What type of detector is designed to detect an opening in a ceiling door or wall?

The type of detector designed specifically to detect an opening in a ceiling, door, or wall is a perimeter detector. Perimeter detectors are strategically placed around the boundaries of a protected area to monitor and alert for breaches in physical security. They can utilize various technologies such as magnetic sensors for doors and windows or infrared sensors that can detect movement or changes within a defined perimeter.

Motion detectors, while they can also identify movement, are primarily concerned with detecting presence within an area rather than specifically monitoring openings. Heat detectors are focused on temperature changes and are typically used for fire prevention rather than for securing physical entrances. Glass break detectors are aimed at recognizing the sound of breaking glass, thus designed for windows rather than wall, ceiling, or door openings. Therefore, perimeter detectors are specifically tailored to the task of monitoring and responding to breaches in structural openings, affirming their role in effective security systems.