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Theoretical approach on optical choppers for top-hat light beam distributions

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Duma V. F.

Editorial: IOP, UK, J. of Optics A: Pure and Applied Optics, 10(6), p.064008, 2008.


This study achieves a rigorous mathematical analysis of optical choppers, considered in their
general constructive solution, with n symmetrical wings. Their characteristic parameters and
functions are ascertained: the profile of the transmitted flux, the transmission coefficient, and
the significant energetic relationships that result. Both aspects that may be used in optical
systems are approached: the simplified case, of a light fascicle of small diameter in the plane of
the chopper, and the general case, of a fascicle of large diameter in the plane of the wheel. For
both, a top-hat distribution of the light beam is presumed. Different cases are taken into account
for the large diameter beam, with regard to the relationship between the angular dimensions of
the chopper (angle of the wings and angle of the windows) and those of the light beam. A
complete discussion regarding the different functions that may be obtained for the transmitted
flux is obtained. From this mathematical analysis, the designing calculus of the device is
developed, in its essential steps.

Cuvinte cheie: dispozitive optice, choppers, atenuatoare, analiza matematica, design optic // optical devices, choppers, attenuators, mathematical analysis, optical design