A Simulation is available since the Log 07/13/2017
Magnetic lens system Vacuum and electron beam
Not Started yet
High voltage shield for Arduino
Overview and Introduction of SEM
1965 was the first Scanning Electron Microscope (SEM) commercially available (wiki). 2011 Ben build the first SEM at home. He used special equipment to build it. Now 2017 I start to build the first SEM with common available components. I would like to create imanges like these.
I will not explain the principles of a SEM because the explanation on the homepage of ammrf.org.au is great and I can't do it better.
Also the overview video from Ben is great for the introduction. But for a deep understanding I recommend the book Physical Principles of Electron Microscopy from author Ray F. Egerton.
My plan is to go ahead with the following steps:
- Vacuum and electron beam
- Magnetic lens system
- Electron detector
- High voltage shield for Arduino
1. Build a simulation with a magnetic field simulation tool to determine the dimensions
2. Build a suitable vacuum and an electron beam
My internet search shows that common SEM uses a ultra high vacuum (UHV). This is required for function of the electron beam source. For the creation of the UHV a diffusion pump can be used. I plan to avoid a UHV be using approach developed by Delft University of Technology. They have shown...Read more »