| 摘要 |
PURPOSE: A magnetostrictive electro magnetic acoustic apparatus for measuring real-time lankfold value is provided to significantly reduce noise. CONSTITUTION: An apparatus comprises an electro magnetic acoustic transducer(32) having transducers(30,31), and an electro magnetic acoustic transducer(35) having transducers(33,34) arranged in an upper rolling direction(90 degree) and width-wise direction(0 degree) of a cold-rolled coil(1), respectively; an electro magnetic acoustic transducer(38) having transducers(36,37) disposed in the lower central direction(45 degree) of the cold-rolled coil; Meander coils(39,40) arranged beneath the cold-rolled coil so as to correspond to electro magnetic acoustic transducers(32,35); a Meander coil(41) arranged on the cold-rolled coil so as to correspond to the electro magnetic acoustic transducer(38); and a bandpass filter(42) connected to a receive signal amplifier(43) and to the output side of transducers(31,34,37). Transducers and cold-rolled coil are grounded.
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