On the propagation of a pulse through an antipode

1969 ◽  
Vol 47 (12) ◽  
pp. 1327-1330 ◽  
Author(s):  
James R. Wait
Keyword(s):  
Time Domain ◽  
Pulse Shape ◽  
Dipole Source ◽  
Transient Field ◽  
Idealized Model ◽  
Time Domain Response ◽  
The Time Domain ◽  
Strong Distortion

The time domain response of the fields in the vicinity of an axial caustic is calculated. The idealized model is a spherical concentric cavity with perfectly conducting walls. It is shown that the transient field, in the vicinity of the antipode of a dipole source, exhibits a strong distortion in the pulse shape.

scholarly journals Megasource time-domain electromagnetic sounding at Poggi del Sasso - Cinigiano (GR)

1994 ◽  
Vol 37 (5 Sup.) ◽  
Author(s):  
G. V. Keller ◽  
P. Cantini ◽  
R. Carrara ◽  
O. Faggioni ◽  
E. Pinna
Keyword(s):  
Depth Profile ◽  
Time Domain ◽  
Environmental Conditions ◽  
Dipole Source ◽  
Electromagnetic Noise ◽  
Electromagnetic Sounding ◽  
Piecewise Constant ◽  
Time Domain Electromagnetic ◽  
The Time Domain ◽  
Single Set

An experiment was carried out in the vicinity of the “I Terzi” area in Southeastern Tuscany (fig. 1) to evaluate the applicability of the Time Domain Electromagnetic (TDEM) sounding method under the geological and environmental conditions prevailing in that area. An electromagnetic source was established using a motor-generator set and heavy cable. Measurements were attempted at four sites. Numerous samples of electromagnetic noise were recorded at each of these sites. At one site, signals transmitted for a grounded dipole source at 1.6 km distance were also recorded with the noise. The single set of observations has been processed and inverted to yield a six-layer piecewise constant resistivity depth-profile to a depth of about 2 km. The primary achievement of the experiment was demonstration of the praeticability of TDEM methods under the conditions prevailing in the site.

Improving the time domain response of fractional order digital differentiators by windowing

2015 ◽  
Vol 107 ◽  
pp. 282-289 ◽  
Author(s):  
Chengyan Peng ◽  
Xiaochuan Ma ◽  
Geping Lin ◽  
Min Wang
Keyword(s):  
Fractional Order ◽  
Time Domain ◽  
Time Domain Response ◽  
The Time Domain

Coherent backscattering of a picosecond pulse from a disordered medium: Analysis of the pulse shape in the time domain

1989 ◽  
Vol 39 (7) ◽  
pp. 3728-3731 ◽  
Author(s):  
K. M. Yoo ◽  
K. Arya ◽  
G. C. Tang ◽  
Joseph L. Birman ◽  
R. R. Alfano
Keyword(s):  
Time Domain ◽  
Pulse Shape ◽  
Picosecond Pulse ◽  
Coherent Backscattering ◽  
The Time Domain ◽  
Disordered Medium

scholarly journals Scattering of an Impact Wave by a Crack in a Composite Plate

1992 ◽  
Vol 59 (3) ◽  
pp. 596-603 ◽  
Author(s):  
S. K. Datta ◽  
T. H. Ju ◽  
A. H. Shah
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Impact Load ◽  
Near Field ◽  
Boundary Integral ◽  
Transition Elements ◽  
Element Discretization ◽  
Crack Tips ◽  
Time Domain Response ◽  
The Time Domain

The surface responses due to impact load on an infinite uniaxial graphite/epoxy plate containing a horizontal crack is investigated both in time and frequency domain by using a hybrid method combining the finite element discretization of the near-field with boundary integral representation of the field outside a contour completely enclosing the crack. This combined method leads to a set of linear unsymmetric complex matrix equations, which are solved to obtain the response in the frequency domain by biconjugate gradient method. The time-domain response is then obtained by using an FFT. In order to capture the time-domain characteristics accurately, high-order finite elements have been used. Also, both the six-node singular elements and eight-node transition elements are used around the crack tips to model the crack-tip singularity. From the numerical results for surface responses it seems possible to clearly identify both the depth and length of this crack.

Improved analysis of the time domain response of scanning force microscope cantilevers

2000 ◽  
Vol 88 (12) ◽  
pp. 7321-7327 ◽  
Author(s):  
Brian A. Todd ◽  
Steven J. Eppell ◽  
Fredy R. Zypman
Keyword(s):  
Time Domain ◽  
Scanning Force Microscope ◽  
Scanning Force ◽  
Time Domain Response ◽  
The Time Domain

scholarly journals Introduction to the method of estimating time-domain response based on amplitude-frequency characteristics

2021 ◽  
Vol 2087 (1) ◽  
pp. 012061
Author(s):  
Mingrui Wang ◽  
Mei Xu ◽  
Jiangfeng Wang ◽  
Yingying Guo
Keyword(s):  
Research And Development ◽  
Time Domain ◽  
Electromagnetic Pulse ◽  
Parametric Modeling ◽  
Frequency Characteristics ◽  
Practical Applications ◽  
Time Domain Response ◽  
The Time Domain ◽  
Non Parametric

Abstract How to use the amplitude-frequency characteristics to reconstruct the signal to obtain the time-domain response has always been a concern in the field of nuclear electromagnetic protection. So far, in practical applications, parametric modeling and non-parametric modeling have been used to solve related problems. This article summarizes the research and development of using amplitude-frequency characteristics to recover time-domain signals in the field of nuclear electromagnetic pulse protection, and briefly introduces the shortcomings of the two methods in combination with specific experiments.

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