公开(公告)号：US12259361B2

公开(公告)日：2025-03-25

申请号：US17800322

申请日：2021-02-15

Applicant: IMEC VZW ,  Universiteit Gent

Inventor： YanLu Li ,  Roeland Baets

IPC: G01N29/24 ,  G01N29/46

Abstract: The disclosure includes a system for photoacoustic inspection of an object. The system includes a broadband emission source configured to generate an emission beam, a direction apparatus including at least one spectrum splitter configured to split the emission beam into at least a first and a second component, the direction apparatus being configured to sequentially direct the respective components to N respective locations on the object at N times to generate N respective acoustic waves within the object. The N respective locations and N times are such that the respective N acoustic waves at least semi-constructively interfere to generate a respective propagating acoustic wave within the object. The system also includes a vibration sensing system configured to detect said respective propagating acoustic waves at a respective detection location on the object.

公开(公告)号：US20240168223A1

公开(公告)日：2024-05-23

申请号：US18388960

申请日：2023-11-13

Applicant: IMEC VZW ,  Universiteit Gent

Inventor： Emiel Dieussaert ,  YanLu Li ,  Roeland Baets

IPC: G02B6/12

CPC classification number: G02B6/12011 ,  G02B6/12019 ,  G02B2006/12142 ,  G02B2006/12147

Abstract: According to an aspect of the present inventive concept there is provided a photonic integrated circuit, PIC, comprising a waveguide array. Each waveguide is configured to guide a light signal. All guided light signals originate from a common light beam or multiple mutually coherent light beams.
Each waveguide is associated with a mutually unique modulator, providing modulation, by a modulation signal, of phase and/or amplitude of the light signal, forming a modulated light signal. The modulation signals of all modulators have a common modulation period, such that the modulated light signal comprises a plurality of sideband frequencies representing different orders of frequency shifts based on harmonics of the modulation period.
A free propagation unit comprising inputs associated with the waveguides receives the modulated light signals. The modulated light signals propagate freely in two spatial dimensions through the free propagation unit and interfere to form output signals. Different outputs of the free propagation unit receive light with different peak frequency corresponding to different sideband frequencies.

公开(公告)号：US09770196B2

公开(公告)日：2017-09-26

申请号：US14091645

申请日：2013-11-27

Applicant: UNIVERSITEIT GENT

Inventor： Roeland Baets ,  Eva Ryckeboer

IPC: A61B5/145 ,  A61B5/1459 ,  G01N21/03 ,  G01N21/27 ,  A61B5/15 ,  A61B5/157 ,  B01L3/00

CPC classification number: A61B5/14532 ,  A61B5/14503 ,  A61B5/1459 ,  A61B5/150022 ,  A61B5/157 ,  A61B2562/04 ,  B01L3/5027 ,  G01N21/03 ,  G01N21/274 ,  G01N2201/0662

Abstract: A sensing system and method for sensing a component in a liquid is disclosed. The system comprises a microfluidic channel, the microfluidic channel comprising a first end and a second end, wherein the microfluidic channel is open at the first end and closed at the second end. The system also comprises at least one measurement sensor positioned adjacent the first end, the measurement sensor being arranged for detecting a measurement signal and a reference sensor positioned in the microfluidic channel adjacent the second end, the reference sensor being arranged for detecting a reference signal of the liquid. The system further is configured for combining the measurement signal and the reference signal so as to filter out background influences.

公开(公告)号：US12018984B2

公开(公告)日：2024-06-25

申请号：US17776032

申请日：2020-11-18

Applicant: UNIVERSITEIT GENT ,  IMEC VZW

Inventor： Fabio Pavanello ,  Dries Van Thourhout ,  Roeland Baets

IPC: G01J3/28 ,  G01J3/02 ,  G01J3/12

CPC classification number: G01J3/0294 ,  G01J3/12 ,  G01J3/28 ,  G01J2003/1213 ,  G01J2003/2879

Abstract: A temperature compensation method for wavelength monitoring using spectrometers on photonic integrated chips and a related temperature-compensated wavelength monitoring device include an optical filter of the chip filters a source signal to provide at least one spectral reference line to a first spectrometer to detect thermal wavelength drifts thereof. At least one spectral line to be monitored is received by the same or another spectrometer of the chip to detect wavelength shifts thereof. The detected thermal drift of the reference line is compared to calibrated thermal drifts for the reference line which is associated with a calibrated thermal drift for the spectral response curve of the spectrometer receiving the spectral line to be monitored. A thermal drift rate for the response curve of the optical filter differs from a thermal drift rate for the response curve of the first spectrometer at least by an amount.

公开(公告)号：US20220214456A1

公开(公告)日：2022-07-07

申请号：US17604950

申请日：2020-05-04

Applicant: Imec vzw ,  Universiteit Gent

Inventor： YanLu Li ,  Roeland Baets

IPC: G01S17/58 ,  G01S7/4915 ,  G01S7/481

Abstract: Example embodiments relate to phase difference detection systems and method for detecting phase difference. One embodiment includes a phase difference detection system for a single target location. The system includes a laser source to generate a laser beam. The system also includes a phase difference detector coupled to the laser source and having a multi-layer structure. The phase difference detector includes a planar waveguide for guiding the laser beam. The phase difference detector also includes a grating coupler to split the laser beam into a reference beam and a measurement beam. Additionally, the phase detector includes a planar imager array forming a second layer of the multi-layer structure. Further, the phase difference detector includes an optical system configured to focus the measurement beam output from the phase difference detector on the single target location and to focus signals reflected at the target location to the phase difference detector.

