EM – Cheetah

Cheetah 1800 installation.

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

AAI 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 threshold
•Short readout times and high frame-rates
•Increased high energy performance with high-Z sensor material


Our versatile detector can be used for many different applications within the field of Electron microscopy:
•Pharmaceutical Crystallography
•Catalysis (Zeolites and MOFs)
•Scanning Transmission Electron Microscope
•Electron Backscatter Diffraction
•Low Energy Electron Microscopy
•In-situ Electron Imaging

Protein Crystallography