Search results for "Optical detector"

showing 3 items of 3 documents

Expansion cone for the 3-inch PMTs of the KM3NeT optical modules

2013

[EN] Detection of high-energy neutrinos from distant astrophysical sources will open a new window on the Universe. The detection principle exploits the measurement of Cherenkov light emitted by charged particles resulting from neutrino interactions in the matter containing the telescope. A novel multi-PMT digital optical module (DOM) was developed to contain 31 3-inch photomultiplier tubes (PMTs). In order to maximize the detector sensitivity, each PMT will be surrounded by an expansion cone which collects photons that would otherwise miss the photocathode. Results for various angles of incidence with respect to the PMT surface indicate an increase in collection efficiency by 30% on average…

Optical detector readout concepts; Instrument optimisation; Cherenkov detectorsPhotomultiplier[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE][PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]Instrument optimisationCherenkov detectorPhysics::Instrumentation and Detectors01 natural scienceslarge detector systems for particle and astroparticle physics; optical detector readout concepts; cherenkov detectors; instrument optimization.Photocathodelaw.inventionTelescopeOpticslaw0103 physical sciencesOptical detector readout conceptsNEUTRINO TELESCOPE010306 general physicsInstrumentationMathematical PhysicsCherenkov radiationPhysics010308 nuclear & particles physicsbusiness.industryLarge detector systems for particle and astroparticle physics[SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]DetectorCherenkov detectorsAstrophysics::Instrumentation and Methods for AstrophysicsInstrument optimizationINGENIERIA TELEMATICAOptical detector readout concept[SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]KM3NeTLarge detector systems for particle and astroparticle physicNeutrinobusinessPROJECTCherenkov detector85.60.Ha Photomultipliers ; phototubes and photocathodes ; 42.15.Dp Wave fronts and ray tracing ; 98.80.-k Cosmology ; 95.55.Vj Neutrino muon pion and other elementary particle detectors; cosmic ray detectors ; 29.40.Ka Cherenkov detectors
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Design and implementation of a portable fNIRS embedded system

2015

We report on the design, development and operation of a portable, low cost, battery-operated, multi-channel, functional Near Infrared Spectroscopy embedded system, hosting up to 64 optical sources and 128 Silicon PhotoMultiplier optical detectors. The system is realized as a scalable architecture, whose elementary leaf consists of a probe board provided with 16 SiPMs, 4 couples of bi-color LED, and a temperature sensor, built on a flexible stand. The hardware structure is very versatile because it is possible to handle both the switching time of the LED and the acquisition of the photodetectors, via an ARM based microcontroller.

Optical detectorsbusiness.industryComputer sciencePhotodetectorInfrared spectroscopyScalable architectureSilicon photomultiplierSettore ING-INF/01 - ElettronicaIndustrial and Manufacturing EngineeringSwitching timeMicrocontrollerSilicon photomultiplierEmbedded systemFunctional near-infrared spectroscopyFNIRS embedded systembusinessInfrared spectroscopyComputer hardware
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Validation of a spectral light scattering method to differentiate large from small particles in intraocular lenses

2017

A psychophysical approach has been designed to measure straylight from intraocular lenses (IOLs) in vitro. This approach uses a clinical straylight meter (C-Quant) and an observer's eye as optical detector. Based on this, we introduced a method for study of straylight-wavelength dependency for IOLs. This dependency can be used to distinguish between 2 types of scattering particles (small and large) as defined by Mie theory. Validation was performed using a turbidity standard and scattering filters. Several IOLs were analyzed to identify potential scattering sources. Large particles were found to predominate in scattering from the studied lenses. This was confirmed by straylight-angular depe…

genetic structuresForward scatterOptical detectorMie scattering01 natural sciencesLight scatteringArticle010309 optics03 medical and health sciencessymbols.namesake0302 clinical medicineOptics0103 physical sciencesJournal ArticleSmall particlesRayleigh scatteringPhysicsScatteringbusiness.industryequipment and suppliesAtomic and Molecular Physics and Opticseye diseasesIntraocular lenses030221 ophthalmology & optometrysymbolssense organsbusinessBiotechnologyBiomedical Optics Express
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