Results 201 to 210 of about 6,038 (254)
Some of the next articles are maybe not open access.
Eddy Current Probe Identification and Analysis
IEEE Transactions on Instrumentation and Measurement, 2017This paper presents a new approach to the classical method for failure detection with eddy currents. In contrast to traditional methods of measuring reflected impedance on the probe circuit, this paper uses concepts of identification theory to find a transfer function that characterizes the dynamics of the measuring system by eddy currents.
Felipe A. Tondo +4 more
openaire +1 more source
Eddy-Current Reflection Probes: Theory and Experiment
Research in Nondestructive Evaluation, 1989A general ΔZ theory of reflection-type eddy-current probes was recently developed for new types of robotic proximity sensors. In this paper, the theory is applied to the characterization of surface-connected flaws. Flaw signals were calculated using a finite-difference implementation of the ΔZ theory developed at Stanford University. A special air-core
B. A. Auld +5 more
openaire +1 more source
RF shielding and eddy currents in NMR probes
Journal of Magnetic Resonance, 2019Shielding of the NMR sample by a thin coating of metal between the sample and the rf coil arises in some geometries. The shielding may be used for rf heating of the sample tube or for a high infrared reflectivity coating in cryoprobe applications. An important application is for a shield that prevents noise from entering the rf probe circuit while ...
Mark S, Conradi, Albert P, Zens
openaire +2 more sources
The eddy current probe as a holographic transducer
Journal of Nondestructive Evaluation, 1993Experimental work with the application of holography to eddy current imaging has previously been performed. This paper presents a theoretical analysis of the holographic imaging characteristics of the eddy current probe. A specially shaped probe design has been developed during this analysis for enhanced imaging performance.
B P Hildebrand, Hildebrand B P
exaly +2 more sources
1983
This paper describes theoretical and experimental work directed toward finding the optimum probe dimensions and operating frequency for eddy current detection of half-penny surface cracks in nonmagnetic conducting materials. The study applies to probes which excite an approximately uniform spatial field over the length of the crack at the surface of ...
Kincaid, Thomas, McCary, Richard
openaire +2 more sources
This paper describes theoretical and experimental work directed toward finding the optimum probe dimensions and operating frequency for eddy current detection of half-penny surface cracks in nonmagnetic conducting materials. The study applies to probes which excite an approximately uniform spatial field over the length of the crack at the surface of ...
Kincaid, Thomas, McCary, Richard
openaire +2 more sources
Deep Penetrating Eddy Currents and Probes
Materials Testing, 2007Abstract The eddy current skin-effect limits the detection of subsurface defects and the range of thickness measurement. Traditional concepts to estimate the penetration depth basing on plane wave propagation into a conducting halfspace cannot describe the real depth of inspection achievable by state-of-the-art sensors and instruments ...
Gerhard Mook +2 more
openaire +1 more source
Metamaterial-Core Probes for Nondestructive Eddy Current Testing
IEEE Transactions on Instrumentation and Measurement, 2021Eddy current testing (ECT) is one of the most important techniques in nondestructive evaluation. A higher probe sensitivity is always pursued in ECT. To improve the probe sensitivity, the near electrical resonance signal enhancement (NERSE) technique was recently proposed.
Zhi Gong, Shiyou Yang
openaire +1 more source
A Method for Comparing the Metrological Properties of Eddy Current Probes
IEEE Transactions on Instrumentation and Measurement, 2021This article describes a method for comparing the metrological properties of air-cored and solid-cored coils designed as eddy current probes. The approach suggested in this article assumes that a pair of equivalent parameters of an ideal filamentary coil can be assigned to any contact coil so that the impedance variations in both coils are identical ...
Leszek Dziczkowski, Grzegorz Tytko
openaire +1 more source