Influence of the 400mm-aperture Nd:glass slab-amplifier gain nonuniformity on 1ω(1053nm) near-field performance

2013 ◽  
Author(s):  
Wen-yi Wang ◽  
Yuan-Chao Geng ◽  
Lin Chen ◽  
Yi-ming Luo ◽  
Yuan-bin Chen ◽  
...  
Keyword(s):  
Near Field ◽  
Field Performance ◽  
Amplifier Gain

Far-field performance of linear antennas determined from near-field data

2002 ◽  
Vol 50 (3) ◽  
pp. 408-410 ◽  
Author(s):  
F. Las-Heras ◽  
B. Galocha ◽  
J.L. Besada
Keyword(s):  
Field Data ◽  
Near Field ◽  
Field Performance ◽  
Far Field

scholarly journals Optical Design of a Novel Collimator System with a Variable Virtual-Object Distance for an Inspection Instrument of Mobile Phone Camera Optics

2021 ◽  
Vol 11 (8) ◽  
pp. 3350
Author(s):  
Hojong Choi ◽  
Se-woon Choe ◽  
Jaemyung Ryu
Keyword(s):  
Mobile Phone ◽  
Near Field ◽  
Optical Design ◽  
Field Performance ◽  
Chromatic Aberration ◽  
Virtual Object ◽  
Object Distance ◽  
Field Curvature ◽  
Infinite Point ◽  
Mobile Phone Camera

The resolution performance of mobile phone camera optics was previously checked only near an infinite point. However, near-field performance is required because of reduced camera pixel sizes. Traditional optics are measured using a resolution chart located at a hyperfocal distance, which can only measure the resolution at a specific distance but not at close distances. We designed a new collimator system that can change the virtual image of the resolution chart from infinity to a short distance. Hence, some lenses inside the collimator systems must be moved. Currently, if the focusing lens is moved, chromatic aberration and field curvature occur. Additional lenses are required to correct this problem. However, the added lens must not change the characteristics of the proposed collimator. Therefore, an equivalent-lens conversion method was designed to maintain the first-order and Seidel aberrations. The collimator system proposed in this study does not move or change the resolution chart.

scholarly journals Uniform Magnetic Field Characteristics Based UHF RFID Tag for Internet of Things Applications

Electronics ◽  
2021 ◽  
Vol 10 (13) ◽  
pp. 1603
Author(s):  
Abubakar Sharif ◽  
Yi Yan ◽  
Jun Ouyang ◽  
Hassan Tariq Chattha ◽  
Kamran Arshad ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Radio Frequency Identification ◽  
Uniform Magnetic Field ◽  
Near Field ◽  
Field Performance ◽  
Logarithmic Spiral ◽  
Uhf Rfid ◽  
Rfid Tag ◽  
Sensing Applications ◽  
Reader Antenna

This paper presents a novel inkjet-printed near-field ultra-high-frequency (UHF) radio frequency identification (RFID) tag/sensor design with uniform magnetic field characteristics. The proposed tag is designed using the theory of characteristics mode (TCM). Moreover, the uniformity of current and magnetic field performance is achieved by further optimizing the design using particle swarm optimization (PSO). Compared to traditional electrically small near-field tags, this tag uses the logarithmic spiral as the radiating structure. The benefit of the logarithmic spiral structure lies in its magnetic field receiving area that can be extended to reach a higher reading distance. The combination of TCM and PSO is used to get the uniform magnetic field and desired resonant frequency. Moreover, the PSO was exploited to get a uniform magnetic field in the horizontal plane of the normal phase of the UHF RFID near-field reader antenna. As compared with the frequently-used commercial near field tag (Impinj J41), our design can be readable up to a three times greater read distance. Furthermore, the proposed near-field tag design shows great potential for commercial item-level tagging of expensive jewelry products and sensing applications, such as temperature monitoring of the human body.

Near-field performance of passive coherence processing sonars

1979 ◽  
Vol 27 (6) ◽  
pp. 573-582 ◽  
Author(s):  
J. Patzewitsch ◽  
M. Srinath ◽  
C. Black
Keyword(s):  
Near Field ◽  
Field Performance

Near Field Performance of the Advanced Cold Process Canister

1990 ◽  
Vol 212 ◽  
Author(s):  
Lars O. Werme ◽  
Jukka-Pekka Salo
Keyword(s):  
Performance Evaluation ◽  
Carbon Steel ◽  
Service Life ◽  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Near Field ◽  
Field Performance ◽  
Load Bearing ◽  
Bearing Element

ABSTRACTA near-field performance evaluation of an advanced cold process canister for spent nuclear fuel has been performed jointly by TVO, Finland and SKB, Sweden. The canister consists of a carbon steel canister as a load bearing element, with an outer corrosion shield of copper. The canister design was originally designed by TVO. In the analysis, internal (ie corrosion processes from the inside of the canister) as well as external processes (mechanical and chemical) have been considered both prior to and after canister breach. Throughout the analysis, present day underground conditions have been assumed to persist during the service life of the canister.

Near-field performance assessment for a low-activity waste glass disposal system: laboratory testing to modeling results

2001 ◽  
Vol 298 (1-2) ◽  
pp. 95-111 ◽  
Author(s):  
B.P. McGrail ◽  
D.H. Bacon ◽  
J.P. Icenhower ◽  
F.M. Mann ◽  
R.J. Puigh ◽  
...  
Keyword(s):  
Performance Assessment ◽  
Laboratory Testing ◽  
Near Field ◽  
Field Performance ◽  
Waste Glass ◽  
Low Activity

Technical Workshop on Near-Field Performance Assessment of High-Level Waste Disposal

1993 ◽  
Vol 333 ◽  
Author(s):  
Michael Apted ◽  
Kjell Andersson
Keyword(s):  
Nuclear Energy ◽  
Source Term ◽  
International Workshop ◽  
Near Field ◽  
Field Performance ◽  
High Level Waste ◽  
International Survey ◽  
Energy Agency ◽  
High Level ◽  
Waste Repositories

ABSTRACTAn international Workshop was conducted to discuss the present state of modelling of near-field performance of high-level waste repositories, with emphasis on the conceptual and mathematical models for source-term calculations. The Workshop was based on an international survey and review of this topic by the authors. Technical position papers developed by the participants are summarized here. A Proceedings of the Workshop, including the full position papers and the survey and review document, are to be published by Nuclear Energy Agency by the end of 1993.

Near-Field Performance Assessment for the Saltstone Disposal Facility

1992 ◽  
Vol 294 ◽  
Author(s):  
Roger R. Seitz ◽  
John C. Walton ◽  
Craig A. Dicke ◽  
James R. Cook
Keyword(s):  
South Carolina ◽  
Performance Assessment ◽  
Near Field ◽  
Field Performance ◽  
Lessons Learned ◽  
Savannah River ◽  
Flow And Transport ◽  
Design Considerations ◽  
Disposal Facility ◽  
River Site

ABSTRACTA near-field performance assessment (PA) was conducted for the Saltstone Disposal Facility (SDF) at the Savannah River Site in South Carolina. The analysis was conducted in four parts: general screening calculations, degradation calculations, and flow and transport through the fractured and nonfractured facility. Modeling approaches and example sensitivity analysis results from the simulations of the fractured facility are discussed. Design considerations that may not be apparent without addressing flow and transport through fractures and lessons learned during the process are also presented.

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