ALEXANDRIA, Va., Feb. 7 -- United States Patent no. 11,892,620, issued on Feb. 6, was assigned to INSTITUT NATIONAL D'OPTIQUE (Quebec, Canada).

"Target device for characterizing terahertz imaging systems" was invented by Alex Paquet (Quebec, Canada) and Francois Berthiaume (Quebec, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "Target devices for characterizing terahertz imaging systems are provided. The target devices include a terahertz resolution pattern having spatially distributed resolution features and one or more prism assemblies configured to provide a variable contrast level within the resolution features when used with terahertz radiation. Each prism assembly includes first and second prism...