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, ]
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