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  • Cheetah Detectors Camera for TEM ED Model:Chee-tah120 Timepix / Chee-tah1800 Medipix3RX / Chee-tah(event) Timepix3
    These are fast and sensitive detectors for novel EM applications. ASI's Cheetah is a hybrid pixel detector suitable for EM applications. The sensitivity and speed of Cheetah offers unprecedented possibilities for ED, imaging and tomography. Scintillated detectors do not have the signal to noise ratio's that can be obtained with the Cheetah. Other direct electron cameras lack the dynamic range the Cheetah has and are too beam sensitive to be used for diffraction experiments. The Cheetah’s high speed makes it ideal for looking at dynamic processes and catching fast fading signals.

Introduction
Relevant

Amsterdam Scientific Instruments(ASI)

ASI develop and supply hybrid pixel detectors for a wide range of applications such as X-ray, electron microscopy and mass spectrometry imaging. Our innovative imaging solutions open up new opportunities in various industries by significantly sharper and faster imaging.


ASI’s Cheetah is a hybrid pixel detector suitable for electron microscope applications. The sensitivity and speed of Cheetah offers unprecedented possibilities for electron diffraction, imaging and tomography.

Scintillated detectors do not have the signal to noise ratio’s that can be obtained with the Cheetah. Other direct electron cameras lack the dynamic range the Cheetah has and are too beam sensitive to be used for diffraction experiments. The Cheetah’s high speed makes it ideal for looking at dynamic processes and catching fast fading signals.


“The Timepix detector combined with continuous rotation electron diffraction greatly improved the data quality and shortened the data collection time from hours to minutes. Ab initio structure determination by electron diffraction has now become as feasible as by X-ray diffraction, but from crystals thousands of times smaller than what are needed for X-ray diffraction.”

Prof. Xiaodong Zou 
Department of Materials and Environmental Chemistry at Stockholm University


Benefits of our detector

Asi offers three different versions which mainly differ in size and speed. The table right shows the comparisons between the three options. All cameras have the following properties:

• Single electron sensitivity 
• Zero readout noise, high Signal to Noise
• High dynamic range
• Background noise suppression through thresholding
• Short readout times and high framerates
• Increased high energy performance with high-Z sensor material


Advantages of our detectors

ASI’s novel ultra sensitive detectors provide a solution to study micro- and nanosized crystals by electron diffraction and can be mounted under existing electron microscopes. The high sensitivity together with a high-speed readout and high dynamic range allows users to collect data far beyond the limits set by CCD and CMOS cameras. For (4D) STEM applications this means quick scanning of large areas. Our versatile design makes our detector backward compatible with almost any electron microscope and can be further adjusted to the users’ demands.

The Timepix or Medipix3 chips provide single electron counting capabilities and almost infinite signal to noise ratio what makes them ideal for low dose experiments.
The fast readout (1800 fps) makes continuous data collection possible. For ED this means easier sampling of reciprocal space. For (4D) STEM this means faster scanning of large areas.


 


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