| 摘要 |
PURPOSE:To make it possible to simultaneously measure magnetic characteristics such as iron loss, a crystal particle size and internal strain of the same region of a material to be measured by a single apparatus, by separately taking out a low frequency component and a high frequency component to perform signal processing. CONSTITUTION:A steel plate 1 receives AC magnetization in the longitudinal direction when passes through exciting coils 2, 3 and a signal is detected by a detection coil 4. A low band-pass filter 8 and a high band-pass filter 12 are connected to the output side of an attenuator 6 and the output signal of the low band-pass filter 8 is imparted to the voltage terminal of a wattmeter 10 and power loss is detected from an exciting current signal and the voltage signal from an amplifier 9 by the wattmeter 10 and the detection value is applied to an iron loss calculation circuit 11. The high band-pass filter 12 mainly takes out Barkhausen noise and a voltage level BV is monitored to be applied to an operator 17. The relational equation between the number of pulses of Barkhausen noise and a particle size number is set to the operator 17 and a crystal particle size is measured on the basis of an input signal and the relational equation is measured and the measured value is recorded on a recorder 16.
|
