- Видео 78
- Просмотров 231 544
Andrew Berger
Добавлен 12 дек 2011
Scanning confocal microscopy
Comparison of traditional mirror-scanned confocal microscopy and the method of spectral encoding, which requires no mirror for the equivalent scan.
Просмотров: 924
Видео
STED and STORM
Просмотров 5 тыс.5 лет назад
Superresolution microscopy techniques: introduction to, and comparison of, stimulated emission depletion microscopy (STED) and stochastic optical reconstruction microscopy (STORM).
Optical Coherence Tomography I
Просмотров 23 тыс.5 лет назад
First part of an introduction to OCT, explaining the fundamentals and the time-domain application.
Optical Coherence Tomography II
Просмотров 10 тыс.5 лет назад
Second part of an introduction to OCT, explaining the spectral domain approach.
Elastic Scattering Spectroscopy
Просмотров 6765 лет назад
How measuring scattered light versus wavelength or angle can provide estimates of the size of a scatterer.
West Side Story Lexington High School 1986
Просмотров 1 тыс.5 лет назад
Saturday night cast dress rehearsal of West Side Story, transferred professionally from glorious VHS (it gets better after the very beginning).
Intro to Chemometrics, part 2
Просмотров 1,7 тыс.5 лет назад
Second of two tutorials on how to extract chemical concentrations from multivariate spectral data.
Intro to Chemometrics
Просмотров 11 тыс.5 лет назад
First of two tutorials on how to extract chemical concentration information from spectroscopic data.
Raman Spectroscopy Intro
Просмотров 4225 лет назад
Introduction to basic concepts of Raman spectroscopy and how the method differs from fluorescence.
Fluorescence Basics
Просмотров 2695 лет назад
Introductory concepts for fluorescence as it applied to biomedical optics.
Frequency domain photon migration
Просмотров 2435 лет назад
Derivation of the point source solution to the photon diffusion equation in the frequency domain.
SemiInfinite
Просмотров 2765 лет назад
Explaining how to satisfy the boundary conditions for photon distribution in a semi-infinitetissue geometry.
Boltzmann Transport Equation
Просмотров 8 тыс.5 лет назад
Explanation of the various gain and loss terms in the Boltzmann transport equation, which is the starting point for modeling how light propagates in highly scattering media such as many biological tissues.
Diffusion Equation
Просмотров 1 тыс.5 лет назад
Motivating how the photon diffusion equation is developed from the Boltzmann Transport Equation.
Modified Beer Lambert Law
Просмотров 3 тыс.5 лет назад
How to model the diffuse reflectance from turbid tissue in a manner similar to a non-turbid medium.
Absorption and scattering coefficient
Просмотров 4,9 тыс.5 лет назад
Absorption and scattering coefficient
Quarter wave plates and elliptical states
Просмотров 3,7 тыс.7 лет назад
Quarter wave plates and elliptical states
Overview of electric dipole radiation
Просмотров 10 тыс.7 лет назад
Overview of electric dipole radiation
Electric Field, Irradiance, and Interference
Просмотров 1,3 тыс.7 лет назад
Electric Field, Irradiance, and Interference
Hi! There is unimportant question, which why the intergal of a surface should be a closed region(represented as a small circle in intergal symbol), but the integral of divergence does not need to be a closed region?
fantastic lectures!!! Is there any place I can take part in the whole lecture?
For the last formula, it should be (1-cosθ) instead of (1+cosθ)
Dear Andrew, very nice explanation! I am also doing simulations of the Modified Beer- Lambert Law, Could you please share how do you set up the simulation? Much appreciated!
Thank you so much!
where is tutorial third
I cannot thank you more, for the words that wave number and difference in path lengths form a Fourier pair !. However some books mention as 2pi/lambda as wave number, in that case lambda/2pi and x forms the pair. Does it make any difference in interpretation of result?
26:09
26:14
25:13
solid vid. i get what ur saying with the delta time axis for the interference signal plot but you define the time difference as the difference in mirror placement which is a distance. id be mindful of how you define and explain ur quantities. had to rewatch 5:20ish a few times.
Because Andrew doesn't have a follow-up video and didn't explain the DARK and BRIGHT spots, I will do it: a. The polarizer makes the incoming unpolarized light oscillate in only one direction, that is it creates polarized light. This means that the electrons in the container also oscillate in only one direction (like the electrons in a dipole antenna). Because of this there is only light emitted in directions that have a perpendicular component to the direction of oscillation. This means that we will see a DARK spot parallel (or at 0 degrees) to the direction of oscillation, and maximum BRIGHTness at 90 degrees; b. The incoming light is scattered in all directions, so there isn't much light-intensity in any direction. You can put the polarizers anywhere you want and it stays DARK; the more so because the ligth is polarized.
Thanks a lot!
I found this highly interesting. What are you principal sources?
boradbnad case also use the moving mirror? then how you access the signal?
Anyone know where I can find the WSS high school production in 1996 at LV Berkner High School in Richardson, Texas? Thanks in advance!
Great video, where did you learn this from?
Thanks for video. Could you please suggest what happens if elliptically polarised light goes through a quarter wave plate? What output state we get then?
Are there any references (book or article) to cite for this method of finding the refraction beam direction of the e-ray? The method presented is understandable, but I haven't ran across this method in the literature before. Thank you for posting the tutorial.
THANK YOU!!!!
How is the function of the distribution of photons in the simulation?
I have a question. For circular incidence, what does the output linear polarization angle look like if the fast axis of the QWP is 45 degrees to the x-axis?
Thanks for the great explanation!
Thank you for this wonderful lecture
Excellent lecture. Is the two wavelength source also referred to as a two photon interferometer?
No
Thank you very much
Well done, it now is obvious why the "C" means Coherence rather than Computed. The remaining part: How is the image location determined? Perhaps it's the 2D image on the detector wherein each pixel represents an X,Y location on the retina. YES/NO?
in fact. it is radiation heat transfer equation.
Really it is Best presentation on OCT Theory till today seen by me, Thanks a lot!!!!!
Thanks for your explanation .
What software you use
Finally, the answer I was looking for! Excellent, thank you very much for this explination.
Hi this video is very helpful! One question: when it mentions a book, what is the book title? I am really interested in reading it. Thank you in advance!
I guess he is using "Quantitative Biomedical Optics (theory, methods, and applications)" by Irving J. Bigio.
Thank you so much. What a wonderful explanation. I am pursuing my Ph.D. in engineering, but I badly needed to understand the concept of Boltzmann transport equation to proceed with my research. Your session has really helped me.
Dr. Berger, which textbook do you use for this course?
this was incredibly helpful
Very helpful explanation. Thank you so much for making this video!
very helpful
Thanks sir❤️❤️
Awful static. Excellent explanation.
You saved me! Thank you so much!
What book are u using for this video?
Hello. Thank you very much for the lessons. They are very helpful for me. I have a question. I read that the Jones matrix of a quarter-waveplate with a rotation angle a is: [ 1/sqrt(2)] * [ 1-jcosa - jsina ] [ -jsina 1+jcosa] Can you explain why please?Thanks again :)
best explanation of OCT in RUclips.
Although I don’t understand this at all really, I believe that with birefringence and liquid crystals you can shapeshift [edit] or create a holographic field around someone. Would you agree? [edit] Also maybe circular diochrism as well? 😄 I tried huh.
A very nice explanation.
You made the concept so clear! Thank you 😊
Very Informative
Sir nice video
it is a very very good explanation, Than you very much