Search found 440 matches
- Tue Dec 07, 2021 10:50 am
- Forum: holoforum administration
- Topic: Insults and character assassination
- Replies: 16
- Views: 14534
Re: Insults and character assassination
If a question has been asked, the question must be answered, not deflected by insults. "(not the polarisation, which is a vector, as R. Rallison has published, and some holographers believe so fervently that they attempt to silence genuine criticism based on the literature of the subject , lik...
- Mon Dec 06, 2021 10:21 am
- Forum: The Dump
- Topic: emulsion thickness
- Replies: 4
- Views: 6716
Re: emulsion thickness
Those who comment on engineering matters who then expect to be "believed" as a matter of faith, don't have a lot of credibility with scientists and engineers. I suppose that's why I am currently busy working on multiple HOE projects with multiple clients, and you're sitting at home trolli...
- Sun Dec 05, 2021 1:21 pm
- Forum: AgX
- Topic: emulsion thickness
- Replies: 17
- Views: 17385
Re: emulsion thickness
I expect Mr. Pratheep can ask for clarification himself, if necessary after reading the linked information in my response. I used an Ocean Optics USB2000 spectrometer at Digilens for the measurement, and still do today.
- Sun Dec 05, 2021 9:28 am
- Forum: AgX
- Topic: emulsion thickness
- Replies: 17
- Views: 17385
Re: emulsion thickness
I'd remove some of the emulsion, clamp another plate of glass to the emulsion surface, and use the spectrometer to measure the air gap over the area removed. This method assumes an rms of zero, which it cannot be. Regardless, it will work fine as I used the technique for many years while at Digilens.
- Sat Dec 04, 2021 4:33 pm
- Forum: AgX
- Topic: emulsion thickness
- Replies: 17
- Views: 17385
Re: emulsion thickness
I'd remove some of the emulsion, clamp another plate of glass to the emulsion surface, and use the spectrometer to measure the air gap over the area removed.
- Sat Dec 04, 2021 10:06 am
- Forum: AgX
- Topic: emulsion thickness
- Replies: 17
- Views: 17385
Re: emulsion thickness
This is from way back: viewtopic.php?f=30&t=5798&p=46853&hilit ... c1c#p46853
- Fri Jul 30, 2021 9:05 am
- Forum: General Holography
- Topic: Bayfol
- Replies: 20
- Views: 11443
Re: Bayfol
I use large microscope slides from Ted Pella for cover glass, and Norland NOA107 UV cured adhesive for capping photopolymer holograms.
- Tue Mar 02, 2021 10:03 am
- Forum: Beginning Holography
- Topic: Hello and I have a transport not sure if it’s Motion or 70mm. Still
- Replies: 1
- Views: 7443
Re: Hello and I have a transport not sure if it’s Motion or 70mm. Still
It's a vintage film transport from the 1970s used to make holograms in an industrial environment. Quite obsolete. Film for it not made in decades. I'd be interested if you ever want to sell it, for display with similar old holography and laser equipment. There are much easier and cheaper ways to do ...
- Tue Feb 09, 2021 10:07 am
- Forum: General Holography
- Topic: Nick Brandreth’s Lippmann Plates
- Replies: 2
- Views: 2548
Re: Nick Brandreth’s Lippmann Plates
I notice in these videos that the round viewing aperture is also recorded into the image. I wonder if that means that the Lippmann photograph recorded the three dimensional position of the lens used to focus the image onto the plate?
- Tue Jan 19, 2021 10:07 am
- Forum: General Holography
- Topic: Mounting Photopolymer Film
- Replies: 3
- Views: 2634
Re: Mounting Photopolymer Film
Here's a sample, on 50x75mm glass. It's a recent HOE, with a palindrome number.