CN109557743B - Aerial camera focal plane temperature control system and control method thereof - Google Patents
Aerial camera focal plane temperature control system and control method thereof Download PDFInfo
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- CN109557743B CN109557743B CN201811540452.3A CN201811540452A CN109557743B CN 109557743 B CN109557743 B CN 109557743B CN 201811540452 A CN201811540452 A CN 201811540452A CN 109557743 B CN109557743 B CN 109557743B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
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Abstract
The invention relates to the technical field of aerial cameras, in particular to an aerial camera temperature control system and a control method thereof. The invention provides a system for controlling the temperature of an aerial camera focal plane assembly and a control method thereof, aiming at the problem that the imaging performance of an aerial camera is influenced by overhigh or overlow temperature. The control system comprises a temperature sensor, a temperature controller, at least one temperature control device and a mounting flange. In the temperature control system, the real-time temperature of the focal plane component of the aerial camera is monitored through the temperature sensor, the temperature controller judges whether the temperature read by the temperature sensor exceeds a preset threshold value or not, and when the temperature is higher than the upper limit of the preset threshold value, the temperature controller activates the refrigerating solid-state relay to start the Peltier refrigerating in the temperature control device; and when the temperature is lower than the lower limit of the preset threshold, the temperature controller activates the heating solid-state relay to start the Peltier heating in the temperature control device. Thereby achieving control of the temperature of the focal plane assembly.
Description
Technical Field
The invention belongs to the technical field of aerial cameras, and particularly relates to a focal plane temperature control system and a focal plane temperature control method of an aerial camera.
Background
The focal plane component of the aerial camera generally consists of a highly integrated area array detector or a linear array detector, optical signals are converted into electric signals to be stored during working, and the focal plane component is a key component of the aerial camera and has decisive influence on the performance of the camera. The focal plane assembly has strict requirements on temperature, electronic equipment such as a detector and control equipment in the focal plane assembly cannot be started normally due to too low temperature, an aerial camera cannot image, dark current and noise of the detector are increased due to too high temperature, the signal-to-noise ratio of the system is reduced, and imaging quality is affected. Therefore, the temperature stability design needs to be carried out on the focal plane of the aerial camera, the reliability of the aerial camera can be improved by the reasonable and effective temperature stability device, and the imaging quality of the aerial camera is ensured.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a control system and a control method capable of ensuring the temperature stability of an aerial camera focal plane assembly, and solves the problems that the focal plane cannot work at low temperature and the imaging performance of the aerial camera is reduced due to overhigh ambient temperature or long-time work.
The invention provides a focal plane temperature control system of an aerial camera, which comprises a temperature sensor, a temperature controller, at least one temperature control device and a mounting flange, wherein the temperature sensor is arranged on the mounting flange;
the temperature sensor is arranged on the focal plane assembly, and measures the current temperature of the focal plane assembly;
the temperature controller reads the temperature of the temperature sensor and outputs an instruction to the temperature control device according to the temperature;
the temperature control device is connected with the focal plane assembly through the mounting flange, and the temperature control device adjusts the temperature of the focal plane assembly according to an instruction output by the temperature controller;
the mounting flange is made of heat conducting materials, and the focal plane assembly temperature adjustment is realized through heat energy conduction of the mounting flange.
Further, when temperature control device is more than two, the mutual parallel connection of temperature control device and simultaneous working, temperature controller includes first relay and second relay, and first relay is used for driving mutual parallel connection temperature control device heats, and the second relay is used for driving mutual parallel connection temperature control device refrigerates.
Furthermore, when the temperature control devices are more than two, each temperature control device works independently, the temperature controller is provided with a first relay and a second relay for each temperature control device, wherein the first relay is used for driving the temperature control devices to heat, and the second relay is used for driving the temperature control devices to refrigerate.
Further, the temperature control device comprises a heat shield, a containing cavity formed by the waveguide plate in a surrounding mode, and a Peltier, a cooling fin and a fan which are sequentially arranged from the bottom of the heat shield to the waveguide plate.
Preferably, the peltier comprises a first insulating heat-conducting plate, a second insulating heat-conducting plate, a semiconducting portion and a heat-insulating filling portion, the heat-insulating filling portion of the peltier and the heat shield constituting a continuous heat-insulating system.
Preferably, the bottom of the heat shield is provided with a window, a heat conducting plate is arranged in the window, and the Peltier is arranged on one side of the heat conducting plate.
Preferably, the heat conductive material is a metal, a metal alloy or a metal insert having a thermal conductivity of 150W/m.K or more.
