Patent ID: 11946986
Assignee: FUJIDENOLO CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. A detection method for estimating a distance between a magnetic body moving in a first direction among the first direction, a second direction, and a third direction and at least one of a first magnetic sensor and a second magnetic sensor, using the first magnetic sensor and the second magnetic sensor, the first direction being a specific direction, the second direction and the third direction intersecting the first direction, and the second magnetic sensor being disposed in close proximity to or integrated with the first magnetic sensor, wherein
the first magnetic sensor is configured to measure a first magnetic field component, the first magnetic field component being a component of the first direction of a magnetic field,
the second magnetic sensor is configured to measure a possible magnetic field component including at least one of a second magnetic field component or a third magnetic field component, the second magnetic field component being a component of the second direction of the magnetic field, and the third magnetic field component being a component of the third direction of the magnetic field, and
the detection method comprises:
a closest proximity detection step of detecting a timing at which the magnetic body passes a closest proximity position, the closest proximity position being a position of the magnetic body when the magnetic body moving in the first direction is in closest proximity to the first magnetic sensor;
a closest proximity position component acquisition step of acquiring the first magnetic field component measured by the first magnetic sensor at the timing and the possible magnetic field component measured by the second magnetic sensor;
a predetermined position component acquisition step of acquiring the first magnetic field component measured by the first magnetic sensor when the magnetic body is at a predetermined position separated by a predetermined distance from the first magnetic sensor;
a distance estimation step of estimating a third direction distance based on the first magnetic field component acquired by each of the closest proximity position component acquisition step and the predetermined position component acquisition step, the third direction distance being a distance between the magnetic body and the first magnetic sensor in the third direction; and
a magnetic moment amount estimation step of estimating a magnitude of the magnetic moment, based on the third direction distance estimated by the distance estimation step, and on at least one of the first magnetic field component or the possible magnetic field component acquired by the closest proximity position component acquisition step.