阅读说明：本技术 基于微管吸收技术的大面源红外遥感辐射定标靶标 (Large-area source infrared remote sensing radiometric calibration target based on micro-tube absorption technology ) 是由 李传荣 钱永刚 邱实 高同 钱晓波 马灵玲 王宁 李坤 刘耀开 陈志明 唐伶俐 于 2018-09-06 设计创作，主要内容包括：本发明提供一种基于微管吸收技术的大面源红外遥感辐射定标靶标,该定标靶标包括温控箱体和微管阵列吸收组件,温控箱体包括侧壁和连接至侧壁的底壁,微管阵列吸收组件在温控箱体内设置于侧壁和底壁上,微管阵列吸收组件为蜂窝状结构,在蜂窝状结构的内壁表面上涂覆漫反射涂层。本发明通过腔体吸收与表面吸收漫射理论相结合,并通过设置温控箱体,保证定标靶标腔体温度的稳定性、均匀性和可控性。(The invention provides a large-area-source infrared remote sensing radiation calibration target based on a micro-tube absorption technology, which comprises a temperature control box body and a micro-tube array absorption assembly, wherein the temperature control box body comprises a side wall and a bottom wall connected to the side wall, the micro-tube array absorption assembly is arranged on the side wall and the bottom wall in the temperature control box body, the micro-tube array absorption assembly is of a honeycomb structure, and a diffuse reflection coating is coated on the surface of the inner wall of the honeycomb structure. According to the invention, the cavity absorption and surface absorption diffusion theories are combined, and the stability, uniformity and controllability of the temperature of the calibration target cavity are ensured by arranging the temperature control box body.)

1. A large area source infrared remote sensing radiometric calibration target based on a microtubule absorption technology is characterized by comprising the following components:

the temperature control box body comprises a side wall and a bottom wall connected to the side wall; and

the micro-tube array absorption assembly is arranged on the side wall and the bottom wall in the temperature control box body, the micro-tube array absorption assembly is of a honeycomb structure, and a diffuse reflection coating is coated on the surface of the inner wall of the honeycomb structure.

2. The large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology as claimed in claim 1, wherein the side wall and the bottom wall of the temperature control box body respectively comprise a protective layer, a heat preservation layer, a heating layer and the microtube array absorption assembly in sequence from outside to inside.

3. The large area source infrared remote sensing radiometric calibration target based on the micro tube absorption technology as claimed in claim 2, wherein an electric heating tube is disposed in the heating layer, and the side wall and the bottom wall are heated by the electric heating tube.

4. The large area source infrared remote sensing radiometric targeting target based on the microtube absorption technique as claimed in claim 3, wherein said heating layer comprises a cast aluminum layer.

5. The large area source infrared remote sensing radiometric calibration target based on the microtubule absorption technique as claimed in claim 1, wherein the microtubule array absorption assembly comprises a microtubule cavity array, which is a regular hexagonal structure.

6. The large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology as claimed in claim 1, wherein the diffuse reflection coating is black.

7. The large area source infrared remote sensing radiometric calibration target based on the microtube absorption technique as claimed in claim 1, wherein said calibration target further comprises an aperture stop at its exit for limiting the exit effective area of said calibration target.

8. The large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology as claimed in claim 1, wherein the temperature controlled box body comprises two guard doors oppositely disposed on the side wall.

9. The large area source infrared remote sensing radiometric targeting target based on the microtube absorption technique of claim 8, wherein the guard doors are provided as part of the side walls, each of the guard doors being connected to the side walls by hinges.

10. The large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology as claimed in claim 9, wherein the protection door is provided with a switch device, the switch device comprises a stud and a disc crank.

11. The large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology as claimed in claim 1, wherein the temperature control box further comprises a temperature control system, the temperature control system comprises a temperature control probe and a temperature measurement probe, the temperature control probe is arranged in the heating layer, and the temperature measurement probe is arranged in the microtube array absorption assembly.

12. The large area source infrared remote sensing radiometric calibration target based on the microtube absorption technique as claimed in claim 11, wherein each sidewall is equally divided into two temperature control areas, an upper temperature control area and a lower temperature control area, and the bottom wall is equally divided into four temperature control areas, and the temperature control system employs a separate controller for each temperature control area.

13. The large area source infrared remote sensing radiometric calibration target based on the microtube absorption technique as claimed in claim 1, wherein said temperature control system further comprises a data display and collection device disposed on one of said side walls.

