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    Particulate matter velocity measurement and size estimation using parallel self-mixing sensing
    5.
    发明授权
    Particulate matter velocity measurement and size estimation using parallel self-mixing sensing 有权

    公开(公告)号：US11280714B2

    公开(公告)日：2022-03-22

    申请号：US16547466

    申请日：2019-08-21

    Applicant: Apple Inc.

    Inventor： Omid Momtahan ,  Mehmet Mutlu ,  Miaolei Yan ,  Richard Yeh

    IPC: G01N15/02 ,  G01N15/14

    Abstract: An apparatus for particulate matter (PM) measurement includes a first light source to generate a first light beam and a second light source disposed at a first distance from the first light source to generate a second light beam in parallel to the first light beam to illuminate a PM. The apparatus further includes a first light detector to measure a first timing corresponding to a first self-mixing signal resulting from a reflection and/or back-scattering of the first light beam from a PM, and a second light detector to measure a second timing corresponding to a second self-mixing signal resulting from a reflection and/or back-scattering of the second light beam from the PM. A processor can determine a first velocity of the PM based on a spatial separation between centers of the first light beam and the second light beam and a temporal separation between the first timing and the second timing.

    Configuration and operation of array of self-mixing interferometry sensors
    6.
    发明授权
    Configuration and operation of array of self-mixing interferometry sensors 有权

    公开(公告)号：US11243068B1

    公开(公告)日：2022-02-08

    申请号：US16773827

    申请日：2020-01-27

    Applicant: Apple Inc.

    Inventor： Mehmet Mutlu ,  Mark T. Winkler ,  Tong Chen ,  Omid Momtahan

    IPC: G01B9/02 ,  H01S5/14 ,  H01S5/06 ,  H01S5/026 ,  G01S7/4912

    Abstract: A sensor system includes a self-mixing interferometry sensor; a drive circuit configured to apply a modulated drive signal to an input of the self-mixing interferometry sensor; a mixer circuit configured to mix a modulated output of the self-mixing interferometry sensor with a local oscillator signal that is orthogonal to the modulated drive signal over a period of time; an integrator circuit configured to integrate an output of the mixer circuit over the period of time; and a processor configured to determine, using an output of the integrator circuit, at least one of a round-trip propagation time of electromagnetic radiation emitted by the self-mixing interferometry sensor and reflected back into the self-mixing interferometry sensor by an object or medium, or a velocity of the object or medium.

    Waveguide-Based Interferometric Multi-Point/Distributed Force and Touch Sensors
    7.
    发明申请
    Waveguide-Based Interferometric Multi-Point/Distributed Force and Touch Sensors 有权

    公开(公告)号：US20210011577A1

    公开(公告)日：2021-01-14

    申请号：US17025872

    申请日：2020-09-18

    Applicant: Apple Inc.

    Inventor： Mehmet Mutlu ,  Tong Chen ,  Mark T. Winkler ,  Omid Momtahan

    IPC: G06F3/042 ,  G02B6/42

    Abstract: Disclosed herein are structures, devices, and systems for detecting touch and force inputs at multiple sensing locations on a surface of an electronic device using waveguide-based interferometry. A laser light source, such as a VCSEL, inserts light into a waveguide positioned adjacent to the sensing locations, and an input at a sensing location alters the inserted light in the waveguide allowing for determination of the input's touch or force at the sensing location. Wavelength modulation of the inserted light allows isolation in frequency of the signals from each sensing location. Optical phase locking can be used to lock an absolute distance beat frequency corresponding to a stationary reference point in the waveguide.

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