Optical location deals with issues of particular practical importance, one of them is the task of reduction of observability of objects in optical span of wavelengths. This problem has an application in the military science, as well as in many other branches [ 11. One of the ways of reducing efficiency of using locators with laser sounding of targets is the utilization of the diffraction-reflective coverings. The main point of using them is the redistribution of the energy of the scattered radiation in space, that is transfer from uniform dispersion, described in Lambert's law, to appreciably non-uniform dispensing, which is typical for light-reflection on gitter. It is obvious that in this case we are able to gain either considerable reduction of the capacity of the signal, reflected from the target, which leads to diminution of the distance of object detection, or considerable augmentation, which means appreciable overload of the receiving apparatus, its temporary dazzle, which may cause a breakdown in the operating mode of the system.The dispensing of the intensity when the light is reflected from DRC represents a gitter and is expressed by the formula [ 2 ] : 1 = Io/N2.sin2u/u2.sin2(N.v)/sin2v, where 10 -the incident intensity; N -the number of dashes of a gitter. Here u=n.a.(siny+sincp)/h, where athe breadth of the effective facet of a dash; h -the wavelength; cp -the diffraction angle; y i -the light angle; and v=n.d.(sinW+sincp)/h, where d -the constant of a gitter.The analysis of this proportion shows that when the parameters are selected appropriately, a gitter allows to form downward excursions in the diagram of scattered radiation directivity up to zero datum and to "withdraw" the principal maximum, which may be the only one by far from the direction of probing radiation. This situation is the most advantageous from the point of view of reducing observability, as in overwhelming majority of the cases of using the systems of detection, the direction of laser sounding of the target and the receiving system's location in space are rather close.For the firther investigations of the characteristics of scattered radiation when reflecting from the real diffractional coverings manufactured industrially, as well as for the analysis of the dispersion behaviour on the objects with the complicated shape of the surface, a facility based on the ordinary goniophotometer using laser LG-113 working in multimode regime on the wave-length of 0,63 mkm has been created. EMP-28 was used as a photoreceiver, and the meterings at the large span of fluctuating of the intencity of the receiving signal were taken with the help of the calibrated light filters. Flat bidimensional film-type holographic array applied to the substrate of pnotographic paper was used as diffraction-reflective covering. Initially spacial dispensing at the side of DRC-less specimen was experimentally investigated. The results of the measurings are represented on fig. 1 by dependency 1 and are close to Lambert's dispensing. Then the specimen was turned to ...
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