14. The large area source infrared remote sensing radiation calibration target based on the microtube absorption technology as claimed in claim 1, wherein the calibration target further comprises a base, the temperature control box body is arranged on the base, and the base can move; the base includes a plurality of supporting legs that are used for supporting the control by temperature change box.

Technical Field

The invention relates to the field of calibration, in particular to a calibration target for infrared remote sensing.

Background

The earth surface information is obtained by a satellite remote sensing technology, and the method is the only method for rapidly obtaining earth surface information in a large range and even a global scale at present. The accurate and reliable quantitative remote sensing information product is provided in a business operation mode, and is a necessary trend for the development of the international earth observation field. The accuracy of remote sensing information extraction is critically dependent on the accuracy of load calibration and the stability and reliability of data quality, and in the process of remote sensing load operation, when the environment changes or the instrument ages, the radiation performance of the remote sensing load changes, so that the remote sensing load is subjected to outfield substitution calibration, the dynamic performance change in the remote sensing load operation process is effectively monitored, the change degree is accurately detected, the change reason is accurately found, and a targeted remedial measure is formulated, so that the accuracy key for guaranteeing the quality of remote sensing load data acquisition becomes the key.

At present, a high-precision black body radiation source is generally adopted for calibration of a thermal infrared remote sensing load laboratory, calibration is carried out by adjusting the temperature of a black body, but the aperture of the calibration black body in the laboratory is generally within 50cm, and the external field calibration requirement is difficult to meet. The thermal infrared remote sensing load outfield substitution calibration mainly utilizes a large-area water body with emissivity close to 1 to carry out outfield radiometric calibration at present. Although the difference of the surface temperature change of the water body is small, the water body can only be used as a low-temperature radiation source, the response change in the temperature dynamic range is difficult to accurately describe, and the on-orbit calibration of the load with high adaptability is difficult to realize.

Disclosure of Invention

In order to overcome at least one aspect of the above problems, embodiments of the present invention provide a high-emissivity large-area source radiometric calibration target based on a micro-tube absorption cavity technology, which combines cavity absorption with a surface absorption/diffusion theory, and uses a large-sized box-type semi-closed temperature control box with a built-in zoned stainless steel electrical heating tube to ensure the stability, uniformity and controllability of the temperature of the cavity of the target.

According to one aspect of the invention, a large area source infrared remote sensing radiation calibration target based on a micro tube absorption technology is provided, and the calibration target comprises: a temperature controlled cabinet comprising a side wall and a bottom wall connected to the side wall; and the micro-tube array absorption assembly is arranged on the side wall and the bottom wall in the temperature control box body, the micro-tube array absorption assembly is of a honeycomb structure, and the surface of the inner wall of the honeycomb structure is coated with a diffuse reflection coating.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technology, the side wall and the bottom wall of the temperature control box body respectively comprise a protective layer, an insulating layer, a heating layer and a micro-tube array absorption assembly from outside to inside in sequence.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technology, the heating layer is provided with an electric heating pipe, and the side wall and the bottom wall are heated through the electric heating pipe.

According to some embodiments of the present invention of a large area source infrared remote sensing radiometric calibration target based on the micropipe absorption technique, the heating layer comprises a cast aluminum layer.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology, the microtube array absorption assembly comprises a microtube cavity array, and the microtube cavity array is in a regular hexagon structure.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology of the present invention, the diffuse reflection coating is black.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the microtube absorption technique of the present invention, the calibration target further comprises an aperture stop at the exit thereof for limiting the exit effective area of the calibration target.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology, the temperature control box body comprises two protective doors oppositely arranged on the side wall.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the micropipe absorption technique of the present invention, guard doors are provided as part of the side walls, each guard door being connected to the side walls by hinges.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the micropipe absorption technology, the protective door is provided with a switch device, and the switch device comprises a stud and a disc crank.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technology, the temperature control box body further comprises a temperature control system, the temperature control system comprises a temperature control probe and a temperature measurement probe, the temperature control probe is arranged in the heating layer, and the temperature measurement probe is arranged in the micro-tube array absorption assembly.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the micropipe absorption technology, each side wall is divided into an upper temperature control area and a lower temperature control area, the bottom wall is divided into four temperature control areas, and the temperature control system controls each temperature control area by adopting an independent controller.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology of the present invention, the temperature control system further comprises a data display and acquisition device disposed on one of the sidewalls.

