A RCS test turntable based on laser heating

Abstract

The present invention relates to a RCS test turret based on laser heating, and a specific embodiment of the RCS test turret comprises: a turret housing, a plurality of laser heating probes, a laser distributor for controlling the output laser power of the laser heating probes, and a turret operating mechanism for driving the turret to move; wherein the plurality of laser heating probes are evenly spaced on the surface of the turret housing, and the laser output port of each laser heating probe is arranged outward; the laser distributor and the turret operating mechanism are arranged inside the turret. This embodiment can directly heat the test target to the required temperature for RCS testing without affecting the test field environment.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic characteristics, and in particular to an RCS test rotating top based on laser heating. Background Art

[0002] As an important indicator, Radar Cross Section (RCS) is gaining more and more attention. With the deepening of high-temperature target research, the demand for high-temperature target RCS testing is becoming stronger. At present, the mainstream RCS test sites are mainly divided into microwave compact field darkroom and outdoor test sites. The difference between the two is that the former uses compact field technology to achieve the far-field conditions of RCS testing, and uses shielding shells and absorbing materials to ensure the purity of the test area, while the latter uses a wide test site and a clean test environment to ensure the test effect. The test area is also called the "quiet zone". The quiet zone performance is an important indicator to measure the capability of the test site. Conventional test sites are not allowed to have any additional equipment in and near the quiet zone. Only target brackets are set to provide support for the target under test. There are two commonly used support methods in conventional RCS testing: low-density foam brackets and low-scattering metal brackets. The low-scattering metal bracket is equipped with a two-dimensional rotating top, which can be tightly connected to the interface at the bottom of the test target. The rotating top has a control and power structure inside, which can scan in both pitch and azimuth directions.

[0003] At present, high-temperature electromagnetic measurement is mainly based on high-temperature testing of materials, and the test of high-temperature RCS is mainly limited by the heating method. The heating and insulation devices cannot be moved away from the quiet area. Therefore, the target can only be heated first, and then the target is taken out and placed in the target area for testing. At this time, the temperature of the target cannot be controlled, and the real temperature distribution cannot be simulated. Therefore, a target support method that can continuously heat the target without affecting the test field environment is needed. Summary of the invention

[0004] In view of the defects in the prior art, the present invention provides an RCS test turntable based on laser heating, which can directly heat the test target to the required temperature for RCS testing without affecting the test field environment.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides an RCS test turntable based on laser heating.

[0006] The laser heating-based RCS test turret of an embodiment of the present invention is connected to a metal bracket, and the turret includes: a turret shell, a plurality of laser heating probes, a laser distributor for controlling the output laser power of the laser heating probes, and a turret operating mechanism for driving the turret to move; wherein the plurality of laser heating probes are evenly spaced on the surface of the turret shell, and the laser output port of each laser heating probe is arranged outward; the laser distributor and the turret operating mechanism are arranged inside the turret.

[0007] Optionally, the laser distributor is connected to each laser heating probe via an optical fiber, the laser distributor is connected to an optical fiber output laser outside the rotating top via an optical fiber, and the rotating top operation mechanism is electrically connected to a rotating top control cabinet outside the rotating top.

[0008] Optionally, the multiple laser heating probes are distributed in the same plane and are symmetrical about the rotation axis center of the rotating top.

[0009] Optionally, the metal bracket is a hollow structure, and the optical fiber between the laser distributor and the optical fiber output laser, and the control line and power line between the turntable operation mechanism and the turntable control cabinet are all arranged inside the metal bracket.

[0010] Optionally, the rotating top further includes: a flange at the bottom, the flange is fixed to an interface at the bottom of the test target to achieve fixation of the rotating top and the test target.

[0011] Optionally, the test target has a hollow structure; after the rotating top is fixed to the test target, the rotating top is located inside the test target.

[0012] Optionally, the angle and laser focal length of each laser heating probe are adjustable, and each laser heating probe has an infrared temperature sensing function.

[0013] Optionally, the material of the test target is a high temperature resistant material; when the test target is a metal material, the fiber output laser is a carbon dioxide laser; when the test target is a dielectric material, the fiber output laser is a semiconductor laser.

[0014] Optionally, the rotating top is in a frustum shape, and is used to heat the test target through the laser heating probe, so as to obtain a radar cross section (RCS) curve of the test target under different temperature conditions.

[0015] Optionally, the number of the laser heating probes is 8.

