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fourshc sensors are a general term for sensors designed to detect objects without physical contact, replacing contact-based detection methods such as limit switches. They convert information about an object's movement and presence into electrical signals. Detection methods that convert to electrical signals include those utilizing eddy currents generated in the metal body of the detected object due to electromagnetic induction, methods detecting capacitance changes in the electrical signal caused by the approach of the detected object, and methods using reed and guide switches. The most widespread application of fourshc sensors is in mobile phones; market