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    Optical Beam Forming Device With Crossbar as Beamformer and Its Method of Use
    4.
    发明申请
    Optical Beam Forming Device With Crossbar as Beamformer and Its Method of Use 有权

    公开(公告)号：US20240388819A1

    公开(公告)日：2024-11-21

    申请号：US18635483

    申请日：2024-04-15

    Applicant: ARISTOTLE UNIVERSITY OF THESSALONIKI - E.L.K.E. (Eidikos Logariasmos Kondilion Erevnas)

    Inventor： Nikolaos Pleros ,  Ronis Maximidis ,  Apostolos Tsakyridis ,  Miltiadis Moralis-Pegios ,  Georgios Giamougiannis

    IPC: H04Q11/00 ,  G02B6/35

    Abstract: Optical beamforming device for multiple beams incorporating a universal optical linear crossbar architecture by means whereof the beams are controlled independently in terms of their amplitude and phase, remarkable in that it comprises a photonic crossbar linear optical circuit architecture comprising a coherent multiport interferometer on which it relies; and method for carrying out said device wherein an 1: N splitter (1) followed by N e/o modulators (2) provides N parallel optical signals that get subsequently launched into the Xbar matrix, with every signal entering through a respective waveguide row. Each row employs an optical coupling stage to every matrix column, so that part of the modulated optical signal gets forwarded into the respective column, the remaining part continues to the next column. The intra-column beams are then entering respective Variable Amplitude and Phase (VAP) modulation blocks designed as forming Xbar nodes (4), with each of them comprising an optical amplitude modulator followed by a phase modulator, thus generating the amplitude and phase adjustment of the propagating beam. After exiting the Xbar node, the intra-column optical beams are forced to coherently recombine in a N:1 recombination stage comprising a binary tree of 3 dB-couplers. More specifically, the N signals recombine sequentially in clusters of two at every combination stage until reaching the single waveguide output connected to a radiating element. This leads to the radiation from every i-th column of a sum of N orthogonal modulated amplitude-and phase-adjusted optical sub-signals The over-the-air combination of M radiated signals each consisting of N orthogonal signals leads to the generation of N radiating beams with each beam generated by an algebraic summation of orthogonal modulated sub-signals corresponding to every input port.

    Optoacoustic Fluid Sensing Apparatus
    6.
    发明公开
    Optoacoustic Fluid Sensing Apparatus 审中-公开

    公开(公告)号：US20230408399A1

    公开(公告)日：2023-12-21

    申请号：US18251275

    申请日：2021-10-29

    Applicant: ARISTOTLE UNIVERSITY OF THESSALONIKI - E.L.K.E. ,  HELMHOLTZ ZENTRUM MUNCHEN DEUTSCHES FORSCHUNGSZENTRUM FUR GESUNDHEIT UND UMWELT (GMBH)

    Inventor： Leonidas Ntziachristos ,  Nikolaos Kousias ,  Vasilis Ntziachristos ,  Anastasios Kontses ,  Antonios Stylogiannis

    IPC: G01N21/17 ,  G01N21/31

    CPC classification number: G01N21/171 ,  G01N21/3103 ,  G01N2201/0221 ,  G01N2021/4704

    Abstract: An apparatus for photo-acoustic measurement of a measurement target in a fluid flow comprises:—an ellipsoidal measurement chamber (3) having a first focal point and a second focal point; —a duct (6, 7, 8) configured to guide a fluid flow through the measurement chamber (3) along a first axis (X) through the first focal point; —light source means for generating an excitation light beam of modulated intensity; —means configured to pass the excitation light beam through the measurement chamber (3) along a second axis (Y), which is different from the first axis (X), such that the excitation light beam crosses the fluid flow at the first focal point and that the crossing of the fluid flow and the excitation light beam defines an excitation volume (4) within which the fluid flow is excited by the excitation light beam to generate acoustic waves; and —detecting means (5) arranged at the second focal point and configured to detect said acoustic waves, wherein the detecting means has no direct contact with the fluid flow, and wherein the ellipsoidal measurement chamber has inner walls that are configured to focus the acoustic waves generated by the excitation light beam within the excitation volume (4) onto the detecting means (5).

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