Further, still include the aviation camera dustcoat, the aviation camera dustcoat sets up temperature control device is peripheral, right the aviation camera protects and electromagnetic protection.
On the other hand, the invention also provides an aviation camera focal plane temperature control method, which comprises the following steps:
s1, detecting the temperature of the focal plane assembly by a temperature sensor;
s2, reading the data of the temperature sensor by the temperature controller and judging whether the temperature exceeds the range of a preset threshold value or not;
s3, the temperature control device receives the instruction of the temperature controller and adjusts the temperature of the focal plane assembly according to the instruction output by the temperature controller:
if the temperature exceeds the upper limit of the preset threshold value, the temperature controller activates a relay for refrigeration, starts the Peltier refrigeration in the temperature control device, and simultaneously starts a fan;
if the temperature exceeds the lower limit of the preset threshold, the temperature controller activates a relay for heating, starts the Peltier heating in the temperature control device, and simultaneously starts a fan;
and if the temperature is within the preset threshold range, the temperature controller returns to the step of reading the data of the temperature sensor.
In a third aspect, the invention further provides an aerial camera, which comprises the temperature control system.
The invention has the beneficial effects that:
a) utilize two relays to control the current direction through the Peltier, realize heating or refrigeration to aerial camera focal plane subassembly, the problem that the unable work of focal plane subassembly and ambient temperature are too high or the aerial camera imaging performance that long-time work leads to descends when having solved low temperature, the device is simple reliable, and installation, maintenance are convenient.
b) The electromagnetic compatibility of the system is ensured by the design of the waveguide plate.
Drawings
FIG. 1 is a schematic view of an aerial camera assembly of the present invention;
FIG. 2 is a schematic structural diagram of a temperature control device according to the present invention;
FIG. 3 is a vertical cross-sectional view of the temperature control apparatus of the present invention;
FIG. 4 is a schematic diagram of a set of arrangements of the Peltier of the present invention;
FIG. 5 is a schematic diagram of another set of arrangements of the Peltier device of the present invention;
FIG. 6 is a schematic flow chart of the operation of the temperature control device of the present invention;
FIG. 7 is a Peltier control circuit diagram of the temperature control device of the present invention;
description of the drawings:
10. aerial camera component 1 and focal plane component
2. Temperature control device 3 and mounting flange
4. Aviation camera housing 5 and temperature sensor
6. Temperature controller 21, heat shield
211. Heat-conducting plate 22, connector
23. Heat shield edge portion 231, inner connection assembly
232. External connection assembly 24 and waveguide plate
241. Waveguide plate hole 25 and fan
26. Heat sink 27, Peltier
271. A first insulating heat-conducting plate 272 and a second insulating heat-conducting plate
273. Peltier semiconductor portion 274, and Peltier heat insulating filling portion
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
In order to overcome the influence of the environmental temperature and long-time work on an aerial camera focal plane assembly, the invention aims to create a control system and a control method for controlling the aerial camera focal plane temperature.
In the temperature control system, the real-time temperature of the focal plane component of the aerial camera is monitored through the temperature sensor, the temperature controller judges whether the temperature read by the temperature sensor exceeds a preset threshold value or not, and when the temperature data is higher than the upper limit of the preset threshold value, the temperature controller activates the refrigerating solid-state relay to start the Peltier refrigerating in the temperature control device; and when the temperature data is lower than the lower limit of the preset threshold, the temperature controller activates the heating solid-state relay to start the Peltier heating in the temperature control device. Thereby achieving control of the temperature of the focal plane assembly.
Fig. 1 is a schematic view of an aerial camera assembly 10 of the present invention, with a focal plane assembly 1 being the subject of temperature control. The temperature control devices 2 positioned at the two sides of the coke surface component 1 are used for regulating and controlling the temperature of the coke surface component 1. The temperature control device 2 is connected with the focal plane assembly 1 through a mounting flange 3. An aerial camera housing 4 is arranged at one end, far away from the mounting flange 3, of the temperature control device 2, and the aerial camera housing 4 is used for protecting an aerial camera. A temperature sensor 5 corresponding to the temperature control device 2 is arranged on the focal plane assembly 1 for measuring the focal plane assembly temperature. The temperature controller 6 controls the temperature control device 2 to heat or cool the focal plane assembly 1 according to data sensed by the temperature sensor 5. In fig. 1, an arrangement mode that the temperature controller 6 and the temperature control device 2 are arranged on the same side of the aerial camera housing 4 is shown, and the temperature controller 6 can also be arranged on the side of the aerial camera housing 4 far away from the temperature control device 2 or can be arranged at any position without interfering with other components. Fig. 1 shows an embodiment in which the temperature control devices 2 are two, but the number of the temperature control devices 2 may be adjusted according to actual needs, but at least one is needed.
