| 摘要 |
PURPOSE:To measure a magnetic field with high sensitivity by deflecting a linear electron flow electromagnetically by a magnetic field to be measured and measuring the intensity of the magnetic field based on the difference between currents which flow to anode electrodes divided in the deflection direction. CONSTITUTION:The divided anode electrodes for sucking electron currents are provided at specific distance from the electron emission surface of an electron emitting element 1 and division electrodes 2 and 3 are constituted on the anode electrodes. If a magnetic field 8 with magnetic flux density B is present between the element 1 and electrodes 2 and 3, an electron flow 9 is deflected electromagnetically to cause a shift in the arrival position of the electron flow 9 toward the electrode 2 by deflection distance (h), and consequently a current I1 increases and a current I2 decreases. If the values of the currents I1 and I2 are proportional to the lengths of the electron flow 9 on the electrodes 2 and 3, the distance (h) is found from the difference between the currents I1 and I2 and an angle theta. Therefore, the magnetic flux density B is calculated from a prescribed expression. Thus, the magnetic field with high sensitivity is measured.
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