Visualization of radiated emission sources on a wire using far field amplitude data

2003 ◽  
Author(s):  
Y. Ishida ◽  
Y. Yamaguchi ◽  
N. Kuwabara ◽  
M. Tokuda
Keyword(s):  
Field Amplitude ◽  
Emission Sources ◽  
Far Field ◽  
Amplitude Data ◽  
Radiated Emission

On: “Effect of temporal and spatial variations of the primary signal on VLF total‐field surveys” by M. A. Vallee, M. Chouteau, and G. J. Palacky (January 1992 GEOPHYSICS, p. 97‐105)

Geophysics ◽  
1993 ◽  
Vol 58 (5) ◽  
pp. 756-756 ◽  
Author(s):  
Jean Roy
Keyword(s):  
Numerical Modeling ◽  
Field Amplitude ◽  
Primary Field ◽  
Dense Network ◽  
Total Field ◽  
Field Surveys ◽  
Attitude Stability ◽  
Amplitude Data ◽  
Primary Signal ◽  
Temporal And Spatial

Vallee et al. (1992) remark on the sensitivity of airborne ratio measuring VLF instruments to platform attitude stability. The authors also remind the users of VLF total field amplitude data, as produced by instruments such as the Herz TOTEM, of two problems associated with this type of data: spatial and temporal fluctuations of the VLF primary field. They recommend the use of a dense network of VLF monitoring stations and numerical modeling of field propagation to cope with these problems. These two recommendations are briefly discussed here and one alternative recommendation is made.

Average Q and yield estimates from the Pahute Mesa test site

1987 ◽  
Vol 77 (4) ◽  
pp. 1274-1294
Author(s):  
R. W. Burger ◽  
T. Lay ◽  
L. J. Burdick
Keyword(s):  
Time Domain ◽  
Near Field ◽  
Energy Levels ◽  
Source Model ◽  
Spectral Shape ◽  
Field Amplitude ◽  
Far Field ◽  
Source Models ◽  
Attenuation Models ◽  
Shape Data

Abstract Attenuation models, with and without frequency dependence, have been developed through analysis of time-domain amplitude measurements and teleseismic spectral shape data from Pahute Mesa nuclear explosions. The time-domain analysis is based on a near-field to far-field amplitude comparison. The near-field amplitude information is incorporated in two parameterized explosion source models (Mueller-Murphy and Helmberger-Hadley) based on analyses of near-field data. The teleseismic amplitude observations are from a large data set of WWSSN short-period analog recordings. For the narrow-band time-domain data, the various source and attenuation models are indistinguishable. We utilize the spectral shape data in the 0.5- to 4-Hz band as a constraint on the source-attenuation models at higher frequencies, concluding that either source model, when convolved with the appropriate frequency-dependent Q model, can be consistent with both the near-field and far-field time-domain amplitudes and the spectral shape data. Given the trade-off between source and attenuation models and the similarity of the different source models in the 0.5- to 4-Hz band, it is difficult to prefer clearly one source model over the other. The Mueller-Murphy model is more consistent with surface wave amplitude measurements because of larger predicted long-period energy levels. Whether or not frequency dependence is included in the attenuation model, the value of t* near 1 Hz is about 1.0 sec (assuming the Mueller-Murphy source model) or 0.8 sec (assuming the Helmberger-Hadley source model). This 0.2 sec difference results from greater 1-Hz energy levels for the Mueller-Murphy source model. Adopting an average attenuation model, predicted amplitudes and yields are shown to be within the uncertainty of the data for all the events analyzed.

Suppression Approaches of Far-Field Radiated Emission Using Common-Mode Inductor

2021 ◽  
Vol 1 (2) ◽  
pp. 1-5
Author(s):  
Mengzi Li ◽  
◽  
Shishan Wang ◽  
Jian Guo
Keyword(s):  
High Frequency ◽  
Reference Value ◽  
Power Converter ◽  
Practical Significance ◽  
Far Field ◽  
Common Mode ◽  
Suppression Method ◽  
Switching Mode ◽  
Emc Design ◽  
Radiated Emission

The miniaturization and integration of Switching Mode Power Supply (SMPS) is increasing, making it more complicated to analyze and predict its far-field radiated emission, and, consequently, studying the suppression method of far-field radiated emission of SMPS is of practical significance and engineering value. In this paper, a high-frequency SMPS is selected as the research object, whose far-field radiated emission is measured under the condition of three typical suppression methods. The experimental results verified the effectiveness of common-mode inductor and are of reference value for EMC design of power converter. Keywords: SMPS; EMC; Far-field Radiated Emission;

scholarly journals AN HYBRID MODEL FOR THE EVALUATION OF THE FULL-WAVE FAR-FIELD RADIATED EMISSION FROM PCB TRACES

2010 ◽  
Vol 101 ◽  
pp. 125-138 ◽  
Author(s):  
Andrea Gaetano Chiariello ◽  
Giovanni Miano ◽  
Antonio Maffucci
Keyword(s):  
Hybrid Model ◽  
Far Field ◽  
Full Wave ◽  
Radiated Emission

The low frequency scalar diffraction by an elliptic disc

1967 ◽  
Vol 63 (4) ◽  
pp. 1273-1280 ◽  
Author(s):  
B. D. Sleeman
Keyword(s):  
Plane Wave ◽  
Cross Section ◽  
Scattered Field ◽  
Low Frequency ◽  
Field Amplitude ◽  
Wave Number ◽  
Series Expansions ◽  
Far Field ◽  
Scalar Diffraction ◽  
Scattering Cross

SummaryThe problem of scalar Dirichlet diffraction of a plane wave by an elliptic disc is discussed. A scheme is given whereby the low frequency expansion of the scattered field may be readily obtained. Series expansions are obtained for the far-field amplitude up to and including the second order in the wave number. The first two terms of the scattering cross-section are also derived.

Far-field pattern determination from the near-field amplitude on two surfaces

1990 ◽  
Vol 38 (11) ◽  
pp. 1772-1779 ◽  
Author(s):  
O.M. Bucci ◽  
G. D'Elia ◽  
G. Leone ◽  
R. Pierri
Keyword(s):  
Near Field ◽  
Field Amplitude ◽  
Field Pattern ◽  
Far Field ◽  
Pattern Determination ◽  
Far Field Pattern

Reflector distortions diagnosis from far-field amplitude pattern

1995 ◽  
Vol 43 (11) ◽  
pp. 1217-1225 ◽  
Author(s):  
O.M. Bucci ◽  
G. D'Elia ◽  
G. Romito
Keyword(s):  
Field Amplitude ◽  
Far Field ◽  
Amplitude Pattern
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