A highly sophisticated Multi-Zone DFMD is capable of detecting

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metallic items above a set threshold level.

metallic as well as non-metallic items.

metallic items, non-metallic items, as well as conventional explosives.

metallic items, non-metallic items, as well as all explosives including plastic and liquid explosives.

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This question was previously asked in

UPSC CISF-AC-EXE – 2020

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A Door Frame Metal Detector (DFMD) works on the principle of electromagnetic induction. It detects changes in a magnetic field caused by the presence of metallic objects as a person passes through the frame. A Multi-Zone DFMD provides better spatial resolution, indicating the approximate height location of the detected metallic item. Regardless of sophistication or the number of zones, the core function of a DFMD is limited to detecting metallic items.

DFMDs are designed specifically for the detection of metals.

Detection of non-metallic items or explosives requires different technologies such as X-ray scanners (for density and shape), trace detectors (for chemical residues), or advanced imaging systems. While some modern screening systems might integrate multiple technologies, a device solely described as a Multi-Zone DFMD primarily performs metallic item detection.

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