US 12,340,677 B2
Personnel inspection with threat detection and discrimination
Michael Ellenbogen, Wayland, MA (US); Alec Rose, West Hartford, CT (US); Peter Lorenz, Boston, MA (US); and Christopher Cahill, Northborough, MA (US)
Assigned to Evolv Technologies, Inc., Waltham, MA (US)
Filed by Evolv Technologies, Inc., Waltham, MA (US)
Filed on Apr. 1, 2024, as Appl. No. 18/623,585.
Application 18/623,585 is a continuation of application No. 18/085,152, filed on Dec. 20, 2022, granted, now 11,954,994.
Application 18/085,152 is a continuation of application No. 17/550,170, filed on Dec. 14, 2021, granted, now 11,568,734, issued on Jan. 31, 2023.
Application 17/550,170 is a continuation of application No. 16/664,565, filed on Oct. 25, 2019, granted, now 11,232,700, issued on Jan. 25, 2022.
Claims priority of provisional application 62/751,490, filed on Oct. 26, 2018.
Prior Publication US 2024/0249612 A1, Jul. 25, 2024
Int. Cl. G08B 23/00 (2006.01); G01V 3/08 (2006.01); G06F 7/72 (2006.01); G06T 11/60 (2006.01); G07C 9/38 (2020.01); G08B 5/22 (2006.01)
CPC G08B 23/00 (2013.01) [G01V 3/08 (2013.01); G06F 7/72 (2013.01); G06T 11/60 (2013.01); G07C 9/38 (2020.01); G08B 5/22 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, from a plurality of magnetic field receivers including magnetic sensors, data characterizing samples obtained by the plurality of magnetic field receivers in a first time period, the samples based on a combination of a first magnetic field and a second magnetic field resulting from interaction of the first magnetic field and a plurality of objects passing through a personnel inspection system comprising the plurality of magnetic field receivers in the first time period;
determining one or more intermediate time periods within the first time period, the one or more intermediate time periods corresponding to time periods in which values of the received data are indicative of no object passing through the personnel inspection system;
determining, using the received data, a polarizability index for a first object of the plurality of objects within the first time period, the polarizability index characterizing a magnetic polarizability property of the first object;
classifying, using the determined polarizability index, the first object as threat or non-threat within the first time period; and
providing the classification of the first object within the first time period.