发明申请
US20050223801A1 Apparatus for generating and measuring bending vibration in a non-ferromagnetic pipe without physical contact 有权
用于在没有物理接触的情况下产生和测量非铁磁管中的弯曲振动的装置

Apparatus for generating and measuring bending vibration in a non-ferromagnetic pipe without physical contact
摘要:
Disclosed is an apparatus for generating and measuring bending vibration in a pipe buried underground or a pipe covered by insulating materials. There is provided an apparatus for generating and measuring bending vibration in a non-ferromagnetic pipe without physical contact, comprising: a ferromagnetic strip adhered on a surface of the pipe; a coil wound around the surface of the pipe; two magnets for generating bias magnetic field, applied to the strip and parallel to the strip; a power source for supplying an electric current to the coil; and a measuring unit for measuring variation of voltage across the coil, the variation of the voltage being generated due to a strain according to inverse magnetostrictive effect, the strain being generated due to bending vibration, the bending vibration being generated due to deformation of the strip, the deformation being induced according to magnetostrictive effect as the power source supplies the electric current to the coil.
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