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望路过的各位大虾指点．跪求．谢谢，谢谢！！！ 1) Imagine you need to measure an optical properties of a surface: angular distribution of scattered radiation (for each wavelength). How you would do this, using which device. What difficulties and which accuracy do you expect. 2) Imagine you need to measure which (scattering) particles are dispersed in a solution (e.g. paint). Expected size of particles is say case A 10-500 nm, case B 5-50 um and concentration (volumetric) can be varied between say 0.5% to say 10%. How would you proceed. Which difficulties do you expect and which accuracy hope to achieve. How you can measure their spatial distribution if it is inhomegeneous. 3) Imagine you faced a fluorescent sample (solution or surface). How would you measure it? Which characteristics are pertinent to fluorescence? How they are defined? How to simulate fluorescence using it? 4) Do you have experience with CCD measuring cameras and photo diode sensors. How you estimate their strong and weak points and accuracy. What is their dynamic range. How to measure sample whose reflectance has WIDER range of brightness. 5) Imagine you need to simulate scattering by particles dispersed in a clear plastic. They have cylindrical shape and are of size, say case A < 0.1 um case B 1 to 5 um case C some 20-30 um How would you proceed. Which data you need and which difficulties and errors do you expect. 6) What are different cases when diffraction occurs in optics? What are their differences? How to simulate them. Which method of solution of diffraction problems in optics (under monochrome illumination) do you know. Which of them you operated. What are their weak and strong points. 7) Imagine we have solution of a diffraction problem for a snowflake under monochrome illumination, that is so-called phase function. How it can be (resp. can not be) used for simulation of scattering of sun light in a snow storm, e.g. to see bloom around sun disk. What inaccuracies do you expect. How to do. 8) What is light coherence. How to measure it. How it affects scattering and when. Pls list coherence characteristics of some common light sources. 9) Design of paint color. Imagine you have a palette of available pigments, say 100 of them. You need to fabricate a paint with desired optical properties (notice that its color may depend on angle of observation/illumination). Design consists in choosing which pigments among available to use, and in which proportions (concentrations). How would you proceed. Which data on pigments and target paint would you use. How the optimisation procedure can be organized. As a result (this or that way) you got formulation of the paint. Now suppose it is fabricated, applied, dried and measured. What deviation from predicted results do you expect. Why. 10) Imagine you have a rough surface (brushed metal). Which measuring method do you suggest to measure its profile. Imagine this was done, and the sample was simulated, The results however deviate from direct measurement of scattering. What the is the reason as you suspect. 11) Imagine that in a measurement you need to attenuate illumination (change its amplitude better gradually but at least granularly), Which attenuator will you use. What is its string and weak points and expected accuracy. [search]光学 咨询[/search] |
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