CN117699068A - Two-dimensional pointing mirror thermal control device for optical load and two-dimensional pointing mirror - Google Patents
Two-dimensional pointing mirror thermal control device for optical load and two-dimensional pointing mirror Download PDFInfo
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- CN117699068A CN117699068A CN202311845534.XA CN202311845534A CN117699068A CN 117699068 A CN117699068 A CN 117699068A CN 202311845534 A CN202311845534 A CN 202311845534A CN 117699068 A CN117699068 A CN 117699068A
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- thermal control
- direction motor
- mirror
- pointing mirror
- dimensional pointing
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- 230000003287 optical effect Effects 0.000 title claims abstract description 23
- 239000010409 thin film Substances 0.000 claims abstract description 29
- 239000003973 paint Substances 0.000 claims abstract description 26
- 239000010408 film Substances 0.000 claims abstract description 21
- 230000008033 biological extinction Effects 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 abstract description 6
- 238000005507 spraying Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 description 26
- 238000010438 heat treatment Methods 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000005202 decontamination Methods 0.000 description 3
- 230000003588 decontaminative effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Control Of Resistance Heating (AREA)
Abstract
The invention provides a two-dimensional pointing mirror thermal control device of optical load and a two-dimensional pointing mirror, which comprises: film heater, thermal control white paint and extinction black paint; the two-dimensional pointing mirror is formed by connecting a Y-direction motor and an X-direction motor through the pointing mirror; the X-direction motor, the Y-direction motor, the directing mirror and the U-shaped frame are provided with thin film heaters; and spraying thermal control white paint on the surface of the X-direction motor, and spraying extinction black paint on the surface of the Y-direction motor, the surface of the U-shaped frame and the back of the pointing mirror. The motor, the frame, the directing mirror and other components in the invention are independently controlled in temperature, namely have heat dissipation capability and temperature compensation capability, can adapt to the complex heat flow change conditions on the track, and meet the application requirements of different tracks.
Description
Technical Field
The invention relates to the technical field of optical loads of spacecrafts, in particular to a two-dimensional pointing mirror thermal control device and a two-dimensional pointing mirror of an optical load.
Background
In order to scan the detected target at a large angle, the space optical load needs to use a two-dimensional rotating mechanism to drive the pointing mirror to rotate. In order to meet the requirement of high-precision on-track pointing, the structural framework needs to control the temperature gradient and control the thermal deformation within the range of the index requirement. In order to meet the requirements of high-reliability and long-service-life operation on the track, the motor on the pointing mechanism needs to be controlled in a proper temperature range. The reflection of the pointing mirror is sensitive to contaminants and requires a heating detergency to reduce the attachment of condensable volatiles to the surface. In order to meet the temperature control requirements of the components, independent heat control design is required for the important components of the pointing mechanism, and the layout position of the heat control assembly and the wiring direction of the heat control cable are designed according to the rotation characteristics of the two-dimensional mechanism, so that the reliable conduction of a circuit is realized and interference with the movement of the mechanism is avoided.
Through searching the prior art, three main thermal control measures of the traditional two-dimensional rotating mechanism for optical load are found: firstly, direct sunlight is isolated through a thermal control protection device, so that the temperature level and the temperature gradient of the mechanism are improved. For example, patent "a thermal control protection device for a spacecraft rotating mechanism" (patent number CN 212797390U), patent "a space optical camera light inlet heat insulation opening and closing mechanism" (patent number CN 104460192A), and patent "a thermal control device for a relative motion surface of an extra-satellite rotating mechanism" (patent number CN 107628275A), the method is a passive thermal control measure, and active regulation and control of the temperature level and the temperature gradient of a two-dimensional mechanism cannot be realized; and secondly, the rotating mechanism is integrally coated with a multi-layer heat insulation assembly, the multi-layer heat insulation assembly is supported by a framework device, the framework size is larger than the movement track envelope of the mechanism, so that the multi-layer heat insulation assembly is prevented from interfering with the mechanism, for example, patent No. CN 108820259A, which is an integral heat protection device suitable for multi-dimensional movement of the extra-satellite rotating mechanism, the method completely isolates adverse effects of external heat flow on the mechanism, but heat dissipation channels of heat dissipation components such as a motor are blocked, and the method is not suitable for two-dimensional mechanisms with long-term work or large work heat dissipation. Thirdly, isothermal heating of the scanning mechanism frame is carried out by externally attaching a heat pipe, heat on the frame is discharged by utilizing a heat radiating plate, and meanwhile, the temperature level and the temperature gradient of the frame are regulated and controlled by a heater, such as a scanning mechanism designed for isothermal heating (patent No. CN 103455060A), but the scanning mechanism is an integrated frame, and all sides of the frame do not have relative movement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a two-dimensional pointing mirror thermal control device for optical load and a two-dimensional pointing mirror.
