Which of the following types of sensors is designed to detect metal objects?

Magnetic Point Sensors (MPS) are specifically designed to detect metal objects by sensing changes in the magnetic field around them. These sensors work by monitoring the magnetic signature produced by ferromagnetic materials, such as iron, nickel, and cobalt. When a metal object comes within their detection range, the sensor registers a magnetic disturbance and triggers an alert or an action.

The functionality of Magnetic Point Sensors makes them particularly useful in border patrol operations, where detecting hidden or discarded metal objects, such as weapons or tools, is crucial for safety and security monitoring. Their ability to pinpoint specific locations of metal also aids in search and recovery efforts.

Other sensor types, such as pressure pads, infrared sensors, and motion sensors, serve different purposes in surveillance and detection but do not specialize in identifying metal. Pressure pads detect weight or pressure applied to a surface, infrared sensors register heat signatures, and motion sensors are designed to detect movement within a designated area. Each of these has its own application but does not have the same capability as Magnetic Point Sensors in detecting metallic objects specifically.