scholarly journals High resolution surface backscatter measurements with the SeaWinds pencil-beam scatterometer

1998 ◽  
Author(s):  
M.W. Spencer ◽  
Chialin Wu ◽  
D.G. Long
Keyword(s):  
High Resolution ◽  
Pencil Beam

scholarly journals The Radio Brightness Distribution on the Sun at 21 cm from Combined Eclipse and Pencil?Beam Observations

1961 ◽  
Vol 14 (3) ◽  
pp. 403 ◽  
Author(s):  
T Krishnan ◽  
NR Labrum
Keyword(s):  
High Resolution ◽  
High Sensitivity ◽  
Brightness Distribution ◽  
Pencil Beam ◽  
The Sun ◽  
Radio Brightness ◽  
Radio Brightness Distribution ◽  
Grating Interferometer

A study of the brightness distribution on the Sun at 21-cm wavelength on April 8, 1959, is described. High resolution observations were made of the partial eclipse on that day with a simple radiometer of high sensitivity. The brightness distribution of the uneclipsed Sun at the same wavelength was obtained using a cross-grating interferometer, which enabled the bright regions to be located accurately.

The Electron Temperature of the Planetary Nebula IC 418

1969 ◽  
Vol 1 (5) ◽  
pp. 216-217
Author(s):  
A. E. Le Marne ◽  
P. A. Shaver
Keyword(s):  
High Resolution ◽  
Electron Temperature ◽  
Planetary Nebula ◽  
Planetary Nebulae ◽  
Pencil Beam ◽  
Radio Observatory ◽  
A Current

In a current programme at the Molonglo Radio Observatory using the high-resolution pencil beam of the instrument (∼3′ arc) an attempt is being made to extend the measured spectra of known planetary nebulae down to 408 MHz. Of 23 such planetaries already investigated, 14 have been detected. The main results will be given elsewhere; here it is proposed to discuss in detail only the well-known planetary nebula IC 418.

SU-E-CAMPUS-T-05: Validation of High-Resolution 3D Patient QA for Proton Pencil Beam Scanning and IMPT by Polymer Gel Dosimetry

2014 ◽  
Vol 41 (6Part22) ◽  
pp. 384-384
Author(s):  
A Cardin ◽  
S Avery ◽  
M Maryanski ◽  
X Ding ◽  
A Kassaee ◽  
...  
Keyword(s):  
High Resolution ◽  
Pencil Beam ◽  
Gel Dosimetry ◽  
Polymer Gel ◽  
Beam Scanning ◽  
Pencil Beam Scanning ◽  
Polymer Gel Dosimetry

A High Resolution Galactic Survey at 19·7 Mc/s

1961 ◽  
Vol 14 (4) ◽  
pp. 508 ◽  
Author(s):  
The Late CA Shain ◽  
MM Komesaroff ◽  
CS Higgins
Keyword(s):  
High Resolution ◽  
Milky Way ◽  
Galactic Plane ◽  
H Ii Regions ◽  
Pencil Beam

An extensive strip of the Southern Milky Way has been surveyed at 19� 7 Mc/s, using a Mills Cross with a pencil beam 1� 40 wide. The radio contours show a number of dark areas whose positions agree with those of optically-observed H II regions which at this frequency are soon in absorption. In addition, an intensity minimum along the galactic equator appears to represent the effect of absorption due to many H II regions extending to great distances in the galactic plane.

scholarly journals Ultra-broadband axicon transducer for optoacoustic endoscopy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zakiullah Ali ◽  
Christian Zakian ◽  
Vasilis Ntziachristos
Keyword(s):  
High Resolution ◽  
Optical Absorption ◽  
Spherical Geometry ◽  
Lateral Resolution ◽  
Pencil Beam ◽  
Depth Of Focus ◽  
Imaging Characteristics ◽  
Focused Transducers ◽  
Image Performance ◽  
Spherical Detector

AbstractImage performance in optoacoustic endoscopy depends markedly on the design of the transducer employed. Ideally, high-resolution performance is required over an expanded depth of focus. Current optoacoustic focused transducers achieve lateral resolutions in the range of tens of microns in the mesoscopic regime, but their depth of focus is limited to hundreds of microns by the nature of their spherical geometry. We designed an ultra-broadband axicon detector with a 2 mm central aperture and investigated whether the imaging characteristics exceeded those of a spherical detector of similar size. We show a previously undocumented ability to achieve a broadband elongated pencil-beam optoacoustic sensitivity with an axicon detection geometry, providing approximately 40 μm-lateral resolution maintained over a depth of focus of 950 μm—3.8 times that of the reference spherical detector. This performance could potentially lead to optoacoustic endoscopes that can visualize optical absorption deeper and with higher resolution than any other optical endoscope today.

TH-C-T-6E-08: High Resolution Film Based Finite Pencil Beam Model for MLC Defined Beamlets

2005 ◽  
Vol 32 (6Part21) ◽  
pp. 2168-2168
Author(s):  
B Lynch ◽  
M Ranade ◽  
J Li ◽  
D Low ◽  
J Dempsey
Keyword(s):  
High Resolution ◽  
Beam Model ◽  
Pencil Beam

A high-resolution scanning pencil-beam scatterometer: system design challenges

2016 ◽  
Author(s):  
Prantik Chakraborty ◽  
Priyanka Gupta ◽  
Tapan Misra
Keyword(s):  
High Resolution ◽  
System Design ◽  
Pencil Beam ◽  
Design Challenges
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