386 reputation
19
bio website
location
age
visits member for 2 years, 5 months
seen Jul 17 at 21:30

more a geek than a programmer still


Sep
24
awarded  Autobiographer
Nov
15
awarded  Commentator
Nov
15
comment do lenses with curved focal planes exist
Actually I started to go more into raytracing myself recently, and it does unravel a lot of "real world" artifacts and surprising things. For instance, I found that a "perfect", infinitely flat and aspheric fresnel lens had two surfaces with very good stigmatism (less than 0.05 degrees of error on the rays), valid from 0 up to more than 20° of incidence. But the two surface are unique, and both curved in a weird fashion. I will read and go deeper myself into it now :-)
Nov
15
comment do lenses with curved focal planes exist
Thank you very much for all these useful insights. And I'll definitely consider finding the book you mentioned, I have access to a huge library where I study!
Oct
20
comment do lenses with curved focal planes exist
that (the special manufacture process) is precisely what I wanted to avoid. But luckily, in my case, all comes together well (the focal plane of my consumer lens will be curved, but in the way I want it to be curved, so it's good for me). If you ever find some links about this design procedure (the method to design a lens that would have a focal plane with a specific curvature) let me know, I will read that with great interest!
Oct
20
comment do lenses with curved focal planes exist
Thanks for the term "Petzval curvature", as I was actually looking for some reference about this non-ideal effect. I will do more research on that on my own!
Oct
20
accepted do lenses with curved focal planes exist
Oct
19
asked do lenses with curved focal planes exist
May
22
awarded  Yearling
May
8
answered Application of plasma actuators for flow control of moving objects
May
8
answered Effect of electric field of plasma sheaths
May
8
answered Plasma Stability
May
8
awarded  Scholar
May
8
comment inductance value of a single turn thin circular coil
Great, this is exactly the kind of paper I was looking for. As expected by the canonical nature of the problem, the paper is quite old...but it looks correct! I will update if I can estimate the discrepancies between these formulas and the calculations with a good enough mesh! Thank you for your answer :-)
May
8
accepted inductance value of a single turn thin circular coil
May
8
revised inductance value of a single turn thin circular coil
correcting an error
May
7
awarded  Student
May
7
awarded  Editor
May
7
revised inductance value of a single turn thin circular coil
more work revealed my initial guesses were wrong, about scale effects
May
6
asked inductance value of a single turn thin circular coil