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The highly sensitive interline CCD image sensor used in the Veleta provides a resolution of 2048 x 2048 pixels at 14-bit dynamic range. The pixel size of the CCD chip is 7.4 x 7.4 μm (effectively 13.1 x 13.1 μm).
Several binning modes are supported by Veleta. The user can select between modes of 2x, 4x and 8x binning. This means sensitivity can be increased even more.
The Veleta supports frame rates up to 20 images per second at binning 4 and of 5 images per second at full resolution. This high frame rate is ideal for locating suitable sample segments directly onscreen.
Noise is generally introduced if the CCD chip is not cooled to a sufficiently low tem-perature, known as “dark current”. This thermal noise is not a problem with the Veleta due to a sophisticated Peltier-cooling system which regulates the temperature of the CCD chip at 10° C (@ 25° C ambient temperature).
The Veleta offers exposure times ranging from 100 μs to 160 s. This is a fundamental prerequisite for being able to acquire images of either intense illumination or of very low intensity.
The Veleta uses a dedicated high-sensitivity phosphor scintillator. In order to match customers’ individual demands, various scintillators can be customized for several accelerating voltages and applications.
The CCD chip architecture guarantees high anti-blooming. Individual pixels are clearly distinguished. In conjunction with the extremely short exposure times, this optimizes the acquisition of diffraction images.
Installing the Veleta is simple and straightforward. No additional water cooling and no other modifications at the TEM are necessary to set up the camera system. X-ray safety is guaranteed by the camera housing for up to 200 KeV.
Integration of the Veleta with iTEM, Olympus Soft Imaging Solutions TEM imaging platform, ensures Real-Time shading correction, intensity histograms, auto contrast adjustment and Real-Time Fast Fourier Transformations during image acquisition.
Furthermore, the integration of the camera with iTEM provides professional functions such as autofocus, labeling, processing, archiving, analyzing and report generation. Photographic quality printouts can be obtained virtually seconds after acquisition – without the darkroom.
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