The Development of Metal Detector
The first metal detector was invented by Dr. Fisher (Gerhard R. Fisher) in California, United States 1931, which was called Metalloscope( M-Scope). And it won the patent. The patent in the United States Patent and Trademark Office announced the patent number US002066561, in the European patent database, the patent number is US2066561. From 1931 to now, more than 50 years have passed, metal detectors have undergone several generations of changes in detection technology. From the initial signal simulation techniques, continuous wave technique to the digital pulse technology used today. The simple magnetic field cutting principle of metal detector is introduced into many kinds of scientific and technological achievements. Both the sensitivity, resolution, detection accuracy and work performance have a qualitative leap, the application field also extends to many industries with the improvement of product quality.