Gemological Institute of America, Inc. (GIA) (Carlsbad, CA)
These methods and systems can be used to take pictures of fluorescence of gems, like diamonds that are placed on flat stage. A setup is used to send light and capture the image from the tableside of the gemstone. This is done by passing ultraviolet (UV) and light of between 10 and 400 nm to the stone and then taking the image of excited fluorescence. The image is studied with a dichroic beam splitting. Certain examples have a cutoff that is 300 num. The dichroic beam splitter arrangement allows for the camera to focus on the same area of the stage as well as the gemstones over and over again for convenience and without moving, changing or altering the equipment to suit various samples.
The need for a systematic and easily reproducible analyzing method is required for gems. The current technologies are designed to provide the light source into a stone or into its pavilion. This requires cumbersome aiming the source of light onto a portion of the stone, which could vary based on its size and form. The method may not be quickly replicable due to aiming restrictions and other parameters. Further, using this method, additional hardware could be required to adjust, aim or concentrate an imaging or illumination source onto gemstones. That is because auto-focusing on gemstones is difficult. The facets of polished gems are hard to auto-focus on because the surface isn’t definable and identifiable features for the camera and software to analyse and pinpoint.
Other systems employ gemstone holders, which are required to place the stone under evaluation at a particular angle, and to hold it there while imaged.
A different example of a system makes use of components that are large enough to be compacted into a single unit.
These systems and methods provide technical solutions to technical problems using a reproducible setup that allows users to easily place and analyze stones with minimal changes from stone to.
Systems and methods here may be employed to offer the ability to analyse the appearance of a stone, particularly a images of fluorescence, like a diamond that is easily reproducible arrangement that minimizes adjustments between target stones and yet produces reliableresults.
In some examples as well as alternatively techniques and systems of taking and analyzing images of fluoresces of a specimen gemstone consist of generating a fluorescent exciting beam, and directing the excited beam into a filter, and then to a dichroic beam splitter, in which the dichroic beam splitter has been designed to reflect wavelengths of the fluorescence exciting beam and pass the wavelengths of excited fluorescence away from the sample gemstone, being able to receive, via the camera equipped with processors and memory, an excited fluorescence image of the gemstone sitting on a table sapphire stage, the excited fluorescence photogram has been passed through the dichroic beam splitting device, digitizing, using the camera computer, the receivedfluorescence image of the sample gem, and sending, by the camera computer, the digital image of the table of gemstones to a computer’s storage for data. In some examples in addition or alternatively it is further comprised of, using a back-end computer equipped with a processor and a memory, comparing a subsequent digital image with the digitized image and determining a match for identification. In some examples, alternatively or additionally, including, in addition, the analysis of, by a back end computer equipped with a processor and memory, the stored digitized image for determination of whether the diamond in the sample is a natural synthetic or natural diamond. The wavelength of the directed, filtered beam can be varied from 200 nm up to 250 nm, in some instances. The wavelength of the directed filter beam can be used in some cases, either alternatively or additional. A Xe flash light lamp is a good source of the fluorescence beam in certain cases. In some examples,alternatively or additionally, the excited fluorescence image from the sample gemstone resting table-side down on a sapphire stage has a wavelength between 400 nm and 700 nm. In some examples in addition or alternatively, the comparing of the seconddigitized image to the stored digitized image and determining a suitable match for identification is the comparison of a subset of pixels from the full-digitized images. In some examples, alternatively or additionally, the excited fluorescence image from the samplegemstone resting side-by-side on a sapphire stage, is also reflected off of a mirror prior to it being received by the camera and passing through the dichroic beam splitter. The dichroic beam splitter may be designed to pass the wavelength of 300 nm or more or reflect wavelengths below 300 nm in some cases. In certain instances and additionally the filter through which the beam of fluorescence is filtered includes a polarization sensitive filter.
These systems and methods include the analysis of fluoresce images of samples of gemstones. The light generated by the light generator could have a wavelength between 200 to 250 nanometers in some instances. The beam’s wavelength could be utilized in certain situations, either alternatively or additionally. A computer system communicating with the camera is a different instance. The computer system may be set up to store and read the digital image of the sample table. The digital image could be used to determine if the sample gemstonetable has been constructed from synthetic or natural gemstones. In some instances further, or in addition the computer system is further configured to compare the image digitized from the sample gemstone table with stored images of other tables for gemstones and identify an identity match using the compared pixels of the images. Mirrors are placed between the camera, dichroic beam splitter and camera. The mirror is designed to reflect excited fluorescence images into it. The dichroic beam splitter may be set to transmit wavelengths that are greater or lesser than 300nm, and in some cases, it can reflect wavelengths lower than 300nm. In other instances the polarization sensitive filter is set up to filter light from the light generator. In some instances and in some other examples, the sample gemstone is backed by a light-absorbing material to reduce reflections. In addition, the computer can be used to examine the image digitally for color variations, boundary color detection, and identification of synthetic overgrowth.
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