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公开(公告)号：US20220301541A1
公开(公告)日：2022-09-22
申请号：US17619938
申请日：2020-06-22
摘要： A method and system for controlling an array of piezoelectric transducers (11, 12, 13). Respective driving signals (Vn) are applied to the transducers. The driving signals (Vn) comprise an alternating component (A) oscillating at one or more driving frequencies to cause corresponding vibrations in the transducers for generating acoustic waves (Wn). One or more of the driving signals (Vn) are offset by a respective bias voltage (Bn). The bias voltage (Bn) is controlled to reduce a difference in resonance frequencies between the transducers. To eliminate any remaining difference, the alternating component (A) to at least a subset of the transducers (11,12) is periodically reset. In this way the phases of the resulting acoustic waves (W1,W2) can be synchronized.
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公开(公告)号：US20220026251A1
公开(公告)日：2022-01-27
申请号：US17413350
申请日：2019-12-16
发明人： Gert-Jan Adriaan VAN GROENESTIJN , Paul Louis Maria Joseph VAN NEER , Fokko Pieter WIERINGA , Arno Willem Frederik VOLKER , Lun Kai CHENG
IPC分类号： G01F1/66
摘要： Ultrasonic measurements of fluid properties are performed with the aid of an optical fiber or a package of optical fibers by exciting ultrasound waves at a first location along the optical fiber in the fluid by means of light from the optical fiber and detecting an effect of the ultrasound waves on light reflection or propagation in the optical fiber and/or a further optical fiber in the package at a second location along the optical fiber or at the end of the optical fiber.
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公开(公告)号：US20230347381A1
公开(公告)日：2023-11-02
申请号：US17796467
申请日：2021-02-02
发明人： Paul Louis Maria Joseph VAN NEER , Arno Willem Frederik VOLKER , Gerwin Hermanus GELINCK , Hylke Broer AKKERMAN , Antonius Maria Bernardus VAN MOL
CPC分类号： B06B1/0611 , B06B1/0215 , B06B1/0292 , B06B2201/20 , B06B2201/51 , B06B2201/55
摘要： An ultrasonic transducer is described that includes a stack of at least two membranes attached to a substrate. An electric circuit is coupled to the electrodes with a controller configured to apply a first electric signal to a first electrode on the first membrane, and a different, second electric signal to a second electrode on the second membrane. The first and second electric signals are configured to apply a varying voltage between the first electrode and the second electrode during a respective vibration cycle of the membranes. The first electrode on the first membrane is configured to interact with the second electrode on the second membrane by a varying electrostatic force during the respective vibration cycle depending on the varying voltage.
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公开(公告)号：US20220193723A1
公开(公告)日：2022-06-23
申请号：US17605437
申请日：2020-04-29
发明人： Hylke Broer AKKERMAN , Albert Jos Jan Marie VAN BREEMEN , Gerwin Hermanus GELINCK , Arthur Perry BERKHOFF , Paul Louis Maria Joseph VAN NEER , Arno Willem Frederik VOLKER
IPC分类号： B06B1/06
摘要： An acoustic device (100) comprises an array of acoustic transducers (10a,10b) formed by a patterned stack (12-15) on a flexible substrate (11). The stack comprises a piezoelectric layer (13) sandwiched between respective bottom and top electrode layers (12,15), and a patterned insulation layer (14) formed by a pattern of insulation material (14m). The pattern comprises insulated areas (A14) where the insulation material (14m) is disposed between one of the electrodes (12,15) and the piezoelectric layer (13), and contact areas (A10) without the insulation material (14m) where both electrodes (12,15) contact the piezoelectric layer (13).
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公开(公告)号：US20220192633A1
公开(公告)日：2022-06-23
申请号：US17599653
申请日：2020-04-06
发明人： Paul Louis Maria Joseph VAN NEER , Arno Willem Frederik VOLKER , Hylke Broer AKKERMAN , Gerwin Hermanus GELINCK , Antonius Maria Bernardus VAN MOL , Arthur Perry BERKHOFF
摘要： A device (100) and method for adhering by suction to a target surface (200). The device has a substrate (20) with a contact surface (20a) for contacting the device (100) to the target surface (200). A plurality of pocket (10) are formed by respective pocket surfaces (10a) concavely extending into the contact surface (20a). The pockets (10) have an open side (10b) facing and being closed off by the target surface (200). A flexible membrane (15) forms at least part of the pocket surface (10a). An actuator (40) is configured to actuate the flexible membrane (15). A one-way valve (30) through the pocket surface (10a) is configured to direct a contents of the pocket (10) via the one-way valve (30) to an environment (300).