Fig. 2 is a schematic structural diagram of a temperature control device 2 according to the present invention. Fig. 2a is a rear side view of the temperature control device 2 of the present invention. The back of the temperature control device 2 is connected with a mounting flange 3, and the mounting flange 3 is used for connecting the temperature control device 2 with the focal plane assembly 1 and simultaneously conducting heat between the temperature control device 2 and the focal plane assembly 1. The temperature control device 2 comprises a heat shield 21, and the heat shield 21 can limit heat exchange between heat dissipation elements inside the heat shield 21 and internal components of the aerial camera. The heat shield 21 has a connector 22 on one side of its outer surface, the connector 22 electrically connecting the heat shield internal components of the temperature control device 2 with the temperature control system. The heat shield 21 has an edge portion 23 with two types of connection sets, an inner connection set 231 for connection with the aerial camera housing and an outer connection set 232 for connection of the waveguide plate 24 (not shown in the figure). Fig. 2b is a front side view of the temperature control device 2 of the present invention. The waveguide plate 24 is fixed to the heat shield edge portion 23 by the outer connection member group 232, and the waveguide plate 24 can achieve electromagnetic compatibility of the system. Fig. 2c is a front side view of the temperature control device 2 with the waveguide plate removed. The heat shield 21 is provided with a fan 25 and a heat sink 26 in this order from the waveguide plate 24 side inward, and the fan 25 and the heat sink 26 are used for heat exchange between the temperature control device 2 and the external environment. It should be noted that the heat shield 21, the aerial camera housing 4 and the waveguide plate 24 are shown as being connected in one way, but the three can be connected in other ways, for example, the waveguide plate 24 can be integrally formed with the aerial camera housing 4 and then connected with the heat shield 21 by a connector or the like.
Fig. 3 is a vertical cross-sectional view of the temperature control device 2 according to the present invention. The heat shield 21 and the waveguide plate 24 form a surrounding cavity, one side of the cavity is connected with the mounting flange 3, and the other corresponding side of the cavity is connected with the aerial camera housing 4. A peltier 27 is arranged at the joint of the heat shield 21 and the mounting flange 3, the peltier 27 is controlled by the temperature controller 6 to heat or refrigerate, and heat is exchanged between the mounting flange 3 and the focal plane assembly 1, so that the temperature of the focal plane assembly 1 is controlled. When one end face of the peltier 27 regulates and controls the temperature of the focal plane assembly 1, the fan 25 and the heat sink 26 between the heat shield 21 and the waveguide plate 24 perform heat exchange between the other end face of the peltier 27 and the external environment through the waveguide plate holes 241 on the waveguide plate, so as to ensure that the temperature of the other end face of the peltier 27 is not too high or too low.
Fig. 4 is a schematic diagram of two connection modes of the peltier device 27 and the heat shield 21 according to the present invention. In fig. 4a, a hole is directly formed in the body of the heat shield 21, the semiconductor part 273 of the peltier 27 is embedded, and then the first insulating heat conduction plate 271 and the second insulating heat conduction plate 272 on both sides of the peltier are combined to form the peltier 27 together with the semiconductor part 273. It is of course also possible to make the peltier 27 part separately and then connect the heat insulating filler 274 of the peltier 27 to the heat shield 21 so that the heat insulating filler 274 and the heat insulating shield part together form a heat insulating system, as shown in fig. 4 b.
Fig. 5 shows another two connection modes of the peltier 27 and the heat shield 21 according to the present invention, in which the heat shield 21 has a window at a position corresponding to the peltier 27 and an embedded heat conducting plate 211, and the peltier is attached to one side of the heat conducting plate 211, either on the side of the heat conducting plate 211 close to the mounting flange 3 (fig. 5a) or on the side of the heat conducting plate 211 close to the heat sink (fig. 5 b). Fig. 5 illustrates the case where the heat conducting plate 211 and the heat shield 21 have different thicknesses and the peltier element is embedded in the groove, but of course, the heat conducting plate 211 may have the same thickness as or similar to the heat shield 21, and the mounting flange 3 or the heat sink 26 is provided with a groove corresponding to the peltier element 27, so as to accommodate the peltier element 27. The metal conductor end faces of the peltier 27 and the wire portions, which are arranged between the insulating heat-conducting plate and the semiconductor group, are omitted in fig. 4 and 5, and the wires, which are led out from one side of the peltier 27, can be arranged in a conventional manner. The two side end faces of the peltier 27 are respectively connected with the mounting flange 3, the radiating fins 26 or the heat conducting plate 211 through heat conducting resin so as to facilitate heat exchange.
