Walkthrough screening system enhances security at airports nationwide

A brand new safety screener that individuals can merely stroll previous might quickly be coming to an airport close to you. In 2024, U.S. airports nationwide started adopting HEXWAVE—a commercialized walkthrough safety screening system primarily based on microwave imaging know-how developed at MIT Lincoln Laboratory—to fulfill a brand new Transportation Safety Administration (TSA) mandate for enhanced worker screening to detect metallic and nonmetallic threats.

The TSA is now within the technique of evaluating HEXWAVE as a possible alternative for metallic detectors to display PreCheck passengers.

Usually, once you arrive at an airport safety checkpoint line, you place your carry-on objects on the conveyor belt, take away your footwear and any metallic objects, and enter a physique scanner. As you maintain nonetheless for a number of seconds together with your ft unfold aside and your arms prolonged over your head, the scanner creates a generic, featureless 3D physique define revealing any metallic or nonmetallic hid weapons or different prohibited objects.

Requiring people to cease, take away clothes and belongings, and pose for scans impedes site visitors stream in airports and different extremely populated venues, comparable to stadiums, procuring malls, mass transit stations, and colleges.

To allow extra environment friendly screening of unstructured crowds and guarantee public security, the Division of Homeland Safety (DHS) Science and Know-how Directorate (S&T) sponsored Lincoln Laboratory to prototype a high-resolution imaging system able to scanning individuals and their belongings as they stroll by.

This R&D effort was carried out as a part of S&T’s Surface Transportation Explosive Threat Detection Program, which goals to supply the surface-transportation end-user neighborhood (e.g., mass transit) with a layered and built-in functionality to detect risk objects on the velocity of the touring public.

The Laboratory’s prototype microwave imager, which consists of a set of antennas put in on flat panels, operates beneath the identical basic precept as present physique scanners. Low-energy radio waves (much less highly effective than these transmitted by a cellphone) are transmitted from antennas towards an individual’s physique and mirror off pores and skin and any hidden objects; the mirrored waves return to the antennas and are processed by a pc to create a picture, which safety personnel then overview to determine any potential hid threats.

The novelty of the Laboratory’s invention lies in its capability to discreetly deal with a relentless stream of topics in movement, measuring every topic in a short time (inside tens of milliseconds) and reconstructing 3D microwave photographs of every topic at a video price.

To fulfill these difficult necessities, the laboratory workforce developed an economical antenna array and environment friendly image-reconstruction algorithms. In comparison with present methods, the Laboratory’s 3D microwave imager runs 100 occasions quicker utilizing the identical computing {hardware}.

In 2017, the workforce demonstrated the prototype’s capability to detect varied simulated risk objects at various distances on a rail platform on the Massachusetts Bay Transmit Authority (MBTA) Emergency Coaching Heart in Boston, Massachusetts.

“The purpose of our work is to supply safety workers with more practical instruments to guard public areas. To that finish, microwave imaging know-how can shortly and unobtrusively present visibility of things carried right into a venue,” says William Moulder, who led the know-how’s growth at Lincoln Laboratory.

Supplied by
MIT Lincoln Laboratory