How does reflected light determine particle size in particle counters?

[JoJoQuinoa]

I'm studying particle counters and one of the detection methods uses reflected light to determine the sizes of the particles. What principle does it base on?

Thanks!

 

[hutchphd]

There are many. One usually needs some other info like number of particles for instance. Your description is a little terse to specify

 

[JoJoQuinoa]

@hutchphd My apologies. This is from the slide I'm reading: "large particles scatter light through smaller angles and larger signals." The topic is fairly new for me so I don't know what details to consider yet. How about a single particle?

 

[Andy Resnick]

I'm studying particle counters and one of the detection methods uses reflected light to determine the sizes of the particles. What principle does it base on?

Thanks!

Optical methods typically use Mie scattering (or extensions thereof) to model particle sizes.

https://link.springer.com/book/10.1007/978-1-4757-1983-3