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High Speed Side-mounted TEM Camera System
Key features
MegaView
  • Up to 1376 x 1032 pixels
  • More than 25 fps @ binning 2
  • Peltier-cooled
  • Lens-optically coupled
  • 14 bit
Summary
The fast and high resolution MegaViewG2 fits to the wide-angle (35 mm) port of almost all common TEMs. The pneumatically driven camera offers high resolution, optimized scintillators and a highly sensitive chip. This combination guarantees a camera system with high dynamic range and high sensitivity. It also means that weak signals can be recorded. Frame rates of more than 25 frames per second at binning 2 make it viable to search and focus directly onscreen. A FireWire interface is used for transferring data from camera to PC. The total integration of the camera into iTEM, the TEM imaging platform, means that the acquired images can be processed, evaluted, archived and documented - immediately and at the greatest of convenience.
Description Specifications
The MegaViewG2 is the 2nd generation of Olympus Soft Imaging Solutions high resolution and high side-mounted TEM CCD camera system. This lens-coupled 14-bit camera offers a comprehensive concept composed of the latest in electronics, optics, design and functionality. The MegaViewG2 is equally appealing to users in the bio-medical, life sciences, and materials science.
The side mounted MegaViewG2 is attached on the 35mm camera port of the TEM column. The camera is pneumatically inserted into the column so only one port is required to attach the camera to the microscope. The MegaViewG2 has peltier cooling so external connections are not necessary, eliminating the possibility of leaks and corrosion. All data is transferred by FireWireTM to the PC. The iTEM imaging platform allows total control of the camera and integration into the microscope system allowing for smooth, user-friendly operation.
Customized adapters
The MegaViewG2 consists of a high yield phosphor screen, a prism to reflect the image onto the CCD sensor, as well as housing and flange specific to each TEM. The rigid coupled phosphor scintillator-lens-CCD combination provides optimum conditions for an 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 optics
The MegaViewG2 camera system is equipped with especially designed lens optics. In conjunction with the CCD chip and the even more efficient scintillator the improved optics of the MegaViewG2 system ensures greater sensitivity and light efficiency, as well as a signal-to-noise ratio higher than ever before.
CCD Chip
The highly sensitive 2/3” interline CCD image sensor used in the MegaViewG2 provides a resolution of 1376 x 1032 pixels at 14-bit dynamic range. The pixel size of the CCD chip is 6.45 x 6.45 µm² (effectively ~20 x 20 µm²). The CCD sensor possesses a uniquely high quantum efficiency, which in combination with reduced dark current results in a tremendous increase of the total detective quantum efficiency (DQE) of the camera system. Minimizing power consumption has made external camera cooling unnecessary.
Binning
Several binning modes are supported by the MegaViewG2. The users can select between modes of 1x, 2x, 4x and 8x binning. This means sensitivity can be increased even more.
High Frame rates
The MegaViewG2 supports frame rates of more than 25 images per seconds at 2x binning and of 15 images per seconds at full resolution. This high frame rate is ideal for locating suitable sample segments directly onscreen or adjusting the microscope parameters. At any resolution the camera provides excellent dynamic range and sensitivity.
Cooling
Noise is generally introduced into an image if the CCD chip is not cooled to a sufficiently low temperature, known as “dark current”. This thermal noise is not a problem with the MegaViewG2 due to a sophisticated Peltier-cooling system which regulates the temperature of the CCD chip at 10° C (@ 25° C ambient temperature). Noise is further suppressed by highly efficient read-out technology.
Variable exposure times
The MegaViewG2 offers exposure times ranging from 100 µs to 160 seconds. This is a fundamental prerequisite for being able to acquire images of either intense illumination or of very low intensity
Optimized scintillators
The MegaViewG2 uses optimized high sensitivity phosphor scintillators. In order to match customers’ individual demands various scintillators can be customized for several accelerating voltages and applications.
Anti-Blooming / Diffraction
The interline architecture of the CCD chip provides a very good isolation of the individual pixels resulting in an extremely high anti-blooming value. This, in conjunction with the extremely short exposure times possible with the camera, makes possible the acquisition of diffraction patterns.
Real-time functions
Integration of the MegaViewG2 into 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.
Integration
Integration of the camera into iTEM provides professional functions like autofocus, labeling, processing, archiving, analyzing and report generation. Photographic quality printouts can be obtained virtually in seconds after acquisition – without the darkroom.
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