RU182725U1 - Test object for a control and calibration ground for optoelectronic systems - Google Patents

Abstract

The technical solution relates to photometry, and can be used in the evaluation of optoelectronic systems (OES) for remote sensing of the Earth (ERS) in open polygons. A test object for a control and calibration ground for optoelectronic systems made of flexible material of small thickness, consisting of several parts. As the material, a non-woven material made of polymer threads is selected, manufactured using the spunbond technology and known as “Agrospan”. EFFECT: increased resistance to environmental influences and constant reflection characteristics over the entire area. 2 s.p. f-ly, 4 ill.

Description

The technical solution relates to photometry, and can be used in the evaluation of optoelectronic systems (OES) for remote sensing of the Earth (ERS) in open polygons.

Various worlds (dashed, radial) and objects of a given configuration are used to determine the spatial-frequency characteristics of the OES remote sensing. The radiometric characteristics of the OES remote sensing are determined using brightness fields of a given size. The input signals of the OES remote sensing from test objects represent the radiation of external sources reflected from them (the Sun, etc.). The spectral reflection coefficients of test objects determine the spectral ranges of the input signals of the OES remote sensing.

Test objects are known and used for experimental evaluation of the quality of remote sensing systems, which are based on the use of various materials and coatings (inks), for example, in patent document CN 104677598, publication 2015, Academy of Optoelectronics, Chinese Academy of Sciences, a test object is described as a site from natural gravel; known test objects based on the use of oil paints: light with a filler of aluminum powder and dark (see patent for invention RU 2293960, publication 2007, LII named after MM Gromov). Obviously, the creation of such test objects is time-consuming and requires significant financial costs in their manufacture and to maintain operability. Such coatings are extremely susceptible to the effects of precipitation and have an uneven spectral characteristic, including in the range of optical radiation from 360 to 400 nm.

The problem of significant financial costs for the manufacture and maintenance is partially solved in the design of the test object - the photogrammetric worlds for creating test images of the earth's surface in order to assess the resolution and calibration of remote sensing equipment from patent for invention RU 2457435, publication 2012, MIIGAiK. Here they use a flat plate made of fabric or film with a picture of the radial worlds, this plate is mounted removably on an inflatable toroidal chamber made of elastic material. This test object is relatively simple to manufacture and operate. However, the problem of susceptibility to the effects of precipitation, which depends primarily on the technology of depicting worlds on a flat overlay, has not been solved. Similarly, the problem of uneven spectral characteristics has not been solved.

The proposed solution will allow to overcome interconnected technical problems: the dependence of the quality of use of the test object on the environmental impact, primarily precipitation, and the need to ensure manufacturability and manufacturing quality of the object itself. The proposed test object for the ECO testing and calibration range is characterized by simplicity and manufacturability, while simplicity and manufacturability will ensure its high performance, that is, it will allow the world to use in almost any weather conditions.

A flat-shaped test object is proposed for a control and calibration ground for optoelectronic systems made of flexible material of small (<5 mm) thickness from several parts. As the material, a non-woven material of polymer filaments is manufactured using the spunbond technology and known as “Agrospan”. Parts of white material are sewn onto the surface - lining of black material. The test object is a radial or dashed world.

The technical solution is illustrated by drawings:

FIG. 1 - cutting dark and light field of brightness;

FIG. 2 - radial of the world;

FIG. 3 - dashed world for high-resolution systems;

FIG. 4 - dashed world for highly detailed systems.

The test object for the ECO testing and calibration ground can be manufactured and applied as follows

Test objects are made by stitching parts (pieces, parts) of Agrospan textile material. One of the features of the Agrospan material is impregnation with ultraviolet (UV) stabilizers, which provide strength properties of the fabric under the influence of solar radiation, temperature changes, etc. The black material "Agrospan" has a mass of the surface layer of 60 g / m. The carbon black additive dyes the material black. Due to the presence of carbon black, the material has a low spectral reflection coefficient of 0.03 in the spectral range from 350 to 2500 nm.

A UV stabilizer is also added to the Agrospan white covering material, which creates diffused light and increases durability. The spectral reflection coefficient is about 0.3 in the spectral range from 350 to 2300 nm. The spectral reflection coefficient is proportional to the mass of the surface layer.

The test objects for the ECO test and calibration ranges are made of black material, on which white material is sewn in the specified areas, which ensures reflection of incident radiation only from white material (without a black lining, additional reflection of radiation from the surface on which the test object is located) . The quickness and quality of manufacturing a test object from affordable easily cuttable and stitched material is obvious.

The manufacture of a test object stitched from separate parts, as well as the possibility of choosing a material for joining by stitching, will provide sufficient resistance to environmental influences. As a result, the test object will possess the diffuse reflection properties of the incident radiation and constant reflection characteristics over the entire area.

The low density of the materials used allows you to create test objects of a large area (Fig. 1-4). For example, in (Fig. 1), the material of a black field of brightness of ~ 30 × 30 m in size has a mass of about 900⋅60 = 54000 g. The material of a bright field of brightness of ~ 30 × 30 m in size has a mass of about 2⋅900⋅60 = 108000 g, as white material is sewn onto black. Such weight and size characteristics allow you to create mobile deployable test objects (radial world - Fig. 2, dashed worlds - Fig. 3, 4) with high strength and resistance to external mechanical and climatic influences.

Thus, a test object is proposed for the ECO testing and calibration site, characterized by the simplicity and manufacturability, while the simplicity and manufacturability provides high performance in almost all weather conditions.

Claims (3)

1. A test object for a testing and calibration ground for optoelectronic systems made of flexible material of small thickness, characterized in that it is sewn from several parts of non-woven polymer material "Agrospan", and parts of white material are sewn onto the surface - lining of black material. 2. The test object according to claim 1, characterized in that it is a radial world. 3. The test object according to claim 1, characterized in that it is a dashed world.

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