[0016] The implementation of the RCS test turret based on laser heating of the present invention has the following beneficial effects: the turret includes: a turret housing, a plurality of laser heating probes, a laser distributor for controlling the output laser power of the laser heating probes, and a turret operating mechanism for driving the turret to move; wherein the plurality of laser heating probes are evenly spaced on the surface of the turret housing, and the laser output port of each laser heating probe is arranged outward; the laser distributor and the turret operating mechanism are arranged inside the turret. Through the above structure, the temperature control of each heating area can be realized based on the infrared temperature detection function of the laser heating probe, and finally the precise control of the overall temperature distribution of the target can be realized, thereby obtaining the RCS change curve of the test target under different temperature conditions. At the same time, by hiding the heating mechanism in the turret and hiding the turret inside the test target, the heating mechanism and the turret can be prevented from affecting the test field environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an RCS test turntable based on laser heating in an embodiment of the present invention;

[0018] Figure 2 is a top view schematic diagram of an RCS test rotating top based on laser heating in an embodiment of the present invention;

[0019] Figure 3 is a first schematic diagram of a test target according to an embodiment of the present invention;

[0020] Figure 4 is a second schematic diagram of a test target according to an embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1: Laser heating probe; 2: Rotating top housing; 3: Metal bracket; 4: Rotating top operating mechanism; 5: Laser distributor; 6: Rotating top control cabinet; 7: Fiber output laser; 8: Flange; 9: Interface of test target. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Figure 1 is a schematic diagram of the structure of the RCS test turntable based on laser heating in an embodiment of the present invention, Figure 2is a top view schematic diagram of the RCS test top based on laser heating in an embodiment of the present invention, as shown Figure 1 and Figure 2 As shown, the rotating top is connected to the metal bracket 3 and is located above the metal bracket 3. The rotating top includes: a rotating top housing 2, a plurality of laser heating probes 1, a laser distributor 5 for controlling the output laser power of the laser heating probes 1, and a rotating top operating mechanism 4 for driving the movement of the rotating top.

[0025] Specifically, the rotating top is in a frustum shape, and is used to heat the test target located outside the rotating top through the laser heating probe 1, so as to obtain the radar cross section RCS curve of the test target under different temperature conditions.

[0026] In an embodiment of the present invention, the multiple laser heating probes 1 are evenly spaced on the surface of the rotating top housing 2, and the laser output port of each laser heating probe 1 is arranged outwardly so as to be able to emit laser outward to heat the test target outside the rotating top. Furthermore, the multiple laser heating probes 1 can be eight, distributed in the same plane, and symmetrical about the center of the rotating axis of the rotating top. In addition, the angle and laser focal length of each laser heating probe 1 can be automatically adjusted according to a preset program, or can be adaptively adjusted according to the current temperature, so as to automatically adjust the angle, area size and power of the heating spot. Each laser heating probe 1 also has an infrared temperature sensing function, thereby realizing temperature control of each heating area.

[0027] As a preferred solution, the laser distributor 5 and the turret operating mechanism 4 are arranged inside the turret, and the turret is inside the test target, so as to avoid affecting the test field environment. The laser distributor 5 is connected to each laser heating probe 1 through an optical fiber, and the laser distributor 5 is connected to the optical fiber output laser 7 outside the turret through an optical fiber, and the turret operating mechanism 4 is electrically connected to the turret control cabinet 6 outside the turret. The above optical fiber output laser 7 is used to provide a high-power beam for heating, and the turret control cabinet 6 is used to provide the power and command signals required for the turret movement.

[0028] Preferably, the metal bracket 3 is a hollow tubular structure, and the optical fiber between the laser distributor 5 and the optical fiber output laser 7, and the control line and power line (including power line) between the turntable operation mechanism 4 and the turntable control cabinet 6 are all arranged inside the metal bracket 3.

[0029] In practical applications, the rotating top may further include: a flange 8 at the bottom, the flange 8 is fixed to an interface 9 at the bottom of the test object to achieve the fixation of the rotating top and the test object. Figure 3 and Figure 4As shown, the test target has a hollow structure; after the rotating top is fixed to the test target, the rotating top is inside the test target, thereby avoiding the influence of the rotating top on the test field environment. In practical applications, the material of the test target is a high temperature resistant material (high temperature resistant material refers to a material that can withstand a preset temperature); when the test target is a metal material, the optical fiber output laser 7 is preferably a carbon dioxide laser; when the test target is a dielectric material, the optical fiber output laser 7 is preferably a semiconductor laser.

[0030] A specific embodiment of the present invention is described below.

[0031] The present invention discloses a metal turntable for high-temperature (the high temperature can be defined as a temperature greater than a preset threshold value according to actual scenarios) RCS testing using laser heating, which solves the problem of target support and heating during high-temperature RCS testing. Since the RCS test has high requirements for the area around the target being tested and it is difficult to deploy heating and insulation equipment, both microwave darkroom tests and field tests mainly conduct RCS tests at room temperature. In the RCS test at room temperature, there are two main support methods: a foam bracket with a one-dimensional turntable and a metal bracket with a two-dimensional turntable. The advantage of the two-dimensional turntable is that it is rigidly connected to the target and can perform two-dimensional posture scanning at a larger angle.

[0032] Indoor RCS test sites mainly use metal shielding shells and absorbing materials to construct a stable electromagnetic environment. The metal shielding shell can protect the test site from intentional or unintentional external electromagnetic signal interference, and the absorbing material laid in the metal shell is used to solve the reflection problem of electromagnetic waves in the shell. However, since most absorbing materials do not have high temperature resistance, and heating and insulation mechanisms are often installed near the test target, it is difficult to perform high-temperature RCS tests in traditional indoor RCS test sites. In order to solve the problem of difficulty in balancing target testing and target heating in traditional RCS test sites, a new metal rotating top design is proposed, which uses laser heating to control the target temperature, and hides the heating mechanism in the metal rotating top to hide the heating device.