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公开(公告)号：US20240345247A1
公开(公告)日：2024-10-17
申请号：US18682805
申请日：2022-08-12
发明人： Jan-Laurens Pieter Jacobus VAN DER STEEN , Laurens Christiaan Johannes Maria PETERS , Paul Louis Maria Joseph VAN NEER , Arno Willem Frederik VOLKER
CPC分类号： G01S15/8927 , G01S7/52079 , G01S7/521 , G01S15/892 , G01S15/8993
摘要： A system and method for acoustically measuring a curved object are described. A flexible sheet is provided with an array of acoustic transducers. The flexible sheet is wrapped around the curved object such that the acoustic transducers acoustically contact the curved object. The acoustic transducers are used to generate and/or measure acoustic waves at variable locations depending on a shape of the curved object. Spatial coordinates of the acoustic transducers are determined while the flexible sheet is wrapped around the curved object. In particular, the spatial coordinates are determined based on respective subsets of travel times used to calculate respective wave directions of the acoustic waves arriving at respective subarrays from a common origin, e.g. scattering element inside the curved object.
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公开(公告)号：US20240139772A1
公开(公告)日：2024-05-02
申请号：US17769276
申请日：2020-10-29
发明人： Paul Louis Maria Joseph VAN NEER , Arno Willem Frederik VOLKER , Hylke Broer AKKERMAN , Gerwin Hermanus GELINCK , Antonius Maria Bernardus VAN MOL
CPC分类号： B06B1/0276 , B06B1/0603 , B06B1/0614
摘要： An effective bandwidth in a membrane based ultrasonic transducer is improved by a control element (C). The control element (C) is disposed on a first side (10a) of a first membrane (10) of the transducer to increase or decrease a displacement amplitude of the first membrane (10) towards the first side (10a) and/or the opposite, second side (10b). This induces a displacement asymmetry (Za Zb) in a motion of the first membrane (10) during a first vibration (V1) of the first membrane (10) to the first side (10a) compared to the second side (10b). The displacement asymmetry may result in improved bandwidth.
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公开(公告)号：US20220260531A1
公开(公告)日：2022-08-18
申请号：US17630744
申请日：2020-08-27
摘要： An acoustic device (100) comprises an array of acoustic membranes (1, 2, 3, 4) formed on a foil (10). Each of the acoustic membranes (1, 2, 3, 4) is configured to vibrate ata resonance frequency (Fr) of the acoustic membranes (1, 2, 3, 4) for generating respective acoustic waves (W1,W2,W3,W4). Relative phases (ΔΦ12,ΔΦ34) are determined at which the acoustic membranes (1, 2, 4, 5) are actuated for generating a predetermined interference pattern (C) between the acoustic waves (W1,W2,W3,W4). A lamb wavelength (As) is determined of lamb waves (Ws) at the resonance frequency (Fr) travelling through intermediate sections (lOi, lOj) of the foil between adjacent acoustic membranes (1,2; 3,4). Distances (X12,X34) of the intermediate sections (10i, 10j) between the adjacent acoustic membranes (1,2; 3,4) in the layout are determined in accordance with the relative phases (ΔΦ12,ΔΦ34) and the lamb wavelength for having the lamb waves (Ws), generated by one acoustic membrane (1,3), arrive in phase with an adjacent acoustic membrane (2,4).
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公开(公告)号：US20210389118A1
公开(公告)日：2021-12-16
申请号：US17270376
申请日：2019-08-26
摘要： Translations of an object in a plurality of different spatial directions are measured using a plurality of interferometers to detect interference with light that has been reflected from a diffusively reflective surface, preferably using diffuse reflection from the same planar surface to measure in each of the different spatial directions. At least the interferometers that measure translation in directions that are not perpendicular to the surface each comprises a single mode fiber and a collimator configured to transmit the outgoing light to the object successively through the single mode fiber and the collimator, and to collect reflection into the single mode fiber with the collimator both along a same beam direction. It has been found that, when reflection of a beam with a beam direction at an oblique angle to a diffusively reflective surface is used, the interference resulting from translation of the object is due substantially only to translation in the beam direction.
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