In-situ detection device and method for space uniformity of solar irradiation energy

Abstract

The invention discloses an in-situ detection device and method for space uniformity of solar irradiation energy, relates to an in-situ detection device and method, and belongs to the technical field of space simulation tests. The invention aims to solve the problem that the existing method can only be carried out in an atmospheric environment and cannot realize in-situ detection in a vacuum low-temperature environment. The in-situ detection device comprises a vacuum container, a solar simulator, an in-situ mechanism, a detection probe, a motion control system, a data collector and terminal software, the solar simulator is installed at the top of the vacuum container, the in-situ mechanism is arranged at the bottom in the vacuum container, the detection probe is installed on a detection probe installation plane of the in-situ mechanism, the motion control system is connected with the in-situ mechanism, and the computer of the terminal software is connected with the motion control system. And the signal receiving end of the data collector is connected with the signal transmitting end of the detection probe. The device and the method are used for realizing in-situ detection of the solar irradiation energy in the vacuum low-temperature test cabin.

Description

Technical Field

[0001] The invention relates to an in-situ detection device and method, belonging to the technical field of space simulation test. Background Art

[0002] The solar simulator is an important part of the ground simulation test of the space environment. It can accurately simulate the collimation, uniformity and spectral characteristics of solar radiation, and has a high precision of simulating heat flow outside space. It is mainly used for thermal balance tests of spacecraft, material aging tests, etc. The uniformity of solar radiation energy is one of the important indicators for evaluating the radiation characteristics of solar simulators.

[0003] At present, solar cell arrays are usually used to detect the uniformity of solar radiation energy. Different solar cell arrays need to be designed for different irradiation areas. This method is complex to operate and has poor versatility. In addition, a single solar cell can be mounted on a mechanism to scan the solar irradiation surface for uniformity detection. However, this method can only be performed in an atmospheric environment and cannot achieve in-situ detection in a vacuum low-temperature environment. The above methods all detect the planar uniformity of solar radiation energy, but in certain cases, the spatial uniformity of solar radiation energy needs to be given.

[0004] In summary, the present invention provides a method for in-situ detection of spatial uniformity of solar radiation energy in a vacuum and low-temperature environment, so as to make up for the shortcomings of the current method. Summary of the invention

[0005] In order to solve the problem that the existing method can only be performed in an atmospheric environment and cannot realize in-situ detection in a vacuum low-temperature environment, the present invention further proposes an in-situ detection device and method for spatial uniformity of solar radiation energy.

[0006] The technical solution adopted by the present invention to solve the above problems is: the in-situ detection device of the present invention comprises a vacuum container, a solar simulator, an in-situ mechanism, a detection probe, a motion control system, a data collector and terminal software;

[0007] The solar simulator is installed on the top of the vacuum container, the in-situ mechanism is arranged at the bottom of the vacuum container, the detection probe is installed on the detection probe installation plane of the in-situ mechanism, the motion control system is connected with the in-situ mechanism, the terminal software configured in the computer is used to realize the control of the motion control system, and the signal receiving end of the data acquisition device is connected with the signal transmitting end of the detection probe.

[0008] Further, it includes aluminum foil and multiple grounding wires;

[0009] Aluminum foil is coated on the cable in the vacuum cabin of the vacuum container, and the coating thickness is greater than or equal to 1 mm. Multiple grounding wires are used to segmentally ground the aluminum foil on the surface of the cable in the vacuum cabin.

[0010] The detection probe is a silicon photocell module, which measures solar radiation energy and converts it into millivolt voltage output.

[0011] Further, the motion control system includes a servo motor, a rotary transformer, a servo drive and a motion controller;

[0012] The servo motor is connected to the motion axis of the in-situ mechanism, the rotary transformer detects the motion position of the in-situ mechanism, the servo driver is connected to the servo motor, the servo driver is connected to the motion controller through the EtherCAT bus, the motion controller is connected to the computer of the terminal software through Ethernet, and the terminal software realizes remote monitoring of the in-situ mechanism through the motion controller.

[0013] Furthermore, the terminal software is connected to the motion control system via Modbus TCP and realizes data exchange therewith, and the terminal software realizes remote monitoring of the in-situ mechanism via the telecontrol system.

[0014] Furthermore, the terminal software is connected to the data collector via Modbus RTU and implements data interaction therewith.

