How metal detectors in the airport work
Metal detectors make use of the James Clerk Maxwell laws. James Clerk is a Scottish scientist who discovered the relationship between electricity and magnetism. The metal detectors in the airport make use of pulse induction (PI) technology. It is a kind of technology that sends powerful pulses of current through a coiled wire. In each pulse production, there is a creation of a magnetic field.
The purpose of the magnetic field is to react with the receiver coils and trigger the alarm system. However, the initiating spike lasts for less than a second. It causes a correct with is referred to as a reflected pulse to run through the coils. A point to note is that the size and timing of the pulse clearly define the size and position of the object (Hsu & Apel, 2015). Within the metal detectors, there is a sampling circuit which assists in monitoring the duration of the reflected pulse. Comparing the expected duration and the current period helps the circuit to determine if there is a chance the magnetic field has influenced the reflected pulse to take a longer time to fade. In case it happens, the pulse will take more time to disappear meaning a metal object is interfering (Skorupski & Uchroński, 2017).
Metal detectors found in the airports are designed in a way that they create large magnetic fields that cover all the space of the arch of the metal detector. In case a person walks through the sensor, and the alarm sets off, the security people are informed. The metal detectors are designed in a manner that they have multiple zones that help distinguish where precisely the location of the metal objects. The multi-zoned sensors are more efficient as they have very many coils that create separate zones of detection. The latest detectors have up to thirty-three zones, and this makes it easier for metal detection (Cavoukian, 2011). Don't use plagiarised sources.Get your custom essay just from $11/page
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References
Cavoukian, A. (2011). Whole body imaging in airport scanners: Building in privacy by design. Information and Privacy Commissioner of Ontario.
Hsu, H. Y., & Apel, R. (2015). A situational model of displacement and diffusion following the introduction of airport metal detectors. Terrorism and Political Violence, 27(1), 29-52.
Skorupski, J., & Uchroński, P. (2017). A fuzzy model for evaluating metal detection equipment at airport security screening checkpoints. International Journal of Critical Infrastructure Protection, 16, 39-48.