Optical incoherent synthetic aperture imaging by superposition of phase-shifted optical transfer functions

2021 ◽  
Author(s):  
Mani Rai ◽  
Joseph Rosen
Keyword(s):  
Transfer Functions ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging ◽  
Optical Transfer

Effects of misalignment errors on the optical transfer functions of synthetic aperture telescopes

2004 ◽  
Vol 43 (32) ◽  
pp. 5926 ◽  
Author(s):  
Jorge L. Flores ◽  
Marija Strojnik ◽  
Gonzalo Páez ◽  
Guillermo García-Torales
Keyword(s):  
Transfer Functions ◽  
Synthetic Aperture ◽  
Optical Transfer

Golay Coded Sequences in Synthetic Aperture Imaging Systems

2011 ◽  
Vol 36 (4) ◽  
Author(s):  
Ihor Trots ◽  
Yuriy Tasinkevych ◽  
Andrzej Nowicki ◽  
Marcin Lewandowski
Keyword(s):  
Imaging Systems ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging

WAVEGUIDING STRUCTURE EXHIBITING VARIOUS NONLINEAR OPTICAL TRANSFER FUNCTIONS REALIZED WITH A WANNIER-STARK MODULATOR CONTAINING AN InGaAs/InP SUPERLATTICE

1995 ◽  
Vol 04 (02) ◽  
pp. 325-336 ◽  
Author(s):  
H. C. NEITZERT ◽  
C. CACCIATORE ◽  
D. CAMPI ◽  
C. RIGO
Keyword(s):  
Nonlinear Optical ◽  
Stark Effect ◽  
Transfer Functions ◽  
Polarized Light ◽  
Optical Power ◽  
Optical Signal ◽  
Signal Frequency ◽  
Frequency Multiplication ◽  
Short Period ◽  
Optical Transfer

We report on the application of a self electro-optic effect device in waveguiding configuration for the generation of a wide variety of different nonlinear optical transfer functions. It makes use of the Wannier-Stark effect in an InGaAs/InP short period superlattice and operates at room temperature for TE-polarized light around 1.55 μm. In particular, optical bistability, optical signal-frequency multiplication and the operation as an optical power discriminator are demonstrated.

Non-uniform optical transfer functions in particle imaging: calibration and application to tomographic reconstruction

2012 ◽  
Vol 24 (2) ◽  
pp. 024009 ◽  
Author(s):  
Daniel Schanz ◽  
Sebastian Gesemann ◽  
Andreas Schröder ◽  
Bernhard Wieneke ◽  
Matteo Novara
Keyword(s):  
Transfer Functions ◽  
Tomographic Reconstruction ◽  
Optical Transfer ◽  
Particle Imaging

scholarly journals Synthetic Aperture Imaging Using High-Frequency Convex Array for Ophthalmic Ultrasound Applications

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2275
Author(s):  
Hae Gyun Lim ◽  
Hyung Ham Kim ◽  
Changhan Yoon
Keyword(s):  
Image Quality ◽  
Penetration Depth ◽  
Spatial Resolution ◽  
High Frequency ◽  
Imaging System ◽  
Ex Vivo ◽  
Synthetic Aperture ◽  
Single Element ◽  
High Frequency Ultrasound ◽  
Synthetic Aperture Imaging

High-frequency ultrasound (HFUS) imaging has emerged as an essential tool for pre-clinical studies and clinical applications such as ophthalmic and dermatologic imaging. HFUS imaging systems based on array transducers capable of dynamic receive focusing have considerably improved the image quality in terms of spatial resolution and signal-to-noise ratio (SNR) compared to those by the single-element transducer-based one. However, the array system still suffers from low spatial resolution and SNR in out-of-focus regions, resulting in a blurred image and a limited penetration depth. In this paper, we present synthetic aperture imaging with a virtual source (SA-VS) for an ophthalmic application using a high-frequency convex array transducer. The performances of the SA-VS were evaluated with phantom and ex vivo experiments in comparison with the conventional dynamic receive focusing method. Pre-beamformed radio-frequency (RF) data from phantoms and excised bovine eye were acquired using a custom-built 64-channel imaging system. In the phantom experiments, the SA-VS method showed improved lateral resolution (>10%) and sidelobe level (>4.4 dB) compared to those by the conventional method. The SNR was also improved, resulting in an increased penetration depth: 16 mm and 23 mm for the conventional and SA-VS methods, respectively. Ex vivo images with the SA-VS showed improved image quality at the entire depth and visualized structures that were obscured by noise in conventional imaging.

The Relations Between the Axial Aberrations of Photographic Lenses and Their Optical Transfer Functions

1966 ◽  
Vol 5 (3) ◽  
pp. 415 ◽  
Author(s):  
K. Rosenhauer ◽  
K.-J. Rosenbruch ◽  
F.-A. Sunder-Plassmann
Keyword(s):  
Transfer Functions ◽  
Optical Transfer

scholarly journals REGULARIZATION IMAGING ALGORITHM WITH ACCURATE G MATRIX FOR NEAR-FIELD MMW SYNTHETIC APERTURE IMAGING RADIOMETER

2014 ◽  
Vol 58 ◽  
pp. 193-203 ◽  
Author(s):  
Jianfei Chen ◽  
Yuehua Li ◽  
Jianqiao Wang ◽  
Yuanjiang Li ◽  
Yilong Zhang
Keyword(s):  
Near Field ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging ◽  
Imaging Algorithm
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