[0015] The specific steps of the in-situ detection method of the present invention include:

[0016] Step 1: Start the vacuum molecular pump to establish a vacuum environment in the vacuum container, and introduce low-temperature liquid nitrogen to establish a low-temperature environment in the vacuum container;

[0017] Step 2: Select two solar constants for the irradiance of the solar simulator. The solar irradiation area is greater than Φ1000mm. Wait for the solar simulator to stabilize for one minute before starting the in-situ measurement of the irradiation energy.

[0018] Step 3: Install the detection probe at the center of the detection probe installation plane of the in-situ mechanism, and control the in-situ mechanism in the X direction through the terminal software;

[0019] Step 4: When the in-situ mechanism is in spatial motion, the motion control system collects the center position information of the installation plane of the detection probe of the in-situ mechanism in real time, and the data collector collects the solar radiation energy in real time;

[0020] Step 5: The motion control system and data collector upload the collected information to the terminal software in real time. The terminal software performs spatiotemporal matching of the position information of the in-situ mechanism and the solar radiation energy to generate a spatial uniformity detection result.

[0021] Furthermore, in step 1, when the vacuum degree is lower than 5×10 -3 When the heat sink temperature is lower than 100K, turn on the solar simulator.

[0022] Furthermore, in step 3, a cross-shaped motion is performed in the Y and Z planes of the in-situ mechanism every 20 mm, and the cross-shaped motion trajectory area does not exceed Φ1000 mm.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention provides an in-situ detection method for the spatial uniformity of solar radiation energy, which performs environmental adaptability design and motion accuracy compensation on the detection system, effectively expands the working scenario of the solar radiation energy detection system under the atmospheric environment, and can realize the in-situ detection of solar radiation energy in a vacuum low-temperature test chamber;

[0025] 2. The in-situ detection method of the spatial uniformity of solar radiation energy provided by the present invention can not only realize the plane uniformity detection of solar radiation energy, but also realize the spatial uniformity detection of solar radiation energy, and has a larger detection space and more complete detection results;

[0026] 3. The in-situ detection method of the spatial uniformity of solar radiation energy provided by the present invention performs electromagnetic shielding on the cable and performs operational amplification on the detection signal, thereby reducing interference in the signal transmission process and making the detection result of solar radiation energy more stable;

[0027] 4. The present invention provides an in-situ detection method for the spatial uniformity of solar radiation energy. The in-situ mechanism can be equipped with an energy detection module to automatically operate, measure the solar radiation energy in real time, and generate uniformity detection results through terminal software. The detection process is simpler, more efficient and intelligent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the in-situ detection system of the spatial uniformity of solar radiation energy;

[0029] Figure 2 It is a three-dimensional model of the mechanical structure of the in-situ mechanism;

[0030] Figure 3 It is a schematic diagram of cable electromagnetic shielding protection design;

[0031] Figure 4 It is a schematic diagram of the motion control system structure;

[0032] Figure 5 This is an example diagram of the spatial motion trajectory points of the in-situ mechanism;

[0033] Figure 6 This is a test result diagram of the spatial uniformity of solar radiation energy;

[0034] Figures 1 to 6Among them, 1-vacuum container, 2-solar simulator, 3-solar irradiation area, 4-in-situ mechanism, 5-detection probe, 6-motion control system, 7-data acquisition device, 8-terminal software, 9-linear movement degree of freedom along Y axis, 10-linear movement degree of freedom along Z axis, 11-linear movement degree of freedom along X axis, 12-rotational movement degree of freedom around X axis, 13-rotational movement degree of freedom around Y axis, 14-detection probe installation plane, 15-cables in vacuum cabin, 16-aluminum foil, 17-ground wire, 18-servo motor, 19-rotating transformer, 20-servo drive, 21-motion controller. DETAILED DESCRIPTION

[0035] Specific implementation method 1: Figure 1 As shown, an in-situ detection device for the spatial uniformity of solar radiation energy includes a vacuum container 1, a solar simulator 2, an in-situ mechanism 4, a detection probe 5, a motion control system 6, a data collector 7 and a terminal software 8;

[0036] The solar simulator 2 is installed on the top of the vacuum container 1. The solar radiation generated by the solar simulator 2 irradiates the vacuum container 1, forming a solar irradiation area 3 above the detection probe 5. The in-situ mechanism 4 is fixed to the bottom of the vacuum container 1. The detection probe 5 is installed on the detection probe installation plane 14 of the in-situ mechanism 4. The motion control system 6 is connected to the in-situ mechanism 4. The terminal software 8 installed in the computer is connected to the motion control system 6. The signal receiving end of the data acquisition device 7 is connected to the signal transmitting end of the detection probe 5.

