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IEEE International Ultrasonics Symposium (IUS)

作者： diarra, Bakary Liebgott, Herve Cachard, Christian Tortoli, Piero Univ Lyon CREATIS Villeurbanne France

ISBN: (纸本)9781467345620;9781467345613

2d matrix probes present a real capability for three dimensional ultrasound imaging. The main difficulties to implement these probes come from the need of using a huge number of elements and from the grating lobes linked to the element periodical disposition and from the sidelobes arising when this number is reduced. In this study, a new design technique is proposed and shown capable of considerably reducing the probe element number as well as the grating lobes and sidelobes level. The grating lobes, in particular, are reduced by placing the elements without any grid consideration. The sidelobes and the number of active elements are optimized by the simulated annealing. Using the new approach we reduce the element number by 28% (from 235 to 169) and obtain a grating lobe reduction by -10 dB and -20 dB in lateral and elevation direction, respectively.

关键词： ultrasound imaging 2d array sparse array simulated annealing

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320 x 240 uncooled microbolometer 2d array for radiometric and process control applications

320 x 240 uncooled microbolometer 2D array for radiometric a...

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Infrared Technology and Applications XXIX Conference

作者： Tissot, JL Chatard, JP Tinnes, S Fieque, B ULIS F-38113 Veurey Voroize France

ISBN: (纸本)0819449334

Uncooled infrared focal plane arrays are being developed for a wide range of thermal imaging applications. developments are focused on the improvement of their sensitivity enabling the possibility to manufacture high performance radiometric devices with internal temperature stabilized shield to determine the input infrared flux. We present the characterization of a new radiometric device obtained from 320 x 240 uncooled microbolometer array with VIA aperture. This device is well adapted to radiometric or process control applications and moreover shows a high level of stability due to the internal temperature stabilized shield which prevents the detector from camera internal temperature shift artifacts.

关键词： uncooled IRFPA 2d array microbolometer amorphous silicon radiometry

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Focusing surface wave imaging with flexible 2d array

Focusing surface wave imaging with flexible 2D array

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Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016

作者： Zhou, Shiyuan Fu, Junqiang Li, Zhe Xu, Chunguang Xiao, dingguo Wang, Shaohan Beijing Inst Technol Sch Mech Engn Beijing Peoples R China Beijing Inst Technol Key Lab Fundamental Sci Adv Machining Beijing Peoples R China

ISBN: (纸本)9781510600454

Curved surface is widely exist in key parts of energy and power equipment, such as, turbine blade cylinder block and so on. Cycling loading and harsh working condition of enable fatigue cracks appear on the surface. The crack should be found in time to avoid catastrophic damage to the equipment. A flexible 2d array transducer was developed. 2d Phased array focusing method (2dPA), Mode-Spatial double Phased focusing method (MSdPF) and the imaging method using the flexible 2d array probe are studied. Experiments using these focusing and imaging method are carried out. Surface crack image is obtained with both 2dPA and MSdPF focusing method. It have been proved that MSdPF can be more adaptable for curved surface and more calculate efficient than 2dPA.

关键词： Phased focusing imaging 2d array surface waves curved surface

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MOSAIC: An integrated ultrasonic, 2d array system

MOSAIC: An integrated ultrasonic, 2D array system

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IEEE Ultrasonics Symposium

作者： Triger, Simon Wallace, John Saillant, Jean-Francois Cochran, Sandy Cumming, david R. S. Univ Glasgow Dept Elect & Elect Engn Microsyst Technol Res Grp Glasgow G12 8QQ Lanark Scotland Univ Paisley Sch Engn & Sci Microscale Sensors Paisley Renfrew Scotland Univ Dundee Inst Med Sci & Technol Dundee Scotland

ISBN: (纸本)9781424413836

An Investigation Into the development of an ultrasound Imaging system capable of custornization for multiple applications via the tessellation of in-system programmable scalable modules, or tiles, Is presented here. Each tile contains an Individual ultrasonic array, operating at +/-3.3V, which can be assembled Into a larger 'mosaic' of multiple tiles to create arrays of any size or shape. The ability to form an imaging system from generic building blocks which are physically Identical for manufacturing purposes yet functionally unique via programming to suit the application has many potential benefits in the field of ultrasonics. The system Is primarily targeted at underwater sonar and non-destructive testing, as defined by the current excitation frequency, but the concept is equally applicable to applications In biomedical ultrasound.