The invention provides a two-dimensional pointing mirror thermal control device for optical load, which comprises: film heater, thermal control white paint and extinction black paint;
the two-dimensional pointing mirror is formed by connecting a pointing mirror with a Y-direction motor and an X-direction motor, and two ends of the pointing mirror are fixed on a U-shaped frame through bearings;
the X-direction motor, the Y-direction motor, the directing mirror and the U-shaped frame are provided with thin film heaters;
and spraying thermal control white paint on the surface of the X-direction motor, and spraying extinction black paint on the surface of the Y-direction motor, the surface of the U-shaped frame and the back of the pointing mirror.
Preferably, a thermistor is attached to a position where the thin film heater is disposed.
Preferably, the X-direction motor is provided with two thin film type heaters on the surface, the Y-direction motor is provided with two thin film type heaters on the surface, the back of the directing mirror is provided with two thin film type heaters, and two ends of the U-shaped frame are provided with one thin film type heater respectively.
Preferably, the film heater employs a polyimide copper foil electric heater known in the art.
Preferably, the power of the thin film heater of the X-direction motor is 10W per path, the power of the thin film heater of the Y-direction motor is 5W per path, the power of the thin film heater of the U-shaped frame is 6W per path, and the power of the thin film heater of the directing mirror is 15W per path.
Preferably, the thermistor type is MF501 type, known in the art.
Preferably, all of the thin film heaters and thermistors are connected to a thermal control cable.
Preferably, the pointing mirror is fixedly connected with a rotating shaft, one end of the rotating shaft is connected with a Y-direction motor, and the other end of the rotating shaft is connected with a rotary transformer.
Preferably, the thermal control cable at the position of the directing mirror sequentially rotates through the central hole of the rotating shaft and the central hole of the rotating transformer and then is led to the U-shaped frame, and is led out from the axis hole of the X-direction motor to the threading hole together with the thermal control cable of the U-shaped frame, and the led out thermal control cable and the lead bundle on the surface of the X-direction motor are connected to a single temperature controller.
Compared with the prior art, the invention has the following beneficial effects:
1. the motor, the frame, the directing mirror and other components in the invention are independently controlled in temperature, namely have heat dissipation capability and temperature compensation capability, can adapt to the complex heat flow change conditions on the track, and meet the application requirements of different tracks.
2. The invention makes the temperature gradient of the U-shaped frame of the two-dimensional rotating mechanism less than 1.2 ℃, the deformation of the mechanism is small, the pointing precision is high, and the risk of clamping stagnation is small.
3. The invention can make the directing mirror have heating decontamination capability, and reduce the risk of the mirror surface being polluted by water vapor and condensable volatile matters.
4. The invention has simple structure, the used material is a common product of a spacecraft, the used process is a mature process, the invention has high reliability and excellent temperature control performance, the pointing precision of the pointing mirror can be obviously improved, and the detection capability of optical load can be effectively ensured.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a two-dimensional pointing mirror thermal control device;
FIG. 2 is a schematic diagram of a pointing mirror configuration;
FIG. 3 is a graph showing the temperature difference between two ends of a U-shaped frame;
FIG. 4 is a graph of motor temperature variation;
FIG. 5 is a graph of temperature change during decontamination of a pointing mirror by heating;
the figure shows:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1
As shown in fig. 1, the two-dimensional pointing mirror is formed by connecting a pointing mirror 6 with a Y-direction motor 7 and an X-direction motor 8; the directional mirror 6 is fixedly connected with a rotating shaft 11, one end of the rotating shaft 11 is connected with the Y-direction motor 7, the other end of the rotating shaft is connected with the rotary transformer 10, and two ends of the directional mirror 6 are fixed on the U-shaped frame 12 through bearings.
The present embodiment provides a thermal control device for an optical load two-dimensional pointing mirror, comprising: a film heater 1, a pasting thermistor 2, a thermal control cable 3, a thermal control white paint 4 and a extinction black paint 5; the film heater 1 is arranged on the X-direction motor 8, the Y-direction motor 7, the directing mirror 6 and the U-shaped frame 12, the thermistor 2 is stuck at the position where the film heater 1 is arranged, and all the film heater 1 and the thermistor 2 are connected with the thermal control cable 3. The surface of the X-direction motor 8 is sprayed with thermal control white paint 4, and the surface of the Y-direction motor 7, the surface of the U-shaped frame 12 and the back of the pointing mirror 6 are sprayed with extinction black paint 5.