According to some embodiments of the large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technology, the calibration target further comprises a base, the temperature control box body is arranged on the base, and the base can move; the base includes a plurality of supporting legs that are used for supporting the control by temperature change box.

Compared with the prior art, the invention has at least one of the following advantages:

(1) the temperature of the target can be adjusted, controlled and automatically collected;

(2) the target radiation surface is far larger than a black body for laboratory use;

(3) the target has high emissivity and uniformity.

Drawings

Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.

FIG. 1 is a schematic perspective view of a large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technique according to an embodiment of the present invention;

FIG. 2 is a schematic longitudinal cut-away view of the side wall or the bottom wall of a large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technology according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of a microtube array absorption assembly of a large area source infrared remote sensing radiometric calibration target based on microtube absorption technology according to an embodiment of the present invention;

FIG. 4 is a side view from the side of a guard gate of a large area source infrared remote sensing radiometric calibration target based on micropipe absorption techniques according to an embodiment of the present invention;

FIG. 5 is a schematic position diagram of a temperature probe and a temperature control probe of a large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technique according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a base of a large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technique according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.

The embodiment of the invention provides a large-area-source infrared remote sensing radiation high-emissivity large-area-source radiometric calibration target based on a micro-tube absorption technology, which combines cavity absorption and a surface absorption/diffusion theory and adopts a large box-type semi-closed temperature control box with a built-in partition stainless steel electric heating tube to ensure the stability, uniformity and controllability of the temperature of a cavity of the target.

The embodiments of the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of a large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technology according to an embodiment of the present invention. As shown in fig. 1, a large area source infrared remote sensing radiometric calibration target 100 based on a micro-tube absorption technology includes a temperature control box 1 and a micro-tube array absorption assembly 4 disposed in the temperature control box 1, where the temperature control box 1 includes a side wall 2 and a bottom wall 3 connected to the side wall 2. The microtubule array absorbing assembly 4 is arranged on the side wall 2 and the bottom wall 3 in the temperature control box body 1, the microtubule array absorbing assembly 4 is of a honeycomb structure, and the inner wall surface of the honeycomb structure is coated with a diffuse reflection coating. According to a preferred embodiment, the diffuse reflective coating is black.

As can be seen from the figure, the temperature-controlled box body 1 of the present embodiment includes four side walls 2 and a bottom wall 3, and the upper side is open, that is, the temperature-controlled box body 1 is in a semi-closed state. In other embodiments, the temperature control box 1 of the large-area-source infrared remote sensing radiometric calibration target 100 based on the micropipe absorption technology according to the present invention may also have other shapes, such as a cylinder, a cube, a regular polyhedron, etc.

FIG. 2 is a longitudinal sectional view of a large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technique according to an embodiment of the present invention; as shown in fig. 2, the side wall 2 and the bottom wall 3 of the temperature control box body 1 respectively comprise a protective layer 21, an insulating layer 22, a heating layer 23 and a micro-tube array absorption assembly 4 from outside to inside. The protective layer 21 is used for preventing an external object from colliding with the temperature control box body, protecting components in the box body from being damaged, and reducing radiation of internal substances to the outside; the heat-insulating layer 22 is used for slowing down the heat loss; the heating layer 23 is used to heat the entire tank. For example, an electric heating tube may be provided in the heating layer 23, by which the side wall 2 and the bottom wall 3 are heated.

According to a preferred embodiment, the heating layer 23 comprises a cast aluminum layer. An electric heating pipe and a thermocouple can be arranged in the cast aluminum layer, so that a better heating effect is realized.

