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polyanskiy / refractiveindex.info-database

Database of optical constants
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Missordering on sellmeier Coefficients #37

Closed hhartwell closed 2 years ago

hhartwell commented 2 years ago

Hello, just want to start by saying my team and I are super appreciative of this repo and all the work that went into creating it. This is a massive accomplishment and wonderful contribution. I would be super happy to lend a helping hand to this bug.

I am noticing that certain glass materials do not keep a consistent ordering to their formula coefficients. the examples i found were in the schott folder

Here, f5 is in an order that follows a pattern of b1, c1, b2, c2, b3, c3, Then k10 seems to break this pattern and go c1, b1, b2, c2, b3, c3 Here are some graphs that compare these two glasses and their resulting refractive index calculations. In these examples, the coefficients are pulled to match the k10 ordering. the blue line corresponds to data gathered from the refractive_index_db, and the red line corresponds to data our team has compiled

K10 F5

polyanskiy commented 2 years ago

Hi!

how exactly did you get coefficients from the database? Everything seems to be working fine with the web-interface:

https://refractiveindex.info/?shelf=glass&book=SCHOTT-K&page=K10 coefficients: 0 1.15687082 0.00809424251 0.0642625444 0.0386051284 0.872376139 104.74773

https://refractiveindex.info/?shelf=glass&book=SCHOTT-F&page=F5 coefficients: 0 1.3104463 0.00958633048 0.19603426 0.0457627627 0.96612977 115.011883

hhartwell commented 2 years ago

Oh my goodness thank you so much for the reply! we are pulling directly from the yml file into a list, and zipping them up with a predefined coefficient ordering. the files i have reflect exactly what you pasted. . . . i will close the issue and dig further into the bug we are dealing with and double check that the problem is on our side.

Again, thank you so much! We cannot emphasize enough how grateful we are to your work!

polyanskiy commented 2 years ago

Just in case: here is how the dispersion formulas are defined: https://refractiveindex.info/database/doc/Dispersion%20formulas.pdf