Holography Lecture by Thomas Grillo

[kisakk]

Thomas, did you add the Theremin-music after having digitized the video, or were you a theremin-player way back in the nineties as well?

I'd also like to ask what the motivation for making this video was in the first place. Did you have a business that you were promoting? Was it commissioned by someone? Or did you look into the future, sensing the vast possibilities of the Internet and simply will this thing into being?

Thank you SO much for all your wonderful videos, Grillo.

[ThomasGrillo]

@kisakk Thank you. The music was added to the video recently. As it was, the original video was a exciting as that guy who did the eyedrops commercial, and principal in Ferris Buler's Day Off. Had to do something. I shot this video back in the early 90s when I did have a business making holograms. It was originally intended to be, and did run on the public access channel in our area. It was also going to be marketed on dvd in a limited form at the time for educational puposes.

[MidnightDC696969]

its like 'This Old House' did a few micro dots

[ThomasGrillo]

I'm sure you're refering to the grainy, fuzzy resolution. :)

This video was shot on VHS in the mid 90s, and copied from a master which I nolonger have as it deteriorated. Thie video from which this video was produced was nearly oxidized too.

In just a few more years, the one copy that remains on VHS will have oxidized completely, and I'd never have been able to produce the video. This, and the dvd it's now backed up on is all that will be left in a few more years.

[rayunseitig]

...con't

a bit of thinking to do to even figure out what's going on here. I suspect we are seeing a 3d 'looking' image coming from 2 dimensional surfaces which have differing images recorded onto it which will be apparent when viewed from different angles. Like the lady in one image and then she is wearing a bathing suit if you view from a different angle.

Actually 2 pictures on 2 different 2 dimentional planes.

I'm really not sure you can get a 180 degree back side view from this.

[ThomasGrillo]

Lenticular images which use a lens sheet to distinguish between two, or more 2D images interlaced on a sheet of paper, or film work like this.

They, and certain types of holos (movie holos) can in fact display an animated sequence of an angel you wish after the subject has been filmed with conventional movie or video gear. Individual holos of each frame are recorded holographically.

There are also 180, and 360 degree holos which have been around since the 70s which use this same technique.

[ThomasGrillo]

...Further, The movie Logan's Run used 360 degree holograms as props for the interrogation scene in the movie.

These holos were produced by American Bank Note.

360 degree holos resemble an empty drum in the center of which is the reconstructed vertual image of the subject.

Conventional holos which are not produced using movie or video frames, where the model is holographed directly on a flat film only produce a 50 or 70+ degree field of view around the object.

[ThomasGrillo]

...further, There are 360 degree holos of objects which were simply placed in the center of the film holding drum, and imaged directly as a hologram. There is only 3D parallax, and no movie animation.

I recommend you consult the book "Holography Handbook" for far more information which will help you build a deeper understanding of holographic imaging.

[rayunseitig]

I was thinking of a 2 way mirror and a projected holographic image on that mirror which would be visible as would the actual image thru the mirror. I understand the silver halides will capute reflected light in the sence of photography.

I have

[ThomasGrillo]

Ah, I see what you're on about now. Yes, a reflecting mirror to make things look as if they were holograms projected in space would be interesting, yet you're right, they would still be limited to a frontal vew.

[rayunseitig]

Fascinating, Thankyou Sir. :-)

ray

[ThomasGrillo]

You're welcome.

[rayunseitig]

Great Stuff.

The idea of looking thru a half silvered mirror to see a real image and a halograph of that image at the same time is interesting. I don't know why. Perhaps in medical applications like halographs of xray's and ultra sounds. It seems like the imaging is still restricted to frontal and slight angular differences. The recording is reminiscent of how color film photography stores the RGB color info.

Great videos! Thanks

Ray

[ThomasGrillo]

Actually, I think you've misinterpreted the term "silver". Holos are photographic plates which contain silver halides.

Holos are full 3D volumetric records of a scene which you can look around objects in.

Holos can also be used to record CGI animation, which allows motion animation in the case of MRI, and Xray imaging. This means you can capture a 360 degree sequence, and record it into a hologram. Look at your credit card's holo. It's in 3D. The VISA is the best 3D holo on credit cards.

[jamxdan]

He really played down his current holography facilities... this guy is so great, i wish him the best in becoming extremely successful in the field!! Great Theremin music!!!!

