Results 11 to 20 of about 79,494 (306)

Integrated Encapsulation and Implementation of a Linear-Mode APD Detector for Single-Pixel Imaging Lidar

open access: yesPhotonics, 2023
Single-pixel imaging lidar is a novel technology that leverages single-pixel detectors without spatial resolution and spatial light modulators to capture images by reconstruction. This technique has potential imaging capability in non-visible wavelengths
Akang Lv   +6 more
doaj   +1 more source

Spot Invalid Point Repair Algorithm of Detector Array Measurement System Based on Image Correlation Coefficient

open access: yesPhotonics, 2023
The detector array method has been widely used in the field of high-energy laser far-field spot parameter measurement due to its ability to directly measure the far-field spot of high-energy lasers, wide dynamic range of the detectors, high system ...
Yilun Cheng   +6 more
doaj   +1 more source

Isolating the Gouy phase shift in a full physical-optics solution to the propagation problem [PDF]

open access: yes, 2022
S.1551-1558The Gouy phase shift has remained an object of fascination since its discovery by the eponymous scientist at the end of the nineteenth century.
Wyrowski, F.   +3 more
core   +1 more source

The Characterization of Haze and Dust Processes Using MAX-DOAS in Beijing, China

open access: yesRemote Sensing, 2021
Haze and dust pollution have a significant impact on human production, life, and health. In order to understand the pollution process, the study of these two pollution characteristics is important. In this study, a one-year observation was carried out at
Hongmei Ren   +13 more
doaj   +1 more source

UAVC: A New Method for Correcting Lidar Overlap Factors Based on Unmanned Aerial Vehicle Vertical Detection

open access: yesApplied Sciences, 2021
A method to calibrate the overlap factor of Lidar is proposed, named unmanned aerial vehicle correction (UAVC), which uses unmanned aerial vehicles (UAVs) to detect the vertical distribution of particle concentrations. The conversion relationship between
Ming Zhao   +5 more
doaj   +1 more source

Butterfly Optics Exceed the Theoretical Limits of Conventional Apposition Eyes [PDF]

open access: yes, 1987
Optical experiments on butterfly compound eyes show that they have angular sensitivities narrower than expected from conventional apposition eyes. This superior performance is explained by a theoretical model where the cone stalk is considered as a ...
Nilsson, D.-E.,   +3 more
core   +1 more source

Rare Earth Dopant (Nd, Gd, Dy, and Er) Hybridization in Lithium Tetraborate

open access: yesFrontiers in Physics, 2014
The four dopants (Nd, Gd, Dy, and Er) substitutionally occupy the Li+ sites in lithium tetraborate (Li2B4O7: RE) glasses as determined by analysis of the extended X-ray absorption fine structure. The dopants are coordinated by 6-8 oxygen at a distance of
Tony D. Kelly   +11 more
doaj   +1 more source

Unusual Enhancement of the Optical Depth on the Continental Shelf Depth Latitudinal Variation in the Stratospheric Polar Vortex

open access: yesRemote Sensing, 2023
The Antarctic ozone hole has attracted attention concerning global climate change. Breakthroughs regarding ozone observation methods and the formation principles of ozone holes have occurred.
Ziqiang Xu   +5 more
doaj   +1 more source

Double-sided fresnel zone plates as high performance optics in X-ray microscopy [PDF]

open access: yes, 2015
X-ray microscopy describes a range of analytical techniques, specialized for the characterization of organic and inorganic samples using high energy photons.
Mohácsi, István
core   +1 more source

Rapid and Sensitive Detection of Water Toxicity Based on Photosynthetic Inhibition Effect

open access: yesToxics, 2021
To achieve rapid and sensitive detection of the toxicity of pollutants in the aquatic environment, a photosynthetic inhibition method with microalgae as the test organism and photosynthetic fluorescence parameters as the test endpoint was proposed.
Min Chen   +7 more
doaj   +1 more source

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