HELMHOLTZ COILS

	INTRODUCTION
	HELMHOLTZ PRINCIPLE
	MEASUREMENT COILS
	HELMHOLTZ CHAMBER
	POWER SUPPLIES

Helmholtz Principle

The principle of Helmholtz coils is very simple.

As you move away from coil (1) that is generating a magnetic field, the field will decrease with distance. By introducing a second coil (2), a distance from the first one, when you move away from coil (1) in the direction of the second coil the field strength from coil (1) will decrease but the field strength from coil (2) will increase.

As they are positioned at present a region is formed where the effects of moving away from one coil is exactly cancelled out by moving towards the other. This region displays no change in the magnetic field.

This principle is also valid when considering the Helmholtz coil in a pickup/measurement arrangement.

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