Author
S. Thirunavukkarasu
Bio: S. Thirunavukkarasu is an academic researcher from Indira Gandhi Centre for Atomic Research. The author has contributed to research in topics: Eddy current & Magnetic flux leakage. The author has an hindex of 9, co-authored 26 publications receiving 216 citations.
Papers
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TL;DR: Design and development of a flexible GMR sensor array for nondestructive detection of service-induced defects on the outer surface of 64 mm diameter steel track rope and studies reveal that the sensor array can reliably detect both LF and LMA type defects in the track rope.
Abstract: This paper presents design and development of a flexible GMR sensor array for nondestructive detection of service-induced defects on the outer surface of 64 mm diameter steel track rope. The number of GMR elements and their locations within saddle-type magnetizing coils are optimized using a three dimensional finite element model. The performance of the sensor array has been evaluated by measuring the axial component of leakage flux from localized flaw (LF) and loss of metallic cross-sectional area (LMA) type defects introduced on the track rope. Studies reveal that the GMR sensor array can reliably detect both LF and LMA type defects in the track rope. The sensor array has a fast detection speed along the length of the track rope and does not require circumferential scanning. It is also possible to image defects using the array sensor for obtaining their spatial information.
44 citations
TL;DR: In this paper, an attempt was made to demonstrate the use of electrochemical noise (EN) technique in assessment of intergranular corrosion (IGC) in 316(N) stainless steel (SS).
42 citations
TL;DR: In this paper, the performance of different types of air core, ferrite core, and cup-core probes has been analyzed and compared using finite element modeling, and the model predicted results have indicated that the cup core probe ensures better sensitivity for detection of deep sub-surface defects.
Abstract: Studies on design optimisation of eddy current probe have been carried out for detection of deep sub-surface defects in thick stainless steel plates. The performance of send–receive type air core, ferrite core, ferrite core with outer shielding, and cup-core probes has been analysed and compared using finite element modelling. The model predicted results have indicated that the cup-core probe ensures better sensitivity for detection of deep sub-surface defects. For experimental studies, a high sensitive eddy current instrument with digital lock-in amplifier functionality implemented in LabVIEW software has been developed. Experimental results have confirmed that cup-core probe is capable of detecting defects located at 8.0 mm below the surface in 12.0 mm thick stainless steel plates as well as simulated sub-surface localised corrosions. A linear relationship between phase angle and defect depth below the surface has been observed, apart from discrimination of sub-surface and surface defects.
20 citations
TL;DR: In this paper, Fourier filtering, cross-correlation and wavelet transform techniques have been studied for noise reduction as well as enhancement of RFEC signals of defects in bend regions, having machined grooves and localized defects.
20 citations
TL;DR: In this article, the pitting corrosion resistance of Alloy B and Alloy D with and without boron addition with minor changes in the trace element concentrations was studied for 0.001 m, 0.01 m and 0.1 m sodium chloride solutions using electrochemical noise (EN) technique.
19 citations
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TL;DR: In this paper, the effect of initial pH and temperature of iron salt solutions on formation of magnetite (Fe3O4) nanoparticles during co-precipitation was reported.
287 citations
TL;DR: The main principles, measurement and processing of MFL data, the identification of the leakage magnetic signal is discussed, and future developments in pipeline MFL detection are predicted.
Abstract: Magnetic flux leakage (MFL) detection is one of the most popular methods of pipeline inspection. It is a nondestructive testing technique which uses magnetic sensitive sensors to detect the magnetic leakage field of defects on both the internal and external surfaces of pipelines. This paper introduces the main principles, measurement and processing of MFL data. As the key point of a quantitative analysis of MFL detection, the identification of the leakage magnetic signal is also discussed. In addition, the advantages and disadvantages of different identification methods are analyzed. Then the paper briefly introduces the expert systems used. At the end of this paper, future developments in pipeline MFL detection are predicted.
227 citations
TL;DR: In this paper, the effect of grain size on chromium carbide precipitation and sensitization of 316L stainless steel was investigated based on inspection of microstructures and electrochemical potentiokinetic reactivation test.
105 citations
TL;DR: In this paper, the correlation between parameters and corrosion forms is discussed, and other in situ techniques are recommended to be employed synchronously with EN measurement in order to obtain reliable analyses.
Abstract: Electrochemical noise (EN), as one of the most promising in situ electrochemical methods in corrosion and electrochemical science, has been developing rapidly in recent years with the advancements in instrumentation and signal processing methods. One advantage of EN is its application in long-term or early stage corrosion process monitoring because it instantly detects corrosion rate and corrosion forms. Investigators have applied various mathematical methods to extract characteristic parameters from EN. In this paper, identifying corrosion forms using parameters obtained from time domain, frequency domain and time–frequency domain is reviewed, and the correlation between parameters and corrosion forms is discussed. Finally, other in situ techniques are recommended to be employed synchronously with EN measurement in order to obtain reliable analyses.
92 citations