Which of the following protection devices is used for spot protection within a few inches of the object, rather than for overall room security monitoring?
Click on the arrows to vote for the correct answer
A. B. C. D.B.
Capacitance detectors monitor an electrical field surrounding the object being monitored.
They are used for spot protection within a few inches of the object, rather than for overall room security monitoring used by wave detectors.
Penetration of this field changes the electrical capacitance of the field enough to generate and alarm.
Wave pattern motion detectors generate a frequency wave pattern and send an alarm if the pattern is disturbed as it is reflected back to its receiver.
Field- powered devices are a type of personnel access control devices.
Audio detectors simply monitor a room for any abnormal sound wave generation and trigger an alarm.
Source: KRUTZ, Ronald L.
& VINES, Russel.
D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 10: Physical security (page 344).
The correct answer is B. Capacitance detectors.
Capacitance detectors are used for spot protection within a few inches of the object, rather than for overall room security monitoring. They work by detecting changes in the electrical field around an object. When an object enters the electrical field, it disturbs the field and triggers an alarm. Capacitance detectors are commonly used to protect individual items such as artwork, antiques, or electronic equipment.
Wave pattern motion detectors are used for overall room security monitoring. They work by detecting changes in the wave patterns of a room caused by movement. Field-powered devices are used to monitor the overall security of a room or area and are powered by the electrical field in the area. Audio detectors are used to detect specific sounds, such as breaking glass or gunshots.
It's important to choose the right type of protection device for your specific security needs. In some cases, multiple types of devices may be needed for comprehensive security coverage.