scholarly journals Computational Ghost Imaging Based on Light Source Formed by Coprime Array

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4508
Author(s):  
Yapeng Zhan ◽  
Jiying Liu ◽  
Zelong Wang ◽  
Qi Yu
Keyword(s):  
Background Noise ◽  
Spatial Light Modulator ◽  
Ghost Imaging ◽  
Light Modulator ◽  
Imaging Quality ◽  
Microwave Radar ◽  
Light Point ◽  
Uniform Array ◽  
Coprime Array ◽  
First Time

In computational ghost imaging, a spatial light modulator (SLM) can be used to modulate the light field. The relative locations and the number of light point pixels on an SLM affect the imaging quality. Usually, SLMs are two-dimensional arrays which are drawn uniformly or are randomly sparse. However, the patterns formed by a uniform array are periodic when the number of light point pixels is small, and the images formed by a random sparse array suffer from large background noise. In this paper, we introduce a coprime array based on the Eisenstein integer to optimize the light point pixel arrangement. A coprime array is widely used as a microwave radar receiving array, but less implemented in optics. This is the first time that a coprime array based on Eisenstein integer has been introduced in computational ghost imaging. A coprime array with this structure enhances the imaging quality when limited measurements are recorded, and it reduces background noise and avoids periodicity. All results are verified by numerical simulation.

Ghost Imaging with Spatial Light Modulator Based on Genetic Algorithm

2016 ◽  
Vol 36 (2) ◽  
pp. 0227002
Author(s):  
王凯 Wang Kai ◽  
黎全 Li Quan ◽  
林惠祖 Lin Huizu ◽  
孙帅 Sun Shuai ◽  
段振涛 Duan Zhentao ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Spatial Light Modulator ◽  
Ghost Imaging ◽  
Light Modulator

scholarly journals Wavefront shaping assisted design of spectral splitters and solar concentrators

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Berk N. Gün ◽  
Emre Yüce
Keyword(s):  
Experimental Method ◽  
Spatial Light Modulator ◽  
Large Scale ◽  
Low Cost ◽  
Optical Element ◽  
Light Modulator ◽  
Solar Concentrators ◽  
Spectral Splitting ◽  
Wavefront Shaping ◽  
First Time

AbstractSpectral splitters, as well as solar concentrators, are commonly designed and optimized using numerical methods. Here, we present an experimental method to spectrally split and concentrate broadband light (420–875 nm) via wavefront shaping. We manage to spatially control white light using a phase-only spatial light modulator. As a result, we are able to split and concentrate three frequency bands, namely red (560–875 nm), green (425–620 nm), and blue (420–535 nm), to two target spots with a total enhancement factor of 715%. Despite the significant overlap between the color channels, we obtain spectral splitting ratios as 52%, 57%, and 66% for red, green, and blue channels, respectively. We show that a higher number of adjustable superpixels ensures higher spectral splitting and concentration. We provide the methods to convert an optimized phase pattern into a diffractive optical element that can be fabricated at large scale and low cost. The experimental method that we introduce, for the first time, enables the optimization and design of SpliCons, which is $$\sim 300$$ ∼ 300 times faster compared to the computational methods.

Rugged Portable Grayscale Optical Correlator for Onboard Automatic Target Recognition Applications

2003 ◽  
Author(s):  
Tien-Hsin Chao ◽  
George Reyes ◽  
Hanying Zhou
Keyword(s):  
Spatial Light Modulator ◽  
Recent Progress ◽  
Automatic Target Recognition ◽  
Ferroelectric Liquid Crystal ◽  
Experimental Demonstration ◽  
Light Modulator ◽  
Jet Propulsion ◽  
Optical Correlator ◽  
First Time ◽  
Pixel Pitch

Jet Propulsion Laboratory (JPL) has developed, for the first time, a matchbox-size compact grayscale optical correlator (GOC). In this paper, we will report the recent development of a prototype 512 × 512 GOC utilizing a new miniature ferroelectric liquid crystal spatial light modulator (FLCSLM) with a 7-micron pixel pitch. We will discuss recent progress in the design and packaging technology to achieve a rugged portable GOC module to enable the real-time onboard applications of this miniature GOC. Experimental demonstration of ATR applications using this new GOC will be presented.

Coprime-frequencied sinusoidal modulation for improving the speed of computational ghost imaging with a spatial light modulator

2016 ◽  
Vol 14 (11) ◽  
pp. 111103-111106 ◽  
Author(s):  
Quan Li Quan Li ◽  
Zhentao Duan Zhentao Duan ◽  
Huizu Lin Huizu Lin ◽  
Shaobo Gao Shaobo Gao ◽  
Shuai Sun Shuai Sun ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Ghost Imaging ◽  
Light Modulator ◽  
Sinusoidal Modulation
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