Monitoring groundwater-surface water interaction using time-series and time-frequency analysis of transient three-dimensional electrical resistivity changes

2012 ◽  
Vol 48 (7) ◽  
Author(s):  
T. C. Johnson ◽  
L. D. Slater ◽  
D. Ntarlagiannis ◽  
F. D. Day-Lewis ◽  
M. Elwaseif
Keyword(s):  
Time Series ◽  
Electrical Resistivity ◽  
Surface Water ◽  
Frequency Analysis ◽  
Three Dimensional ◽  
Time Frequency Analysis ◽  
Time Frequency ◽  
Water Interaction ◽  
Groundwater Surface Water Interaction

scholarly journals A Fast Three-Dimensional Display Method for Time-Frequency Spectrogram Used in Embedded Fault Diagnosis Devices

2018 ◽  
Vol 8 (10) ◽  
pp. 1930 ◽  
Author(s):  
Lina Wang ◽  
Chengdong Wang ◽  
Yong Chen
Keyword(s):  
Fault Diagnosis ◽  
Frequency Analysis ◽  
Low Cost ◽  
Three Dimensional ◽  
Surface Generation ◽  
Depth Information ◽  
Time Frequency Analysis ◽  
Time Frequency ◽  
Mesh Surface ◽  
General Computer

Time-frequency analysis is usually used to reveal the appearance of different frequency components varying with time, in signals, of which time-frequency spectrogram is an important visual tool to display the information. The Mesh Surface Generation (MSG) algorithm is widely used in three-dimensional (3D) modeling. Removing hidden lines from the mesh plot is an essential process that produces explicit depth information. In this paper, a fast and effective method has been proposed for a time-frequency Spectrogram Mesh Surface Generation (SMSG) display, especially, based on the painter’s algorithm. In addition, most portable fault diagnosis devices have little function to generate a 3D spectrogram, which generally needs a general computer to realize the complex time-frequency analysis algorithms and a 3D display. However, general computer is not portable and then not suitable for field test. Hence, the proposed SMSG algorithm is applied to an embedded fault diagnosis device, which is light, low-cost, and real-time. The experimental results show that this approach can realize a high degree of accuracy and save considerable time.

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