Results 231 to 240 of about 482,777 (285)

Fibre Optic Reflection Photometry on Blood

Cardiovascular Research, 1968
A two photocell assembly has been used to measure the light reflection of blood conducted by fibre optics. Fibre optic reflection spectra of oxygenated and reduced blood samples show an isobestic region around 850 nm. Non-specific variations of the light reflection from a mirror do not affect the ratio of detecting and compensating photocell outputs ...
Gerrit A. Mook   +3 more
openaire   +3 more sources

Statistics of intensity in adaptive-optics images and their usefulness for detection and photometry of exoplanets

open access: closedJournal of The Optical Society of America A-optics Image Science and Vision, 2010
This paper is an introduction to the problem of modeling the probability density function of adaptive-optics speckle. We show that with the modified Rician distribution one cannot describe the statistics of light on axis. A dual solution is proposed: the
Szymon Gładysz   +2 more
openalex   +2 more sources

Tapered Optical Fibers for Fluorescence Lifetime Photometry

Conference on Lasers and Electro-Optics, 2021
We describe a system exploiting a multi-anode array placed in the far-field plane of a tapered optical fiber to perform fluorescence lifetime photometry with depth-resolution in brain tissue.
Bianco M.   +9 more
openaire   +3 more sources

Absorption photometry of patterned deposits on IMPROVE PTFE filters

Journal of the Air and Waste Management Association
The IMPROVE program (Interagency Monitoring of PROtected Visual Environments) tracks long-term trends in the composition and optics of regional haze aerosols in the United States. The absorptance of red (633-nm) light is monitored by filter photometry of
Warren H White   +10 more
semanticscholar   +1 more source

Determination of optical constants by photometry

Journal of Physics D: Applied Physics, 1983
A recent study of the accuracies of determining the optical constants of thin films, for film thicknesses up to 0.04 lambda , has been extended to include film thicknesses up to 0.25 lambda , and the results are reported. It is shown that the method may also be applied to bulk materials.
openaire   +2 more sources

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