公开(公告)号：US20220196804A1

公开(公告)日：2022-06-23

申请号：US17603729

申请日：2020-04-15

Applicant: Imec vzw ,  Universiteit Gent

Inventor： YanLu Li ,  Roeland Baets

IPC: G01S7/481 ,  G01S17/58

Abstract: Example embodiments relate to photonic integrated circuits (PICs) and three-dimensional (3D) laser Doppler vibrometers (LDVs) including the same. One embodiment includes a PIC for a 3D LDV. The PIC includes a splitter to split a laser beam into a measurement signal and a reference signal. The PIC also includes a phase-amplitude modulator array coupled to a transmitting array to generate, from the measurement signal, n output signals to be directed to a single target location and output from substantially a single location. Each output signal has a different direction and carrier frequency. The PIC further includes a receiving array having m receiving antennas. Each receiving antenna is configured to receive a reflection signal from a different receiving direction. Each reflection signal is indicative of the output signals reflected at the single target location. M and N are natural numbers greater than or equal to three.

公开(公告)号：US20230067864A1

公开(公告)日：2023-03-02

申请号：US17800322

申请日：2021-02-15

Applicant: IMEC VZW ,  Universiteit Gent

Inventor： YanLu Li ,  Roeland Baets

IPC: G01N29/24 ,  G01N29/46

Abstract: The disclosure includes a system for photoacoustic inspection of an object. The system includes a broadband emission source configured to generate an emission beam, a direction apparatus including at least one spectrum splitter configured to split the emission beam into at least a first and a second component, the direction apparatus being configured to sequentially direct the respective components to N respective locations on the object at N times to generate N respective acoustic waves within the object. The N respective locations and N times are such that the respective N acoustic waves at least semi-constructively interfere to generate a respective propagating acoustic wave within the object. The system also includes a vibration sensing system configured to detect said respective propagating acoustic waves at a respective detection location on the object.

公开(公告)号：US20190271854A1

公开(公告)日：2019-09-05

申请号：US16290041

申请日：2019-03-01

Applicant: IMEC VZW ,  Universiteit Gent

Inventor： YanLu Li ,  Roeland Baets ,  Eva Ryckeboer ,  Jinghao Zhu

IPC: G02B27/48 ,  G01B9/02 ,  G01H9/00 ,  G01P5/26

Abstract: Described herein is a method and system for mitigating the effects of speckle in a laser Doppler system, and, in particular in a laser Doppler vibrometry/velocimetry system. A scan unit is provided in at least one of: a transmit path for scanning at least one beam from a transmitting antenna over a moving target surface and a receive path for scanning at least one reflected beam received from the moving target surface onto a receiving antenna. An averaging unit is provided prior to post-processing or demodulation to average electrical signals corresponding to the reflected beams. By averaging before demodulation, speckle in the output signal is mitigated.

公开(公告)号：US10338313B2

公开(公告)日：2019-07-02

申请号：US15753700

申请日：2016-08-22

Applicant: UNIVERSITEIT GENT ,  IMEC VZW

Inventor： Roeland Baets ,  Günther Roelkens ,  Andreas De Groote ,  Paolo Cardile ,  Ananth Subramanian

IPC: G02B6/12 ,  G02B6/122 ,  H01L33/00 ,  H01L33/58 ,  H01L33/30 ,  H01S5/026 ,  G02B6/13

Abstract: An on-chip broadband radiation source, and methods for its manufacture such that a photonics IC comprises an optical waveguide such as a semiconductor waveguide, a thin III-V material membrane with absorption capability for absorbing an optical pump signal induced in the waveguide. The III-V membrane comprises a LED implemented therein. The photonics IC also comprises a coupling means between the waveguide and the membrane. The device provides a broadband radiation source at a wavelength longer than the wavelength of the transferred radiation. The broadband signal can then be coupled out through the waveguide and used in the chip.

公开(公告)号：US10036625B2

公开(公告)日：2018-07-31

申请号：US15305713

申请日：2015-04-23

Applicant: UNIVERSITEIT GENT ,  IMEC VZW

Inventor： Roeland Baets ,  Danaë Delbeke ,  Günther Roelkens ,  Wim Bogaerts

IPC: G01J3/28 ,  G01B9/02 ,  G01J3/02 ,  G01J3/18 ,  G01J3/32 ,  G01J3/433 ,  G01N21/35 ,  G02B6/12

CPC classification number: G01B9/02051 ,  G01B9/02044 ,  G01J3/0218 ,  G01J3/0256 ,  G01J3/0259 ,  G01J3/18 ,  G01J3/1895 ,  G01J3/32 ,  G01J3/433 ,  G01N21/35 ,  G02B6/12019

Abstract: An integrated waveguide based spectrometer is described. The spectrometer comprises a sensing region for receiving multi-wavelength radiation for irradiating a sample in the sensing region, a wavelength demultiplexing element arranged for capturing said multi-wavelength radiation after interaction with the sample and for providing a number of wavelength demultiplexed radiation outputs or a number of different groups of wavelength demultiplexed radiation outputs, an integrated modulator for differently modulating the different demultiplexed radiation outputs or different groups of demultiplexed radiation outputs, and a multiplexer element for multiplexing the differently modulated demultiplexed radiation outputs or the differently grouped demultiplexed radiation outputs.