SU1283685A1 - Grating-polarizer - Google Patents

Abstract

The invention relates to technical physics and can be used in the design of spectral instruments. The purpose of the invention is to improve the accuracy and performance of measurements by preventing the registration of spectral bands that do not belong to the object under study. The grating is an optically thin layer 1, transparent in a given spectral region and formed by two surfaces 2 and 3. Surface 3 is made in the form of a system of periodic strokes of a triangular profile, on a part of one of whose faces are metal reflective strips 4, oriented strokes. Making surface 2 smooth in the form of a sphere with a certain radius helps to reduce the intensity of the interference spectra. 4 il. a (L with:

Description

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The invention approaches technical physics and can be used in the design of spectral instruments such as spectrophotometers.

The purpose of the invention is to improve the accuracy and performance of spectrophotometric measurements by preventing the recording of spectral bands that do not belong to the object under study.

FIG. Figure 1 shows the proposed polarizer lattice made in the form of an optical thin layer of a variable crowd of dncpj. of figs. 2 is a diagram of a method for manufacturing a polarizer-grid} in FIG. 3 shows a device for implementing the method in FIG. 4, the spectra of omission of the known and proposed polarizer arrays in the transparency region of the optical layer.

The polarization grating is made in the form of an optical thin layer 1 transparent in a given spectral region and has a ratio of thickness d (mm

spectral-25 layer and spectral resolution of operation by imparting, for example, a lens (cm) smooth surface to a concave shape

ssfera.

d4 hAV,

where n is the refractive index of the optical layer 1,

Layer 1 is formed by two surfaces, one of which (2) is smooth, and the other (G) is made in the form of a system of periodic strokes of a triangular profile 5 on a part of one of the faces of which a metallic reflective coating 4 is applied, forming thin parallel strips oriented in the direction of strokes .

At the same time, the smooth surface.2 of the polarizer lattice is made in the shape of a sphere, the radius of curvature R of which satisfies the relation

.§ /: R P -

- t 5 and, J,

° Ha “S where a is the light size of the grille — the field of the rizer;

d is the greatest thickness of the optical layer.

The grid-polarizer works as follows.

When electromagnetic radiation with an electric vector is incident on a polarizer grating, parallel to metal elements 4, in the latter strong currents are induced, creating a reflected field almost like

0.2

same as the box from a solid metal surface. When the electric vector is perpendicular to the metallic elements 4, the falling

the wave tends to excite the currents flowing across the elements, however, due to the small transverse size, the induced currents and the field created by them will be small and the wave passes unhindered through the grid polarizer.

Making the surface 2 spherical with radius R prevents the registration of interference spectra due to a decrease in their intensity due to the introduction of a variable thickness of the optical layer in the direction of the cross section of the polarizer grating. In this case, the found form

a smooth surface makes it possible to manufacture it simultaneously with the manufacture of the thinnest layer while maintaining its mechanical strength sufficient for the conditions

The method of manufacturing the polarizer lattice is carried out by removing the transparent copy from the matrix lattice containing the three-dimensional profile, and applying a metallic coating to the copy at an oblique angle to its surface. At the same time, a thin liquid or plastic is applied to the surface of the diffraction grating-matrix 5 (Fig. 2), for example, thermoplastic, layer 6 with thickness .O, mm and thickness 40

tant optical presser. plate 7 in the holder 8, which provides a predetermined spatial position of the surface of the optical pressure plate 7, geometrically complementary to the smooth surface of the 2.formed layer, relative to the surface of the array lattice 5; thickness (filled with a liquid or plastic layer 6. Next, the phase transition of the substance of the layer 6 into the solid state is carried out, for example, by polymerization of the liquid layer, after which edovatelno separated sformirovannm optical layer on the lattice-matrix 5 and the optical presser plate 7,

FIG. g

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Claims (1)

Invention Formula The polarization lattice is filled in the form of an optical layer, transparent in a given spectral region, of thickness d, satisfying the relation d g ---- - niN mm o five 0 five 0 where n is the refractive index of the optical layer; ui), - spectral separation of the spectrophotometer, cm, formed by two surfaces, one of which is made smooth, and the other - as a system of periodic strokes of a triangular profile, on one part of which faces a metallic reflective coating is applied, forming parallel strips oriented in the direction of the strokes, which differs from the fact that, in order to increase the accuracy and performance of spectrophotometric measurements by preventing the registration of spectral bands not belonging to the volume under study ectu, smooth, the surface of the lattice-polarizer is made in the form of a sphere, the radius of curvature In which satisfies the relation  2i 0,2 -s --- R $ 0,3 -,  naia aib where a is the light size of the lattice-by, l rizator; d is the greatest thickness of the optical layer,. . FIG. g Fiz. SO / o & 0% Compiled by V. Kravchenko Editor M. Bandura Tehred V. Kadar Order 7435/44. Circulation 522Subscribe VNIIPI USSR State Committee inventions and discoveries 113035, Moscow,, Raushsk nab ,, d, 4/5 Production and printing company, Uzhgorod, st. Project, 4  v Proofreader S. Shekmar