Traditional methods used in optics teaching lack clarity and vividness when illustrating abstract notions such as polarization or interference. Here's where computer models may help, but they usually show only a single phenomenon or process and don't let the student see the entire picture. For this reason at Moscow Institute of Physics and Technology was developed the courseware "Wave Optics on the Computer' consisting of a number of related simulations. It is intended for students studying optics at the Universities. Recently we have developed different simulations in optics for secondary school level. They are included as part oflarge computer courseware "PHYSICS by PICTURES". The courseware "Wave Optics on the Computer" consists of nine large simulation programs and the textbook. The programs are simulating basic phenomena of wave optics. Parameters of optical systems can be varied by the user. The textbook contains theoretical considerations on studied optical phenomena, recommendations concerning work with computer programs, and, especially for those wishing to deeper understand wave optics, original problems for individual solution. At the Moscow Institute of Physics and Technology the course "Wave Optics on the Computer" is used for teaching optics in the course of general physics. The course provides both computer assisted teaching for lectures support and computer assisted learning for students during a seminars in the computer classroom.

An optical method is suggested for nondestructive measurement of a velocity distribution in a flow of light scattering particles. Photocurrent spectrum of a point photodetector is found to reproduce a velocity distribution function of scattering particles. 1.DESCRIPTION OF METHODNow optical methods are widly used for nondestructive testing of flows of scattering particles. We would like to offer the new simple method of measurement of a velocity distribution in a light scattering flow.Let us consider one dimentional flow of scattering particles moving in the direction of axis in the plane z=O. Light field in this plane is formed by a plane monochromatic wave with wave vector directed along axis z,i.e. along the normal to the plane where scattering particles move.Complex amplitude of the light field in the plane z=O is g0() =1. Small photodetector is situated at the point x of observation plane z=const>O. Scattering particles, all of the same size a, are randomly placed along axis .Let be coordinate of n-th particle at moment 1=0. Then particle coordinate versus time iswhere v, is the particle velocity. Transperency function of a single particle can be written as m(4,t) = 1 -a(' vt) , (1) where Pa() = 1 if I I ' Pa(') = 0 if I I > . Let us consider the particles flow as a randomly changed screen. Then its transparency function is m(,t) = ---vat)Wave complex amplitude on the output plane z=O is g(,t)= g0() m(x,O.The observation plane is distanced to the far diffraction zone with respect to the scatterer size a: a2(3)We find the complex amplitude at point x of the observation plane (the far diffraction zone approximation of Kirhgoff integral ):.kx2 exp(z----)) 0-81 94-1399-2/93/$6.0O SPJE Vol. 2108 / 303 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/17/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

Scattering probe method for diagnostics of coherent light field is suggested. The method allows to transform spatial distribution of amplitude and phase of light field into the time-modulated responce of a point photodetector.

No abstract

No abstract