Abstract
The prospect of being able to move through security without the inconvenience of separating liquids from bags is an exciting one for passengers, and there are important operational benefits for airports as well. Here, two terahertz (THz) systems, 100 GHz sub-THz line scanner and attenuation total reflection-based THz time domain spectroscopy (TDS), have been used to demonstrate the capability of identifying different liquid samples. Liquid samples’ THz complex permittivities are measured and their differences have contributed to the variation of 100 GHz 2D images of volatile liquids with different volumes inside of cannister bottles. The acquired attenuation images at 100 GHz can easily be used to distinguish highly absorbed liquids (Water, Ethanol, Fuel Treatment Chemicals) and low loss liquids (Petrol, Diesel, Kerosene and Universal Bottle Cleaner). The results give a promising feasibility for mm-wave imager and THz spectroscopy to efficiently identify different volatile liquids.
Highlights
In 2019, security restrictions at airports for carry-on luggage have eased significantly since the turbulent response to the 2006 liquid explosives plot
This paper aims to detect and identify different liquid samples via various THz methods
The 2D images acquired from the line scanner and the detailed Fclear are presented in the Supplementary Tables S1–S5
Summary
In 2019, security restrictions at airports for carry-on luggage have eased significantly since the turbulent response to the 2006 liquid explosives plot. The technology offers more detailed and comprehensive image quality; it was not able to highlight whether a substance was a solid or a liquid This limited its ability to flag potentially explosive substances and required much more intervention and analysis from members of staff, which made potentially dangerous substances prone to oversight and human error. The reason this happens is because normal liquids we drink all have densities in the range of around 1.0 g/cc and the average atomic number is similar to the ranges of those major explosives. This is why the airport security system does not allow passengers to carry liquids into an airport checkpoint because they could generate false alarms and slow down the lines
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