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    RELIABLE OPTICAL TRANSIT TIME METHOD FOR DETERMINING DISTANCE VALUES
    1.
    发明申请
    RELIABLE OPTICAL TRANSIT TIME METHOD FOR DETERMINING DISTANCE VALUES 有权

    公开(公告)号：US20250052899A1

    公开(公告)日：2025-02-13

    申请号：US18722532

    申请日：2022-12-06

    Applicant: K.A. Schmersal Holding GmbH & Co. KG

    Inventor： Christian UHLENBROCK ,  Johannes NEIDHART ,  Yu-Ru HUANG ,  Sheldon Heng Wei CHANG

    IPC: G01S17/36 ,  G01S17/04 ,  G01S17/894 ,  G01S17/931

    Abstract: In a method and an optical time-of-flight sensor for determining distance values d, di by an optical time-of-flight method, an illumination light 40 is emitted which is modulated with a modulation frequency f and a modulation phase q. Reflected light 42 is acquired as an output signal Rx and evaluated by acquisition of a phase shift δ between the illumination light 40 and the reflected light 42, so that an output signal d, di with at least one distance value d is generated. Distance values d, di are determined for a sequence of successive frames, with a plurality of acquisitions being made in each frame in the form of micro-frames μF1-μF8 with different modulation phases φ. A sequence of modulation phases φ1-φ4 of the micro-frames μF1-μF8 is specified for each frame. In order to achieve a particularly high reliability of the data supplied, the order of the modulation phases φ1-φ4 changes. A self-calibration and self-verification take place in an initialization step (60). The subsequent data acquisition takes place in frame acquisition steps 62 with acquisition of signals and calculation and output of the distance values for each pixel for subsequent processing (68). Each step (62) in the acquisition of a frame is divided into a setup step (64) and a subsequent acquisition of signals in micro-frames μF1-μF8. In setup step (64), the central processing unit MCU calculates (pseudo-)random numbers and uses these to determine the order of the micro-frames μF1-μF8, i.e. the respective modulation frequencies f and phase angles φ. Optical time-of-flight methods, in which the acquisition and signal evaluation are carried out with a variable order of modulation phases, are thus particularly suitable for safety-related applications, e.g. as optical area monitoring systems for industrial production facilities.

    Time of flight sensors and sensing methods
    3.
    发明授权
    Time of flight sensors and sensing methods 有权

    公开(公告)号：US12164063B2

    公开(公告)日：2024-12-10

    申请号：US17861238

    申请日：2022-07-10

    Applicant: Maxim Integrated Products, Inc.

    Inventor： Arvin Emadi ,  Charles J. Razzell ,  John P. Hanks

    IPC: G01C3/08 ,  G01S7/4913 ,  G01S7/4915 ,  G01S17/36

    Abstract: A time of flight sensor includes a time of flight (TOF) processor having a digital TOF port, a digital input port, and a digital output port, the TOF processor comprising a phase detector including cyclically rotating demultiplexer (DEMUX), a first summer coupled to a first DEMUX output, a second summer coupled to a second DEMUX output, a third summer coupled to a third DEMUX output, a fourth summer coupled to a fourth DEMUX output, and a phase estimator coupled to outputs of the first summer, the second summer, the third summer and the fourth summer and having a phase estimate output; a driver having a digital driver port coupled to the digital TOF port and a driver output port; and an analog-to-digital converter (ADC) having an output port coupled to the digital input port of the digital TOF processor.

    DETECTION METHOD AND DETECTION SYSTEM FOR ACQUIRING DISTANCE INFORMATION
    9.
    发明公开
    DETECTION METHOD AND DETECTION SYSTEM FOR ACQUIRING DISTANCE INFORMATION 审中-公开

    公开(公告)号：US20240103144A1

    公开(公告)日：2024-03-28

    申请号：US18274245

    申请日：2021-12-22

    Applicant: Ningbo ABAX Sensing Electronic Technology Co., Ltd.

    Inventor： Shuyu LEI

    IPC: G01S7/4915 ,  G01S7/481 ,  G01S17/36

    CPC classification number: G01S7/4915 ,  G01S7/4815 ,  G01S17/36

    Abstract: The disclosure provides a detection method for acquiring distance information, which is performed by a distance detection system including a light emitting module, a processing module and a light receiving module; the detection method including: the light emitting module emits light signals with different emitted frequencies; the light receiving module obtains returned light signal which is the emitted light reflected by detected object in the field of view, and converts the returned light signal into electrical signal; and the processing module acquires the distance information of the detected object according to the electrical signal converted from the returned light signal acquired by the receiving module, wherein the processing module includes at least two sets of conversion relationships for calculating the distance information from the electrical signal, the processing module acquires the distance information of the detected object according to one of the conversion relationships.

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