Question to the Group: There is an option in the mirror configuration settings in DFTFringe to enter a value for the fringe spacing in waves. For double-pass interferometry, it makes sense that this v

I have found a few bugs in the Current version of DFTFringe. Mostly in the formatting of displays and reports. I have those fixed. I wonder if others have found some I don't know about. Give me your l

I appreciate the patience of Dale Eason in allowing me the occasional use of this Bath interferometer related forum to post an occasional reference to my SPPDI® product. For those who may be intereste

Dale, First of all sorry for my English, I hope you will understand me. I have a request and suggestion for a new option in DFTFringe software, which option would be very useful to me, and I believe f

Greetings You listed as having completed 2 Schmidt correctors. The idea of such is intriguing to me. Would you be able to and willing to share the hows? (A pointer to other's information would be quit

I thought the attached almost perfect astig removal result might be of interest, at least to Dale. I have used the astig removal tool many of times during testing mirrors, and my best results are usua

In the past testing large fast mirrors like a 42 inch F2.8 would be next to impossible using the standard Bath and DFTFringe. For one reason after adding enough tilt to separate the sidelobes the frin

Forgive me if I already tried this but I don't think I did. I would like a census of Bath users. In addtion a count of people that actually used one to make a mirror. So I think the way this should wo

https://opg.optica.org/oe/fulltext.cfm?uri=oe-16-23-18922&id=173178 (free download Open Access) is a 2008 paper describing a non fringe tracing iterative FFT based PSI method (with arbitrary phase shi

I managed to work through the 4 interferograms of the annular mirror that Steve posted and got pretty consistent, and maybe believable results. I can produce a script that I'll upload to my dropbox ac

Vastaanottaja: Interferometry@groups.io Aihe: Re: [Interferometry] bath Census On 5/21/2022 5:24 PM, Robert Hamers wrote: David Rowe, 3 mirrors, 2 test plates, 2 Schmidt correctors 2. Dale Eason, 1 mi

Dale, although I am not sure what you're after, I think realistically the group of users will be larger than only those who respond to your call. I'm certain that more people in NL, BE and GE also at

I had thought that I read somewhere that adding higher Zernike terms does not affect the value of lower terms when fitting terms to a surface. Is that the case? Right now for my implementation the SA

Over the winter I ground and finished a15" F-4.6 mirror and a 10" F-5.8 mirror using the mirror-o-matic machine I built. I used the SIT test to figure both mirrors and rechecked using the theoretical

I have been experimenting with using Mike Peck's implementation of Zernike polynomials. This will allow eventual use of annular polynomials and using them to smooth the wave front with many more terms

Often its useful to rotate the plane of polarisation of a interferometer source beam. If the source is linearly polarised then the source can sometimes be rotated. Often this isn't convenient and the

Sometimes you get comical results while trying to add code to DFTFringe. Here is my latest progress on using Mike's Zernike algorithm modified for DFTFringe. This a the round robin mirror loaded into

I have been trying to use MIke's implementation and compare his Zernike values with what DFTFRinge computes for various rho and theta values. A side discovery: From this document https://www.researchg

Dale Does DFTFringe support elliptical Zernikes? These are appropriate when testing a Newtonian diagonal in a plane wave Fizeau interferometer or a plane wave Twyman-Green interferometer as well as wh

Mike pointed to message 31132 that lists the null for an annular asphere. I could not find a definition of r and R in those equations. So I tried the wiki to understand them. Setting e to 0 to get bac