[0037] Among them, the vacuum container 1 can provide a vacuum degree better than 5×10 -3 Pa, testing environment with temperature below 100K;

[0038] The solar simulator 2 is capable of providing irradiation of 0.5-2 solar constants, and the effective irradiation range does not exceed the motion limit of the in-situ mechanism 4;

[0039] The data collector 7 selects a millivoltmeter with RS485 communication function.

[0040] like Figure 2 As shown, the in-situ mechanism 4 has five degrees of freedom, namely, a linear motion degree of freedom 9 along the Y axis, a linear motion degree of freedom 10 along the Z axis, a linear motion degree of freedom 11 along the X axis, a rotational motion degree of freedom 12 around the X axis and a rotational motion degree of freedom 13 around the Y axis. The linear motion degree of freedom 9 along the Y axis, the linear motion degree of freedom 10 along the Z axis and the linear motion degree of freedom 11 along the X axis can carry the detection probe 5 to perform spatial scanning in the solar irradiation area 3, and the rotational motion degree of freedom 12 around the X axis and the rotational motion degree of freedom 13 around the Y axis can adjust the parallelism between the detection probe 5 and the surface of the solar irradiation area 3;

[0041] When the in-situ mechanism 4 works in the vacuum and low temperature environment of the vacuum container 1, it is necessary to perform environmental adaptability design and motion accuracy compensation to improve its motion reliability and uniformity detection accuracy;

[0042] Among them, a symmetrical structure is adopted to ensure uniform deformation of the in-situ mechanism 4, a "ball screw + double guide slider" is adopted to realize the linear movement of the Y-axis and Z-axis, and a "ball screw + squirrel cage guide support mechanism" is adopted to realize the linear movement in the X-axis direction. The mechanism rotating around the X-axis direction is designed as a symmetrical U-shaped structure.

[0043] Among them, Sinda / G software is used to perform thermal analysis simulation calculations on the in-situ mechanism 4, and its cooling characteristics in a vacuum and low-temperature environment are analyzed. The heating power is designed according to the simulation calculation results, and the heating plate and temperature measuring points are designed according to the designed power distribution diagram. The heating plate and temperature measuring points are pasted on the key moving parts of the in-situ mechanism 4 to realize its automatic thermal control in a vacuum and low-temperature environment.

[0044] The motion accuracy compensation includes single-axis accuracy compensation and kinematic accuracy compensation. The single-axis accuracy compensation is to calibrate the single-axis motion accuracy of the original mechanism through a laser tracker, and improve the single-axis motion accuracy by designing a correction coefficient. The kinematic accuracy compensation is to calibrate the installation accuracy of the original mechanism through a laser tracker, and compensate for the installation error during the inverse kinematics solution.

[0045] Specific implementation method 2: Figure 3 As shown, in order to provide electromagnetic shielding protection for the cable 15 in the vacuum chamber of the vacuum container 1, the cable 15 is coated with aluminum foil 16 with a coating thickness greater than 1 mm, and the aluminum foil 16 on the surface of the cable is grounded in sections using a grounding wire 17.

[0046] Specific implementation method three: Figure 1 As shown, the detection probe 5 selects a silicon photocell module, which measures solar radiation energy and converts it into millivolt voltage for output. In order to reduce the interference of the voltage signal during the transmission through the cabin, the voltage signal is sent to the data collector 7 after passing through an operational amplifier.

[0047] Specific implementation method four: Figure 4As shown, the motion control system 6 includes a servo motor 18, a rotary transformer 19, a servo driver 20 and a motion controller 21. The servo motor 18 drives the motion axis of the in-situ mechanism, the rotary transformer 19 detects the motion position of the in-situ mechanism, the servo driver 20 drives the servo motor 18, the servo driver 20 is connected to the motion controller 21 via the EtherCAT bus, the motion controller 21 is connected to the computer of the terminal software 8 via Ethernet, and the terminal software 8 realizes remote monitoring of the in-situ mechanism through the motion controller 21.

