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Intrinsic properties of holographic recording materials: principles and devices used for an objective evaluation


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but thank you thank you Mr. Chairman I am pity that came from the University of the attention in Belgium and the title of my presentation is intrinsic properties of holographic recording materials principles and devices used for an objective evaluation so after a brief
introduction I will discuss the principles that of the methods that they use and there some of the experimental results obtained it's divided into 3 categories the 1st the heart of different jobs and the spectral sensitivity of the inventions on the diffraction years and modulation transfer function of the emissions and then the grain size analysis and then I will conclude for the Europe of
regions and the motivations of this work is because since a few years uh new emissions appear suggest Fujifilm loss of across project to laboratories Laboratory scale and holiday in university of fusion is involved in this request project for the characterization of new inventions so we focus in on the building of label fast and easy to use you the protestations to the devices and the 2 Overview the characterization procedure the 1st step is to to study the photometric behavior of the emissions and then knowing z the the western the emissions we will look at the capacity to of the mission store information and then we proceed to the grain size Menezes and in this presentation each that is restricted by the results obtained on some pretty fused Fujifilm graphic the image so that you can
1st the photometric behavior so that the emissions exposed to light darkening after developing and adapting can be expressed as the by the optical density so the logarithm of the inverse of the transmittance and if you plot if you draw the optical density versus the logarithm of the exposure it will give you the hotel different care it and each of the if this is right and if you can see it here this is the typical age because of an image and and the parameters you can extract for it's a very interesting such as the initial point so it I mean of the minimum energy needed to recover sign and they mention you can look at the slope of the curve so that gives you the contrast and you can look at some of the parameters such as the density function of the dimension so of the minimum density without any sign on and so on but of course discovery depends on the wavelength he recalled that the curve with so we using her letter we we built a device and that permits to recover 6 different uh jobs with 6 different you additional conditions on the same 5 to 4 inches plates so this is we have no function of my business 1 the of so it's a a problem that we we use of xenon lamp lamppost cells to to cover the war along with disability wavelength and with a monochromator to select only 1 particularly of wavelengths the initiative a collimating lens and a vertical slit this is very important so that we can just be radiates and this stripe on the on the emissions so that we can we regard civil strife mentioned by removing that relate here number 7 by moving moving the plates so we can got several uh the conditions on the emissions and before the invention it's important to events a so-called go back it it's like this it's a density that filter so that you can have in each of the different regions of conditions so this give different points to 2 to draw the curve now the problem is 1 of the problem was that the ancient because is that you have to make a lot of fun measurements of the optical density and can take care alot of time by the traditional method I
mean by using a manual densitometers and can consult of time and it's very sensitive to density it originating because you you only measure small surface on on the mission so the variations you you won't see it as chose to use to develop a solution based on a computer computer analysis of CCD camera shots like this 1 so the procedure is the following we acquire the pictures of the more developed plate and then we set the rates of the differently exposed rights just like this 1 on the left and the image Cyprus operates the different it is yeah yeah and after we have registered with levels of each so be sent by and we would do that averaging and so we calculate the corresponding optical density hits of very very fast method I can show you here the calibration job of the CCD camera so it shows you here those of the verdict I know it's so the optical densities and here it is so the uh gray level so you can see there is a nearly linear relationship in the main part of the of the care of so this leads to a very efficient 1st and we we label measurement methods offer a lot of optical densities and you can put very quickly he origin because it's so it's interesting cell some
results obtained on Fuji uncommitted fields so as you can see we recorded 3 pitch and because the blue 1 set of 413 meters the green 1 at 510 14 images and the red 1 at 633 nanometers so you can see that the sensitivity is quite the same in in the 3 columns and it's nearly half uh exactly the same for the blue and for the green but of course it really depends on the way you develop the mission and so so it's something difficult to be to be objective but anyway it from this gives you can obtain some parameters as the density for the it's will point in in this case the beginning of the curve so it's sort of the the slope of the curve of the initial point was cited about it's a a few minutes ago and what they called the reference exposure so I mean there's exposure needed to to reach reference optical density which is to to use of institute to so of course the parameters are quite the same for the Bruins from from the green curve you can see just by looking at the kills and the weather 1 this we show that the emission is so it's a bit more sensitive in the wet part of the of the spectrum but it's quite the same order and I would say if you if you wanted to recall the panchromatic hologram with that do you have the same condition in the blue and the green and to use about 25 % less exposure for for the web but for these weapons of course so it's in good agreement with that that she provided by physicians
and to and with the photometric behavior I will tell you a little about the spectral sensitivity curve it's just a comparison of the exposure needed to to reach the same with friends optical density but of course the the shape of the curve will depend on the reference density so it should only be considered as an indication of the when achieved sensitivities what you can see from this period is just so that the sensitivities are quite similar of the usual working at wavelength and if you want to use a connecting each if you can if we can say light you should use 1 between 5 thousand 50 and 500 and 900 meters it's in this region alright and we know how
