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NAIDEKA 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 utilizing capacitance changes in electrical signals caused by the approach of the detected body, and those utilizing reed and guided switches. The NAIDEKA sensor detection principle detects, on the conductor surface, through the influence of an external magnetic field.