Statistically optimized near‐field acoustical holography applied to a high‐power jet.

2011 ◽  
Vol 129 (4) ◽  
pp. 2492-2492 ◽  
Author(s):  
Alan T. Wall ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Scott D. Sommerfeldt ◽  
Jonathan D. Blotter ◽  
...  
Keyword(s):  
High Power ◽  
Near Field ◽  
Acoustical Holography

Cylindrical Fourier near‐field acoustical holography applied to a high‐power jet.

2011 ◽  
Vol 129 (4) ◽  
pp. 2493-2493
Author(s):  
David W. Krueger ◽  
Kent L. Gee ◽  
Alan T. Wall ◽  
Scott D. Sommerfeldt ◽  
Jonathan D. Blotter
Keyword(s):  
High Power ◽  
Near Field ◽  
Acoustical Holography

scholarly journals Near-field thermophotovoltaics for efficient heat to electricity conversion at high power density

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rohith Mittapally ◽  
Byungjun Lee ◽  
Linxiao Zhu ◽  
Amin Reihani ◽  
Ju Won Lim ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Near Field ◽  
Electrical Power ◽  
Photovoltaic Cells ◽  
High Power Density ◽  
Pv Cell ◽  
Electrical Power Output ◽  
Power Densities

AbstractThermophotovoltaic approaches that take advantage of near-field evanescent modes are being actively explored due to their potential for high-power density and high-efficiency energy conversion. However, progress towards functional near-field thermophotovoltaic devices has been limited by challenges in creating thermally robust planar emitters and photovoltaic cells designed for near-field thermal radiation. Here, we demonstrate record power densities of ~5 kW/m2 at an efficiency of 6.8%, where the efficiency of the system is defined as the ratio of the electrical power output of the PV cell to the radiative heat transfer from the emitter to the PV cell. This was accomplished by developing novel emitter devices that can sustain temperatures as high as 1270 K and positioning them into the near-field (<100 nm) of custom-fabricated InGaAs-based thin film photovoltaic cells. In addition to demonstrating efficient heat-to-electricity conversion at high power density, we report the performance of thermophotovoltaic devices across a range of emitter temperatures (~800 K–1270 K) and gap sizes (70 nm–7 µm). The methods and insights achieved in this work represent a critical step towards understanding the fundamental principles of harvesting thermal energy in the near-field.

USE OF RIGID REFLECTORS FOR THE VIRTUAL INCREASE OF FIELD DATA IN THE NEAR-FIELD ACOUSTICAL HOLOGRAPHY

2007 ◽  
Vol 15 (01) ◽  
pp. 49-61 ◽  
Author(s):  
SUNG-IL KIM ◽  
JEONG-GUON IH ◽  
JI-HOON JEONG
Keyword(s):  
Boundary Element Method ◽  
Transfer Matrix ◽  
Field Data ◽  
Near Field ◽  
Measurement Data ◽  
Source Reconstruction ◽  
Matrix Equations ◽  
Inverse Boundary ◽  
Additional Information ◽  
Acoustical Holography

This paper suggests the use of rigid reflectors to provide additional information for source reconstruction in near-field acoustical holography based on the inverse boundary element method. The additional field pressure and transfer matrix equations introduced provide a virtual increase in the measurement data without increasing the number of sensors or altering their arrangement, which could cost more than using reflectors. In order to validate this method, we successfully reconstruct a vibrating ellipse.

Near field analysis of CSG and BSG combined element under high power laser condition

2006 ◽  
Author(s):  
Xin Yao ◽  
Fuhua Gao ◽  
Yixiao Zhang ◽  
Lei Wang ◽  
Yongkang Guo ◽  
...  
Keyword(s):  
High Power ◽  
Near Field ◽  
Field Analysis ◽  
High Power Laser ◽  
Power Laser ◽  
Laser Condition

Identifying Defects in Thin Film of High Power Laser Lens by Using Near Field Microimaging Method

2017 ◽  
Vol 44 (1) ◽  
pp. 0103001
Author(s):  
白忠臣 Bai Zhongchen ◽  
黄兆岭 Huang Zhaoling ◽  
郝礼才 Hao Licai ◽  
陆安江 Lu Anjiang ◽  
秦水介 Qin Shuijie
Keyword(s):  
Thin Film ◽  
High Power ◽  
Near Field ◽  
High Power Laser ◽  
Power Laser

Improving near field of high-power laser beams

2011 ◽  
Vol 23 (4) ◽  
pp. 959-962
Author(s):  
谢娜 Xie Na ◽  
黄晚晴 Huang Wanqing ◽  
郭仪 Guo Yi ◽  
王晓东 Wang Xiaodong ◽  
方香云 Fang Xiangyun ◽  
...  
Keyword(s):  
High Power ◽  
Near Field ◽  
Laser Beams ◽  
High Power Laser ◽  
Power Laser

Effects of Quay Wall and Seabed Reflection on the AUV Acoustic Radiation Test Analysis

2014 ◽  
Vol 599-601 ◽  
pp. 922-926
Author(s):  
Guo Liang Xu ◽  
Qi Wei He ◽  
Shao Chun Ding ◽  
Hai Bo Wan
Keyword(s):  
Acoustic Field ◽  
Field Test ◽  
Sound Pressure ◽  
Acoustic Radiation ◽  
Near Field ◽  
Test Analysis ◽  
Complex Sound ◽  
Quay Wall ◽  
Radiation Test ◽  
Acoustical Holography

To analyze effects of quay environment on the AUV radiated acoustic field test, the PNAH (PNAH: planar near-field acoustical holography) was used to simulate acoustic field. By simulating the free and non-free acoustic field and comparing amplitudes and angles of complex sound pressure, Analyze effects of quay wall and seabed reflection on the AUV radiated acoustic field test to determine the standard of quay wall and seabed environment which meets testing. The work would provide a certain reference for the AUV radiated acoustic field test.

Sign in / Sign up

Export Citation Format

Share Document