Magnetometers, used in security screening for detecting metallic objects, typically operate using two main methods:
Continuous-wave: Emits a constant electromagnetic field to detect disruptions caused by metal.
Pulsed-field: Emits bursts of energy and analyzes the return signals to identify metal objects.
These methods allow both walk-through and handheld devices to detect ferrous and non-ferrous metals.
A, C, and D include terms not applicable to standard magnetometer operation.
[References:, PSP Study Guide – Weapons and Metal Detection Systems, POA Manual – Electronic Screening Technologies, , ]
Question # 115
A device that is designed to respond to a certain change in conditions, such as the opening of a door, movement within a room or rapid rise in heat is known as:
An alarm sensor (also called a detector or initiating device) detects specific changes such as motion, temperature, or opening/closing of entry points. It is the primary component in any detection system and initiates the alarm response.
[References:, , ASIS International, Protection of Assets (POA), Chapter: Intrusion Detection and Alarm Systems, , ASIS PSP Certification Study Manual, Domain 2: Physical Security System Components, ]