Results 31 to 40 of about 700,724 (318)

IpDFT-Tuned Estimation Algorithms for PMUs: Overview and Performance Comparison

open access: yesApplied Sciences, 2021
The Interpolated Discrete Fourier Transform (IpDFT) is one of the most popular algorithms for Phasor Measurement Units (PMUs), due to its quite low computational complexity and its good accuracy in various operating conditions.
David Macii, Daniel Belega, Dario Petri
doaj   +1 more source

Effects of Assuming Constant Optical Scattering on Haemoglobin Concentration Measurements Using NIRS during a Valsalva Manoeuvre [PDF]

open access: yes, 2011
Resolving for changes in concentration of tissue chromophores in the human adult brain with near-infrared spectroscopy has generally been based on the assumption that optical scattering and pathlength remain constant.
Cooper, CE   +20 more
core   +1 more source

Measurements of Light Extinction by Single Aerosol Particles [PDF]

open access: yes, 2013
A Bessel beam optical trap is combined with continuous wave cavity ringdown spectroscopy to measure the extinction cross section of individual aerosol particles.
Reid, Jonathan P.   +3 more
core   +1 more source

Opto-Microfluidic System for Absorbance Measurements in Lithium Niobate Device Applied to pH Measurements

open access: yesSensors, 2020
The aim of Lab-on-a-chip systems is the downscaling of analytical protocols into microfluidic devices, including optical measurements. In this context, the growing interest of the scientific community in opto-microfluidic devices has fueled the ...
Riccardo Zamboni   +5 more
doaj   +1 more source

Measurements of the Beam-Wave Fluctuations over a 142-km Atmospheric Path [PDF]

open access: yes, 2006
An optical link has been established between the Canary Islands La Palma and Tenerife. A 1064-nm transmitting laser was located on La Palma whereas a BPSK communication receiver and measurement instruments were installed in ESA's OGS on Tenerife.
Perlot, Nicolas   +11 more
core   +1 more source

Delta function of the Fourier transform [PDF]

open access: yesE3S Web of Conferences
In the analysis of the double window Fourier transform, it is found that both components of the direct transformation contain an equal amount of information sufficient to restore the original time signal. A double conversion diagram has been constructed.
Parfentyev Nikolay   +2 more
doaj   +1 more source

Multi-Sensor System For Level Measurements With Optical Fibres [PDF]

open access: yes, 2002
A system for measuring liquid level in multiple tanks using optical fibre technology has been developed. The oil field service industry can benefit from this intrinsically safe technology.
Sánchez-Pena, José Manuel   +3 more
core   +1 more source

Measuring Quantum Optical Hamiltonians [PDF]

open access: yesPhysical Review Letters, 1998
We show how recent state-reconstruction techniques can be used to determine the Hamiltonian of an optical device that evolves the quantum state of radiation. A simple experimental setup is proposed for measuring the Liouvillian of phase-insensitive devices.
D'Ariano, G. M., Maccone, L.
openaire   +2 more sources

A comparison of optical and radar measurements of mesospheric winds and tides [PDF]

open access: yes, 2000
Optical measurements of mesospheric winds by Fabry‐Perot spectrometers, FPSs, at Mawson, 67.6°S 62.9°E, and Davis, 68.6°S 78.0°E, Antarctica are compared with similar measurements obtained using a spaced‐antenna MF radar at Davis.
Vincent, R.   +3 more
core   +1 more source

Research of dispersion characteristics of optical glass

open access: yesКомпьютерная оптика
Dispersion characteristics of optical glass are considered. An approach to research of dispersion characteristics of optical glass is proposed, requiring the measurement of the refractive index at only three wavelengths, which simplifies the measurement ...
A.I. Yurin, G.N. Vishnyakov, V.L. Minaev
doaj   +1 more source

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