[DoxDoigts]

Thanks Thomas.

Love the video and the information.

Love the Theremin music to. :-)

[ThomasGrillo]

Thanks for the kind words. ;)

[MrJeekz]

WoW i tried making holograms on cd cases,and i was facinated,but this is rly amazing.

[TheOneWhoGives]

love the moustache man. nice video.

[Maronatis]

Thank you very much for sharing this. It seems to be a very interesting hobby.

The music is also fantastic. Say, what is the name of the classical music piece that starts around 9:20?

[ThomasGrillo]

Thanks for the kind words. The music at 9:20 was Moonlight Sonata.

[Maronatis]

Thank you. :)

[Volker400]

How interesting and instructional!

Thanks very much for that, my dear Thomas!!

Yours,

Volker

[DeeAhTee]

Nice video! Very informative.

[Cosmicalex13]

I saw something like this on How Its Made. really cool.

[ThomasGrillo]

Thanks, I saw that episode of How it's Made. It's unfortunate, that they didn't go into very great detail, but still I enjoyed that episode.

[Cosmicalex13]

Yeah, kinda confusing though still. It looks like a hard technique.

[ThomasGrillo]

It is a hard technique in some cases. But once you get your hands on a holo kit, and try it, it all becomes much clearer with experience. It took me months to comprehend the lack of a camera or lens in holography except to spread the beams.

[Cosmicalex13]

ah. Well, it seems fun to mess around with.

[RoadRunnerLaser]

Hi, Thomas.

Please clarify.

You state that an aircraft HUD is an application of holography.

Perhaps my definition of holography does not tally with your own or my understanding of how a HUD works is incomplete or errant.

By my understanding:

A HUD is simply a reflection on an angled piece of glass. It's an application of "pepper's ghost". There's no need for coherent light and no reliance on interference and thus, not holography.

Do you consider "pepper's ghost" to be holography too?

[ThomasGrillo]

Were huds to use only a glass plate, the reflected image would be a tenth as bright as it needs to be. The solution was for hud makers to use a Holographic Optical Element (HOE) to regain the intensity of the source display device. An HOE is made using holographic imaging to produce the hud's business component. There are no lasers in huds, just the display, and the reflector.

HOE's let huds fit in tighter spaces while doing the same job of a 45 degree reflector.

I used to think the same.

[RoadRunnerLaser]

The HOE is the reflective surface?

Using the transparent "hologram" in place of the simple glass plate?

I think I understand now, thanks.

You've told me something I didn't know, too.

I'd misunderstood your explanation because I didn't realise that the "pepper's ghost" was intensified by the ingenious use of an holographic effect.

In layman's terms, would it be fair to say that (at the appropriate angles and wavelengths) the HOE is more reflective than a simple pane of glass?

[ThomasGrillo]

You understand right. And yes, the HOE will behave with varying intensities, and indeed hues at different angles. Most HOEs are produced in such a way that one does not have to angle the hud at a perfect 45 degree angle. This is done in the holo lab by setting the hud plate (with emulsion) at the angles it will be at in the cockpit, while the mirror is holographed at it's proper reflective angle. This allows huds to be built into cockpits where windscreen angles don't permit 45 degree mounts.

[RoadRunnerLaser]

Do you know what constitutes "proper reflective angle" for the mirror?

I've sent a much more detailed ramble in PM but you've really intrigued me with this idea. Have you ever tried taking holography of mirrors?

One of my all-time favourite holograms was of a microscope with an insect on the slide and by careful placing of the eye at the "virtual" eyepiece it was possible to view the magnified insect. Absolutely outstanding!

[ThomasGrillo]

The exact angles used are not known to me, other than one would set the mirror or lens to be imaged at the angles needed to perform, while the recording plate is set at the playback angle, with the reference beam entering the plate at a specific angle (varies with application needs)

That microscope holo got me hooked on holography. I still have it.

I made a holo at Lake Forest which features a lense near a phone with my name plate. It's an 8x10, and I have a small one of lens & med bottle.

[wendylouwho]

Great community cable, Thomas. You are a very enthusiastic sharer of your knowledge and it shows.

[BeFrSc]

Fantastic job Thomas, nice mostache to haha.

Glad you managed to get this video up after all this time. Congratulations.

[rtermini]

Great job Tom.