What type of sensors can detect objects that cannot be sensed using sound, radio frequency, or light energy?

Magnetic sensors are specialized devices designed to detect the presence and properties of magnetic fields. Unlike visual, acoustic, or radio frequency sensors that rely on sound, light, or electromagnetic waves, magnetic sensors can identify objects based on their magnetic properties, such as ferromagnetism. This capability allows them to sense metallic objects or variations in the earth’s magnetic field, which cannot be perceived through other types of energy.

For example, magnetic sensors can be effectively used in applications such as detecting underground metal pipes or surveying magnetic anomalies in geological formations. Their operational principles are rooted in the ability to measure changes in magnetic flux or magnetic field strength, making them uniquely suited for tasks that evade the detection methods associated with sound, radio frequency, and light energy.