In this paper, we designed a new detecting system of bridge cables with a snake-shaped robot. It can solve the problems such as inefficiency and danger of aloft work in the bridge detecting by workers. The detecting system of the bridge cables includes: a snake-shaped robot; a multiple and monocular vision detection module; a nondestructive magnetic leakage detecting module; a magnetostrictive ...

ANALYTICAL models at recent years are developed to determine surface-breaking defects along the applied field when using the magnetic flux leakage (MFL) non-destructive technique. The theoretical model fits the experimental MFL results from simulated defects. For MFL sensors, the normal magnetic leakage field is subsequently used for evaluation of defects. Permeability variations were neglected...

The same fundamental propagation and diffusion processes that establish current in conductors are also involved in establishing flux on the surface of magnetic cores and laminations but the spatial positions of the E and H fields are interchanged in the insulating medium. The E fields appear around the magnetic cores when the flux changes (∫Edl = dφ/dt), and the H fields are normal to idealized...

This topic reveals, by means of magnetic field plots, many of the problems that occur in magnetic device structures, utilizing both conventional cores and planar cores. The understanding gained from field plots points the way to reducing leakage inductance and winding losses that can otherwise be prohibitive. The reader is referred to the Unitrode/TI Magnetics Design Handbook TI Literature No. ...

THIS paper presents a new approach for detection of oil-gas pipeline corrosion defects in which pipeline magnetic flux leakage (MFL) detection system is adopted. To test the new approach, some artificial defects are simulated mathematically on the surface of oil-gas pipes to simulate different defects happening in practice. The interference eliminating method is introduced for compensation of d...

We analyze a time sequence of He II 256.32 Å images obtained with EIS/Hinode, sampling a small magnetic loop in magnetic network. Wavelet analysis indicates 11-min periodicity close to the loop apex. We interprete this oscillation as forcing through upward leakage by the fundamental acoustic eigenmode of the underlying field-free cavity. The observed loop length corresponds to the value predict...

Aims. This paper aims to look at the propagation of synthetic photospheric oscillations from a point source into a two-dimensional non-magnetic solar atmosphere. It takes a particular interest in the leakage of 5-min global oscillations into the atmosphere, and aims to complement efforts on the driving of chromospheric dynamics (e.g. spicules and waves) by 5-min oscillations. Methods. A model s...