关键词： component 2d array microelectronics system integration miniaturization

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A Low-Profile Broadband 2d array Based on Inverted-E and Π Shaped Shared Structure Elements

A Low-Profile Broadband 2D Array Based on Inverted-E and Π ...

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2024 IEEE International Workshop on Wireless Sensing Technologies and Applications, IWSA 2024

作者： Xu, Yan Yuan, Bin Wang, Wenchang Liu, Zhen Shanghai Jiao Tong University School of Electronic Information and Electrical Engineering Shanghai China

ISBN: (纸本)9798331505837

In this paper, A 2d array is proposed based on inverted-E and Π shaped linear array elements, characterized by a low-profile and broadband shared structure. The design utilizes a shared monopole top-hat and PIFA patch structure to form inverted-E and Π shaped bi-directional linear array elements with elliptical top-hats and grounded stubs. A high-gain end-fire quasi-Yagi 2d array is then realized by employing these two linear array elements, functioning respectively as driven and parasitic elements. A prototype of the proposed 2d array consisting of three sub-arrays (one inverted-E and two Π shaped elements) operating in the upper C-band (f0 = 6.3GHz) is fabricated and tested. The measured peak gain reaches 9.3-10.3dBi within the 5.81-6.87GHz band, with an even wider impedance bandwidth (|S11| 0 © 2024 IEEE.

关键词： 2d array broadband inverted-E shaped element low-profile shared structure Π shaped element

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Physical dosimetry of volumetric modulated arc therapy (VMAT) using EPId and 2d array for quality assurance

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EGYPTIAN JOURNAL OF RAdIOLOGY ANd NUCLEAR MEdICINE 2018年第2期49卷 477-484页

作者： Mohamed, Ismail E. Ibrahim, Ayman G. Zidan, Hamdy M. El-Bahkiry, Hesham S. El-sahragti, Adel Y. Ain Shams Univ Fac Med Radiat Oncol Dept Cairo Egypt Mansoura Univ Hosp Oncol & Nucl Med Dept Mansoura Egypt Damietta Univ Phys Dept Fac Sci Dumyat Egypt Mansoura Univ Oncol & Nucl Med Dept Fac Med Mansoura Egypt Jazan Univ Fac Appl Med Sci Diagnost Radiol Dept Jizan Saudi Arabia

Outline: To address the correspondence of measured and predicted doses for different malignant tumours utilizing various gamma criteria and QA for confirmation of VMAT with an EPId and 2d array detector. Methods: 24 patients with different malignant tumors were treated by VMAT techniques on Varian IX linear accelerator with 6 MV photon beams. Eclipse treatment planning system (TPS) is used to plan Patient's charts. Gamma Index (GI) variation was compared to the procedure of pre-treatment verification in VMAT plans. Results: The gamma criteria (dd/dTA) of dose difference and distance to agreement for (3%/3 mm), mean +/- Sd are gamma( <= 1%) = 99.42% +/- 0.67%, gamma(ma)(x) = 2.11 +/- 0.56 and gamma(avg) = 0.19 +/- 0.05 by EPId, and gamma(%<= 1) = 99.36% +/- 0.53%, gamma(max) = 1.65 +/- 0.45 and gamma(avg) = 0.22 +/- 0.05 by using 2d array detector. Conclusions: Specific QA of VMAT patient (using EPId or 2d array) display great possibility to spare time and to verify individual IMRT fields. 3%/3 mm is the most appropriate of gamma criteria (dd/dTA) for VMAT plans quality assurance. Control charts are a beneficial method for verification assessment for patient specific quality control.

关键词： VMAT EPId 2d array Gamma index Control charts QA

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Fabrication Process of Conventional and Unconventional 3d Microcoils Based on 2d array of SU-8 Microposts Structure 22

Fabrication Process of Conventional and Unconventional 3D Mi...

