CN103869844A

CN103869844A - Constant-temperature control device for CCDs (charge coupled devices) of spaceflight optical remote sensor

Info

Publication number: CN103869844A
Application number: CN201410086308.2A
Authority: CN
Inventors: 鲁盼; 赵振明; 宋欣阳; 高娟
Original assignee: Beijing Institute of Space Research Mechanical and Electricity
Current assignee: Beijing Institute of Space Research Mechanical and Electricity
Priority date: 2014-03-10
Filing date: 2014-03-10
Publication date: 2014-06-18
Anticipated expiration: 2034-03-10
Also published as: CN103869844B

Abstract

The invention discloses a constant-temperature control device for CCDs (charge coupled devices) of a spaceflight optical remote sensor. The constant-temperature control device comprises a micro heat pipe, the CCDs, a thin-film electric heater, a switching plate, a conventional heat pipe, a heat dissipation plate and a control circuit, wherein when the CCDs are switched off, the control circuit controls the thin-film electric heater to heat the micro heat pipe; the micro heat pipe simultaneously transmits generated heat to the CCDs and the heat dissipation plate; the heat dissipation plate dissipates redundant heat, so that the temperature of the CCDs can be kept constant; at the moment when the CCDs are switched on, the control circuit controls the thin-film electric heater to be powered off instantly, and redundant heat generated by the CCDs is dissipated by the heat dissipation plate, so that the temperature of the CCDs can be kept constant. According to the constant-temperature control device for the CCDs, power compensation is performed close to the CCDs, so that temperature fluctuation caused by temperature control delay and CCD power change can be avoided; therefore the temperature stability of the CCDs can be improved.

Description

A kind of space flight optical remote sensor CCD device thermostatically-controlled equipment

Technical field

The invention belongs to space flight optical remote sensor thermal control technical field, relate to a kind of space flight optical remote sensor CCD device thermostatically-controlled equipment.

Background technology

CCD device (Charge Coupled Device) is as the critical component of aerospace optical remote sensing camera, and can the high quality of picture to(for) camera play vital effect.CCD device requires very strict to temperature stability, thereby the ability of conference increase dark current and thermonoise reduction opto-electronic conversion is crossed in temperature fluctuation, causes signal to noise ratio (S/N ratio) to reduce, and affects picture quality.In addition, because CCD device is directly installed on supporting construction, the rising of CCD device temperature can cause the supporting construction temperature contacting with it to raise, when CCD number of devices is more, linear array is when longer, the thermal deformation meeting of supporting construction causes focal plane subassembly overall dimensions that serious distortion occurs, this distortion varies with temperature and changes, and then the elements of interior orientation of high resolving power aerospace optical remote sensing camera is changed, and directly affects picture quality.Along with space optical remote camera resolution improves constantly, the power consumption of CCD device increases gradually, and quantity is on the increase, and linear array constantly increases.The dimensional stability of the focal plane subassembly that therefore will keep remote sensing camera in the time of work, key will improve the temperature stability of CCD device.In order to improve the temperature stability of CCD device, must carry out thermal design and heat control to it.Conventionally can adopt conventional temperature control method to suppress the temperature fluctuation of CCD device, conventional CCD device temperature control method is that temperature control instrument compares according to temperature value and the temperature control threshold value of temperature element feedback in the time of camera standby, when temperature is prescribed a time limit lower than the lower of temperature control threshold value, the energising of temperature control heating circuit, when temperature is during higher than temperature control upper threshold, the power-off of temperature control heating circuit, when between the upper limit of temperature in temperature control threshold value, lower limit, by the switching electricity time of temperature control algorithm control heating circuit, CCD device is remained in temperature control threshold range.When after camera start, CCD device produces powerful hear rate, and this part energy makes its temperature produce significant rising, when CCD device temperature is elevated to after the upper limit of temperature control threshold value, and the power-off of temperature control instrument control heating circuit.Due to scan period and the inner temperature control algorithm limits of temperature control instrument, make temperature control instrument not respond the temperature of CCD device immediately and rapidly the switching of heating circuit to be controlled, will cause camera start shooting be elevated to temperature control threshold value to CCD device temperature the upper limit during this period of time, heating circuit continuous heating, the accumulation of this part heat causes the temperature of CCD device further to rise.When after camera shutdown, CCD device temperature stops rising, and declines gradually, drops to after the upper limit of temperature control threshold value, and heating circuit starts temperature control.Temperature when conventional temperature control method makes the standby of CCD device is in a certain temperature levels, and when after the start of CCD device, CCD temperature rises until the rear temperature of CCD device shutdown declines gradually gradually at this temperature levels.Therefore in the time of CCD device open and close machine, because changing, heating power produced temperature fluctuation greatly.The method can not meet the thermostatic control requirement of CCD device.

Summary of the invention

The technical matters that the present invention solves is: overcome the deficiencies in the prior art, propose a kind of space flight optical remote sensor CCD device thermostatically-controlled equipment, solved high resolution space remote optical sensing camera CCD device because the variation of its heating power, the temperature control that temperature control instrument produces postpone the excessive problem of temperature fluctuation causing.