[0048] Specific implementation method five: the terminal software 8 is connected to the motion control system 6 via Modbus TCP and realizes data interaction therewith, and the terminal software 8 can realize remote monitoring of the in-situ mechanism 4 through the telecontrol system; the terminal software 8 is connected to the data collector 7 via Modbus RTU and realizes data interaction therewith. The terminal software 8 performs spatiotemporal matching of the position information of the in-situ mechanism 4 and the solar radiation energy, and generates a spatial uniformity distribution diagram of the solar radiation energy.

[0049] Specific implementation method six: Figures 1 to 5 As shown, an in-situ detection method for spatial uniformity of solar radiation energy comprises the following specific steps:

[0050] Step 1: Start the vacuum molecular pump to establish a vacuum environment in the vacuum container 1, and introduce low-temperature liquid nitrogen to establish a low-temperature environment in the vacuum container 1;

[0051] Step 2: Select two solar constants for the irradiance of the solar simulator 2, the solar irradiation area 3 is greater than Φ1000mm, wait for the solar simulator 2 to stabilize for one minute, and then start the in-situ measurement of the irradiation energy;

[0052] Step 3, install the detection probe 5 at the center of the detection probe installation plane 14 of the in-situ mechanism 4, and control the in-situ mechanism 4 in the X direction through the terminal software 8;

[0053] Step 4: When the in-situ mechanism 4 is in spatial motion, the motion control system 6 collects the center position information of the detection probe installation plane 14 of the in-situ mechanism 4 in real time, and the data collector 7 collects the solar radiation energy in real time;

[0054] Step 5: The motion control system 6 and the data collector 7 upload the collected information to the terminal software 8 in real time. The terminal software 8 performs spatiotemporal matching of the position information of the in-situ mechanism 4 and the solar radiation energy to generate a spatial uniformity detection result.

[0055] Specific implementation method seven: Figures 1 to 5 As shown in step 1, when the vacuum degree is lower than 5×10 -3 When the heat sink temperature is lower than 100K, the solar simulator 2 is turned on.

[0056] Specific implementation of waterproofing eight: Figures 1 to 5 As shown, in step 3, a cross-shaped motion is performed in the Y and Z planes of the in-situ mechanism 4 every 20 mm, and the cross-shaped motion trajectory area does not exceed Φ1000 mm.

[0057] Example

[0058] Reference Figure 5 and Figure 6 , measure the body irradiation uniformity within 100mm along the irradiation direction of the solar simulator, the irradiation range is a circular area with a diameter of Φ1000mm, take the "space environment ground simulation device" comprehensive irradiation test cabin as an example, the specific implementation steps are as follows:

[0059] Step 1: Check the vacuum system, heat sink system, solar simulator equipment, in-situ mechanism and related measuring equipment of the comprehensive irradiation test chamber. After ensuring that all equipment is working properly, close the door of the comprehensive irradiation test chamber and perform leak detection on the chamber.

[0060] Step 2: After the leak detection work in the comprehensive irradiation test chamber is completed, start the roughing unit and the cryogenic pump in sequence according to the operating procedures of the vacuum system, and monitor the vacuum degree through the vacuum silicon in the test chamber;

[0061] Step 3: The heat sink system of the comprehensive irradiation test chamber starts to work, low-temperature liquid nitrogen is introduced into the heat sink pipe in the chamber, and the temperature in the chamber is monitored by the temperature sensor on the test chamber wall;

[0062] Step 4: When the air pressure in the test chamber is lower than 5×10 -3 Pa, when the temperature is lower than 100K, the formal test can begin;

[0063] Step 5, controlling the in-situ mechanism to rotate around the X and Y axes, optionally, setting the rotation speed to 5 / s, setting the target angle to 0, so that the test surface of the detection probe is parallel to the irradiation surface;

[0064] Step 6: Set the solar radiation energy to 2 solar constants, turn on the solar simulator, and wait for 1 minute;

[0065] Step 7: Control the in-situ mechanism to move 20mm, 40mm, 60mm, 80mm and 100mm upward along the X axis at a speed of 10mm / s. At different heights, control the X and Y axis linear motion of the in-situ mechanism to be linked. The linkage trajectory is as follows: Figure 5 As shown, during the linkage process, the detection probe measures the solar radiation energy with a period of 50ms;

[0066] Step 8: The terminal software obtains the detection probe (XYZ) coordinate value and the corresponding solar radiation energy, and draws a contour map based on the obtained data to obtain the following: Figure 6 The results of the solar radiation energy distribution are shown.

