The Secret World of Magnets by Howard Johnson

Author:Howard Johnson [Johnson, Howard]
Language: eng
Format: epub
Tags: Science / Alternative
Published: 2012-02-11T21:13:59+00:00

THE MAPPING OF MAGNETIC FIELDS

To map a magnet's field the sensor must be moved between readings in a regular pattern.

Two servomotors advance the Hall Effect sensor after each reading is taken to collect the 6000 needed data points.

To map a 3" X 7" area, taking readings every 0.1", requires over 2000 readings. This must be done three times to measure the X, Y, and Z components of the magnet's fields.

Each component is unique. X, Y, and Z can be looked at seperately, or combined as "magni-tude," the square root of the sum of the squares of X, Y, and Z.

Topographic maps can be made of these magnetic fields, just as they can be made to show land contours.

Of particular interest arc the null lines where the field changes sign or direction.

Complex assemblies of magnets can be designed to shield, focus, and distort magnetic fields for various purposes.

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