philip041 Messages 104 Reaction score 0 Thread starter Feb 16, 2009 #1 How on Earth do 'they' get a probe that close to a sample in SPM without it touching (in STM) or at just the right controlled amount?
How on Earth do 'they' get a probe that close to a sample in SPM without it touching (in STM) or at just the right controlled amount?
f95toli Science Advisor Messages 3,510 Reaction score 1,073 Feb 16, 2009 #2 You use very good feedback electronics (a PLL). This is combination with piezoelectric stacks that allow for very precise position control is the whole "secret", it is actually remarkably simple.
You use very good feedback electronics (a PLL). This is combination with piezoelectric stacks that allow for very precise position control is the whole "secret", it is actually remarkably simple.