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    INTERFEROMETRIC PARALLEL DETECTION USING DIGITAL RECTIFICATION AND INTEGRATION
    51.
    发明申请
    INTERFEROMETRIC PARALLEL DETECTION USING DIGITAL RECTIFICATION AND INTEGRATION 有权

    公开(公告)号：US20210341280A1

    公开(公告)日：2021-11-04

    申请号：US17342493

    申请日：2021-06-08

    Applicant: HI LLC

    Inventor： Hooman Mohseni ,  Haowen Ruan ,  Sebastian Sorgenfrei ,  Ryan Field

    IPC: G01B9/02

    Abstract: The source light having a range of optical wavelengths is split into sample light and reference light. The sample light is delivered into a sample, such that the sample light is scattered by the sample, resulting in signal light that exits the sample. The signal light and the reference light are combined into an interference light pattern having optical modes having oscillation frequency components respectively corresponding to optical pathlengths extending through the sample. Different sets of the optical modes of the interference light pattern are respectively detected, and high-bandwidth analog signals representative of the optical modes of the interference light pattern are output. The high-bandwidth analog signals are parallel processed, and mid-bandwidth digital signals are output. The mid-bandwidth digital signals are processed over an i number of iterations, and a plurality of low-bandwidth digital signals are output on the ith iteration. The sample is analyzed based on the low-bandwidth digital signals.

    Phase Lock Loop Circuit Based Adjustment of a Measurement Time Window in an Optical Measurement System
    52.
    发明申请
    Phase Lock Loop Circuit Based Adjustment of a Measurement Time Window in an Optical Measurement System 有权

    公开(公告)号：US20210294996A1

    公开(公告)日：2021-09-23

    申请号：US17202572

    申请日：2021-03-16

    Applicant: HI LLC

    Inventor： Ryan Field ,  Jacob Dahle ,  Rong Jin ,  Bruno Do Valle ,  Sebastian Sorgenfrei

    IPC: G06K7/10 ,  G02B27/01

    Abstract: An exemplary system includes a photodetector configured to generate a photodetector output pulse when the photodetector detects a photon from a light pulse having a light pulse time period, a TDC configured to monitor for the occurrence of the photodetector output pulse during a measurement time window that is within and shorter in duration than the light pulse time period, a PLL circuit for the TDC, and a precision timing circuit connected to the PLL circuit and configured to adjust, based on at least one signal generated within the PLL circuit, a temporal position of the measurement time window within the light pulse time period.

    Detection of Motion Artifacts in Signals Output by Detectors of a Wearable Optical Measurement System
    53.
    发明申请
    Detection of Motion Artifacts in Signals Output by Detectors of a Wearable Optical Measurement System 有权

    公开(公告)号：US20210290170A1

    公开(公告)日：2021-09-23

    申请号：US17202631

    申请日：2021-03-16

    Applicant: HI LLC

    Inventor： Katherine Perdue ,  Ryan Field ,  Husam Katnani ,  Jennifer Rines ,  Alejandro Ojeda

    IPC: A61B5/00

    Abstract: An illustrative system includes a wearable assembly configured to be worn by a user and comprising a first detector configured to detect a first set of photon arrival times and output a first signal representative of the first set of photon arrival times, and a second detector configured to detect a second set of photon arrival times and output a second signal representative of the second set of photon arrival times. The system further includes a processing unit configured to identify a first intensity change in the first signal, identify a second intensity change in the second signal, determine that the first and second intensity changes are time correlated, and determine, based on the determining that the first and second intensity changes are time correlated, that the first and second intensity changes are representative of a motion artifact caused by movement of the user.

    Dynamic Range Optimization in an Optical Measurement System
    55.
    发明申请
    Dynamic Range Optimization in an Optical Measurement System 有权

    公开(公告)号：US20210290066A1

    公开(公告)日：2021-09-23

    申请号：US17202651

    申请日：2021-03-16

    Applicant: HI LLC

    Inventor： Ryan Field ,  Bruno Do Valle ,  Jacob Dahle

    IPC: A61B5/00 ,  G01J1/42 ,  G01J1/44 ,  G04F10/00

    Abstract: An illustrative optical measurement system includes a light source configured to emit, during a measurement session time period, a sequence of light pulses towards a target; a plurality of photodetectors configured to remain in an armed state during an entire duration of the measurement session time period, and detect, while in the armed state, photons of the light pulses after the light pulses are scattered by the target; and a plurality of time-to-digital converters (TDCs) comprising a different TDC for each photodetector of the plurality of photodetectors, the TDCs configured to record timestamp symbols representative of when the photons are detected by the photodetectors.

    MULTIPLEXING TECHNIQUES FOR INTERFERENCE REDUCTION IN TIME-CORRELATED SINGLE PHOTON COUNTING
    57.
    发明申请
    MULTIPLEXING TECHNIQUES FOR INTERFERENCE REDUCTION IN TIME-CORRELATED SINGLE PHOTON COUNTING 有权

    公开(公告)号：US20210259583A1

    公开(公告)日：2021-08-26

    申请号：US17176307

    申请日：2021-02-16

    Applicant: HI LLC

    Inventor： Sebastian Sorgenfrei ,  Ryan Field ,  Katherine Perdue ,  Jacob Dahle

    IPC: A61B5/1455 ,  A61B5/00

    Abstract: An optical measurement system includes a first wearable module comprising a first source configured to emit a first light pulse sequence comprising a plurality of light pulses and a first plurality of detectors configured to detect photons from the first light pulse sequence. The system further includes a second wearable module comprising a second source configured to emit a second light pulse sequence comprising a plurality of light pulses and that is time interleaved with the first light pulse sequence, and a second plurality of detectors configured to detect photons from the second light pulse sequence. The system further includes a control circuit configured to control light pulses emitted by the sources in accordance with time and/or frequency division multiplexing heuristics.

    ESTIMATION OF SOURCE-DETECTOR SEPARATION IN AN OPTICAL MEASUREMENT SYSTEM
    58.
    发明申请
    ESTIMATION OF SOURCE-DETECTOR SEPARATION IN AN OPTICAL MEASUREMENT SYSTEM 有权

    公开(公告)号：US20210259554A1

    公开(公告)日：2021-08-26

    申请号：US17176448

    申请日：2021-02-16

    Applicant: HI LLC

    Inventor： Ryan Field ,  Katherine Perdue ,  Hamid Dehghani

    IPC: A61B5/00 ,  G01B11/14

    Abstract: An optical measurement system includes a first light source configured to emit a first light pulse toward a target, a second light source configured to emit a second light pulse toward the target, a first detector, a second detector, and a processing unit. The processing unit is configured to determine a plurality of temporal distributions of photons included in the first light pulse and the second light pulse and detected by the first detector and the second detector after the photons are scattered by the target. The processing unit is further configured to determine, based on the plurality of temporal distributions, a distance between the first light source and the second detector.

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