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    Fiber optic hydrophone sensors and uses thereof
    2.
    发明授权
    Fiber optic hydrophone sensors and uses thereof 有权

    公开(公告)号：US10466096B2

    公开(公告)日：2019-11-05

    申请号：US15477247

    申请日：2017-04-03

    Applicant: Drexel University

    Inventor： Mahmoud A. El-Sherif ,  Afshin S. Daryoush ,  Peter A. Lewin ,  Rupa Gopinath Minasamudram

    IPC: G02B6/00 ,  G01H9/00 ,  G01L11/02 ,  G01L11/04 ,  A61B8/00 ,  G02B6/26

    Abstract: A sensing method is based on using a special fiberoptic probe for detection of acoustic/ultrasound pressure in an immersion medium. The developed system is highly sensitive in detecting ultrasound waves up to 100 MHz, for imaging of micro structures and more. For applications up to 100 MHz, without spatial averaging corrections, the probe tip is modified by reducing the fiber diameter to 7 um or less. Also, to maximize acousto-optic interaction, the probe tip, not just its end face, may be coated with a thin layer of metallic material. This thin film coating satisfies partial transparency of the metallic coating. The coating thickness may range from 2 nm to 10 nm or others depending on the type of the coating material. The probe detects the pressure of acoustic and/or ultrasound waves propagating within an immersion medium, whenever the probe tip is immersed inside the medium, and having a reasonable immersion contact surface.

    Highly doped d-shaped fiberoptic probe for hydrophone applications
    3.
    发明授权
    Highly doped d-shaped fiberoptic probe for hydrophone applications 有权

    公开(公告)号：US10883870B2

    公开(公告)日：2021-01-05

    申请号：US16674053

    申请日：2019-11-05

    Applicant: Drexel University

    Inventor： Mahmoud A. El-Sherif ,  Afshin S. Daryoush ,  Peter A. Lewin ,  Rupa Gopinath Minasamudram

    IPC: G02B6/26 ,  G01H9/00

    Abstract: The fiber optic probe detects changes in ultrasound pressure in an immersion medium such as a liquid, a gas, or a solid, where the system includes an optical fiber probe having a fiber of the probe has a highly doped (or regular) core with a diameter in the range 5 to 10 μm and a clad diameter equal to or more than 50 μm; and the optical fiber tip has been modified in a D-shaped (or V-shaped) structure where the clad material has been removed from one side of the cylindrical fiber to the surface of the fiber core; then, this modified region of the fiber is coated, with a very thin layer of a metallic material, ranging from 3 to 10 nm.

    Fiber Optic Hydrophone Sensors and Uses Thereof
    4.
    发明申请
    Fiber Optic Hydrophone Sensors and Uses Thereof 审中-公开

    公开(公告)号：US20170199076A1

    公开(公告)日：2017-07-13

    申请号：US15477247

    申请日：2017-04-03

    Applicant: Drexel University

    Inventor： Mahmoud A. El-Sherif ,  Afshin S. Daryoush ,  Peter A. Lewin ,  Rupa Gopinath Minasamudram

    IPC: G01H9/00 ,  G01L11/04 ,  A61B8/00 ,  G01L11/02

    CPC classification number: G01H9/004 ,  A61B8/4281 ,  A61B2562/0247 ,  A61B2562/0266 ,  G01L11/025 ,  G01L11/04 ,  G02B6/241 ,  G02B6/262

    Abstract: A sensing method is based on using a special fiberoptic probe for detection of acoustic/ultrasound pressure in an immersion medium. The developed system is highly sensitive in detecting ultrasound waves up to 100 MHz, for imaging of micro structures and more. For applications up to 100 MHz, without spatial averaging corrections, the probe tip is modified by reducing the fiber diameter to 7 um or less. Also, to maximize acousto-optic interaction, the probe tip, not just its end face, may be coated with a thin layer of metallic material. This thin film coating satisfies partial transparency of the metallic coating. The coating thickness may range from 2 nm to 10 nm or others depending on the type of the coating material. The probe detects the pressure of acoustic and/or ultrasound waves propagating within an immersion medium, whenever the probe tip is immersed inside the medium, and having a reasonable immersion contact surface.

