Recovering physical fields with a two-dimensional fiber-optics measurement grid

1999 ◽  
Vol 42 (3) ◽  
pp. 237-246 ◽  
Author(s):  
Yu. N. Kul'chin ◽  
O. B. Vitrik ◽  
O. V. Kirichenko
Keyword(s):  
Fiber Optics ◽  
Two Dimensional ◽  
Physical Fields

scholarly journals Two Dimensional Interferometric Photon Counting Observations with the 6m Telescope

1982 ◽  
Vol 67 ◽  
pp. 223-227
Author(s):  
J. Boulesteix ◽  
Y. Georgelin ◽  
M. Marcelin ◽  
J.A. Fort
Keyword(s):  
Fiber Optics ◽  
Photon Counting ◽  
Microchannel Plate ◽  
Two Dimensional ◽  
Silicon Target

This detector has been in use since 1977. Following Labeyrie (1977), it consists of a microchannel plate electrostatically focussed intensifier (TH 9304) coupled by fiber optics to an SIT camera (TH 9655), these parts being manufactured by THOMSON-CSF (FRANCE). The diameter of the S20 photocathode is 25mm but the silicon target is only 18mm wide. The scanning electronics are conventional. The detector is cooled to -5°C, the photocathode being in a dry nitrogen chamber. The system has been described by Boulesteix (1978).

Recovering vector field patterns by means of a two-dimensional fiber-optics measurement grid

1999 ◽  
Vol 42 (6) ◽  
pp. 541-550 ◽  
Author(s):  
Yu. N. Kul'chin ◽  
O. B. Vitrik ◽  
O. T. Kamenev ◽  
R. V. Romashko
Keyword(s):  
Vector Field ◽  
Fiber Optics ◽  
Two Dimensional ◽  
Field Patterns

Analysis of Effective Numerical Aperture in 2-D Photonic Crystal Waveguide

2014 ◽  
Vol 979 ◽  
pp. 455-458
Author(s):  
T. Chantakit ◽  
S. Kamoldilok ◽  
K. Srinuanjan ◽  
P.P. Yupapin
Keyword(s):  
Photonic Crystal ◽  
Fiber Optics ◽  
Numerical Aperture ◽  
Two Dimensional ◽  
Photonic Crystal Waveguide ◽  
Incident Wavelength ◽  
Dimensional Photonic Crystal ◽  
Near Future ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

The effective numerical aperture calculation in two-dimensional Photonic crystal waveguide has been proposed. In this paper we present the analysis of ray optics refracted inside nanorods and at the boundaries between rods, which separates rod gap is much smaller than the incident wavelength assumed to reflect on the region. In operation, the resolving numerical aperture was compared with the finite difference time domain method via OptiFDTD software. Although numerical aperture mentioned above was found to be extremely close to fiber optics, a transmission passes though compartments of the rods are observed due to significant estimation of transmission and reflection of electric field. The compared simulation results will be discussed. By the aforementioned is that in the near future we will modify wave equation in periodic media of waveguide structures reached to the transverse electric equation of beam propagation in the two-dimensional Photonic crystal waveguide analysed.

The Effect of Casting Speed on Physical Fields of AZ80 Magnesium Alloy during DC Casting

2015 ◽  
Vol 816 ◽  
pp. 343-348
Author(s):  
Yuan Yuan Bai ◽  
Qi Chi Le ◽  
Hai Tao Zhang ◽  
Zhi Qiang Zhang ◽  
Lei Bao
Keyword(s):  
Casting Process ◽  
Hot Cracking ◽  
Hot Tearing ◽  
Two Dimensional ◽  
High Quality ◽  
Az80 Magnesium Alloy ◽  
Finite Element Package ◽  
Flow Heat ◽  
Dc Casting ◽  
Physical Fields

A comprehensive two-dimensional (2D) mathematical model based on a combination of the commercial finite element package ANSYS and the commercial finite volume package FLUENT was developed to describe the interaction of the multiple physics fields during DC casting process. ANSYS was for calculation of the stress field and FLUENT was for calculation of the fluid flow, heat transfer of the solidification. The results show that: the model is reliable and accurate to simulate the multiple physics of DC casting. Consequently, the position, which was prone to hot tearing, was confirmed and the max velocity, at which the hot cracking might not occur, was determined. The numerical simulations will be very useful for preventing crack, optimizing casting parameters and obtaining high-quality ingots.

scholarly journals Colloidal 2D PbSe Nanoplatelets with Efficient Emission Reaching the Telecom O-, E- and S-Band

2022 ◽  
Author(s):  
Lars F. Klepzig ◽  
Leon Biesterfeld ◽  
Michel Romain ◽  
André Niebur ◽  
Anja Schlosser ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Fiber Optics ◽  
Short Wave ◽  
Two Dimensional ◽  
Lead Chalcogenide ◽  
Short Wave Infrared

Colloidal two-dimensional (2D) lead chalcogenide nanoplatelets (NPLs) represent highly interesting materials for near- and short wave-infrared applications including innovative glass fiber optics exhibiting negligible attenuation. In this work, we demonstrate...

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

Analysis of the 9th November 1990 flare

2000 ◽  
Vol 179 ◽  
pp. 229-232
Author(s):  
Anita Joshi ◽  
Wahab Uddin
Keyword(s):  
Image Processing ◽  
Two Dimensional ◽  
Temporal Behaviour ◽  
Contour Maps ◽  
Dimensional Measurements ◽  
Processing Software ◽  
Image Processing Software

AbstractIn this paper we present complete two-dimensional measurements of the observed brightness of the 9th November 1990Hαflare, using a PDS microdensitometer scanner and image processing software MIDAS. The resulting isophotal contour maps, were used to describe morphological-cum-temporal behaviour of the flare and also the kernels of the flare. Correlation of theHαflare with SXR and MW radiations were also studied.

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