Non-intrusive Internal Corrosion Characterization using the Potential Drop Technique for Electrical Mapping and Machine Learning

2021 ◽  
Author(s):  
George Pinto ◽  
Jorge Amaral ◽  
Gil R. V. Pinheiro ◽  
Victor G. Silva ◽  
José A. C. P. Gomes
Keyword(s):  
Machine Learning ◽  
Potential Drop ◽  
Internal Corrosion ◽  
Electrical Mapping ◽  
Drop Technique

scholarly journals A Non-Intrusive System to Classify the Severity of Damages Caused by Internal Corrosion Using the Potential Drop Technique and Electrical Image Mapping

2020 ◽  
Vol 15 (3) ◽  
pp. 1-7
Author(s):  
Jorge Amaral ◽  
George Leandro Dos Santos Pinto ◽  
Gil Roberto Vieira Pinheiro ◽  
Victor Gomes Silva ◽  
José Antônio Ponciano Gomes
Keyword(s):  
Image Processing ◽  
Morphological Analysis ◽  
Steel Plate ◽  
Potential Gradient ◽  
Potential Drop ◽  
Internal Corrosion ◽  
Image Mapping ◽  
Feature Extractor ◽  
Processing Techniques ◽  
Drop Technique

This work presents a non-intrusive method to obtain information about damages caused by internal corrosion in a stainless-steel plate and classify them according to their severity. The Potential Drop technique provides an electric potential gradient map, which is analyzed by the application of image processing techniques, such as morphological analysis and segmentation. Some corrosion forms can be detected by this method, like cracks and pitting corrosion; the last one is discussed in this paper. Finite Element Modeling simulations were performed to get examples of defective plates (with two classes of damages) The image processing in the simulations acts as a feature extractor that feeds a binary classifier based on Logistic Regression, which accuracy was 99.24%.

scholarly journals Measuring the depth of surface cracks using alternating current potential drop technique, with suppression of the influence of the electromagnetic properties of the metal

2021 ◽  
Vol 2091 (1) ◽  
pp. 012047
Author(s):  
P N Shkatov
Keyword(s):  
Crack Depth ◽  
Potential Drop ◽  
Alternating Current ◽  
Measurement Range ◽  
Electromagnetic Properties ◽  
Surface Cracks ◽  
Measuring Techniques ◽  
Drop Technique ◽  
Current Potential

Abstract Traditional measuring techniques often lead to errors due to the need to register signals in both defective and defect-free areas. In this paper, we introduce an alternating current potential drop technique with detuning from the influence of variations in the electromagnetic properties of the metal achieved by registering a signal only at the defective site. We show that, with an appropriate choice of measurement parameters, the use of the proposed technique leads to an increase in sensitivity to the crack depth as well as to an increase in the measurement range.

DC Potential Drop Technique Selecting Probes Distances Properly for Sizing Deep Surface Cracks

2005 ◽  
Author(s):  
Fumio Takeo ◽  
Masumi Saka ◽  
Seiichi Hamada ◽  
Manabu Hayakawa
Keyword(s):  
Power Plants ◽  
Potential Drop ◽  
Small Crack ◽  
Surface Cracks ◽  
Structural Components ◽  
Deep Surface ◽  
Close Proximity ◽  
Current Input ◽  
Quantitative Nde ◽  
Drop Technique

D-C potential drop (DCPD) technique is a powerful tool for quantitative NDE of cracks. The technique using four probes which are in close proximity to each other has been proposed for NDE of surface cracks; that is the closely coupled probes potential drop (CCPPD) technique. It has been shown that the sensitivity of CCPPD technique to evaluate a small crack is enhanced significantly in comparison with the usual method. On the other hand, since CCPPD technique has been developed to evaluate a small crack sensitively, it is not fit to evaluate deep cracks which are sometimes found in the structural components of power plants. The objective of this study was to enhance the sensitivity of evaluating deep surface cracks. By extending the distance between current input and output probes, the change in potential drop with the change in the depth of deeper crack becomes large. But the voltage of potential drop becomes small to measure, because the current density in the material becomes low. The voltage of the potential drop can be increased by increasing the applying current, but the current would also be limited by the equipment or contacting probes. Then the way to select the appropriate distances between probes from the viewpoints of the sensitivity and the required current has been shown.

dc Potential Drop Technique in Creep Stress Rupture Testing

JOM ◽  
1985 ◽  
Vol 37 (10) ◽  
pp. 44-49 ◽  
Author(s):  
Ioannis P. Vasatis ◽  
Regis M. Pelloux
Keyword(s):  
Stress Rupture ◽  
Potential Drop ◽  
Creep Stress ◽  
Dc Potential ◽  
Stress Rupture Testing ◽  
Drop Technique

POTENTIAL DROP TECHNIQUE FOR NONDESTRUCTIVE EVALUATION OF BIFURCATED CRACK IN RAIL

1993 ◽  
Vol 10 (6) ◽  
pp. 333-341 ◽  
Author(s):  
M. SAKA ◽  
D. YUASA ◽  
H. ABÉ ◽  
K. SUGINO ◽  
H. KAGEYAMA
Keyword(s):  
Nondestructive Evaluation ◽  
Potential Drop ◽  
Drop Technique
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