Compact freeform illumination optics design by deblurring the response of extended sources

2021 ◽  
Author(s):  
Donglin Ma ◽  
ShiLi Wei ◽  
Zhu Zhengbo ◽  
WENYI LI
Keyword(s):  
Extended Sources ◽  
Optics Design

scholarly journals Freeform optics design for extended sources in paraxial approximation exploiting the expectation maximization algorithm

2020 ◽  
Vol 28 (24) ◽  
pp. 37004
Author(s):  
Annika Völl ◽  
Michael Berens ◽  
Rolf Wester ◽  
Paul Buske ◽  
Jochen Stollenwerk ◽  
...  
Keyword(s):  
Expectation Maximization ◽  
Expectation Maximization Algorithm ◽  
Paraxial Approximation ◽  
Freeform Optics ◽  
Extended Sources ◽  
Optics Design

A TELESCOPE MOUNTED MOCK INTERFEROMETER FOR USE ON EXTENDED SOURCES

1967 ◽  
Vol 28 (C2) ◽  
pp. C2-144-C2-149 ◽  
Author(s):  
M. J. SELBY ◽  
L. W. THORPE
Keyword(s):  
Extended Sources

scholarly journals Detectivity optimization to detect of ultraweak light fluxes with an EM-CCD as binary photon counter array

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ibtissame Khaoua ◽  
Guillaume Graciani ◽  
Andrey Kim ◽  
François Amblard
Keyword(s):  
Dynamic Range ◽  
Signal To Noise Ratio ◽  
Photon Counting ◽  
Detection Methods ◽  
Strong Nonlinearity ◽  
Wide Range ◽  
Depth Analysis ◽  
Spatially Extended ◽  
Extended Sources ◽  
Photon Counting Mode

AbstractFor a wide range of purposes, one faces the challenge to detect light from extremely faint and spatially extended sources. In such cases, detector noises dominate over the photon noise of the source, and quantum detectors in photon counting mode are generally the best option. Here, we combine a statistical model with an in-depth analysis of detector noises and calibration experiments, and we show that visible light can be detected with an electron-multiplying charge-coupled devices (EM-CCD) with a signal-to-noise ratio (SNR) of 3 for fluxes less than $$30\,{\text{photon}}\,{\text{s}}^{ - 1} \,{\text{cm}}^{ - 2}$$ 30 photon s - 1 cm - 2 . For green photons, this corresponds to 12 aW $${\text{cm}}^{ - 2}$$ cm - 2 ≈ $$9{ } \times 10^{ - 11}$$ 9 × 10 - 11 lux, i.e. 15 orders of magnitude less than typical daylight. The strong nonlinearity of the SNR with the sampling time leads to a dynamic range of detection of 4 orders of magnitude. To detect possibly varying light fluxes, we operate in conditions of maximal detectivity $${\mathcal{D}}$$ D rather than maximal SNR. Given the quantum efficiency $$QE\left( \lambda \right)$$ Q E λ of the detector, we find $${ \mathcal{D}} = 0.015\,{\text{photon}}^{ - 1} \,{\text{s}}^{1/2} \,{\text{cm}}$$ D = 0.015 photon - 1 s 1 / 2 cm , and a non-negligible sensitivity to blackbody radiation for T > 50 °C. This work should help design highly sensitive luminescence detection methods and develop experiments to explore dynamic phenomena involving ultra-weak luminescence in biology, chemistry, and material sciences.

Acoustic texture rendering for extended sources in complex scenes

2019 ◽  
Vol 38 (6) ◽  
pp. 1-9 ◽  
Author(s):  
Zechen Zhang ◽  
Nikunj Raghuvanshi ◽  
John Snyder ◽  
Steve Marschner
Keyword(s):  
Complex Scenes ◽  
Extended Sources ◽  
Texture Rendering

A freeform optics design with limited data for extended LED light sources

2016 ◽  
Vol 63 (21) ◽  
pp. 2151-2158 ◽  
Author(s):  
Zhenfeng Zhuang ◽  
Phil Surman ◽  
Feihong Yu
Keyword(s):  
Light Sources ◽  
Limited Data ◽  
Led Light ◽  
Freeform Optics ◽  
Optics Design

Penetration effects in scintiscanners collimators from gamma extended sources

1981 ◽  
Vol 58 (1-2) ◽  
pp. 53-58
Author(s):  
B. A. Bishara ◽  
Z. A. Mohsen
Keyword(s):  
Extended Sources
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