Detection Technology
TDI SL use a powerful reliable Pulse Induction technology for detection of possible metal objects buried underground like small coins, relics or jewellery. In Pulse Induction there is one electric coil used in the search head (coil), it acts as a transmitter and receiver at the same time. The coil sends powerful, short electrical pulses, each pulse generates a very tiny magnetic field. When this pulse is fades away, the polar magnetic field reverses and suddenly collapses, this electric current lasts for several microseconds, so it causes an electrical current to flow through the coil which lasts about 30 microseconds. Then another electrical pulse is sent and the process is repeated a number of times (2600 beats per second). When this flow of pulses collides by a buried metal object such as a coin, a magnetic field is generated in the metal body, the reflected pulses and the current passing through the coil are determined by a metallic target and the user is alerted by sound tones.

Ground Balance
One of the main features of the TDI SL is its ability to achieve the ground balance of the mineralization value of the ground while maintaining the depth provided by the use of pulse induction technology.
This is achieved using a differential technique where two of the dissolution samples are compared. The ground balance is adjusted by adjusting the values ​​so that the two samples have the same response, thus eliminating the ground signal.
Adjust Settings Using Controls TDI SL includes a set of keys, knobs to control different settings related to current and pulse generation for fine-tune of detection process. Included controls are as following:
– Frequency This control allows adjustment of the pulse rate, it used to reduce the effect of any electronic interference that may be caused by external electromagnetic sources.

Applications & Uses
TDI SL device considered a versatile metal detector as it can be used for different purposes including for example:

• Natural gold prospecting, it can find gold nuggets and gold veins
• Coin shooting including ancient or modern coins made of silver or bronze or gold.
• Detect ferrous metals like iron, steel and so on.
• Find ancient relics and artifacts like jewellery such as rings-collars…