Results 1 to 10 of about 148,481 (207)
Snapshot Multi-Wavelength Birefringence Imaging [PDF]
SensorsA snapshot multi-wavelength birefringence imaging measurement method was proposed in this study. The RGB-LEDs at wavelengths 463 nm, 533 nm, and 629 nm were illuminated with circularly polarized light after passing through a circular polarizer.
Shuang Wang, Xie Han, Kewu Li
doaj +4 more sources
Multi-wavelength Flashes from GRBs [PDF]
International Astronomical Union Colloquium, 1995 The mystery of the nature and origin of gamma-ray bursts (GRBs) has persisted over two decades of intensive research, observational and theoretical. The basic problem is the absence of quiescent or transient counterparts at other wavelengths, resulting in distance scale uncertainties of more than 10 orders of magnitude.
D. H. Hartmann
openalex +2 more sources
Multi‐Wavelength Achromatic 3D Meta‐holography with Zoom Function [PDF]
Advanced ScienceWith the development of nanofabrication technology, meta‐holography has shown unprecedented potential for light regulation. However, due to the wavelength mismatch, chromatic aberrations are inevitable in multi‐wavelength meta‐holography. Moreover, since
Chao Liu +17 more
doaj +2 more sources
Novel Multi-Parametric Sensor System for Comprehensive Multi-Wavelength Photoplethysmography Characterization [PDF]
Sensors, 2023 Photoplethysmography (PPG) is widely used to assess cardiovascular health. However, its usage and standardization are limited by the impact of variable contact force and temperature, which influence the accuracy and reliability of the measurements ...
Joan Lambert Cause +4 more
doaj +2 more sources
A Review of Wearable Multi-Wavelength Photoplethysmography [PDF]
IEEE Reviews in Biomedical Engineering, 2023 Optical pulse detection 'photoplethysmography' (PPG) provides a means of low cost and unobtrusive physiological monitoring that is popular in many wearable devices. However, the accuracy, robustness and generalizability of single-wavelength PPG sensing are sensitive to biological characteristics as well as sensor configuration and placement; this is ...
Daniel Ray +2 more
exaly +4 more sources
Multi-wavelength structured light based on metasurfaces for 3D imaging [PDF]
NanophotonicsStructured light projection provides a promising approach to achieving fast and non-contact three-dimensional (3D) imaging. The resolution is a crucial index that represents security and accuracy in applications such as face recognition and robot vision.
Lyu Baiying +10 more
doaj +2 more sources
Nanophotonics, 2020 Multi-channel information encryption technology has been implemented by optical metasurfaces owing to their superior ability to control the phase, amplitude, wavelength and polarization of incident light.
Li Zhenfei, Premaratne Malin, Zhu Weiren
doaj +2 more sources
Large-field objective lens for multi-wavelength microscopy at mesoscale and submicron resolution
Opto-Electronic AdvancesConventional microscopes designed for submicron resolution in biological research are hindered by a limited field of view, typically around 1 mm. This restriction poses a challenge when attempting to simultaneously analyze various parts of a sample, such
Xin Xu +9 more
doaj +3 more sources
Astro-COLIBRI 2—An Advanced Platform for Real-Time Multi-Messenger Discoveries
Galaxies, 2023 The study of flaring astrophysical events in the multi-messenger approach requires instantaneous follow-up observations to better understand the nature of these events through complementary observational data.
Patrick Reichherzer +5 more
doaj +1 more source
Recognition of the finger vascular system using multi‐wavelength imaging
IET Biometrics, 2022 There has recently been intensive development of methods for identification and personal verification using the human finger vascular system (FVS). The primary focus of these efforts has been the increasingly sophisticated methods of image processing ...
Tomasz Moroń +4 more
doaj +1 more source