scholarly journals A theoretical-practical study on poles and zeros calculated from a filtered modulated function of an interference pattern

2021 ◽  
pp. 104534
Author(s):  
José Trinidad Guillen Bonilla ◽  
Alex Guillen Bonilla ◽  
Verónica María Rodríguez Betancourtt ◽  
Héctor Guillen Bonilla ◽  
Maricela Jiménez Rodríguez ◽  
...  
Keyword(s):  
Interference Pattern ◽  
Poles And Zeros

scholarly journals Interference Pattern Representation on the Complex s-Plane

2020 ◽  
Author(s):  
José Trinidad Guillen Bonilla ◽  
Alex Guillen Bonilla ◽  
Mario Alberto García Ramírez ◽  
Gustavo Adolfo Vega Gómez ◽  
Héctor Guillen Bonilla ◽  
...  
Keyword(s):  
Interference Pattern ◽  
Complex Function ◽  
Optical Path Difference ◽  
Path Difference ◽  
Graphical Representations ◽  
Low Coherence ◽  
Sensing Systems ◽  
The Laplace Transform ◽  
Bode Diagram ◽  
Poles And Zeros

In this work, the normalized interference pattern produced by a coherence interferometer system was represented as a complex function. The Laplace transform was applied for the transformation. Poles and zeros were determined from this complex function, and then, its pole-zero map and its Bode diagram were proposed. Both graphical representations were implemented numerically. From our numerical results, pole location and zero location depend on the optical path difference (OPD), while the Bode diagram gives us information about the OPD parameter. Based on the results obtained from the graphical representations, the coherence interferometer systems, the low-coherence interferometer systems, the interferometric sensing systems, and the fiber optic sensors can be analyze on the complex s-plane.

Computer analysis of side-band holography in STEM

1991 ◽  
Vol 49 ◽  
pp. 684-685
Author(s):  
M.A. Gribelyuk ◽  
J.M. Cowley
Keyword(s):  
Interference Pattern ◽  
Computer Analysis ◽  
Side Band ◽  
Diffraction Plane ◽  
Illumination System ◽  
Probe Size

Recently the use of a biprism in a STEM instrument has been suggested for recording of a hologram. A biprism is inserted in the illumination system and creates two coherent focussed beams at the specimen level with a probe size d= 5-10Å. If one beam passes through an object and another one passes in vacuum, an interference pattern, i.e. a hologram can be observed in diffraction plane (Fig.1).

Research of phase correction technology based on interference pattern in FTIR

2014 ◽  
Vol 27 (7) ◽  
pp. 663-668
Author(s):  
Chao Zhu ◽  
Changhua Lu ◽  
Wenqing Liu ◽  
Yujun Zhang ◽  
Xiaoting Chen ◽  
...  
Keyword(s):  
Interference Pattern ◽  
Phase Correction

RESULTS OF POLARIZED LIGHT USE FOR STUDY OF STRESS-STRAIN STATE OF CORNEA IN PATHOLOGY OF EXTRAOCULAR MUSCLES

2020 ◽  
pp. 65-69
Author(s):  
Nataliia Mykhailivna Kovtun ◽  
Ihor Volodymyrovych Kaplin
Keyword(s):  
Interference Pattern ◽  
Optical Anisotropy ◽  
Extraocular Muscle ◽  
Strain State ◽  
Polarized Light ◽  
Attachment Site ◽  
Rectus Muscle ◽  
Extraocular Muscles ◽  
Asymmetric Distortion ◽  
Interference Picture

