Dots per pixel experiment

This was an experiment that I had performed. Here I started drawing some random dots (same size) in the circles. The circles have a radius of 1.5cm.

Starting with the top left corner, I put 250 dots and then kept increasing the dots eventually by a count of 250. Till I reached a total count of 2500 dots(bottom right corner).

The dots cannot be differentiated clearly, until we increment it by 250 dots.

In the last one, (bottom right corner) what is intriguing is the fact that crowding is taking place at the circumference of the circle.

Imaging with BSE

• SEM utilises Backscattered electrons (BSE's).
• BSE's : formed when incident electrons strike the sample and bounce back(elastic scattering)
• Elements with higher atomic numbers allow less BSE's: Higher contrast
• Aluminium Atomic Number: 13, Copper Atomic Number: 29

This is an image of an aluminium copper alloy formed using backscattered electron imaging. The light area is mostly copper and the dark area is mostly aluminium. [1]

Monte Carlo Simulation

Everhart-Thornley Detector: Variations

• (Wells 1970,1974, Ahmed and George 1972, Schiir et al. 1974,Harris et al. 1976, Zeldes and Tassa 1979) worked on a variation of the Everhart-Thornley Detector. [2]