[0067] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. An in-situ detection device for spatial uniformity of solar radiation energy, characterized in that: It comprises a vacuum container (1), a solar simulator (2), an in-situ mechanism (4), a detection probe (5), a motion control system (6), a data acquisition device (7) and terminal software (8); The solar simulator (2) is installed on the top of the vacuum container (1), the in-situ mechanism (4) is arranged at the bottom of the vacuum container (1), the detection probe (5) is installed on the detection probe installation plane (14) of the in-situ mechanism (4), the motion control system (6) is connected to the in-situ mechanism (4), the terminal software (8) configured in the computer is used to control the motion control system (6), and the signal receiving end of the data acquisition device (7) is connected to the signal transmitting end of the detection probe (5).

2. The in-situ detection device for spatial uniformity of solar radiation energy according to claim 1, characterized in that: It also includes aluminum foil (16) and a plurality of grounding wires (17); The aluminum foil (16) is coated on the cable (15) in the vacuum chamber of the vacuum container (1), and the coating thickness is greater than or equal to 1 mm. A plurality of grounding wires (17) are used to perform segmented grounding on the aluminum foil (16) on the surface of the cable (15) in the vacuum chamber.

3. The in-situ detection device for spatial uniformity of solar radiation energy according to claim 1, characterized in that: The detection probe (5) is a silicon photocell module, which measures solar radiation energy and converts it into millivolt voltage output.

4. The in-situ detection device for spatial uniformity of solar radiation energy according to claim 1, characterized in that: The motion control system (6) includes a servo motor (18), a rotary transformer (19), a servo driver (20) and a motion controller (21); The servo motor (18) is connected to the motion axis of the home-position mechanism (4); the rotary transformer (19) detects the motion position of the home-position mechanism (4); the servo driver (20) is connected to the servo motor (18); the servo driver (20) is connected to the motion controller (21) via an EtherCAT bus; the motion controller (21) is connected to a computer of the terminal software (8) via Ethernet; and the terminal software (8) realizes remote monitoring of the home-position mechanism (4) via the motion controller (21).

5. The in-situ detection device for spatial uniformity of solar radiation energy according to claim 1, characterized in that: The terminal software (8) is connected to the motion control system (6) via Modbus TCP and realizes data interaction therewith, and the terminal software (8) realizes remote monitoring of the in-situ mechanism (4) via the telecontrol system.

6. The in-situ detection device for spatial uniformity of solar radiation energy according to claim 1, characterized in that: The terminal software (8) is connected to the data collector (7) via Modbus RTU and implements data interaction therewith.

7. An in-situ detection method for spatial uniformity of solar radiation energy, characterized in that: The specific steps include: Step 1, start the vacuum molecular pump to establish a vacuum environment of the vacuum container (1), and introduce low-temperature liquid nitrogen to establish a low-temperature environment of the vacuum container (1); Step 2: The irradiance of the solar simulator (2) is selected with two solar constants, the solar irradiation area (3) is larger than Φ1000mm, and after the solar simulator (2) is stabilized for one minute, the irradiation energy in-situ measurement is started; Step 3, installing the detection probe (5) at the center of the detection probe installation plane (14) of the in-situ mechanism (4), and controlling the in-situ mechanism (4) in the X direction through the terminal software (8); Step 4: When the in-situ mechanism (4) is in spatial motion, the motion control system (6) collects the central position information of the detection probe installation plane (14) of the in-situ mechanism (4) in real time, and the data collector (7) collects the solar radiation energy in real time; Step 5: The motion control system (6) and the data collector (7) upload the collected information to the terminal software (8) in real time. The terminal software (8) performs spatiotemporal matching of the position information of the in-situ mechanism (4) and the solar radiation energy to generate a spatial uniformity detection result.

8. The in-situ detection method of solar radiation energy spatial uniformity according to claim 7, characterized in that: In step 1, when the vacuum degree is lower than 5×10 -3 When the heat sink temperature is lower than 100K, the solar simulator (2) is turned on.

9. The in-situ detection method of solar radiation energy spatial uniformity according to claim 7 or 8, characterized in that: In step 3, a cross-shaped motion is performed in the Y and Z planes of the in-situ mechanism (4) every 20 mm, and the cross-shaped motion track area does not exceed Φ1000 mm.

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