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    Method and apparatus for determining the absolute value of the flow velocity of a particle-transporting medium
    1.
    发明授权
    Method and apparatus for determining the absolute value of the flow velocity of a particle-transporting medium 有权

    公开(公告)号：US11543273B2

    公开(公告)日：2023-01-03

    申请号：US16718545

    申请日：2019-12-18

    Applicant: Robert Bosch GmbH ,  Trumpf Photonic Components GmbH

    Inventor： Alexander Van Der Lee ,  Robert Weiss ,  Hans Spruit

    IPC: G01F1/661 ,  G01F1/66

    Abstract: The invention relates to a method for determining the absolute value of the flow velocity (v) of a particle-transporting medium. At least two measurement laser beams (L_i) with linearly independent, non-orthogonal measurement directions (b_i) are emitted. The measurement laser beams (L_i) scattered at particles are detected and one measurement signal (m_i) is generated in each case for each measurement laser beam (L_i). The measurement signals (m_i) are evaluated, wherein absolute values of velocity components (v_i) are ascertained as projections of the flow velocity (v) on the respective measurement directions (b_i), wherein a solid angle region is ascertained for the prevalent direction of the flow velocity (v) and signs assigned to this solid angle region are chosen for the individual velocity components (v_i), and wherein the absolute value of the flow velocity (v) is determined using the ascertained absolute values of the velocity components (v_i) and using the chosen signs for the velocity components (v_i).

    METHOD OF REDUCING FALSE-POSITIVE PARTICLE COUNTS OF AN INTERFERENCE PARTICLE SENSOR MODULE
    2.
    发明申请
    METHOD OF REDUCING FALSE-POSITIVE PARTICLE COUNTS OF AN INTERFERENCE PARTICLE SENSOR MODULE 有权

    公开(公告)号：US20210116355A1

    公开(公告)日：2021-04-22

    申请号：US17128503

    申请日：2020-12-21

    Applicant: Robert Bosch GmbH ,  TRUMPF Photonic Components GmbH

    Inventor： Hans Spruit ,  Alexander Van der Lee ,  Philipp Henning Gerlach ,  Robert Wolf ,  Robert Weiss ,  Matthias Falk

    IPC: G01N15/14 ,  H01S5/183

    Abstract: A method reduces false-positive particle counts detected by an interference particle sensor module, which has a laser and a light detector. The method including: emitting laser light; providing a high-frequency signal during the emission of the laser light, a modulation frequency of the high-frequency signal being between 10-500 MHz; detecting an optical response by the light detector in reaction to the emitted laser light while providing the high-frequency signal, which is arranged such that a detection signal caused by a macroscopic object positioned between a first and second distance is reduced in comparison to a detection signal caused by the macroscopic object at the same position without providing the high-frequency signal. The high-frequency signal is provided to a tuning structure of the particle sensor module which is arranged to modify a resonance frequency of an optical resonator comprised by the laser sensor module upon reception of the high-frequency signal.

    Optical Particle Sensor Device and Method for Operating an Optical Particle Sensor Device
    3.
    发明申请
    Optical Particle Sensor Device and Method for Operating an Optical Particle Sensor Device 审中-公开

    公开(公告)号：US20200056981A1

    公开(公告)日：2020-02-20

    申请号：US16541675

    申请日：2019-08-15

    Applicant: Robert Bosch GmbH ,  TRUMPF Photonic Components GmbH

    Inventor： Alexander Van Der Lee ,  Robert Weiss ,  Sören Sofke ,  Hans Spruit ,  Jens-Alrik Adrian

    IPC: G01N15/14 ,  G01N15/02

    Abstract: The invention relates to an optical particle sensor device (1), comprising an optical emitter device (2), which is designed to emit a multitude N of measurement laser beams (Li) into a vicinity of the optical particle sensor device (1); a detector device (3), which is designed to detect the measurement laser beams (Li) scattered on particles in the vicinity of the optical particle sensor device (1) and to generate to generate a single measuring signal (Ei) assigned to this for each measurement laser beam (Li); and an evaluation device (4), which is designed to determine at least one estimated particle value for the number of particles per volume using at least one single measurement signal (Ei). The evaluation device (4) is designed to determine at least two estimated particle values for the number of particles per volume, which are based on at least partially different single measurement signals (Ei) and/or a different number of single measurement signals (Ei), and on the basis of at least part of the estimated particle values, to determine at least one output value for the particle load.

