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    Phase lock loop circuit based signal generation in an optical measurement system
    2.
    发明授权
    Phase lock loop circuit based signal generation in an optical measurement system 有权

    公开(公告)号：US11575382B2

    公开(公告)日：2023-02-07

    申请号：US17559774

    申请日：2021-12-22

    申请人： HI LLC

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

    IPC分类号： H03L7/08 ,  H03L7/197 ,  H03L7/18 ,  H03L7/099 ,  G02B27/01 ,  H03L7/089

    摘要： An exemplary system includes a PLL circuit and a precision timing circuit connected to the PLL circuit. The PLL circuit has a PLL feedback period defined by a reference clock and includes a voltage controlled oscillator configured to lock to the reference clock and having a plurality of stages configured to output a plurality of fine phase signals each having a different phase, and a feedback divider configured to be clocked by a single fine phase signal included in the plurality of fine phase signals and have a plurality of feedback divider states during the PLL feedback period. The precision timing circuit is configured to generate a timing pulse and set, based on a first combination of one of the fine phase signals and one of the feedback divider states, a temporal position of the timing pulse within the PLL feedback period.

    Maintaining Consistent Photodetector Sensitivity in an Optical Measurement System
    3.
    发明申请
    Maintaining Consistent Photodetector Sensitivity in an Optical Measurement System 有权

    公开(公告)号：US20210290068A1

    公开(公告)日：2021-09-23

    申请号：US17202563

    申请日：2021-03-16

    申请人： HI LLC

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

    IPC分类号： A61B5/00

    摘要： An exemplary optical measurement system includes a light source configured to emit light directed at a target. The optical measurement system further includes a photodetector configured to detect a photon of the light after the light is scattered by the target. The optical measurement system further includes a control circuit configured to receive a first input voltage that is a temperature-dependent voltage. The control circuit is further configured to receive a second input voltage that is a temperature-invariant voltage. The control circuit is further configured to output, based on a combination of the first input voltage and the second input voltage, a bias voltage for the photodetector, wherein the combination of the first and second input voltages is configured to cause the bias voltage to vary based on temperature.

    Photodetector Calibration of an Optical Measurement System
    6.
    发明公开
    Photodetector Calibration of an Optical Measurement System 审中-公开

    公开(公告)号：US20240099587A1

    公开(公告)日：2024-03-28

    申请号：US18524743

    申请日：2023-11-30

    申请人： HI LLC

    发明人： Sebastian Sorgenfrei ,  Ryan Field ,  Bruno Do Valle ,  Isai Olvera ,  Jacob Dahle ,  Husam Katnani

    IPC分类号： A61B5/00

    CPC分类号： A61B5/0082 ,  A61B5/4064 ,  A61B5/6803 ,  A61B5/7217 ,  A61B2560/0223 ,  A61B2560/0443 ,  A61B2562/046

    摘要： An illustrative optical measurement system includes a light source configured to emit light directed at a target, an array of photodetectors configured to detect photons of the light after the light is scattered by the target, and a processing unit configured to measure a noise level of a photodetector included in the array of photodetectors, the noise level comprising a dark count rate that measures a dark count divided by a time period, determine that the noise level meets a predetermined threshold comprising a dark count rate threshold, and prevent, based on the determining that the noise level meets the predetermined threshold, an output of the photodetector from being used in generating a histogram based on a temporal distribution of photons detected by the array of photodetectors, the preventing comprising switching the output to a monitoring circuit that monitors a characteristic of the optical measurement system separate from the photodetector.

    Maintaining Consistent Photodetector Sensitivity in an Optical Measurement System
    7.
    发明公开
    Maintaining Consistent Photodetector Sensitivity in an Optical Measurement System 审中-公开

    公开(公告)号：US20240032798A1

    公开(公告)日：2024-02-01

    申请号：US18379516

    申请日：2023-10-12

    申请人： HI LLC

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

    IPC分类号： A61B5/00

    CPC分类号： A61B5/0082 ,  A61B5/0073 ,  A61B5/0075 ,  A61B5/4064 ,  A61B5/6803 ,  A61B2560/0214

    摘要： An illustrative optical measurement system includes a light source configured to emit light directed at a target. The optical measurement system further includes a photodetector configured to detect a photon of the light after the light is scattered by the target. The optical measurement system further includes a control circuit configured to receive a first input voltage that is a temperature-dependent voltage. The control circuit is further configured to receive a second input voltage that is a temperature-invariant voltage. The control circuit is further configured to output, based on a combination of the first input voltage and the second input voltage, a bias voltage for the photodetector, wherein the combination of the first and second input voltages is configured to cause the bias voltage to vary based on temperature.

    Phase Lock Loop Circuit Based Adjustment of a Measurement Time Window in an Optical Measurement System
    9.
    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

    申请人： HI LLC

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

    IPC分类号： G06K7/10 ,  G02B27/01

    摘要： 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.