MAGNETIC BODY DETECTOR

• Main Authors: MASUBUCHI SHINICHI, UCHIDA HIROSHI
• Format: Patent
• Language: English
• Published: 21.01.2010
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To provide a magnetic body detector as a means for warning that a magnetic body enters into a room where a strong magnet, such as an MRI diagnostic system, is installed, wherein a magnetic sensor can detect even a small magnetic body without being saturated even in an environment with strong magnetic flux density; and appropriate notification is provided to a user by arithmetic processing for inhibiting the detected value of a magnetic body that does not pass through a gate. [Means for Solving the Problem] By adjusting a solid angle formed with a detection axis of the magnetic sensor and a vertical axis or a horizontal axis to be within 15 degrees, a strong direct-current magnetic flux density to be applied to the detection axis is reduced; a small change in magnetic flux density due to the entry of a small magnetic body is detectable without saturation; the characteristics of a magnetic body that will not pass through the gate is extracted by the magnetic sensors arranged in the front, rear, left and right of the gate; and only a magnetic body in the vicinity that passes through the gate is regarded as a target for detection by inhibiting magnetic bodies that will not pass through the gate by calculation.