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Views: 0     Author: Site Editor     Publish Time: 2022-01-03      Origin: Site

By sending an electromagnetic field from the coil into the ground, metal detectors are able to detect metal. Within an electromagnetic field, any metal objects (targets) will become energized and will broadcast their own electromagnetic field. Detectors receive retransmitted fields and respond with target responses when they receive a retransmitted field. Alongside the metal detector, there are needle detector manufacturer and supplier who makes needle inspection and detector that helps in detecting needle or metal chips with the help of cycled magnetic sensors. The accuracy level is high.

There are different types of targets that metal detectors from Minelab detect, and they can be configured to ignore unwanted targets.


1. Control Box

The detector's electronics are located in the control box. It is here where to transmit signals are generated and received signals are converted into target responses.

2. Search Coil

An electromagnetic field is transmitted by the search coil into the ground and is received by a target.

3. Transmit Electromagnetic Field

By transmitting electromagnetic fields, targets are energized so they can be detected.

4. Target

A metal detector detects targets when they contain metal. It is a good (acceptable) target to detect treasure in this example.

5. Unwanted Target

Nails and other ferrous targets (attracted by magnets) are generally unwanted objects, but others, like bottle tops, can be non-ferrous. A target response will not be produced for those targets if the metal detector is configured to reject unwanted targets.

6. Receive Electromagnetic Field 

A search coil is able to receive the electromagnetic field generated by energized targets.

7. Target Response

The metal detector will emit an audible signal when an acceptable target has been detected, such as a beep or change in tone. A number of Minelab detectors also provide a visual display of target information such as an ID number or two-dimensional display.

metal detector1



A metal detector's frequency is one of the key factors that determine how well it can detect targets. Single-frequency detectors transmitting at high frequencies are usually more sensitive to small targets, while single-frequency detectors transmitting at low frequencies will have a greater depth of image when used on large targets. MineralLab offers single frequency technologies known as VLF and VFLEX.

Ground Balance

Mineralized soils have a deeper detection depth when the ground balance is increased. Red earth may consist of fine iron particles or salts, like wet beach sand. Similar to the way a target responds to a detector's transmit field, minerals do the same.

There are three main types of Ground Balance:

1. Manual Ground Balance 

2. Automatic Ground Balance

3. Tracking Ground Balance



By discriminating buried targets, a metal detector can determine whether they are conductive and/or ferrous. You can either dig up a buried target or leave it behind as junk and keep searching if you can identify it accurately.

Minelab detectors discriminate in four ways:

1. Variable discrimination

2. Iron Mask/Iron Reject

3. Notch discrimination

4. Smartfind 



A coil's diameter is the simplest way to calculate the depth of the coil. The larger the coil, the deeper the detector will detect.

As well as detector technology and the environment, detection depth is affected by many other factors. Metal detectors can detect targets at a depth that depends on a variety of factors, such as:

Target Size

Targets that are large can be detected at a deeper depth than targets that are small.

Target Shape

Shapes that are circular like coins and rings are easier to detect than long thin shapes like nails.

Target Orientation

Coins lying horizontally (e.g. on their sides) can be detected more deeply than coins lying vertically (e.g. on their edges).

Target Material

Metals with high conductivity (such as silver) can be detected deeper than metals with low conductivity (such as lead or gold).




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