The system was used to measure stainless steel particles of different sizes passing through the sensing area. The magnetic field sensitivity was measured to be 16 fT/Hz1/2 in the white noise regime above 2 Hz.
The gradiometer was mounted in a liquid-helium dewar (450-mm diameter 975-mm length), with a gap of 12 mm between the pickup coil and the dewar-tail surface. Kandori, Akihiko Ogata, Kuniomi Kawabata, Ryuzo Tanimoto, Sayaka Seki, YusukeĪ one-channel low temperature superconductor superconducting quantum interference device system comprising a second-order axial gradiometer with a sensing area of 10 mm Ã- 190 mm was developed. Note: Low temperature superconductor superconducting quantum interference device system with wide pickup coil for detecting small metallic particles Project supported by the National Natural Science Foundation of China (Grant Nos. The calculated values from the resulting model indicate good agreement with those from the finite element model (FEM) and experiments, which validates the developed analytical model. Afterwards, an analytical model for the case of a layered plate is established with the reflection and transmission theory of electromagnetic fields.
MOBIUS COIL NULL VECTOR WAVES DRIVER
The first step is to make a projection of MVP along the pickup coil onto a horizontal plane, and the second one is to build the relationship between the projected MVP and the MVP along the driver coil. Basically, the core of the formulation is to obtain the projection of magnetic vector potential (MVP) from the driver coil onto the vector along the tilted pickup coil, which is divided into two key steps. In this work, a tilted non-coaxial driver- pickup probe above a multilayered conducting plate is analytically modeled with spatial transformation for eddy current nondestructive evaluation. It is frequently observed in an eddy current (EC) array probe. Analytical model of tilted driver– pickup coils for eddy current nondestructive evaluationĬao, Bing-Hua Li, Chao Fan, Meng-Bao Ye, Bo Tian, Gui-YunĪ driver- pickup probe possesses better sensitivity and flexibility due to individual optimization of a coil.
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