The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Alan H. Windle - One of the best experts on this subject based on the ideXlab platform.
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A novel polymer fibre diffractometer based on a scanning x-ray sensitive charge-Coupled Device
Journal of Applied Crystallography, 1995Co-Authors: Simon Hanna, Alan H. WindleAbstract:This paper describes the development of a novel X-ray diffractometer, designed for the study of highly uniaxially oriented polymer fibres. The system is designed around a commercial X-ray-sensitive video camera, which is mounted on a three-circle goniometer. The active element in the X-ray camera is a charge-Coupled Device (CCD). The data-collection procedure consists of the combination of several diffraction images, obtained with the detector centred at different points in reciprocal space, to construct a composite diffraction pattern representing a linearized section through the symmetry axis of cylindrically averaged reciprocal space. By the combination of several images in this way, it is possible to overcome the traditional problem in fibre photography of information loss, caused by the Ewald-sphere curvature, close to the reciprocal fibre axis. Methods for optimizing the performance of the CCD detector, in terms of both its resolution and sensitivity, are discussed, and the data gathering and processing system is described in some detail. The operation of the system is demonstrated using samples of liquid-crystalline and conventional synthetic polymeric fibres.
Simon Hanna - One of the best experts on this subject based on the ideXlab platform.
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A novel polymer fibre diffractometer based on a scanning x-ray sensitive charge-Coupled Device
Journal of Applied Crystallography, 1995Co-Authors: Simon Hanna, Alan H. WindleAbstract:This paper describes the development of a novel X-ray diffractometer, designed for the study of highly uniaxially oriented polymer fibres. The system is designed around a commercial X-ray-sensitive video camera, which is mounted on a three-circle goniometer. The active element in the X-ray camera is a charge-Coupled Device (CCD). The data-collection procedure consists of the combination of several diffraction images, obtained with the detector centred at different points in reciprocal space, to construct a composite diffraction pattern representing a linearized section through the symmetry axis of cylindrically averaged reciprocal space. By the combination of several images in this way, it is possible to overcome the traditional problem in fibre photography of information loss, caused by the Ewald-sphere curvature, close to the reciprocal fibre axis. Methods for optimizing the performance of the CCD detector, in terms of both its resolution and sensitivity, are discussed, and the data gathering and processing system is described in some detail. The operation of the system is demonstrated using samples of liquid-crystalline and conventional synthetic polymeric fibres.
Richard H. Scheller - One of the best experts on this subject based on the ideXlab platform.
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Fluorescence detection in capillary zone electrophoresis using a charge-Coupled Device with time-delayed integration.
Analytical chemistry, 1991Co-Authors: Jonathan V. Sweedler, Jason B. Shear, Harvey A. Fishman, Richard N. Zare, Richard H. SchellerAbstract:A fluorescence detection system for capillary zone electrophoresis is described in which a charged-Coupled Device (CCD) views a 2-cm section of an axially illuminated capillary column. The CCD is operated in two readout modes: a snapshot mode that acquires a series of images in wavelength and capillary position, and a time-delayed integration mode that allows long exposure times of the moving analyte zones. By use of the latter mode, the ability to differentiate a species based on both its fluorescence emission and migration rate is demonstrated for fluorescein and sulforhodamine 101. The detection limit for fluorescein isothiocyanate (FITC) is 1.2 X 10(-20) mol; detection limits for FITC-amino acids are in the (2-8) X 10(-20) mol range.
Peter Kohl - One of the best experts on this subject based on the ideXlab platform.
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Temporal Pixel Multiplexing for simultaneous high-speed high-resolution imaging
Nature Methods, 2010Co-Authors: Matthias Tecza, Michiel Helmes, Peter KohlAbstract:By subdividing a charge-Coupled Device (CCD) array into subgroups using a digital micromirror Device and offsetting exposure times, temporal pixel multiplexing allows simultaneous high-speed and high-resolution imaging using a single CCD. This imaging modality allows 250 Hz microscopic imaging of fast cellular responses with a 10-Hz 1.3 megapixel camera.
Eric Lantz - One of the best experts on this subject based on the ideXlab platform.
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measurement of sub shot noise correlations of spatial fluctuations in the photon counting regime
Physical Review Letters, 2008Co-Authors: Jeanluc Blanchet, Luca Furfaro, Fabrice Devaux, Eric LantzAbstract:We have measured sub-shot-noise quantum correlations of spatial fluctuations in the far-field image of the parametric fluorescence created in a type I beta-barium-borate nonlinear crystal. Imaging is performed at very low light level (0.15 photons per pixel) with an electron multiplying charge Coupled Device camera. Experimental results overcome the standard quantum limit shot-noise level without subtraction of the variance of the detection noise.