    DEVICE FOR PRODUCING A LIGHT BARRIER
    4.
    发明申请
    DEVICE FOR PRODUCING A LIGHT BARRIER 有权

    公开(公告)号：US20250035812A1

    公开(公告)日：2025-01-30

    申请号：US18918138

    申请日：2024-10-17

    Applicant: TRUMPF Photonic Components GmbH

    Inventor： Holger Joachim Mönch ,  Sven Bader ,  Jochen Hellmig ,  Hans Spruit ,  Pieter Hoeven ,  Stephan Gronenborn

    IPC: G01V8/22 ,  H01S5/026 ,  H01S5/183

    Abstract: A device for producing a light barrier includes a laser unit with at least one vertical cavity surface emitting laser (VCSEL), a photodiode, and a reflector. The reflector is configured to reflect light emitted by the VCSEL, such that a light reflection produced as a result is received by the photodiode, producing a detection signal, from which a direct current signal component is subtracted so that an alternating current component is provided as an evaluation signal. The evaluation signal has a higher signal-to-noise ratio than the detection signal, such that an evaluation device connected to the VCSEL is able to detect an interruption of the light reflection if no self-mixing interference is present.

    Method for operating a pair of smart glasses
    5.
    发明授权
    Method for operating a pair of smart glasses 有权

    公开(公告)号：US11513594B2

    公开(公告)日：2022-11-29

    申请号：US17336849

    申请日：2021-06-02

    Applicant: Robert Bosch GmbH ,  TRUMPF Photonic Components GmbH

    Inventor： Andreas Petersen ,  Thomas Alexander Schlebusch ,  Johannes Meyer ,  Hans Spruit ,  Jochen Hellmig

    IPC: G06F3/01 ,  G02C11/00

    Abstract: A method for operating smart glasses includes an input unit and/or output unit and a gaze detection arrangement, wherein the gaze detection arrangement detects any eye movement of an eye including the steps of irradiating at least one wavelength-modulated laser beam to the eye, detecting an optical path length of the emitted laser beam based on laser feedback interferometry of the emitted laser radiation with backscattered radiation from the eye, detecting a Doppler shift of the emitted and backscattered radiation based on the laser feedback interferometry, and detecting an eye velocity based on the Doppler shift, and wherein the input unit and/or output unit is operated based on the optical path length and/or the eye velocity.

    LASER SENSOR, SYSTEM AND METHOD FOR SELF-MIXING INTERFEROMETRY
    8.
    发明申请
    LASER SENSOR, SYSTEM AND METHOD FOR SELF-MIXING INTERFEROMETRY 有权

    公开(公告)号：US20220349703A1

    公开(公告)日：2022-11-03

    申请号：US17730220

    申请日：2022-04-27

    Applicant: TRUMPF Photonic Components GmbH ,  Robert Bosch GmbH

    Inventor： Hans Spruit ,  Jochen Hellmig ,  Stephan Gronenborn ,  Johannes Meyer ,  Andreas Petersen ,  Thomas Schlebusch

    IPC: G01B9/02 ,  G01S7/4912 ,  H01S5/00

    Abstract: A laser sensor includes a laser source configured to emit a laser beam, and optics configured to project the laser beam as a one- or two-dimensional patterned laser beam onto an object to be examined, such that a distance of the patterned laser beam from the laser source varies along the patterned laser beam projected on the object. The laser sensor further includes a detector configured to determine a self-mixing interference signal generated by laser light of the patterned laser beam reflected from the object back into the laser source, and circuitry configured to analyze a spectrum of the self-mixing interference signal and extract from the spectrum of the self-mixing interference signal multiple frequencies that are indicative of at least one of the following: multiple distances along the patterned laser beam from the laser source, or multiple velocities along the patterned laser beam with respect to the laser source.

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