求助，帮师妹答几个光学题目，谢谢了
2)Imagineyouneedtomeasureanopticalproperties of asurface: angulardistribution ofscattered radiation(for each
wavelength).
How you would do this, using which device. What difficultiesand
which accuracy do you expect.
3)Imagineyoufacedasituationwhencustomer'sPLED
(Plane Light Emitter )
was simulated, butthe results(spatial distributionof brightness
over screen)differs substantiallyfrom whatwas measured(by
customer). The PLEDconsists of aCCFL tube, anLGP with micro
dimplesonitsbottom,wrappedina white plastic reflector
sheet, and a couple of DBEFs (this plates with microprisms)laid
on its emitting surface. Even with DBEFs removed there remainsa
viable difference.
SpecificationsofgeometryandCCFLweregiven by customer,
optical properties of reflector sheet and DBEFs were measured.
Whatwouldyoudo.Whereyoususpecttheerror. Which its
magnitude do youconsider normal (e.g.caused by inaccuracyof
measurement, deviation of CCFL instances etc).
4) Imagine you needto measure which (scattering)particles are
dispersed in a solution (e.g. paint). Expected size ofparticles
is say
case A 10-500 nm,
case B5-50 um
and concentration (volumetric) can be varied between say 0.5%to
say 10%. How would you proceed. Which difficulties do youexpect
and which accuracy hope to achieve.
Howyoucanmeasuretheirspatialdistributionifit is
inhomegeneous.
5) Imagine you faced a fluorescent sample (solution orsurface).
How would you measure it? Which characteristics are pertinentto
fluorescence? How they are defined? How to simulatefluorescence
using it?
6) Imaginea customerdevice (plsgive SSMLscene). Theysay
there is emitterthat is <1/100 (!!) wavelengthin size. What
can such emitter be. How you can simulate it.
7) Do youhave experience withCCD measuring camerasand photo
diode sensors. How you estimate their strong and weak pointsand
accuracy.Whatistheirdynamicrange. How to measure sample
whose reflectance has WIDER range of brightness.
8) 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.
9) What aredifferent cases whendiffraction occurs inoptics?
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.
10)Imaginewehavesolutionofa diffraction problem for a
snowflake under monochrome illumination, that is so-calledphase
function.
Howitcanbe(resp.cannotbe)usedforsimulation 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.
11) What islight coherence. Howto measure it.How it affects
scattering andwhen. Plslist coherencecharacteristics of some
common light sources.
12) Imagine you havea PLED (see pt3). Dimples on LGPsurface
have spatially varied density, orientation, size and maybe shape.
These parameters,or rathertheir spacedistribution, mustbe
chosen(designed)soastoachievee.g.maximallyuniform
brightness of emitted light. Experience shows that e..g. size may
vary about order of magnitude from one edge to another, andwith
a properprofile onemay achievenearly (+/-a few percent or
less) brightness.
The work consists of two coupled phases: ANALYSIS (calculation of
characteristics of emission for GIVENdistributions)and
OPTIMISATIONSTEP(changingthosedistributionsby comparing
obtained and target emissions).
How you would do such a design. What simulation andoptimisation
method would you use. Which difficulties do you expect.
What are your estimates of required run time and memory.
13)Designofpaintcolor.Imagineyouhaveapalette of
available pigments,say 100of them.You needto fabricatea
paint with desired optical properties (notice that its colormay
depend on angle of observation/illumination).
Design consistsin choosingwhich pigmentsamong availableto
use, and in which proportions (concentrations).
How would youproceed. Which dataon pigments andtarget paint
would you use. How the optimisation procedure can be organized.
As a result (this or that way) you got formulation of thepaint.
Now suppose it isfabricated, applied, dried andmeasured. What
deviation from predicted results do you expect. Why.
14)Imagineyouhavearoughsurface (brushed metal). Which
measuring method do you suggest to measure its profile.
Imagine this was done, and the sample was simulated, Theresults
however deviate from direct measurement of scattering. Whatthe
is the reason as you suspect.
15)Imaginethatinameasurementyouneedto attenuate
illumination (change its amplitude better gradually but atleast
granularly),Which attenuator will you use. What isitsstring
and weak points and expected accuracy. 刚刚看到你的消息了，但是很抱歉，这些问题不是我的专长，没有办法回答你，如果是激光相关的还可以，应用光学这块我也在学习，看看其他人的回答吧
[ 本帖最后由 shaka2007 于 2007-9-14 17:04 编辑 ]
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