    INTEGRATED OPTO-ELECTRONIC OSCILLATOR CHIP AS MICROWAVE AND MILLIMETER-WAVE FREQUENCY SYNTHESIZER
    5.
    发明公开
    INTEGRATED OPTO-ELECTRONIC OSCILLATOR CHIP AS MICROWAVE AND MILLIMETER-WAVE FREQUENCY SYNTHESIZER 审中-公开

    公开(公告)号：US20240267001A1

    公开(公告)日：2024-08-08

    申请号：US18567984

    申请日：2022-06-10

    Applicant: Drexel University

    Inventor： Afshin S. Daryoush ,  Kai Wei

    IPC: H03B28/00

    CPC classification number: H03B28/00

    Abstract: In absence of electrical approaches for realization of highly stable RF oscillator, opto-electronic oscillators (OEO) techniques are provided, where self-forced oscillation techniques using long optical delays demonstrate significant short-term and long-term frequency stability. Fully integrated opto-electronic oscillator chip (IOEC) may be the most efficient realization of an RF frequency synthesizer in terms of operation frequency (covering microwave and millimeter wave), size ( 10 dBm from under 1 W power). A free-running III-V (primarily InP) based multi-mode laser (MML) diodes is designed with large mode number (e.g., over 60 modes) and intermodal oscillation frequency compatible with desired RF carrier signal (e.g., 1-40 GHz).

    Fiber Optic Hydrophone Sensors And Uses Thereof
    7.
    发明申请
    Fiber Optic Hydrophone Sensors And Uses Thereof 有权
    光纤水听器传感器及其用途

    公开(公告)号：US20140133280A1

    公开(公告)日：2014-05-15

    申请号：US14159649

    申请日：2014-01-21

    Applicant: Drexel University

    Inventor： Afshin S. Daryoush ,  Peter A. Lewin ,  Rupa Gopinath Minasamudram ,  Mahmoud El-Sherif

    IPC: G01H9/00

    CPC classification number: G01H9/004 ,  G02B6/262

    Abstract: Disclosed is detecting changes in pressure in a medium, with an optical fiber having a core diameter at an immersion surface contact of the fiber of less than 10 μm; a layer of material deposited on said end of the fiber, the material being of a thickness of from about 2 nm to about 10 nm. Also disclosed is detecting pressure waves in a medium comprising: contacting the medium with a fiber optic, the fiber integrated with a light source and a detector, the fiber optic having a diameter of less than 10 μm at an immersion surface contact of the fiber; providing a thin layer of material on the immersion surface contact, wherein said thin layer of material is of a thickness in a range of from about 2 nm to about 10 nm; and detecting Fresnel back reflections from the immersion end of the fiber.

    Abstract translation: 本发明公开了一种介质中的压力变化，纤维的芯径在纤维的浸入面接触小于10μm的光纤; 沉积在纤维的所述端部上的材料层，该材料的厚度为约2nm至约10nm。 还公开了检测介质中的压力波，其包括：使介质与光纤接合，所述光纤与光源和检测器集成，所述光纤在纤维的浸没表面接触处具有小于10μm的直径; 在浸没表面接触处提供薄层材料，其中所述薄层材料的厚度在约2nm至约10nm的范围内; 并从纤维的浸入端检测菲涅尔反射反射。

    Highly doped d-shaped fiberoptic probe for hydrophone applications
    10.
    发明申请
    Highly doped d-shaped fiberoptic probe for hydrophone applications 审中-公开

    公开(公告)号：US20200080887A1

    公开(公告)日：2020-03-12

    申请号：US16674053

    申请日：2019-11-05

    Applicant: Drexel University

    Inventor： Mahmoud A. El-Sherif ,  Afshin S. Daryoush ,  Peter A. Lewin ,  Rupa Gopinath Minasamudram

    IPC: G01H9/00

    Abstract: The fiber optic probe detects changes in ultrasound pressure in an immersion medium such as a liquid, a gas, or a solid, where the system includes an optical fiber probe having a fiber of the probe has a highly doped (or regular) core with a diameter in the range 5 to 10 μm and a clad diameter equal to or more than 50 μm; and the optical fiber tip has been modified in a D-shaped (or V-shaped) structure where the clad material has been removed from one side of the cylindrical fiber to the surface of the fiber core; then, this modified region of the fiber is coated, with a very thin layer of a metallic material, ranging from 3 to 10 nm.

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