In a preferred embodiment, two thin film type heaters 1 are arranged on the surface of the X-direction motor 8, two thin film type heaters 1 are arranged on the surface of the Y-direction motor 7, two thin film type heaters 1 are arranged on the back surface of the directing mirror 6, one thin film type heater 1 is arranged at each of two ends of the U-shaped frame 12, the power of the thin film type heater 1 of the X-direction motor 8 is 10W per path, the power of the thin film type heater 1 of the Y-direction motor 7 is 5W per path, the power of the thin film type heater 1 of the U-shaped frame 12 is 6W per path, and the power of the thin film type heater 1 of the directing mirror 6 is 15W per path.
In a preferred embodiment, the film heater 1 is a polyimide copper foil electric heater, and the thermistor 2 is of type MF 501.
As shown in fig. 2, in a preferred embodiment, the thermal control cable 3 at the position of the pointing mirror 6 sequentially rotates through the central hole of the rotating shaft 11 and the central hole of the rotary transformer 10, is led to the U-shaped frame 12, and is led out together with the thermal control cable 3 of the U-shaped frame 12 from the axial hole of the X-direction motor 8 to the threading hole 9, and the led out thermal control cable 3 and a wire bundle on the surface of the X-direction motor 8 are connected to a single temperature controller.
The U-shaped frame 12 has uneven heat consumption distribution, and heat flow outside the external space irradiates at different angles, so that a large temperature gradient (about 12 ℃ at maximum) exists, and structural deformation is caused when the temperature gradient is serious, so that the rotation of the mechanism is affected. In this embodiment, the temperature difference between two ends of the U-shaped frame 12 can be controlled by the film-shaped heaters 1 distributed at two ends of the U-shaped frame 12, that is, the power of the film-shaped heaters 1 is adjusted according to the feedback of temperature signals of two ends of the U-shaped frame 12: the thin film heater 1 at one side with low temperature has increased power, the power at one side with high temperature is reduced, or heating is stopped, and finally, the temperature gradient at two ends is controlled in a smaller range (less than 1.2 ℃), the deformation of the mechanism is small, the pointing precision is high, the risk of clamping stagnation is small, and the on-track high-reliability and long-service-life operation of the steering mechanism is met.
Example 2
Example 2 is a preferred example of example 1.
As shown in fig. 1 and 2, the present embodiment includes: a film heater 1, a thermistor 2, a thermal control cable 3, a thermal control white paint 4 and a extinction black paint 5. Two paths of film heaters 1 are distributed on the surface of a shell of the X-direction motor 8 to carry out closed-loop temperature control, and thermal control white paint 4 is sprayed; two paths of film heaters 1 are distributed on the surface of a shell of the Y-direction motor 7 to carry out closed-loop temperature control, and extinction black paint 5 is sprayed on the surface; one thin film heater 1 is respectively distributed at the two ends of the U-shaped frame 12 to control the temperature difference at the two ends of the U-shaped frame 12, and extinction black paint 5 is sprayed on the surface; two thin film heaters 1 are distributed on the back of the directing mirror 6, and extinction black paint 5 is sprayed; and a thermistor 2 is stuck at a corresponding position on the component on which the film heater 1 is arranged and is used as a reference point for closed-loop temperature control of the film heater 1.
The thermal control cable 3 on the back of the directing mirror 6 passes through the central hole of the rotating shaft 11 and the central hole of the rotary transformer 10 to be led to the U-shaped frame 12, the thermal control cable 3 on the U-shaped frame 12 is led out from the threading hole 9 above the axial hole of the X-direction motor 8, and the wires on the surface of the X-direction motor 8 and the thermal control cable 3 coming out of the threading hole are clustered to be led to a single temperature controller.
The film heater 1 can perform closed-loop control according to a set temperature control threshold value, and the threshold value can be adjusted in-orbit fluence. The thermal control white paint 4 is a thermal control coating with high emissivity and low solar absorptivity (the emissivity is more than or equal to 0.85, the solar absorptivity is less than or equal to 0.2), the extinction black paint 5 is a coating with high emissivity and high solar absorptivity (the emissivity is more than or equal to 0.92, and the solar absorptivity is more than or equal to 0.92), the thermal control white paint 4 is beneficial to heat dissipation, and the extinction black paint 5 can prevent stray light from influencing an optical path.
