| 摘要 |
PURPOSE:To increase the output with regard to unit current, by using one constant current power source in the output circuit, thereby detecting the change in magnetic field efficiently. CONSTITUTION:A series circuit of magnetic resistance element S1 and S2 is connected to the constant current power source, and a current (i) always flows. When a rotary magnetic field is generated by the movement of a probe, the voltages generated across the element S1 and S2 are detected by differential amplifiers 2 and 3. The amplifier 2 outputs V1=i(R0-DELTAR), and the amplifier 3 outputs V2=i(R0-DELTAR). The outputs are made to be the output V=V2-V1= 2iDELTAR(2iDELTARsintheta) by the operation of a differential amplifier 4. |
