Automated defect detection and mapping for optical filters

    公开(公告)号:US09927369B2

    公开(公告)日:2018-03-27

    申请号:US15172592

    申请日:2016-06-03

    Inventor: Robert Sprague

    Abstract: Devices and methods are disclosed for characterizing point flaws (including pinholes and point defects) of an optical filter. A passband test is performed, including: illuminating the optical filter with passband illumination whose spectral range at least overlaps a passband of the optical filter; acquiring a passband map of the optical filter using a two-dimensional array of photodetectors while illuminating the optical filter with the passband illumination; and identifying point defects of the optical filter as low intensity locations of the passband map. A stopband test is performed, including: illuminating the optical filter with stopband illumination whose spectral range lies entirely outside of the passband of the optical filter; acquiring a stopband map of the optical filter using the two-dimensional array of photodetectors while illuminating the optical filter with the stopband illumination; and identifying pinholes of the optical filter as high intensity locations of the stopband map.

    Electronic devices with environmental sensors

    公开(公告)号:US09927360B2

    公开(公告)日:2018-03-27

    申请号:US15250714

    申请日:2016-08-29

    Applicant: Apple Inc.

    Inventor: Richard Yeh

    Abstract: An environmental sensor may include a heat source that heats a metal oxide sensing material. Electrodes may be formed in the metal oxide sensing material that measure the resistance of the metal oxide sensing material to determine the concentration of various gases. The environmental sensor may include an infrared light source that emits infrared light at a given wavelength. An infrared detector and band-pass filter may be used to detect the concentration of a particular gas such as carbon dioxide. In order to reduce power consumption, a heater may act as both the heat source for the metal oxide sensing material and the infrared light source for the infrared detector. The metal oxide sensing material, heater, and infrared detector may be formed in the same enclosure. The enclosure may have an opening that is aligned with an opening in an electronic device housing.

    Both ultraviolet-visible and double monochromatic fluorescence dual detector for high performance liquid chromatography

    公开(公告)号:US09921197B2

    公开(公告)日:2018-03-20

    申请号:US15042091

    申请日:2016-02-11

    Applicant: Jiade Yu

    Inventor: Jiade Yu

    Abstract: A both ultraviolet-visible and double monochromatic fluorescence dual detector has a small inner-casing, which combines both ultraviolet-visible and double monochromatic fluorescence dual detector widely used in the high performance liquid chromatography by taking the first to use deuterium lamp as the individual light source of the dual detectors, the individual sample detection cell and the individual electrical circuit, the device comprises a detection optical member, which including a first monochromatic spectroscopic device—raster G1, a second monochromatic spectroscopic device—raster G2, a light source, four groups of lens needed for processing the light paths; and a detection electromechanical member, which includes: a central controller, a proposed amplifying module, an auto gain module, a noise processing module and a logarithm amplifying module. The dual detector realizes the sensitivity and stability, also the elimination of noise and drift.

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