نتایج جستجو برای: optical instrument
تعداد نتایج: 346252 فیلتر نتایج به سال:
New fast detector technology has driven significant renewed interest in time-resolved measurement of early photons in improving imaging resolution in diffuse optical tomography and fluorescence mediated tomography in recent years. In practice, selection of early photons results in significantly narrower instrument photon density sensitivity functions (PDSFs) than the continuous wave case, resul...
PURPOSE The authors introduce a state-of-the-art all-optical clinical diffuse optical tomography (DOT) imaging instrument which collects spatially dense, multispectral, frequency-domain breast data in the parallel-plate geometry. METHODS The instrument utilizes a CCD-based heterodyne detection scheme that permits massively parallel detection of diffuse photon density wave amplitude and phase ...
The monitoring capability of a polarized instrument (POLDER) under high aerosol loading conditions over China is investigated. The aerosol optical thickness (AOT), which infers the aerosol burden, is used to measure the satellite monitoring capabilities. AOT products retrieved from POLDER on low aerosol loading days, and products from a radiometric instrument (MODIS) on high and low aerosol loa...
Spectra measured by remote-sensing Fourier transform infrared spectrometers are often calibrated using two calibration sources. At wavenumbers where the absorption coefficient is large, air within the optical path of the instrument can absorb most calibration-source signal, resulting in extreme errors. In this paper, a criterion in terms of the instrument responsivity is used to identify such w...
This article discusses a virtual slide guitar instrument, recently introduced in [7]. The instrument consists of a novel physics-based synthesis model and a gestural user interface. The synthesis engine uses energy-compensated time-varying digital waveguides. The string algorithm also contains a parametric model for synthesizing the tube-string contact sounds. The real-time virtual slide guitar...
The Atomic, Molecular and Optical Science (AMO) instrument at the Linac Coherent Light Source (LCLS) provides a tight soft X-ray focus into one of three experimental endstations. The flexible instrument design is optimized for studying a wide variety of phenomena requiring peak intensity. There is a suite of spectrometers and two photon area detectors available. An optional mirror-based split-a...
The radiometric sensitivity of the POLarization and Directionality of the Earth’s Reflectances (POLDER) instrument in the ocean color spectral bands (443, 490, and 565 nm) was checked vicariously by comparing top-of-atmosphere normalized radiances measured by the instrument with those computed for the same geometries using a radiative transfer model. In situ measurements of aerosol optical thic...
Colour and turbidity measurement. An instrument has been designed to measure colour and turbidity using solid state light sources and sensors operating at 470 nni (blue) and 880 nni (infrared) respectively. It is intended to be a factory instrument suitable for detecting break through from filters and colour gain or loss over scctions of plant in a refinery. The measurements are exprcssed in ab...
London instrument trade; their products included the early tripod and Marshall microscopes made of leather and wood; though in the eighteenth century the principal material of construction was brass. In Scotland John Finlayson was probably the first maker of microscopes (1743), and his compound microscopes were followed by a unique group of brass or silver simple microscopes made by John Clark....
We have configured the modulated optical solid-state spectrometer, a recently developed high-resolution instrument for plasma Doppler spectroscopy, as an imaging spectroscopic camera. The camera features a wide field of view ~;10°!, large aperture ~40 mm!, and high spectral resolution n/Dn greater than 10 000. The camera installation on the H-1NF Heliac is described, together with the steps in ...
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