ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,416,575, issued on Sept. 16, was assigned to PyroScience GmbH (Aachen, Germany).
"Reference measurement" was invented by Roland Thar (Aachen, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method and apparatus for determining a decay time of a luminescence of a sample, comprising the following steps: excitation of a light source by means of an excitation current from a current source; irradiating the sample with a light of a wavelength suitable for exciting luminescence in the sample, periodically varying the irradiation intensity; measuring a light emitted from the sample, generating a first electrical signal in response to the light emitted...