[0033] Specifically, the above turntable adopts a truncated cone shape, a mechanical operating mechanism 4 is arranged inside the turntable, a bottom flange 8 is used to fix the test target, the turntable is mounted on a metal bracket 3, and the control lines, power lines and optical fibers required for laser heating required for the turntable are all laid through the hollow part inside the metal bracket 3.

[0034] The laser distributor 5 and the rotating top operation mechanism 4 are arranged inside the metal rotating top housing 2, and the laser distributor 5 is connected to the laser heating probe 1 by an optical fiber. The laser distributor 5 and the optical fiber output laser 7 are connected by an optical fiber, and the optical fiber is threaded inside the metal bracket 3. The optical fiber output laser 7 is used to provide a high-power beam used for heating, and the laser distributor 5 controls the laser power output by each laser heating probe 1. The rotating top operation mechanism 4 and the rotating top control cabinet 6 are connected by cables (including control cables and power cables), and the cables are threaded inside the metal bracket 3. The rotating top control cabinet 6 is used to provide the power and command signals required for the rotating top movement.

[0035] The test object should be high temperature resistant metal or other high temperature resistant rigid material, and a corresponding interface 9 should be left at the bottom.

[0036] The test target applicable to the above rotating top is a hollow shell, the shell material is high temperature resistant metal or other materials, and the interface 9 at the bottom of the test target is connected to the flange 8 at the bottom of the rotating top. Different test targets use different fiber output lasers. For metal targets, CO2 lasers are preferred, and for dielectric materials, semiconductor lasers are preferred. The laser output power is determined based on the heating temperature and carrier size.

[0037] Eight laser heating probes 1 are evenly distributed on the side of the rotating top for heating the target. The target temperature is controlled by controlling the laser heating intensity.

[0038] The laser heating probe 1 has the functions of laser beam output, focal length adjustment and infrared temperature sensing. The angle of the laser heating probe 1 can be fine-tuned to adjust the angle of the heating spot. The heating spot area and power can be adjusted by fine-tuning the focal length. Based on infrared temperature detection, the laser heating probe 1 can realize temperature control of each heating area, and finally realize precise control of the overall target temperature distribution. This heating method can rely on the known temperature distribution of the target or the simulated temperature distribution, simulate the actual temperature change of the target in the actual process, and obtain the RCS change curve under different temperature conditions.

[0039] In summary, in the technical solution of the embodiment of the present invention, the conventional external heating method is changed to heating inside the test target, and the laser heating method is used to achieve precise control and maintenance of the target temperature distribution, which solves the problem that it is difficult to perform high-temperature target RCS testing in conventional RCS test sites.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A RCS test turntable based on laser heating, characterized in that: The rotating top is connected to the metal bracket, and the rotating top includes: a rotating top shell, a plurality of laser heating probes, a laser distributor for controlling the output laser power of the laser heating probes, and a rotating top operation mechanism for driving the rotating top to move; wherein, The rotating top is in a truncated cone shape and is used to heat the test target through the laser heating probe, so as to obtain the radar cross section (RCS) curve of the test target under different temperature conditions; The metal bracket is a hollow structure, and the optical fiber between the laser distributor and the optical fiber output laser, as well as the control line and power line between the rotating top operation mechanism and the rotating top control cabinet are all arranged inside the metal bracket; The plurality of laser heating probes are evenly spaced and distributed on the same surface of the rotating top housing. The plurality of laser heating probes are symmetrical about the rotating axis center of the rotating top, and the laser output port of each laser heating probe is arranged outward. The laser distributor is connected to each laser heating probe via optical fiber, the laser distributor is connected to the optical fiber output laser outside the rotating top via optical fiber, and the rotating top operation mechanism is electrically connected to the rotating top control cabinet outside the rotating top.

2. The RCS test turntable according to claim 1, characterized in that: The rotating top further comprises: a flange at the bottom, the flange is fixed to the interface at the bottom of the test target so as to achieve the fixation of the rotating top and the test target.

3. The RCS test turntable according to claim 2, characterized in that: The test target has a hollow structure; after the rotating top is fixed to the test target, the rotating top is located inside the test target.

4. The RCS test turntable according to claim 1, characterized in that: The angle and laser focal length of each laser heating probe are adjustable, and each laser heating probe has an infrared temperature sensing function.

5. The RCS test turntable according to claim 3, characterized in that: The material of the test target is a high temperature resistant material; when the test target is a metal material, the fiber output laser is a carbon dioxide laser; when the test target is a dielectric material, the fiber output laser is a semiconductor laser.

6. The RCS test turntable according to claim 1, characterized in that: The number of the laser heating probes is 8.

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