an omnidirectional 0 Modal lamb wave electromagnetic acoustic sensor
A sensor and electromagnetic acoustic technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, instruments, etc. To be improved and other issues, to achieve the effect of improving performance, realizing non-contact detection, and uniform magnetic field distribution
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[0026] The present invention will be further described below in conjunction with the accompanying drawings and examples, and the following examples are only descriptive and not restrictive, and cannot be used to limit the protection scope of the present invention.
[0027] Such as figure 1 , is the omnidirectional type A of the present invention 0 Schematic diagram of the structure of the modal Lamb wave electromagnetic acoustic sensor; including a cylindrical NdFeB magnet 1, a ring-shaped NdFeB magnet 2, a support sleeve 3, and a double-layer helical folded coil 4. Cylindrical NdFeB magnet 1 and ring-shaped NdFeB magnet 2 form a concentric pair of magnets, and the polarities at the same end are opposite, which can generate a static magnetic field uniformly distributed along the radial direction of the magnet. The double-layer helical folded coil 4 is placed at the bottom end of the pair of concentric magnets and is in close contact with it.
[0028] The cylindrical NdFeB ma...
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