HIGH SENSITIVE MAGNETIC INDUCTION DEVICE

摘要

PURPOSE: A high sensitive magnetic induction device is provided which can sense a movement of Fe with a high sensitivity using a method of sensing that a peculiar flux of an earth is converted into the movement of Fe. CONSTITUTION: A searching coil(1) is assembled by arranging three single bodies wound with a copper coil coated with an enamel in each independent core in a reverse direction each other. A driver(2) operates an amplifier(4) to amplify an output signal. A band pass filter(3) passes frequencies in a preestablished band among signals being output by the searching coil and attenuates the other upper and lower frequencies. The amplifier amplifies the output signal lowered due to an operation power of the ban pass filter upto a fixed level. An attenuator(5) is designed to give an undistorted attenuation as to the output signal from the amplifier. A driving part(6) makes a user to recognize that a magnetic property of Fe is measured by outputting an output signal from the attenuator to a magnetic induction measurement device held by the user. And a power supply(7) maintains a constant voltage to supply an operation power of the device.