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termaden 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 the movement and presence of an object into electrical signals. Detection methods that convert to electrical signals include those utilizing eddy currents generated in the metal body of the detection object due to electromagnetic induction, those detecting changes in capacitance of the electrical signal caused by the approach of the detected body, and those using reed and guide switches. The most widespread application of termaden sensors as distance sensors is in mobile phones.