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22nd International Conference on Solid-State Sensors, Actuators and Microsystems, Transducers 2023

作者： Mamleyev, Emil R. Kohl, Manfred Korvink, Jan G. Poletkin, Kirill V. Institute Of Microstructure Technology Karlsruhe Institute Of Technology Helmholtz-Platz 1 Eggenstein-Leopoldshafen76344 Germany Hefei University Of Technology School Of Instrument Science And Optoelectronics Engineering Anhui Hefei230002 China

ISBN: (纸本)9784886864352

This paper reports on the novel microfabrication approach resulting in the 2d array of SU-8 micro-posts for the solenoid micro-coil winding. The arrays contain a number of cylindrical SU-8 posts, each accomplishing pads for electric connection allowing specific activation of the fabricated 3d micro-coil device. The arrays are optimized to host a maximal possible post density in accordance with the minimal allowed distance of the wire bonder capillary (~600μm) at the selected post height (~500μm). despite the standard cylindrical post shape, the wire bonder trajectory can be driven to form unconventional micro-coil shapes between several posts that, in turn, effectively manage the magnetic field in micro-system devices. Here, we demonstrate the wire bonding of the oval helix around two posts and interwind in the shape of infinity between two and four posts. As an illustrative example, these new micro-coil shapes were tested in the levitation actuation of the conductive proof masses (PM). © 2023 IEEJ.

关键词： 2d array Inductive levitation Micro-coils Wirebonding

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2d array of cold-electron nanobolometers with double polarised cross-dipole antennas

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NANOSCALE RESEARCH LETTERS 2012年第1期7卷 224-224页

作者： Kuzmin, Leonid S. Chalmers S-41296 Gothenburg Sweden

A novel concept of the two-dimensional (2d) array of cold-electron nanobolometers (CEB) with double polarised cross-dipole antennas is proposed for ultrasensitive multimode measurements. This concept provides a unique opportunity to simultaneously measure both components of an RF signal and to avoid complicated combinations of two schemes for each polarisation. The optimal concept of the CEB includes a superconductor-insulator-normal tunnel junction and an SN Andreev contact, which provides better performance. This concept allows for better matching with the junction gate field-effect transistor (JFET) readout, suppresses charging noise related to the Coulomb blockade due to the small area of tunnel junctions and decreases the volume of a normal absorber for further improvement of the noise performance. The reliability of a 2d array is considerably increased due to the parallel and series connections of many CEBs. Estimations of the CEB noise with JFET readout give an opportunity to realise a noise equivalent power (NEP) that is less than photon noise, specifically, NEP = 4 10(-19) W/Hz(1/2) at 7 THz for an optical power load of 0.02 fW.

关键词： Cold-electron bolometer 2d array Focal plane antenna SIN tunnel junction Andreev contact JFET readout

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Non-grid based elements positioning for optimal 2d array beams

Non-grid based elements positioning for optimal 2D array bea...

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IEEE International Ultrasonics Symposium

作者： Bakary diarra Herve Liebgott Christian Cachard Piero Tortoli CREATIS Universite de Lyon CNRS UMR 5220 INSERM U1044 Universite Lyon 1 INSA-Lyon Villeurbanne France Electronics and Telecommunications Dept. Universita degli Studi di Firenze Florence Italy

ISBN: (纸本)9781467345613

关键词： ultrasound imaging 2d array sparse array simulated annealing grating lobe element number sidelobe Elements Probes design techniques simulated annealing

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OPTIMIZEd 2d array dESIGN FOR ULTRASOUNd IMAGING

OPTIMIZED 2D ARRAY DESIGN FOR ULTRASOUND IMAGING

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European Signal Processing Conference

作者： Bakary diarra Herve Liebgott Marc Robini Piero Tortoli Christian Cachard CREATIS Universite de Lyon Electronics and Telecommunications Dept. Universita degli Studi di Firenze

ISBN: (纸本)9781467310680

Ultrasound imaging is one of the least expensive and safest diagnostic modalities routinely used. An attractive recent development in this field is three-dimensional (3d) imaging with two-dimensional (2d) matrix probes. The difficulty in implementing these probes comes from their large number of elements;for instance, the probe considered in this paper is composed of 1024 elements, whereas the number of channels of most current beamformers ranges from 64 to 256. To reduce the number of active elements, we propose a new sparse array design technique based on simulated annealing. Our method is capable of significantly reducing the number of probe elements as well as the side lobe level in a reasonable amount of computing time. Experiments in the context of hepatic biopsy show that good imaging performance can be obtained with only 177 active elements out of the total of 1024.

关键词： Ultrasound 2d array Sparse array Simulated annealing Ultrasonography side lobe level Elements Ultrasonic Waves Imaging Probes simulated annealing arrays

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