Amateur Photographer [UK] (27 September 2014)

Novice Photographer is the world’s oldest weekly journal for images lovers. With its particular weekly layout, it's the first for information and electronic and picture apparatus assessments. commonplace beneficial properties on reader portfolios, darkroom, electronic, black & white and photographer profiles ascertain all parts of images are lined.

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Amateur Photographer [UK] (27 September 2014)

Novice Photographer is the world’s oldest weekly journal for images fans. With its specified weekly layout, it's the first for information and electronic and picture apparatus assessments. commonplace beneficial properties on reader portfolios, darkroom, electronic, black & white and photographer profiles verify all components of images are lined.

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By Blinkov et al. [54J to provide simultaneous multiangular test section illumination in multidirectional speckle photography for tomographic reconstruction of a 3D ftow field. A ruby laser can be supplied with amplifiers. 1-1 J of coherent energy, whereas with amplifiers this energy could be increased to 5-10 J. 3 There is another available high-power pulsed laser in the visible region of the spectrum - a neodim (Nd:YAG) laser. m. m green light. 5 J with a time duration of the laser pulse of 5-6 ns.

4. ArTe For a paraboloidal surface correlation function this expression has form rc 2 7rrc 2 . 2 < 1((}) >= cos(}· 7r( ~) . exp{ -( ~) . 12) ArTe ArTe Analysis of these equations shows that the on-axis intensity of the conical diffuser is twice as great as that of the paraboloidal one for the same value of the appropriate shape parameter. 12). However, to fit the radiation pattern behind the etched glass over aU angles, it is necessary to use a composite diffuser model containing two scales of roughness [40].

For the particular case of a uniform and square scattering spot, the power spectral density is of the form [22] W(fx, fy) =< 1 >2 [8(fx,Jy) + (~) 2. 39) where L = 2a = 2b and A(x) = 1 - Ixl for Ixl :::; 1, zero otherwise. As we can see, the speckle pattern contains no frequency components higher than f:z, cycles/m both in the fx and in the fy components. Let us now go to the analysis of autocorrelation functions for the case involving imaging systems. This case is also illustrated in Fig. 2. We suppose that the object of concern is uniformly reflective and the illuminated region is broad as compared with the resolution cell associated with the lens used.

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