Data Acquisition and Processing of Weak Low-Frequency Magnetic Signals

2011 ◽  
Vol 65 ◽  
pp. 299-302 ◽  
Author(s):  
Shou Qiang Men ◽  
Christian Resagk
Keyword(s):  
Magnetic Field ◽  
Data Acquisition ◽  
Fourier Transforms ◽  
Low Frequency ◽  
Fast Fourier Transforms ◽  
Two Dimensional ◽  
Calibration System ◽  
Magnetic Field Sensors ◽  
Data Acquisition And Processing

A simple calibration system for magnetic field sensors was designed, and experiments were carried out to calibrate two-dimensional fluxgate sensors and a sensor ring composed of eight fluxgate sensors. Fast Fourier Transforms and trapezoidal numerical integrals were applied to deal with the raw signals. It is found that it is not suitable to apply fast Fourier Transforms only to deal with signals with several peaks close to each other, but trapezoidal numerical integrals should also be used in combination with the FFT method.

Large voltage modulation in magnetic field sensors from two-dimensional arrays of Y-Ba-Cu-O nano Josephson junctions

2014 ◽  
Vol 104 (6) ◽  
pp. 062601 ◽  
Author(s):  
Shane A. Cybart ◽  
E. Y. Cho ◽  
T. J. Wong ◽  
V. N. Glyantsev ◽  
J. U. Huh ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Josephson Junctions ◽  
Two Dimensional ◽  
Magnetic Field Sensors

A New Pulsed Nuclear Quadrupole Resonance Spectrometer

1994 ◽  
Vol 49 (1-2) ◽  
pp. 65-70 ◽  
Author(s):  
G. L. Petersen ◽  
P. J. Bray ◽  
R. A. Marino
Keyword(s):  
Data Acquisition ◽  
Nuclear Quadrupole Resonance ◽  
Fourier Transforms ◽  
Fast Fourier Transforms ◽  
Matching Network ◽  
Quadrupole Resonance ◽  
Wide Line ◽  
Line Widths ◽  
Nuclear Quadrupole

Abstract A new pulsed nuclear quadrupole resonance spectrometer is described and a number of Nitrogen-14 spectra are shown and discussed. The spectrometer is computer interfaced and both data acquisition and all adjustments other than the matching network tuning are automatic. Spectra may be produced using fast Fourier transforms or by the Clark Method. The latter is particularly valuable when very wide line widths are encountered.

Two‐dimensional electron gas magnetic field sensors

1990 ◽  
Vol 57 (3) ◽  
pp. 291-293 ◽  
Author(s):  
J. Heremans ◽  
D. L. Partin ◽  
D. T. Morelli ◽  
B. K. Fuller ◽  
C. M. Thrush
Keyword(s):  
Magnetic Field ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Magnetic Field Sensors ◽  
Dimensional Electron Gas

The Application Research on Three-Dimensional GPR Image Used in Grouting Effect Evaluation of Subgrade Void

2014 ◽  
Vol 1065-1069 ◽  
pp. 725-732
Author(s):  
Yong Qing Yang
Keyword(s):  
Data Acquisition ◽  
Three Dimensional ◽  
Highway Bridge ◽  
Two Dimensional ◽  
Effect Evaluation ◽  
Application Research ◽  
Three Dimensional Images ◽  
Data Acquisition And Processing

On the basis of the GPR method principle, data acquisition and processing, this paper mainly discusses two-dimensional GPR profiles and three-dimensional GPR images through GPR detection example about the voids of highway bridge head subgrade and the grouting distribution. Three-dimensional images accurately and directly evaluate the grouting effect. Thus it illustrates that GPR used to detect the voids of highway bridge head roadbed and the grouting distribution is an effective method.

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