The parameters of interference patterns observed on the cornea in a polarized light in pathology of extraocular muscles were quantitatively evaluated. A study of the shape of 147 interference patterns observed on the cornea in a polarized light showed that the horizontal deviation of an eye in 56 % of cases was caused by the displacement of the attachment of the upper rectus muscle towards the inner rectus muscle. During illumination of the cornea of a live eye with polarized light, a specific interference pattern in the form of a rhombus formed by rainbow stripes (isochromes) is observed. It is established that such an interference pattern is the result of the influence of extraocular muscles on the cornea. The findings showed that the weakening of the force of one of muscles leads to asymmetric distortion of the shape of the interference rhombus, which is manifested with a reduced length of the corresponding section of the diagonal. On the contrary, as the force of the muscle increases, the corresponding section of the diagonal enhances. The displacement of the attachment site of direct extraocular muscle along the line of action is equivalent to a change in effort on its part, indicated appropriately by the shape of the interference rhombus. As the muscle moves away from the line of action, the angle of the interference rhombus is shifted away from the corresponding meridian. Key words: polarized light, optical anisotropy, cornea, extra−ocular muscles, interference picture.

scholarly journals Satellite Investigation of Semidiurnal Internal Tides in the Sulu-Sulawesi Seas

2021 ◽  
Vol 13 (13) ◽  
pp. 2530
Author(s):  
Xiaoyu Zhao ◽  
Zhenhua Xu ◽  
Ming Feng ◽  
Qun Li ◽  
Peiwen Zhang ◽  
...  
Keyword(s):  
Interference Pattern ◽  
Energy Flux ◽  
Internal Tide ◽  
Tidal Energy ◽  
Internal Tides ◽  
Altimeter Data ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Sulu Sea ◽  
Tidal Energy Flux

The mode-1 semidiurnal internal tides that emanate from multiple sources in the Sulu-Sulawesi Seas are investigated using multi-satellite altimeter data from 1993–2020. A practical plane-wave analysis method is used to separately extract multiple coherent internal tides, with the nontidal noise in the internal tide field further removed by a two-dimensional (2-D) spatial band-pass filter. The complex radiation pathways and interference patterns of the internal tides are revealed, showing a spatial contrast between the Sulu Sea and the Sulawesi Sea. The mode-1 semidiurnal internal tides in the Sulawesi Sea are effectively generated from both the Sulu and Sangihe Island chains, forming a spatially inhomogeneous interference pattern in the deep basin. A cylindrical internal tidal wave pattern from the Sibutu passage is confirmed for the first time, which modulates the interference pattern. The interference field can be reproduced by a line source model. A weak reflected internal tidal beam off the Sulawesi slope is revealed. In contrast, the Sulu Island chain is the sole energetic internal tide source in the Sulu Sea, thus featuring a relatively consistent wave and energy flux field in the basin. These energetic semidiurnal internal tidal beams contribute to the frequent occurrence of internal solitary waves (ISWs) in the study area. On the basis of the 28-year consistent satellite measurements, the northward semidiurnal tidal energy flux from the Sulu Island chain is 0.46 GW, about 25% of the southward energy flux. For M2, the altimetric estimated energy fluxes from the Sulu Island chain are about 80% of those from numerical simulations. The total semidiurnal tidal energy flux from the Sulu and Sangihe Island chains into the Sulawesi Sea is about 2.7 GW.

Photorefractive response in the case of a high interference-pattern contrast

1994 ◽  
Vol 24 (1) ◽  
pp. 68-70 ◽  
Author(s):  
Boris Ya Zel'dovich ◽  
E P Shershakov
Keyword(s):  
Interference Pattern

scholarly journals Small-spot interference pattern for single-step 2D integration and wide wavelength detuning of planar Bragg gratings

2003 ◽  
Vol 39 (14) ◽  
pp. 1050 ◽  
Author(s):  
C.B.E. Gawith ◽  
G.D. Emmerson ◽  
S.G. McMeekin ◽  
J.R. Bonar ◽  
R.I. Laming ◽  
...  
Keyword(s):  
Interference Pattern ◽  
Bragg Gratings ◽  
Single Step ◽  
Small Spot

Interference pattern formation from an array of coherent laser beams

2002 ◽  
Vol 20 (6) ◽  
pp. 2602 ◽  
Author(s):  
Y. Liu ◽  
J. Barhen ◽  
Y. Braiman ◽  
J. X. Zhong
Keyword(s):  
Pattern Formation ◽  
Interference Pattern ◽  
Laser Beams
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