those dimension reacts to the light we can see other holidays have ultimately God information so you know that's 0 grams quality depends on the ability of the mission to recover more less close in different in different fringes and therefore from the the ability to store information can be evaluated by the comparing the deflection years of gratings of various special frequencies expressing the light the mm so we use for the recording of several gratings with by various special frequencies the set of with a laser and of course the spatial filter limiting devices and we use a rotating plate with unlike type set of here it is the center of the mentioned here a mere at 90 degrees and obscuring window so experiment to on the right it's a small part of the sample so you can recall several good things on unsafe by moving the plate behind with this kind of set up gender the recall values writings and into depends on whether the special for cancer you can reach would depend on the wavelength used and you with this kind of so that you can we call access to age ratings on an on flight of density meters long so it's very very convenient and with the same set you can also determine the diffraction efficiencies diffraction years of each ratings just by moving the special filter and the connecting devices and the me so you you can use the you know the angle used for the recordings so it's very easy to to determine the diffracted intensity and these are the
results obtained on the Fujifilm uh in dimensions so in in blue it is the deflection years the evolution of the deflection years with special frequency as you can see it's the clues about how its capacities at about 2 thousand 600 so line them mm and it for at about 1 10th of the maximum capacities at about 3 or 3 thousand and spend 700 like them mm and the worker is just the modulation transfer function so it's related to the visibility of the fringes recorded in the securing and now the grain size analyzes
you know that well evangelists told about this uh the grain size influences the rule was having more of an emission and it would influence the way the mission can diffuse the light inside itself for especially in blue light so the diffraction unit can for done very quickly so it's important to know that z average grain size of the dimension and the most suitable techniques is the transmission electron microscope TEM but those simple preparation from could plate is a 2 or knowledge very difficult I tried several minutes but never really managed to to do so but at the last thing we tried this 2 and K is the emotion and networks you resonant it gets very very thin layers about 69 meters thing about your your tribe microtome but the problem is of course that some grains objects in the volume so you cannot say that the the dimension you see on the picture is is related to the real name diameter of the brain so you can only estimate the maximum grain size by looking at the as the bigger at looking grants so those 2 pictures has been taken on efficient and so and we can evaluate the Max maximum grain size of about 40 thousand meters it's also in accordance with the that the she that mean because they're size is supposed to be between 30 30 and 40 nanometres I think so it seemed to be a kid and we're also looking at a method to to deter mine the mean size a directly from the court place so we looked at the X-rays diffractometric but unfortunately it seems to overestimate the mean grain size as you can see here for the projections so it so it it gives a value of 50 50 years 59 mm it's quite big but it's not really consistent because with some Slavich plates really determined by this way 25 26 centimeters it's it's bigger than the than what what shows the TEM analyzes so X was diffractometry should be on considered as a method to quantitatively compare the sizes but notice an absolute method and they're
having concluded that we we try so to to build a reliable fast and easy to use you defraud stations student of devices to permit and as objective as possible I would say evolution of the nature of of the and the physical properties of holographic recording materials I mean in this case of survival like dimensions and the procedure permits to study the photometric behavior the ability to store information and the grain size with some limitations of 0 graphic conventions of course several commenters depend on some subjective preferences such as those exposure conditions at the and those of developing conditions also cancer depends on the references to convinced you choose for some parameters and so each of the parameters mind should be reconsidered depending on the application and when the experiences conditions unknown award analysis can be performed in a few days with but I would say 2 5 to 4 inches plates or things and if the if the motion is unknown so I would say we need to take care of so few weeks and 5 to 6 sentences to to do so and for our future works we we plan to to look at the stimuli automation of the devices are computerization of calculations and so on we also look at the improvement of the TEM sample preparation and some new parameters to to determine such as the emission layer thickness and some examples has been shown as shown in the previous presentation so that so and I think you have the intention fj I get from the wife of 1 thing yes and measurements using X-ray diffractometry and meaning some pictures the different results which do you think is more accurate than the maturity is so father T and the transmission electron microscope I think because if you look at them as X rays diffraction limit so that it's when the look at them which of of the picture on the different programs and from this the the can estimate of I mean grain size but it's also but there also influences of of the of the shape of the grains I mean is that not really is very concerned if you have some well I would say like 2 rings put someone 1 to each other it was separated in different ways and talk to experts in this field and only that it's maybe not a very accurate methods for for this kind of grants and for this scales also because I used to estimate the size of the size of something like 1 micron particles and so on and the method is supposed to be limited with this sort of a range of size but which we would like to we wanted to do tested because it's a very fast method and can be used directly on could take place that would be it would have been very convenient but really you can just look at quantitative comparisons in the world have you considered using other images so that should be considered for the the sensitivity using what these the the because what you're really interested in for the holography is the attitude transmission of the emotion rather than the patterns group on the on the on and like to the reality in the holographic attention from side and a number to of things about of the information could get from from this but from the kind of device really reuse I think we read we could do that from this end of the experiments but but uh I cannot say what is the information would be moral point everything else on by year by year by data mining is amplitude transmission and so on but we we can discuss about it later if you wanted it to be a very interesting thing and you can talk with 1st professor limited let's say the thank you to
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Formal Metadata

Title Intrinsic properties of holographic recording materials: principles and devices used for an objective evaluation
Title of Series 7th International Symposium on Display Holography (ISDH 2006)
Part Number 14
Number of Parts 61
Author Berken, Pierre-Yves
License CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
DOI 10.5446/21005
Publisher River Valley TV
Release Date 2012
Language English

Content Metadata

Subject Area Information technology

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