Design of a flexible eddy current probe in view of the evaluation of the electrical conductivity during inspection of defects

2016 ◽  
Vol 32 (3) ◽  
pp. 227-241 ◽  
Author(s):  
Benjamin Delabre ◽  
Jean-Marc Decitre ◽  
Yann Le Bihan
Keyword(s):  
Electrical Conductivity ◽  
Eddy Current

Localization and Recognition of Different Vertebra Tissues Based on Eddy Current Detection Method

2013 ◽  
Vol 740 ◽  
pp. 128-133 ◽  
Author(s):  
Wei Wen Liu ◽  
Kai Jiang ◽  
Hui Zhao ◽  
Cheng Long Wang
Keyword(s):  
Electrical Conductivity ◽  
Internal Fixation ◽  
Eddy Current ◽  
Biological Tissue ◽  
Detection Method ◽  
Pedicle Screws ◽  
Human Beings ◽  
High Penetration ◽  
Trauma Injury ◽  
Current Detection

The spine, which is throughout the trunk, is of great importance to the skeleton structure of human beings. For spine is vulnerable, the rate of spine incident trauma injury is relatively high. In the contemporary technology, the internal fixation prosthetics with implanting pedicle screws is the most efficient way in clinical treatment. However spine internal fixation surgery has many disadvantages like complex in the operation, the high penetration rate and inability to be used in the field battle. As a result, according to the magnetic property difference of different vertebra tissues, an eddy current detection method which is used in localization and recognition of different vertebra tissues to realize the navigation of spine internal fixation surgery is proposed in this paper. A set of improved series-reverse-three coils eddy current sensor is used to test the NaCl solution which electrical conductivity matches that of biological tissue. And the result of several experiments indicates this method can detect the biological tissue with the electrical conductivity no less than 0.5 S/m, which lays a solid foundation to further study of recognition different vertebra tissues.

Non-Destructive Evaluation of Creep Damage in a Nickel Base Super-Alloy Turbine Bucket

2009 ◽  
Author(s):  
Hector Carreon
Keyword(s):  
Electrical Conductivity ◽  
Eddy Current ◽  
Elevated Temperatures ◽  
Damage Zone ◽  
Creep Damage ◽  
Turbine Engine ◽  
Turbine Component ◽  
Nickel Base ◽  
Turbine Bucket ◽  
Super Alloy

Due to elevated temperatures, excessive stresses and severed corrosion conditions, turbine engine components are subject to creep processes that limit the components life such as a turbine bucket. The failure mechanism of a turbine bucket is related primarily to creep and corrosion and secondarily to thermal fatigue. As a result, it is desirable to assess the current condition of such turbine component. This study uses the eddy current (EC) nondestructive evaluation technique in an effort to monitor the creep damage in a nickel base super-alloy, 7FA stage 2 turbine bucket after service. The experimental results show significative electrical conductivity variations in eddy current images on the creep damage zone of nickel base super-alloy samples cut from a turbine bucket. Thermoelectric power (TEP) measurements were also conducted in order to obtain a direct correlation between the presence of material changes due to creep damage and the electrical conductivity measurements.

Evaluation of Piezoresistivity in Heat Treated 5A06 Al-Mg alloy Due to Applied Stress Using Eddy Current Method

2012 ◽  
Vol 548 ◽  
pp. 377-381
Author(s):  
Shakoor Abdul ◽  
Zheng Gan Zhou
Keyword(s):  
Electrical Conductivity ◽  
Eddy Current ◽  
Tensile Load ◽  
Current Method ◽  
Thermal Exposure ◽  
Uniaxial Tensile ◽  
Eddy Current Method ◽  
Hall Effect Sensor ◽  
Heat Treated ◽  
Stress Coefficient

Eddy current method can be used for non-destructive assessment of residual stress. In order to relate electrical conductivity change to the residual stresses in the welded joints, piezoresistivity of 5A06 has been investigated using samples heat treated at 2500C and 4000C. These samples represent weld zones with different thermal exposure. A directional eddy current probe with a Hall Effect sensor was used to evaluate stress coefficient of electrical conductivity due to applied uniaxial tensile load on the samples. The electromagnetic forward model was solved using FEM package and linear conductivity inversion was formulated to express probe output in terms of electrical conductivity. The piezoresistivity coefficients of samples, calculated from the derivative of stress-conductivity relation, were compared. The results indicate that coefficients vary inversely with annealing temperature.

scholarly journals INDUCTIVE PARAMETRIC EDDY-CURRENT TRANSDUCER (IPEP) FOR MEASURING ELECTRICAL AND TEMPERATURE PARAMETERS OF WASTEWATER FROM BREWING PRODUCTION

2021 ◽  
pp. 26-33
Author(s):  
Vadim Sebko ◽  
Volodymyr Babenko ◽  
Yevheniia Pyrozhenko
Keyword(s):  
Electrical Conductivity ◽  
Eddy Current ◽  
Test Tube ◽  
Specific Electrical Conductivity ◽  
Wastewater Sample ◽  
Current Transducer ◽  
Differential Scheme ◽  
The Difference ◽  
Glass Test Tube ◽  
Eddy Current Transducer

The possibility of using the theory of operation of a differential inductive parametric  eddy-current transducer (IPET) for measuring the electrical and temperature parameters of a sample of acidic and alkaline wastewater is investigated. The need for the development of new informative methods for measuring the physicochemical parameters of wastewater is proved, in the realization of which a promising method of purification is selected. On the basis of a differential scheme for switching on two parametric converters: with exemplary purified water and a converter in which a test tube with a sample of waste water from a brewing production is placed, a differential informative method for measuring the electrical and temperature parameters of the liquid under study is proposed, which is based on the analysis of the components of the difference signal of phase shift angles measured electrical components of the switching circuit signals. The basic relationships that describe the operation of the IPET with the sample of the controlled liquid are given. The scheme of switching on differential IPET with a liquid sample, which is placed in a glass test tube, is considered; the differential scheme provides for heating the sample during measurements to simulate the production conditions of brewing production. Universal transformation functions are given that relate the components of the IPET signals with the specific electrical conductivity χt.s. and the temperature t of the wastewater sample from brewing production, that is, the dependence of the phase difference signal Δj on the generalized parameter A and the dependence of the absolute increment in the specific electrical conductivity Δχ on the temperature t of the wastewater sample, in the investigated temperature range.

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