheer Nayani
Keyword(s):  
Near Field ◽  
Grid Generation ◽  
Sonic Boom

scholarly journals Hybrid multilevel plane wave based near-field far-field transformation utilising combined near- and far-field translations

2009 ◽  
Vol 7 ◽  
pp. 17-22 ◽  
Author(s):  
C. H. Schmidt ◽  
T. F. Eibert
Keyword(s):  
Near Field ◽  
Measurement Techniques ◽  
Plane Waves ◽  
Low Complexity ◽  
Far Field ◽  
Computation Complexity ◽  
Low Frequencies ◽  
Field Transformation ◽  
Translation Operators ◽  
Equivalent Sources

Abstract. The radiation of large antennas and those operating at low frequencies can be determined efficiently by near-field measurement techniques and a subsequent near-field far-field transformation. Various approaches and algorithms have been researched but for electrically large antennas and irregular measurement contours advanced algorithms with low computation complexity are required. In this paper an algorithm employing plane waves as equivalent sources and utilising efficient diagonal translation operators is presented. The efficiency is further enhanced using simple far-field translations in combination with the expensive near-field translations. In this way a low complexity near-field transformation is achieved, which works for arbitrary sample point distributions and incorporates a full probe correction without increasing the complexity.

scholarly journals Efficient Near-Field to Mid-Field Sonic Boom Propagation Using a High-Order Space Marching Method

2019 ◽  
Author(s):  
Jeffrey A. Housman ◽  
Gaetan K. Kenway ◽  
James C. Jensen ◽  
Cetin C. Kiris
Keyword(s):  
Near Field ◽  
High Order ◽  
Sonic Boom ◽  
Marching Method

Numerical study of the of sonic boom near-field

2019 ◽  
Author(s):  
P. A. Mishchenko ◽  
T. A. Kiseleva
Keyword(s):  
Numerical Study ◽  
Near Field ◽  
Sonic Boom

Euler code prediction of near-field to midfield sonic boom pressure signatures

1993 ◽  
Vol 30 (6) ◽  
pp. 911-917 ◽  
Author(s):  
M. J. Siclari ◽  
C. M. Darden
Keyword(s):  
Near Field ◽  
Sonic Boom

scholarly journals Sonic Boom Calculations in the Near Field.

1993 ◽  
Vol 41 (477) ◽  
pp. 584-589 ◽  
Author(s):  
Akihiko YOSHIDA ◽  
Kazuhiro NAKAHASHI ◽  
Shoichi FUJII
Keyword(s):  
Near Field ◽  
Sonic Boom

scholarly journals Design and Optimization of Plasmon Resonance Sensor Based on Micro–Nano Symmetrical Localized Surface

Symmetry ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 841
Author(s):  
Fengyu Yin ◽  
Jin Liu ◽  
Haima Yang ◽  
Aleksey Kudreyko ◽  
Bo Huang
Keyword(s):  
Refractive Index ◽  
Plasmon Resonance ◽  
Incident Angle ◽  
Near Field ◽  
Measurement Techniques ◽  
Fdtd Simulation ◽  
Localized Surface Plasmon ◽  
Small Scale ◽  
Surface Plasma Resonance ◽  
Resonance Sensor

Surface Plasma resonance (SPR) sensors combined with biological receptors are widely used in biosensors. Due to limitations of measurement techniques, small-scale, low accuracy, and sensitivity to the refractive index of solution in traditional SPR prism sensor arise. As a consequence, it is difficult to launch commercial production of SPR sensors. The theory of localized surface plasmon resonance (LSPR) developed based on SPR theory has stronger coupling ability to near-field photons. Based on the LSPR sensing theory, we propose a submicron-sized golden-disk and graphene composite structure. By varying the thickness and diameter of the array disk, the performance of the LSPR sensor can be optimized. A graphene layer sandwiched between the golden-disk and the silver film can prevent the latter from oxidizing. Symmetrical design enables high-low concentration of dual-channel distributed sensing. As the fixed light source, we use a 632.8-nm laser. A golden nano-disk with 45 nm thickness and 70 nm radius is designed, using a finite difference time domain (FDTD) simulation system. When the incident angle is 42°, the figure of merit (FOM) reaches 8826, and the measurable refractive index range reaches 0.2317.

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