The material selection of the above components needs to be selected according to the corresponding functions. For the mounting flange 3, the heat sink 26 and the heat conducting plate 211, it is necessary to select a metal material with good heat conducting performance, such as a high heat conducting coefficient metal material of aluminum, copper, silver and their alloys, or a metal mixture formed by a high heat conducting coefficient metal material by using an embedding process, and the high heat conducting coefficient material is a heat conducting material with a heat conducting coefficient of more than 150W/m · K. The material of the heat shield 4 is selected from heat-insulating polymers with good machinability, such as teflon, polystyrene, etc.
Fig. 6 is a flowchart of a control method of the temperature control device of the present invention. The temperature sensor 5 monitors the temperature of the focal plane assembly 1 in real time, the temperature controller 6 reads monitoring data of the temperature sensor 5 and compares the monitoring data with a preset threshold value, when the temperature data read by the temperature controller 6 is higher than the upper limit of the preset threshold value, the temperature controller activates a solid-state relay used for refrigerating the Peltier 27 in the temperature controller, the Peltier 27 in the temperature control device 2 is started to refrigerate, and meanwhile, a fan is started to radiate the hot end of the Peltier 27. When the temperature data read by the temperature controller 6 is lower than the lower limit of the preset threshold, the temperature controller activates a solid-state relay for heating the peltier 27 in the temperature controller, starts the peltier 27 in the temperature control device 2 to heat, and simultaneously starts a fan to perform heat exchange between the cold end of the peltier 27 and the external environment. If the temperature data read by the temperature controller 6 is within the preset temperature threshold, the temperature monitoring is continued to be returned. The above control method uses a solid-state relay, but other types of relays, such as an electromagnetic relay, may be used.
Fig. 7 is a peltier control circuit of the temperature control device of the present invention. The working steps of the temperature controller 6 for controlling the Peltier 27 to heat or refrigerate are as follows:
the solid-state relay K1 is used for controlling the heating of the Peltier 27: when the temperature controller reads that the temperature monitored by the temperature sensor is lower than a preset threshold value, the temperature controller controls a pin 1 of the solid-state relay K1 to be at a high level, the solid-state relay is turned on, a pin 3 outputs a voltage of +12V, the positive electrode of the Peltier connected with the pin is connected with the voltage of +12V, and the Peltier starts to heat; resistor R1 is used to limit current when the +12V voltage is on, at which time led V1 is illuminated, indicating that the peltier device is heating up.
The solid-state relay K2 is used for controlling the Peltier 27 to refrigerate: when the temperature controller reads that the temperature monitored by the temperature sensor is higher than a preset threshold value, the temperature controller controls a pin 1 of the solid-state relay K2 to be at a high level, the solid-state relay is turned on, a pin 3 outputs a voltage of-12V, the positive electrode of the Peltier connected with the pin is connected with the voltage of-12V, and the Peltier starts to refrigerate; resistor R2 is used to limit current when the-12V voltage is on, at which time led V2 is illuminated, indicating that the peltier device is cooling.
The above control method is performed for one peltier 27, and in the case of two or more temperature control devices 2, a plurality of peltier 27 may be processed in parallel, and the control circuit may control the plurality of peltier at the same time. It is of course also possible to equip each peltier element 27 with one of the above-mentioned control circuits, in which case each control circuit comprises one temperature sensor, two solid-state relays, two resistors, two light-emitting diodes and one peltier element, respectively, and functions in full accordance with the above-mentioned control circuit. The control circuit in the above embodiment uses a 12V solid state relay, although other voltages and other types of relays may be used.
Aiming at a complex and changeable aviation environment, the invention designs a temperature control system using a Peltier, realizes heating or refrigeration of an aviation camera focal plane assembly by changing the current direction passing through the Peltier, solves the problems that the focal plane assembly cannot work at a low temperature and the imaging performance of the aviation camera is reduced due to overhigh environmental temperature or long-time work, and has the advantages of simple and reliable device and convenient installation and maintenance. In addition, the temperature control system provided by the invention ensures high reliability, stability and electromagnetic compatibility by selecting proper materials, electronic components and mechanical structures, can meet the thermal, force and electromagnetic requirements of vibration, impact, high and low temperature, electromagnetic compatibility, reliability and the like specified by the national military standard 150, and can be widely applied to the fields of aviation, aerospace and the like with higher requirements on stability.
