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Optical Microscope; • Scanning Electron Microscope (SEM ...

Lecture 3 Brief Overview of Traditional Microscopes Optical Microscope ; Scanning Electron Microscope (SEM); Transmission Electron Microscope (TEM); Comparison with Scanning probe Microscope (SPM) General philosophy Human beings use two kinds of means to gauge objectives : Seeing --- through eyes (light) Optical Microscope electronic Microscope (higher resolution due to short wavelength); Touching --- through hands (probe) SPM. Converting wavelength (nm) to Electron energy (eV): (nm), for example, a 500 nm light corresponds to = eV Principles of an Optical Microscope Development of Microscope takes us back to 400 years ago Robert Hooke s "Micrographia" (1665) A hair knot Room dusts Red blood cell Flu virus Organic nanobelts with strong emission Advantages and Disadvantages of Optical Microscope Advantages: Direct imaging with no need of sample pre-treatment, the only microscopy for real color imaging.

objectives: Seeing--- through eyes (light) ↔ optical microscope. ... BSE are often used in analytical SEM along with the spectra made from the characteristic X-rays. Because the intensity of the BSE signal is strongly ... response to 10 ug Meth simulant

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A Guide to Debouncing

my.eng.utah.edu

wandered in the hundreds of millivolts range for up to 8 msec. Then it suddenly snapped to a one. As the signal meandered up to near a volt the scope interpreted it as a one, but the analog’s continued uneasy rambles took it in and out of “one” territory. The MSO showered the screen with hash as it tried to interpret the data.

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se.unl.edu

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www.phon.ucl.ac.uk

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