Inside the Metal Detector by George Overton and Carl Moreland is widely considered the definitive technical resource for understanding how metal detectors work and how to design them. Published by Geotech Press, it serves as a bridge between the hobbyist treasure hunter and the electrical engineer, providing the first in-depth look at this technology in decades. Overview of the Book
VLF (Very Low Frequency): Covers ground balance, motion filtering, and the mechanics of discrimination. Inside The Metal Detector George Overton Carl Moreland.pdf
Useful for Both Beginners and Experienced Detectorists Inside the Metal Detector by George Overton and
If you find the PDF, take your time. Read the oscillator section twice. Draw the coil nulling diagram on a napkin. Then, take your detector into the field. You will hear the ground differently. You will understand the chatter of EMI. And you will finally know what is actually going on inside that plastic box at the end of your shaft. Security : Metal detectors are widely used in
Overton and Moreland break down the various types of detection systems, providing both theory and practical project designs for:
The first metal detector was invented in 1900 by Italian physicist, Augusto Nascenzi. However, it wasn't until the 1960s that metal detecting began to gain popularity as a recreational activity. During this time, metal detectors were relatively simple, using a single coil to detect metal objects. These early detectors were prone to interference and often produced false signals, making it difficult for users to pinpoint targets.
VLF (Very Low Frequency): The most common modern technology used for distinguishing between different types of metal (discrimination).