Technical scheme of the present invention is: a kind of space flight optical remote sensor CCD device thermostatically-controlled equipment, comprises micro heat pipe, CCD, film electroform heater, card extender, conventional heat pipe, heat sink and control circuit; Micro heat pipe sticks on CCD surface, and film electroform heater sticks on the outer wall of micro heat pipe; The cold junction of micro heat pipe is connected with the hot junction of conventional heat pipe by card extender; The cold junction of conventional heat pipe is fixedly connected with heat sink; When CCD shutdown, control circuit control film electroform heater heats micro heat pipe, and the heat of generation is passed to CCD and heat sink by micro heat pipe simultaneously, and heat sink is gone out unnecessary dissipation of heat, makes CCD keep temperature constant; CCD booting moment, control circuit control film electroform heater instant cut-off, the waste heat that CCD produces distributes by heat sink, makes CCD keep temperature constant.

Described card extender is large specific heat capacity hardware.

The present invention's advantage is compared with prior art: adopt apparatus of the present invention to avoid the temperature control bringing due to temperature control instrument scan period and control algolithm to postpone, this delay makes the following period of time of CCD device in start, temperature control heating circuit continuous heating, this part unnecessary heat causes the rising of CCD device temperature, has aggravated the temperature fluctuation of CCD device.The present invention uses control circuit according to the switching electricity of the mode of operation Instantaneous Control film electroform heater of CCD device, by the heating power of iteration of simulations calculative determination film electroform heater, make can keep for a long time constant heating power near CCD device, avoid because the heating power that CCD device open and close machine causes changes the temperature fluctuation bringing, and reach steady state (SS) by the temperature of conventional temperature control heating circuit control heat sink, to guarantee heat sink temperature stability in heat-transfer path, and then guarantee the temperature stabilization of CCD device.In the path of conducting heat, use specific heat capacity is large, thermal diffusion coefficient is high metal material and phase-changing energy storage material further to suppress the temperature fluctuation of heat-transfer path links.

Accompanying drawing explanation

Fig. 1 is apparatus of the present invention working mode figure;

Fig. 2 is apparatus of the present invention composition schematic diagram.

Embodiment

That the heat that the present invention uses is miniature, high-performance heat transfer components produces CCD device conducts to is rapidly heat sink, by camera switch machine telecommand control camera Management Controller, film electroform heater is carried out switching electricity and adopts some link of high specific heat capacity material, phase-changing energy storage material inhibition temperature fluctuation, heat-transfer path that conventional temperature control heating circuit is set further to strengthen with thermal accumlation, the heat-transfer path avoiding temperature control to postpone causing the temperature stability of heat-transfer path.Temperature stability by guaranteeing heat-transfer path each link is to realize the high stability temperature control of CCD device.

The mode of operation of the film electroform heater in the present invention as shown in Figure 1.In the time of camera standby, near film electroform heater CCD device with constant power powers up for a long time, and when camera booting moment, remote sensing camera sends instruction control camera Management Controller simultaneously film electroform heater is carried out to instant cut-off.The power of film electroform heater need to estimate according to formula (1), and wherein Q is that power, N are the number of CCD device.The detailed calculating of film electroform heater need to be considered the design that iterates of conduction heat between other objects and CCD device and radiations heat energy.

Q _{film electroform heater}=Q _{cCD device heating power}× N (1)

The installation site of film electroform heater as shown in Figure 2, comprises n sheet CCD, micro heat pipe 1, film electroform heater 2, aluminium alloy card extender 3, conventional heat pipe 4, heat sink 5 and control circuit; Miniature, large heat transfer capacity aluminium ammonia axial slot heat pipe is installed at the CCD back side, at another surperficial position sticking film electric heater 2 near CCD device of this heat pipe, the cold junction of this micro heat pipe sticks on card extender by heat-conducting silicon rubber, the hot junction of a conventional heat pipe 4 sticks on card extender by heat-conducting silicon rubber, and the cold junction of this routine heat pipe 4 sticks on heat sink by heat-conducting silicon rubber.The heating power of CCD device and film electroform heater need be arranged loose heat and all conduct to card extender 3 by this micro heat pipe 1, then are conducted to heat sink 5 and be finally radiated Leng Hei space, universe by a conventional heat pipe 4.In order further to improve the temperature stability of CCD device, in the path of heat conduction, use metal material and the phase-changing energy storage material that specific heat capacity is large, thermal diffusion coefficient is high, and some link in conducting path arranges conventional temperature control heating circuit and carries out high stability temperature control.

The content not being described in detail in instructions of the present invention belongs to those skilled in the art's known technology.

Claims

1. a space flight optical remote sensor CCD device thermostatically-controlled equipment, is characterized in that: comprise micro heat pipe (1), CCD, film electroform heater (2), card extender (3), conventional heat pipe (4), heat sink (5) and control circuit; Micro heat pipe (1) sticks on CCD surface, and film electroform heater (2) sticks on the outer wall of micro heat pipe (1); The cold junction of micro heat pipe (1) is connected with the hot junction of conventional heat pipe (4) by card extender (3); The cold junction of conventional heat pipe (4) is fixedly connected with heat sink (5); When CCD shutdown, control circuit control film electroform heater (2) heats micro heat pipe (1), the heat of generation is passed to CCD and heat sink (5) by micro heat pipe (1) simultaneously, and heat sink (5) is gone out unnecessary dissipation of heat, makes CCD keep temperature constant; CCD booting moment, control circuit control film electroform heater (2) instant cut-off, the waste heat that CCD produces distributes by heat sink (5), makes CCD keep temperature constant.

2. a kind of space flight optical remote sensor CCD device thermostatically-controlled equipment according to claim 1, is characterized in that: described card extender (3) is large specific heat capacity hardware.