In the description of the present invention, unless otherwise specified or limited, the term "connected" may be, for example, mechanically or electrically connected, or may be communication between two elements, or may be directly connected or indirectly connected through an intermediate, and the specific meaning of the term may be understood by those skilled in the art according to specific situations. The present invention is directed to an apparatus and method for producing a display device, which is capable of displaying a plurality of images, and which is capable of displaying a plurality of images on a display device.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It should be understood that although the present invention has been described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art will recognize that the embodiments described herein may be combined as a whole to form other embodiments as would be understood by those skilled in the art. The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A focal plane temperature control system of an aerial camera is characterized by comprising a temperature sensor, a temperature controller, at least one temperature control device and a mounting flange;
the temperature sensor is arranged on the focal plane assembly, and measures the current temperature of the focal plane assembly;
the temperature controller reads the temperature of the temperature sensor and outputs an instruction to the temperature control device according to the temperature;
the temperature control device is connected with the focal plane assembly through the mounting flange, and the temperature control device adjusts the temperature of the focal plane assembly according to an instruction output by the temperature controller;
the mounting flange is made of heat conducting materials, and the temperature adjustment of the focal plane assembly is realized through heat energy conduction of the mounting flange;
the temperature control device comprises a heat shield, a containing cavity formed by the waveguide plate in a surrounding mode, and a Peltier, a cooling fin and a fan which are sequentially arranged from the bottom of the heat shield to the waveguide plate.
2. The system of claim 1, wherein when the number of the temperature control devices is two or more, the temperature control devices are connected in parallel to each other and operate simultaneously, and the temperature controller comprises a first relay and a second relay, the first relay is used for driving the temperature control devices connected in parallel to each other to heat, and the second relay is used for driving the temperature control devices connected in parallel to each other to cool.
3. The aerial camera focal plane temperature control system of claim 1, wherein when the number of the temperature control devices is more than two, each temperature control device works independently, and the temperature controller is provided with a first relay and a second relay for each temperature control device, wherein the first relay is used for driving the temperature control devices to heat, and the second relay is used for driving the temperature control devices to cool.
4. The aerial camera focal plane temperature control system of claim 1, wherein the peltier includes a first thermally-insulated conductive plate, a second thermally-insulated conductive plate, a semiconductor portion, and a thermally-insulating fill portion, the thermally-insulating fill portion of the peltier and the heat shield forming a continuous thermal insulation system.
5. The aerial camera focal plane temperature control system of claim 1, wherein the bottom of the heat shield is provided with a fenestration in which a heat conducting plate is disposed, the peltier being disposed on one side of the heat conducting plate.
6. The aerial camera focal plane temperature control system of claim 1, wherein the mounting flange is made of a thermally conductive material that is a metal, metal alloy, or metal insert having a thermal conductivity of 150W/m-K or greater.
7. The aerial camera focal plane temperature control system of claim 1, further comprising an aerial camera housing disposed about the temperature control device to protect and electromagnetically shield the aerial camera.
8. The method for controlling the focal plane temperature of the aerial camera is characterized by comprising the following steps of:
s1, detecting the temperature of the focal plane assembly by a temperature sensor;
s2, the temperature controller reads the data of the temperature sensor, judges whether the temperature exceeds the range of the preset threshold value and sends an instruction to the temperature control device;
s3, the temperature control device receives the instruction of the temperature controller and adjusts the temperature of the focal plane assembly according to the instruction output by the temperature controller; the temperature control device comprises a heat shield, an accommodating cavity formed by the surrounding of a waveguide plate, and a Peltier, a cooling fin and a fan which are sequentially arranged from the bottom of the heat shield to the waveguide plate;
if the temperature exceeds the upper limit of the preset threshold value, the temperature controller activates a relay for refrigeration, starts the Peltier refrigeration in the temperature control device, and simultaneously starts a fan;
if the temperature exceeds the lower limit of the preset threshold, the temperature controller activates a relay for heating, starts the Peltier heating in the temperature control device, and simultaneously starts a fan;
and if the temperature is within the preset threshold range, the temperature controller returns to the step of reading the data of the temperature sensor.
9. An aerial camera characterized in that it comprises a temperature control system as claimed in any one of claims 1 to 7.
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| CN111796474A (en) * | 2020-06-02 | 2020-10-20 | 中国科学院西安光学精密机械研究所 | Thermoelectric refrigeration focal plane device for space astronomical camera |
| CN114895512B (en) * | 2022-06-09 | 2023-08-15 | 中国科学院长春光学精密机械与物理研究所 | Industrial camera conformal active and passive mixed cooling heat dissipation rear cover |
| CN115328230B (en) * | 2022-08-26 | 2023-07-21 | 中国科学院长春光学精密机械与物理研究所 | Photoelectric pod thermal control system and thermal control method thereof |
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