SU512412A1 - Shadow device - Google Patents

Description

the diaphragm is not broken if the distances between the lines are different.

FIG. 2 gives a photographic scheme of ontic inhomogeneities in a shadow instrument, using a diffraction grating with many faults as the defocused aperture. The light from laser 1 is formed by lens 2 into a collimated note, which shines through the object under study 3. Lens 4 dried out, direct fourier transform is introduced. The diffraction grating 5, which contains a system of fold lines, performs the function of a defocused diaphragm and is located outside the plane of spatial frequencies. Lens 6 provides the inverse Fourier transform. The image is obtained on screen 7.

The camera is installed in the direction of the first order of diffraction of coherent monochromatic light on a diffraction grating with a system of lines of failure of the angle to the optical axis of the system. The dark lines resulting only from the process of ltifraction of light have a high contrast and a rather large width.

Claims (1)

Invention Formula Shadow device for observing optical irregularities using the defocused diaphragm method, containing a source of monochromatic light, a direct and reverse Fourier transducer lens, out of focus aperture and an observation screen, characterized in that, in order to eliminate the absorption of light in the defocused aperture and to maintain a high contrast of the image of the stripes, the defocused aperture is made in the form of a diffraction grating containing a system of lines of failure, so that every n lines where n 1 and may be different in each group, the distance between adjacent strokes is two times smaller than in regular areas of the diffraction grating, and the inverse Fourier transform lens and the observation screen are located in the direction and first-order diffraction. Phi.1 ifJUZ.2