As shown in fig. 3 to 5, fig. 3 shows that the temperature difference at two ends of the U-shaped frame 12 can be controlled within 0 ℃ ± 1 ℃, the temperature difference control capability is good, fig. 4 shows that the temperature ranges of two motors of the pointing mechanism can be controlled within 4-14 ℃, the temperature level is proper, and fig. 5 shows that the pointing mirror 6 can be heated to 25-30 ℃, so as to meet the heating decontamination requirement.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. A two-dimensional pointing mirror thermal control device for optical loading, comprising: a film heater (1), a thermal control white paint (4) and a extinction black paint (5);
the two-dimensional pointing mirror is formed by connecting a pointing mirror (6) with a Y-direction motor (7) and an X-direction motor (8), and two ends of the pointing mirror (6) are fixed on a U-shaped frame (12) through bearings;
the thin film heater (1) is arranged on the X-direction motor (8), the Y-direction motor (7), the pointing mirror (6) and the U-shaped frame (12);
and the surface of the X-direction motor (8) is sprayed with thermal control white paint (4), and the surface of the Y-direction motor (7), the surface of the U-shaped frame (12) and the back of the directing mirror (6) are sprayed with extinction black paint (5).
2. The two-dimensional pointing mirror thermal control device of optical loading of claim 1, wherein: a thermistor (2) is attached to the position where the thin film heater (1) is arranged.
3. The two-dimensional pointing mirror thermal control device of optical loading of claim 1, wherein: two paths of thin film type heaters (1) are distributed on the surface of the X-direction motor (8), two paths of thin film type heaters (1) are distributed on the surface of the Y-direction motor (7), two paths of thin film type heaters (1) are distributed on the back of the pointing mirror (6), and one path of thin film type heaters (1) are distributed at two ends of the U-shaped frame (12).
4. The two-dimensional pointing mirror thermal control device of optical loading of claim 1, wherein: the film heater (1) adopts a polyimide copper foil electric heating sheet heater.
5. The two-dimensional pointing mirror thermal control device of optical loading of claim 1, wherein: the power of the film heater (1) of the X-direction motor (8) is 10W in each path, the power of the film heater (1) of the Y-direction motor (7) is 5W in each path, the power of the film heater (1) of the U-shaped frame (12) is 6W in each path, and the power of the film heater (1) of the directing mirror (6) is 15W in each path.
6. The two-dimensional pointing mirror thermal control device for optical loads according to claim 2, wherein: the thermistor (2) is of the type MF 501.
7. The two-dimensional pointing mirror thermal control device for optical loads according to claim 2, wherein: all the film type heaters (1) and the thermistors (2) are connected with a thermal control cable (3).
8. The two-dimensional pointing mirror thermal control device for optical loads of claim 7, wherein: the pointing mirror (6) is fixedly connected with a rotating shaft (11), one end of the rotating shaft (11) is connected with a Y-direction motor (7), and the other end of the rotating shaft is connected with a rotary transformer (10).
9. The two-dimensional pointing mirror thermal control device for optical loads of claim 8, wherein: the thermal control cable (3) at the position of the directing mirror (6) sequentially rotates through a central hole of the rotating shaft (11) and a central hole of the rotary transformer (10) and then is led to the U-shaped frame (12), and is led out from an axis hole of the X-direction motor (8) to the threading hole (9) together with the thermal control cable (3) of the U-shaped frame (12), and the led out thermal control cable (3) and a wire bundle on the surface of the X-direction motor (8) are connected to a single temperature controller.
10. A two-dimensional pointing mirror, characterized by: a two-dimensional pointing mirror thermal control device employing the optical load of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311845534.XA CN117699068A (en) | 2023-12-28 | 2023-12-28 | Two-dimensional pointing mirror thermal control device for optical load and two-dimensional pointing mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311845534.XA CN117699068A (en) | 2023-12-28 | 2023-12-28 | Two-dimensional pointing mirror thermal control device for optical load and two-dimensional pointing mirror |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117699068A true CN117699068A (en) | 2024-03-15 |
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ID=90163570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311845534.XA Pending CN117699068A (en) | 2023-12-28 | 2023-12-28 | Two-dimensional pointing mirror thermal control device for optical load and two-dimensional pointing mirror |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117699068A (en) |
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2023
- 2023-12-28 CN CN202311845534.XA patent/CN117699068A/en active Pending
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