Automatic Estimation of the Spatial Resolution for CBERS CCD Camera

2009 ◽  
Author(s):  
Kamel Bensebaa
Keyword(s):  
Spatial Resolution ◽  
Ccd Camera ◽  
Automatic Estimation

scholarly journals A new device to mount portable energy-dispersive X-ray fluorescence spectrometers (p-ED-XRF) for semi-continuous analyses of split (sediment) cores and solid samples

2017 ◽  
Vol 6 (1) ◽  
pp. 93-101 ◽  
Author(s):  
Philipp Hoelzmann ◽  
Torsten Klein ◽  
Frank Kutz ◽  
Brigitta Schütt
Keyword(s):  
Spatial Resolution ◽  
Atlantic Coast ◽  
Sediment Cores ◽  
Ccd Camera ◽  
Energy Dispersive ◽  
Solid Samples ◽  
Industrial Property ◽  
X Ray ◽  
New Device ◽  
Sample Chamber

Abstract. Portable energy-dispersive X-ray fluorescence spectrometers (p-ED-XRF) have become increasingly popular in sedimentary laboratories to quantify the chemical composition of a range of materials such as sediments, soils, solid samples, and artefacts. Here, we introduce a low-cost, clearly arranged unit that functions as a sample chamber (German industrial property rights no. 20 2014 106 048.0) for p-ED-XRF devices to facilitate economic, non-destructive, fast, and semi-continuous analysis of (sediment) cores or other solid samples. The spatial resolution of the measurements is limited to the specifications of the applied p-ED-XRF device – in our case a Thermo Scientific Niton XL3t p-ED-XRF spectrometer with a maximum spatial resolution of 0.3 cm and equipped with a charge-coupled device (CCD) camera to document the measurement spot. We demonstrate the strength of combining p-ED-XRF analyses with this new sample chamber to identify Holocene facies changes (e.g. marine vs. terrestrial sedimentary facies) using a sediment core from an estuarine environment in the context of a geoarchaeological investigation at the Atlantic coast of southern Spain.

scholarly journals Geometric quality assessment of CBERS-4 MUXCAM image

2016 ◽  
Vol 4 (2) ◽  
pp. 116
Author(s):  
Thiago Statella
Keyword(s):  
Spatial Resolution ◽  
Ccd Camera ◽  
High Accuracy ◽  
Fourth Generation ◽  
Multispectral Images ◽  
Geometric Correction ◽  
Positional Accuracy ◽  
Geometric Quality ◽  
Better Than

In December 2014, Brazil and China successfully launched the CBERS-4 satellite, the fourth generation of CBERS satellites. In the payload module, the satellite carries the MUXCAM, a 20 m/pixel spatial resolution multispectral camera. The MUXCAM was built by Brazil and it is an improvement of the CCD camera on board CBERS-1, 2 and 2B satellites. In this paper the geometric quality of the MUXCAM images is analyzed. One can measure the geometric quality of the CCD sensor by calculating the positioning and the internal accuracy of the images acquired by it. The positional accuracy for the MUXCAM resulted in ~404 m whereas the internal accuracy resulted in ~30 m, better than 2 pixels. Therefore, in less rigorous applications in which a high accuracy in coordinates is not mandatory, and in which such errors can be neglected, the multispectral images acquired by MUXCAM can be used without a prior geometric correction.    

Determination of the Regional Function of the Heart

2002 ◽  
Author(s):  
Evren U. Azeloglu ◽  
Glenn R. Gaudette ◽  
Irvin B. Krukenkamp ◽  
Fu-Pen Chiang
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Speckle Pattern ◽  
Strain Tensor ◽  
Ccd Camera ◽  
Speckle Interferometry ◽  
Left Ventricular ◽  
Stroke Work ◽  
Regional Function

Unlike many other engineering designs, the heart, a pressure vessel, shows variations within its chambers and surface in terms of mechanical function. This necessitates a whole field technique with high spatial resolution. Computer aided speckle interferometry (CASI), a nondestructive examination technique, is herein developed for this purpose. A speckle pattern was created on the surface of isolated rabbit hearts. Images of the beating hearts werc acquired with a charge-couple device (CCD) camera for one second at a rate of 50 frames per second. CASI was used to determine the 2-D displacement vectors over regions of approximately 4 × 6 mm. Regional area stroke work (the integral of the left ventricular pressure with respect to area), the first invariant of the 2-D strain tensor, and the principle strains were used to determine the regional function. After occluding the blood supply to a region of the heart, significant changes were detected in all the previously mentioned parameters. Commonly used techniques cannot determine 2-D strain and lack the high spatial resolution of CASI. Determination of the 2-D strain can provide useful data on the functionality of the heart.

Full-Disk solar Dopplergrams observed with a 1024 × 1024-Pixel CCD Camera

1988 ◽  
Vol 123 ◽  
pp. 471-474
Author(s):  
Edward J. Rhodes ◽  
Alessandro Cacciani ◽  
Steven Tomczyk
Keyword(s):  
Spatial Resolution ◽  
Optical Filter ◽  
Ccd Camera ◽  
Solar Oscillations ◽  
Heliospheric Observatory ◽  
Full Disk

We present here the first full-disk solar Dopplergram obtained with the new 1024 × 1024-pixel CCD camera which has recently been installed at the 60-Foot Tower Telescope of the Mt. Wilson Observatory. This Dopplergram has a spatial resolution of 2.2 arcseconds and was obtained in less than one minute of time. The Dopplergram was obtained with a magneto-optical filter which was designed to obtain images in the two Na D lines. The filter and the camera were operated together as part of the development of a Solar Oscillations Imager (SOI) esperiment which is currently being designed at JPL for the joint NASA/ESA Solar and Heliospheric Observatory (SOHO) mission.

Development of a WDX-μ-PIXE system for chemical state mapping

2014 ◽  
Vol 24 (03n04) ◽  
pp. 111-120 ◽  
Author(s):  
S. Toyama ◽  
S. Matsuyama ◽  
K. Ishii ◽  
A. Terakawa ◽  
K. Kasahara ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Energy Resolution ◽  
Detection Efficiency ◽  
Chemical Shifts ◽  
Ccd Camera ◽  
High Energy ◽  
Chemical State ◽  
High Energy Resolution ◽  
Clay Particles ◽  
X Ray

In this paper, we have developed a wavelength dispersive X-ray spectrometer microparticle-induced X-ray emission (WDX-[Formula: see text]-PIXE) system combining a microbeam system with high spatial resolution and wavelength dispersive X-ray (WDX) spectrometry with high-energy resolution for chemical state mapping. A Von Hamos geometry was used for the WDX system to achieve higher detection efficiency and energy resolution. The system consists of a curved crystal and a CCD camera. The WDX system was installed in a newly developed microbeam system. The energy resolution of the WDX system was 0.67 eV for [Formula: see text] (1740 eV). [Formula: see text] and [Formula: see text] X-ray spectra from various Si compounds were measured and chemical shifts related to chemical states were clearly observed. The system was applied to the chemical state analysis of clay particles. After elemental mapping of the clay particles using a conventional [Formula: see text]-PIXE system with a Si(Li) detector, particles to be analyzed were selected and analyzed sequentially with the WDX system. [Formula: see text] spectra from clay particles were obtained. The microscopic spatial distribution of elements and chemical state of the clay particles were sequentially measured with high energy and spatial resolution using a microbeam.

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