scholarly journals Speckle Reduction in Near-field Image of Multimode Fiber with a Piezoelectric Transducer[Author's Correction]

2008 ◽  
Vol 12 (4) ◽  
pp. 364-364
Author(s):  
Woo-Sung Ha ◽  
Se-Jin Lee ◽  
Kyung-Hwan Oh ◽  
Yong-Min Jung ◽  
Jun-Ki Kim
Keyword(s):  
Piezoelectric Transducer ◽  
Near Field ◽  
Speckle Reduction ◽  
Multimode Fiber

scholarly journals Speckle Reduction in Near-field Image of Multimode Fiber with a Piezoelectric Transducer

2008 ◽  
Vol 12 (3) ◽  
pp. 126-130 ◽  
Author(s):  
Woo-Sung Ha ◽  
Se-Jin Lee ◽  
Kyung-Hwan Oh ◽  
Yong-Min Jung ◽  
Jun-Ki Kim
Keyword(s):  
Piezoelectric Transducer ◽  
Near Field ◽  
Speckle Reduction ◽  
Multimode Fiber

Experimental Research on the Levitation Support Way of Ultrasonic Thrust Bearing

2013 ◽  
Vol 423-426 ◽  
pp. 1571-1576 ◽  
Author(s):  
Yun Guang Song ◽  
Zun Qiang Fan ◽  
Xiao Dong Sun ◽  
Liang Liang Wang ◽  
Feng Jun Tian ◽  
...  
Keyword(s):  
Experimental Research ◽  
Radiation Pressure ◽  
Piezoelectric Transducer ◽  
Thrust Bearing ◽  
Near Field ◽  
Conical Surface ◽  
Front Cover ◽  
Ultrasonic Radiation ◽  
Rotating Speed ◽  
The Way

In this paper, two ways of levitation support of ultrasonic thrust bearing are disscussed. Based on the mechanism of the near-field ultrasonic levitation, the front cover of the piezoelectric transducer is designed as conical structure.The ultrasonic radiation pressure which distributes on the conical surface can be decomposed into the axial and radial supporting the levitation subject bidirectionally. Finnally contrast experiments are carried out, indicating that when the requirement of levitation mass being satisfied, the way of bidirectional support runs more stably compared with the pure way of the axial levitation support.It supposes that the way of bidirectional levitation support is more conducive to improve the rotating speed of the rotor.

scholarly journals Compound Speckle Reduction in Laser Imaging Systems by Using a Vibrating Multimode Fiber and a Tracked Moving Flexible DOE Loop

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Jun Zhou ◽  
Zichun Le ◽  
Zongshen Liu ◽  
Yanxin Dai ◽  
Yanyu Guo ◽  
...  
Keyword(s):  
Imaging Systems ◽  
Speckle Reduction ◽  
Multimode Fiber ◽  
Laser Imaging

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

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