Veleta

2k x 2k Side-Mounted TEM CCD Camera Solution

The Veleta is a side-mounted tem camera offering a Peltier-cooled CCD chip with 2k x 2k pixels and a dynamic range of 14 bits. The Veleta reflects current life science, bio-medicine, materials science and industrial requirements. this new camera works perfectly in conjunction with our tomography software, iITEM Solution Tomography. The Veleta is another component of EMSIS‘s vision of “Electron Microscopy made simple.”

Veleta

Diffraction image of aluminium

Diffraction image of aluminium

liver cell-nucleus

liver cell-nucleus

Dislocations in a low-angle grain-boundary (aluminium)

Dislocations in a low-angle grain-boundary (aluminium)

v1d

v1e

Muscle cell of a worm

Muscle cell of a worm

The pneumatically driven Veleta can be mounted onto the wide-angle (35 mm) port of almost all common TEMs. With attributes such as an optimized scintillator and a highly sensitive chip, this camera system guarantees high dynamic range and high sensitivity. Even weak signals can be recorded. Frame rates of more than 19 frames per second at binning 4 make it viable to search and focus directly onscreen. A Fire-WireTM  interface is used for trans- ferring data from camera to PC. The Veleta is fully integrated into iTEM, the TEM imaging platform. This means that the acquired images can be processed, evaluated, archived and documented – immediately and at the greatest of convenience.

Customized adapters
The camera system consists of a high yield phosphor screen, a prism to reflect the image onto the CCD sensor, as well as housing and a flange specific to each TEM. The rigidly coupled phosphor scintillator-lens-CCD combination is a fundamental prerequisite for ensuring optimum conditions for artifact-free shading correction.
The positioning of the phosphor screen inside the TEM is pneumatically driven. X-ray safety is guaranteed up to 200 KeV.

Special lens
In a partnership with lens makers of the highest caliber, the Veleta camera system is equipped with a new specially-designed lens. In conjunction with its state-of-the-art CCD chip and even more efficient scintillators, the custom optics of the Veleta system ensures much greater sensitivity and light efficiency, as well as a signal-to-noise ratio higher than ever before.

CCD chip
The highly sensitive CCD chip used in the camera system provides a maximum resolution of 2048 x 2048 pixels with a 14-bit dynamic range. In conjunction with further dark-current-reduction measures, this increases detection efficiency of the entire camera system. The CCD sensor has uniquely high quantum efficiency that when combined with reduced dark current results in a tremendous increase of the camera system‘s total detection quantum efficiency (DQE).

CCD Cooling
Noise – known as “dark current” – is generally introduced into an image if the CCD chip is not cooled to a sufficiently low temperature. This effect is not a problem with the Veleta due to its sophisticated Peltier-cooling system. The temperature of the CCD chip is regulated at 10° C (@ 25° C ambient temperature). Noise is further suppressed by highly efficient read-out technology.

High frame rates
Frame rates of more than 19 images per second at binning 4 and of 5 images per second at full resolution are supported. Such high frame rates are ideal for locating suitable sample segments directly onscreen. In conjunction with the RTFFT (Real Time Fast Fourier Transfor- mation), the focusing mode offers ideal assistance for setting various microscope parame- ters. This enables you to conveniently focus your sample on your PC screen as opposed to having to use the viewing screen of the microscope. No matter what mode you select, the Veleta offers excellent dynamic range and high sensitivity.

Binning
Binning modes help to increase camera sensitivity even more. The Veleta supports several binning modes: 2x, 4x.

Variable exposure times
The interline chip has an electronic shutter. The Veleta offers exposure times ranging from 1 ms to 100 s. This makes it possible to acquire images of intense illumination or of very low intensity.

High sensitivity
The Veleta‘s high sensitivity means samples can be observed on the monitor at
beam intensities so low, users would usually not be able to see anything on the TEM viewing screen.

Anti-Blooming / Diffraction
The CCD chip‘s interline-transfer architecture guarantees high anti-blooming. Individual pixels are clearly delineated using the Veleta. In conjunction with extremely short exposure times, this optimizes the acquisition of diffraction images.

Optimized scintillators
The Veleta uses optimized and highly sensitive phosphor scintillators. In order to match customers’ individual demands various scintillators can be customized to handle multiple accelerating voltages and applications.

FireWire™ technology
Data is transferred from the camera to the PC via FireWire™ (IEEE1394a) interface. This technology means the Veleta can be installed on any PC or laptop equipped with a FireWire™ port. No additional special frame grabber is necessary.

Real-time functions
Integration of the camera with iTEM and RADIUS, the EMSIS TEM imaging
platforms, ensures real-time shading correction, intensity histograms, auto contrast adjust- ment and real-time Fast Fourier Transformation during image acquisition.

Integration
The integration of the Veleta with iTEM and RADIUS provides professional functions such as autofocus, labeling, processing, archiving, analyzing and report generation. Photographic quality printouts are available in seconds after acquisition.

Ideal for tomography
The Veleta works perfectly in conjunction with our tomography software, iTEM Solution Tomography.

FEATURES
Up to 2048 x 2048 pixels
Peltier cooled
Lens coupled
14 bit
APPLICATIONS
Tomography
Diffraction
Materials Science
Virology
Pathology
Digital Documentation

Chip type

16.67 x 16.67 mm
interline CCD image sensor

Resolution (pixels)

2048 x 2048

Binning 2x (pixels)

1024 x 1024

Pixel size (µm)2

7.4 x 7.4

Effective pixel size (µm)2

13.1 x 13.1

Binning

2x, 4x

Pixel clock rate (MHz)

25

Frame rate (fps) 

5 @ full resolution (14 bit)

Frame rate (fps)

> 19 @ binning 4

Digitization (bit)

14

Exposure time

1 ms – 100s

Display

Full image in real time

Cooling

20°C regulated, Peltier-/Water-cooling with a dedicated chiller @ 25°C ambient temperature

Chip temperature

10° C @ 25° C ambient temperature

Camera mount

on wide angle port

Camera positioning

PC controlled pneumatic movement / control box

anti blooming

> 300x

PC Interface

FireWire TM (IEEE1394a)

Camera coupling

lens-optically coupled

Partial Readout

Yes

Full Well Capacity (e-)

40,000

Scintillator

High quality phosphor

CE certified

Yes

RoHS compliant

Yes