Patent ID: 11879842
Assignee: GEMOLOGICAL INSTITUTE OF AMERICA, INC. (GIA)
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method of capturing and analyzing luminescence images of a sample gemstone, the method comprising:
generating a first set of luminescence exciting beam pulses at a first light source;
directing the first luminescence exciting beam pulses through a first filter and to a first dichroic beam splitter, and a second dichroic beam splitter,
wherein the first dichroic beam splitter is configured to reflect wavelengths of the first luminescence exciting beam pulses and pass wavelengths of luminescence excitation from the sample gemstone, and

wherein the second dichroic beam splitter is configured to pass wavelengths of the first luminescence exciting beam pulses;
receiving, at a camera with a computer processor and a memory, a first excited luminescence image from the sample gemstone on a stage, wherein the excited first luminescence image having passed through the first dichroic beam splitter and the second dichroic beam splitter;
receiving, at the camera with the computer processor and the memory, a second excited luminescence image from the sample gemstone on the stage, wherein the excited second luminescence image having passed through the second dichroic beam splitter and the first dichroic beam splitter and wherein the first and second excited luminescence image are captured by the camera 50 μs apart and responsive to triggers specifying a first time delay to capture the first excited luminescence image 130 μs after turning off the first luminescence exciting beam pulses;
digitizing, by the camera computer, the received first and second luminescence images of the sample gemstone; and
sending, by the camera computer, the digitized images of the sample gemstone to a computer data storage.