DeepTech Metal Detectors & Accessories

Metal detectors coil and search head design - Patents and Utility Models - a review by Rosi Georgieva - DeepTech

Beginning this historical review for this how metal detectors search coils and search heads designs are being developed year in, year out, I understood that it is almost impossible not only to be included all Patents and Utility Models in this abstract, but it is also almost impossible to be found everything which have ever been published in the Patent Offices in the World reach back.

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Making a Pulse Induction Mono Search Coil A Practical How-to Guide and Tutorial By: Joseph J. Rogowski

This article explains and shows you how to make a fast mono coil for a pulse induction (PI) metal detector. The word “fast” refers to the ability of the coil to operate at low sampling delays. Unfortunately, there is not just one thing you can do to make a fast coil, but there are a few things you can do that collectively contribute to the coil’s performance on your PI machine....

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Induction coil sensors - a review by Slawomir Tumanski

This review describes induction coil sensors, which are also known as search coils, pickup coils or magnetic loop sensors. The design methods for coils with air and ferromagnetic cores are compared and summarized. The frequency properties of coil sensors are analysed and various methods for output signal processing are presented.

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Search Coil Basics by Carl Moreland

While most people have no idea what’s inside the control box of a metal detector, many actually have a misperception of what’s in the disc at the other end of the pole, and how it works. In this article we’ll take a peak inside.

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Understanding the PI metal detector by Reg Sniff

Part 1

One of the more popular metal detectors used for nugget hunting today is a type of detector commonly called the Pulse Induction or PI for short. A lot has been written on the general principles of operation but many questions are still unanswered or not answered completely about this strange machine. Also, there is a lot of misinterpretations of information that has been written about PI's and how they work.

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Part 2

All detectors are subject to external noise, but PI's are extremely temperamental in this regard. The reason PI's are more sensitive to noise is due to the design of the preamp or first amplifier stage. For a PI to work at optimum this amplifier has to be built to amplify a very wide range of frequencies to assure the decay signal isn't altered.

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