NCIDQ IDFX Practice Exam

Which type of detector might use a pulsed infrared beam for monitoring?

1. Glass break detector

2. Photoelectric beam

3. Magnetic contacts

4. Window screen

The correct answer is: Photoelectric beam

A photoelectric beam detector operates by sending out a pulsed infrared beam which, when interrupted by an object, triggers an alarm or alerting mechanism. This technology relies on the principle that the interruption of the beam indicates a potential intrusion, making it particularly effective for securing large areas or entry points. The pulsed infrared nature allows for precise monitoring and the capability to reduce false alarms caused by small animals or environmental factors. Glass break detectors, magnetic contacts, and window screens serve different functions. Glass break detectors typically use microphones or vibration sensors to detect the sound or vibrations associated with breaking glass, rather than employing an infrared beam. Magnetic contacts are utilized in door and window security systems, detecting the opening or closing of an entry point without the use of infrared technology. Window screens are physical barriers that can prevent entry but do not function as detectors. Given these distinctions, the use of a pulsed infrared beam specifically aligns with the operational characteristics of a photoelectric beam detector.