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    • 6. 发明专利
    • CONTINUOUS CROSS-SECTION INSPECTION APPARATUS OF LONG MAGNETIC SUBSTANCE
    • JPH07181166A
    • 1995-07-21
    • JP32742893
    • 1993-12-24
    • SEKITAN GIJUTSU KENKYUSHOMITSUI MIIKE MACHINERY CO LTDSATO KOJITSUKADA KAZUHIKO
    • SATO KOJITSUKADA KAZUHIKOYAMADA RYUJI
    • G01N27/83
    • PURPOSE:To obtain the continuous cross-section inspection apparatus, of a long magnetic substance, which can evaluate the state, the cause and the like of damage accurately and which can inspect the comprehensive degradation of the long magnetic substance by a method wherein a gentle change in the cross section along the length direction of the long magnetic substance and a local sudden change in its cross section can be detected simultaneously and in a noncontact state and the changes are displayed so as to correspond to each other. CONSTITUTION:The continuous cross-section inspection apparatus of a long magnetic substance is obtained in such a way that a magnetic-flux detection device wherein a magnetizer 11 which magnetizes the long magnetic substance 1 strongly and uniformly in the length direction up to a nearly saturated state, a search coil 13a which detects a change in the internal magnetic-flux amount of the magnetized long magnetic substance 1, a leakage flux sensor 13b which detects the leakage flux amount of the magnetized long magnetic substance 1, an integrator 14 which integrates the induced electromotive force of the search coil 13a and which obtains an output proportional to a change in the cross-sectional area of the long magnetic substance 1 and an amplifier 15 which amplifies the detection voltage of the leakage flux sensor 13b have been integrated is arranged so as to be capable of being moved relatively to the length direction with reference to the long magnetic substance 1.