What is a search coil on a metal detector?

A metal detector coil, also called a search coil, is a coil of wire at the end of your metal detector. This is the part of the metal detector that you sweep along the ground to discover metals hidden beneath the surface.

Which coil is best for metal detector?

6 Best Metal Detector Coils

  • Teknetics 8in. Search Coil (Greek Series)
  • Nokta Makro IM28 DD Search Coil (Impact)
  • Minelab DD Commander Search Coil (GPX / GP / SD)
  • JW Fishers Search Coil with Connector (Pulse 6x/8x)
  • Garrett Mono Search Coil (ATX)
  • Coiltek Elite Camo Mono Search Coil (SD / GP / GPX)

What material can a metal detector not detect?

Metal detectors have a tough time detecting metals like stainless steel, which have very poor electrical conductivity. Stainless steel has low magnetic permeability, which means it does not produce a signal strong enough to be detected. Other items that metal detectors won’t be able to locate include: Gemstones.

How deep can a metal detector search?

Most metal detectors can detect objects about 4-8ʺ (10 – 20 cm) deep. In ideal conditions, a mid-range metal detector can reach 12-18ʺ (30-45 cm) underground. Some specialized detectors can go as deep as 65′ (20 m).

How does a search coil work?

A search coil monitors the rate of change of leakage flux in the air gap as the rotor rotates (Fig 6.91). The signal from one pole is subtracted from the signal from the other; significant differences are indicative of one or more turns in a coil becoming short-circuited.

What is a metal detector coil made of?

The most common type of metal detector is a hand-held metal detector or coil-based detectors using oval-shaped disks with built-in copper coils. The search coil works as sensing probe and must be moved over the ground to detect potential metal targets buried underground.

Is a bigger coil better on a metal detector?

The size of a coil can influence the detection depth and sensitivity of a metal detector. A good rule of thumb is ‘the larger the coil, the more ground you can cover and the deeper it can go’.

Can metal detectors detect non-magnetic metals?

Metal detectors will detect non-magnetic metals such as gold, silver, copper, and tin. Only ferromagnetic materials such as iron, cobalt, and nickel are attracted to magnetic fields strongly enough to be truly considered magnetic.

Can metal detectors detect all metals?

What type of metal can be detected? A. MDI Metal Detector Systems will detect all types of metal. There are three basic categories: Ferrous (magnetic), Non-Ferrous (non-magnetic), and Stainless Steel.

Where are search coil used?

A search coil is used to measure eye movement using coils that are embedded into a tightly-fitting contact lens or a rubber ring that adheres to the eye. In animal studies, the search coil may be surgically implanted into the sclera of the eye.