نتایج جستجو برای: optical instrument
تعداد نتایج: 346252 فیلتر نتایج به سال:
An instrument fo r recording optical absorbance of s ingle living cells was demonstrated . The apparatus is based on a grating polychromator and measures absorbance simultaneously at several different wavelengths. It was designed for high-resolution recording while leaving cells accessible to multiple microelectrode impalement. The instrument has been used on nerve cells containing the indicato...
A turn-by-turn vertical beam profile monitor has been developed at the Cornell Electron Storage Ring (CESR). The instrument optically images the vertical beam distribution with an array of optical fibers that transport visible synchrotron radiation to an array of photo-multiplier tubes. Each PMT signal is recorded by a turn-by-turn data acquisition system. With this instrument, we compare profi...
PURPOSE To measure straylight in a cohort of patients with cataract using a novel optical instrument and to correlate optical straylight values with clinical grade of cataracts and psychophysical straylight values. METHODS Measurements were performed on 53 eyes of 44 patients with cataract admitted to the ophthalmology service of the university hospital in Murcia, Spain, and 9 young volunteer...
The X-ray Pump-Probe instrument achieves femtosecond time-resolution with hard X-ray methods using a free-electron laser source. It covers a photon energy range of 4-24 keV. A femtosecond optical laser system is available across a broad spectrum of wavelengths for generating transient states of matter. The instrument is designed to emphasize versatility and the scientific goals encompass ultraf...
We thank the reviewer for the valuable comments. A clarification will be made that the same set up applies for laboratory instruments. Indeed the semi-continuous (SC) instrument is not identical to the lab instrument but it does measure ECOC with the same thermal/optical method. The SC instruments participated in this comparison did n0t show any systematic deviating behavior or overall poor per...
We discuss an optical fiber-based continuous-wave coherent laser system for measuring the wind speed in undisturbed air ahead of an aircraft. The operational principles of the instrument are described, and estimates of performance are presented. The instrument is demonstrated as a single line of sight, and data from the inaugural test flight of August 2010 is presented. The system was successfu...
This paper presents the first live experimental results of a project aimed at developing semi-autonomy for a laparoscopic surgical robot. To achieve this goal, a special instrument-holder was designed with optical fibers and collimators. This instrument-holder projects laser dot patterns onto the organ surface which are seen in the endoscopic images. The instrument is manipulated by a commercia...
A method and an experimental measurement setup to accurately characterize the instrument transfer function in the spectral domain for hyperspectral spectrometers in the ultraviolet-visible wavelength range are described. The application to the on-ground calibration of the Ozone Monitoring Instrument (OMI) on board the Earth Observing System Aura satellite is presented and discussed. With this m...
This paper presents a robotic vision system that automatically retrieves and positions surgical instruments in robotized laparoscopic surgery. The surgical instrument is mounted on the end-effector of a surgical robot which can be controlled by automatic visual feedback. The goal of the automated task is to bring the instrument at a desired location from an unknown or hidden position. To achiev...
The fast-response resonance fluorescence instrument for the airborne measurement of carbon monoxide described by Gerbig et al. [1996] was modified by implementing an improved optical filter with more efficient optics and an optimized resonance lamp. Besides reductions in size and weight, the new instrument achieves a sensitivity 10 times higher, a lower background (65 ppb compared with 250 ppb)...
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