Optical system and methods for the determination of stress in a substrate

    公开(公告)号:US10113861B2

    公开(公告)日:2018-10-30

    申请号:US15313897

    申请日:2015-05-28

    Abstract: Methods and systems are disclosed for measuring multidimensional stress characteristics in a substrate. Generally, the methods include applying a sequence of optical pump pulses to the substrate. The optical pump pulses induce a propagating strain pulse in the substrate. Optical probe pulses are also applied. By analyzing transient optical responses caused by the propagating strain pulse, multidimensional stress components characterizing the stress in the substrate can be determined. Multidimensional stress components may also be determined at a depth of a substrate. Multidimensional stress components may also be determined at areas adjacent a through-silicon via.

    Spectroscopic determination of optical properties of gemstones

    公开(公告)号:US10054550B2

    公开(公告)日:2018-08-21

    申请号:US15502239

    申请日:2014-08-08

    Inventor: Yansong Gu

    Abstract: Technologies are generally described for spectroscopic determination of one or more optical properties of a gemstone. An imaging device may include one or more light sources configured to illuminate one or more portions of the gemstone, and one or more photo detectors configured to detect reflected light from the portions of the gemstone in response to the illumination. An analysis module may be communicatively coupled to the imaging device, and configured to analyze the reflected light to determine the optical properties of the portions of the gemstone. The optical properties may include at least one of a clarity, color, fluorescence, birefringence, dichroism, and brilliance of the portions of the gemstone. In some examples, an optical fingerprint of the gemstone may be created based on one or more determined optical characteristics of the portions of the gemstone, where the optical fingerprint may uniquely identify the gemstone.

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