The micro-tube array absorption component 4 comprises a micro-tube cavity array 41, and the micro-tube cavity array 41 is in a regular hexagon structure. Fig. 3 is a schematic perspective structure diagram of a microtube array absorption assembly 4 of a large area source infrared remote sensing radiometric calibration target based on the microtube absorption technology according to an embodiment of the present invention. In this embodiment, in order to solve the technical problems of difficult manufacturing process of the large-area black body and guarantee emissivity and uniformity, the cavity absorption theory and the surface absorption/diffusion theory are combined, the micro-tube cavity array 41 is used as a basic working unit, the surface of the cavity is coated with a low-reflection diffusion extinction material, the absorption and diffusion characteristics are enhanced, and the emissivity and uniformity of the black body are guaranteed. Meanwhile, the plurality of micro-tube cavity arrays 41 arranged on the side wall 2 and the bottom wall 3 form a semi-closed composite cavity, so that the influence of the environment on the target emissivity and uniformity is further inhibited. The micro-tube array absorption assembly 4 is composed of large-area honeycomb aluminum with a continuously arranged regular hexagonal three-dimensional structure, and the cross section of each micro-tube is in a regular hexagon shape. In this embodiment, the inscribed circle radius R of the regular hexagon may be 3mm, the tube length L may be 25mm, and the tube wall thickness may be 0.06mm, although in other embodiments, the size of the regular hexagon may be different, or microtubes with other cross-sectional shapes, such as triangle, quadrangle, and other regular polygon, may also be adopted. The surface of the micro-tube array absorption assembly 4 is subjected to oxidation blackening treatment and is sprayed with a black diffusion coating. Rivets may be used to secure the microtube array absorber assembly 4 to the side walls 2 and bottom wall 3 of the interior of the cavity, although other means of securing may be used as will occur to those of skill in the art.

The cavity emissivity can be calculated by: assuming that the reflectivity in the cavity is rho c, the reflectivity of the cavity wall is rho 0, the inner diameter of the cavity is R and the depth of the cavity is L, the emissivity in the cavity is epsilon according to the cavity absorption theory and kirchhoff's law:

ε＝1-ρc＝1-ρ0/[(1-ρ0)·(1+(L/R)²)]

if ρ 0 is 0.1 and L/R is 8.5, the target theoretical emissivity e is greater than 0.99. Thus, when the micro-tube array absorption assembly 4 is surface coated with a black diffuse coating having an emissivity greater than 0.9, the cavity emissivity will be greater than 0.99. In the embodiment, the extinction coating material Pyromark1200 with high emissivity and low diffuse reflection is adopted, the emissivity is higher than 0.9 in the spectrum range of 8-14 microns, and the extinction coating material Pyromark has the characteristics of preventing the metal surface from rusting for a long time, resisting oxidation and resisting corrosion. The micro-tube array absorption assembly 4 and the black diffusion coating ensure good lambertian and uniformity of the black body source in terms of both structural extinction and surface extinction.

The calibration target further comprises an aperture stop at the exit of the calibration target for limiting the effective area of the exit of the calibration target. In the embodiment, the aperture diaphragm is positioned at the exit port above the target cavity, the size of the aperture diaphragm can be customized, the aperture diaphragm is used for limiting the effective area of the target exit, and the emissivity and the temperature uniformity of the target cavity can be guaranteed to the maximum extent.

The temperature control box body 1 comprises two protective doors 5 oppositely arranged on the side wall 2, and of course, 1 protective door can also be arranged.

Fig. 4 is an external schematic view of a guard gate 5 of a large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technology according to an embodiment of the present invention. As shown in fig. 4, the guard door 5 includes a frame 51, a hinge 52, and an opening and closing device 53. Guard doors 5 are provided as part of the side walls 2, each guard door 5 being connected to a side wall 2 by a hinge 52. The protective door 5 is provided with a switch device 53, the switch device 53 comprises a stud and a disc crank, and the stud can be combined with or separated from the relevant part on the side wall 2 by rotating the disc crank, so that the protective door 5 is in sealing fit with or separated from the side wall 2. In this embodiment, there are two guard doors 5 in front and back, namely set up guard door 5 respectively on relative lateral wall 2, every guard door 5 is fixed by three high strength hinge 52, is equipped with two double-screw bolts and disc crank and realizes the switch of guard door 5. Before the protective door 5 is opened or closed, the bottom support of the targeting target needs to be adjusted to be in a horizontal state as a whole, and then the disc crank is rotated to be opened or closed. The protective doors 5 are positioned on two sides of the temperature control box body, so that the target is convenient to maintain.

FIG. 5 is a schematic position diagram of a temperature probe and a temperature control probe of a large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technology according to an embodiment of the present invention. The temperature control box body 1 further comprises a temperature control system, and the temperature control system comprises a temperature control probe 61 and a temperature measurement probe 62. As shown in FIG. 5, a temperature control probe 61 is provided in the heating layer 23, and a temperature probe 62 is provided in the micro tube array absorption member 4.

