VLF is the most common technology used in consumer detectors. It uses two coils: a transmitter and a receiver. Operates on continuous wave phase-shift analysis. Excellent at discriminating between different metal types. Vulnerable to ground mineralization interference. 2. Pulse Induction (PI)
Uses two radio frequency oscillators mixed together to create an audible beep.
Anyone studying applied electromagnetics and analog circuit design. Inside The Metal Detector George Overton Carl Moreland.pdf
The authors use physics to explain why doubling the size of your search coil does not double your depth. You will understand the law of diminishing returns regarding coil size and target surface area.
BFO is the simplest and oldest form of metal detection technology. VLF is the most common technology used in consumer detectors
The Ultimate Guide to "Inside the Metal Detector" by George Overton and Carl Moreland
Not all metals react to a magnetic field in the same way. The authors explain how a target's conductivity, shape, and overall size dictate its . Highly conductive items like silver coins react slowly (high phase shift), while poorly conductive items like iron or small gold nuggets react incredibly fast (low phase shift). Understanding this phase relationship is the key to designing functional target discrimination. Inside the Metal Detector | Friendly Metal Detecting Forum Excellent at discriminating between different metal types
The book is available for purchase in physical format, which is the best way to support the authors and publishers. However, PDF versions are also available online through various sources, including some book aggregator sites. For those who want to preview the content before buying, the official Geotech website also offers the full Table of Contents online.