In this embodiment, the temperature control is realized by a large box-type temperature control device, a large box-type semi-closed cavity is adopted, and a built-in partitioned heating element is used for continuously controlling the temperature of the bottom wall 3 and the side wall 2 in cooperation with real-time temperature feedback and a PID (proportional-integral-differential controller), so as to ensure the stability, uniformity and controllability of the overall temperature. The temperature measuring probe 62 and the temperature control probe 61 both adopt pt100 thermal resistance temperature sensors, the measuring precision of the pt100 thermal resistance temperature sensors is as high as 0.1K, the temperature measuring probe is suitable for temperature measurement within the range of-200 ℃ to 500 ℃, and the temperature measuring probe is characterized by accurate measurement, good stability and reliable performance. The temperature control probe is used for monitoring the temperature of the heating layer 23 so as to control the temperature of the heating layer 23, and the temperature control probe penetrates through the heat insulation layer 22 to reach the middle position of the heating layer 23 and is in contact with the four walls of the heating layer 23. The temperature measuring probe 62 is a detection probe used by a temperature measuring instrument, and the position of the temperature measuring probe passes through the insulating layer 22 and the heating layer 23, stays in the hole of the micro-tube array absorption assembly 4, is attached to the four walls of the micro-tube array absorption assembly 4, and measures the temperature of the middle part of the micro-tube array absorption assembly 4.

In order to control the temperature of the bottom wall 3 of the temperature control box body 1 and the heating layer 23 of the side wall 2, the bottom wall 3 and the side wall 2 can be equally divided into a plurality of large areas, an electric heating pipe is arranged in the heating layer 23 for heating in a partition mode, and the temperature in the cabin is kept uniform and stable. In this embodiment, each side wall 2 is equally divided into two upper and lower temperature control regions, the bottom wall 3 is equally divided into four temperature control regions, and the temperature control system adopts an individual controller for each temperature control region.

The temperature control system further comprises a data display and acquisition device 63 arranged on one of the side walls. In this embodiment, the data display and acquisition device 63 includes a high-precision intelligent digital display temperature control instrument and a temperature recorder. The high-precision intelligent digital display temperature control instrument is mainly used for controlling the internal temperature of the heating layer 23 of the bottom wall 3 and the side wall 2 and displaying the data of the temperature control probe 61; the temperature recorder comprises a storage SD card which is mainly used for displaying and recording the measurement data of the temperature measuring probe 62 positioned inside the micro-tube array absorption assembly 4.

The calibration target also comprises a base 8, the temperature control box body is arranged on the base 8, and the base 8 can move; the base 8 includes a plurality of support legs 81 for supporting the temperature control case 1. Fig. 6 is a schematic diagram of a base 8 of a large area source infrared remote sensing radiometric calibration target based on the micro-tube absorption technique according to an embodiment of the present invention. In the practical application, because the target weight is up to several tons, be convenient for the target removes the use, can set up base 8, place the target on base 8, can adopt trailer or many people manual mode to realize that the target removes. The base 8 has the functions of front suspension rotary support steering and rear suspension orientation. The base 8 is equipped with many hand formula supporting legs 81, can be 4 for example, and supporting leg 81 contracts at ordinary times on base 8, can prop up supporting leg 81 through artifical the rocking to be used for the long-term placing of target when quiescent condition. In other embodiments, the support legs 81 can be remotely supported by infrared rays or the like.

The invention can realize the automatic temperature acquisition and temperature control of the calibration target under the condition of the external field test, and solves the problem that the external field of the traditional thermal infrared load replaces the calibration and only has a low-temperature end point; the invention can realize the high-resolution thermal infrared remote sensing load external field substitution calibration under the ground, tower crane, airborne medium and low-altitude platforms and the like under the external field test condition, the maximum target radiation surface can reach 1.7m multiplied by 1.7m, and the surface source size is far larger than that of a laboratory black body; according to the invention, a large box-type semi-closed cavity is adopted, a built-in partition stainless steel electric heating tube is uniformly embedded in a whole aluminum block, multiple paths of temperature measuring elements are arranged at the bottom and the periphery of the target cavity, and a high-precision instrument is adopted to monitor and adjust the temperature of the whole electrically heated aluminum block, so that the stability, the uniformity and the real-time temperature change capability of the temperature of the target cavity are ensured; according to the invention, by combining cavity absorption and a surface absorption/diffusion theory, a micro-tube cavity array is taken as a basic unit, and the surface of a cavity is coated with a black extinction material; the micro-tube cavity array and the aluminum blocks at the bottom and around the target cavity are nested into a whole, so that the high emissivity and the uniformity of the target cavity are guaranteed.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.