CN202710200U - Space remote sensing CCD camera high-precision CCD temperature measurement circuit - Google Patents
Space remote sensing CCD camera high-precision CCD temperature measurement circuit Download PDFInfo
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- CN202710200U CN202710200U CN 201220369454 CN201220369454U CN202710200U CN 202710200 U CN202710200 U CN 202710200U CN 201220369454 CN201220369454 CN 201220369454 CN 201220369454 U CN201220369454 U CN 201220369454U CN 202710200 U CN202710200 U CN 202710200U
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Abstract
The space remote sensing CCD camera high-precision CCD temperature measurement circuit is a part of a CCD camera circuit. The space remote sensing CCD camera high-precision CCD temperature measurement circuit comprises a temperature measurement bridge circuit, a difference operational amplification circuit, and an AD conversion circuit. After externally inputted temperature measurement signals of a CCD device internal temperature measurement resistor pass through the temperature measurement bridge circuit, the temperature measurement signals become stable difference voltage signals and are sent to the difference operational amplification circuit; after the difference operational amplification circuit carries out filtering amplification processing on the stable difference voltage signals, the stable difference voltage signals are outputted to the AD conversion circuit; and the AD conversion circuit carries out analog-to-digital conversion on the processed analog signals, and then corresponding temperature digital signals are obtained and are outputted. The space remote sensing CCD camera high-precision CCD temperature measurement circuit uses an integration technology, and can be flexibly embedded into a CCD imaging circuit, the temperature measurement bridge circuit in the circuit can effectively solve the common-mode interference in the signals, the high-precision AD converter improves the temperature measurement precision, the deficiency of the long transmission path of the temperature signals is overcome, and the high-precision real-time monitoring of the CCD temperature carried out by the space remote sensing CCD camera imaging circuit is realized.
Description
Technical field
The utility model relates to a kind of temperature measurement circuit, particularly a kind of high precision measuring temperature circuit that is applicable to space remote sensing CCD camera CCD device.
Background technology
Remote sensing CCD camera is when work; the temperature of CCD device can raise along with the increase of power-up time; the rising of device temperature not only makes the dark current noise of CCD increase; and then cause the deterioration of picture quality; and too high device temperature is can faster devices aging even damage CCD, and therefore the temperature at rail Real-Time Monitoring CCD all is very necessary for improving picture quality and protection CCD device.Remote sensing CCD camera is to rely on the CCD device surface to mount thermistor at the rail thermometric at present, obtains temperature measurement data by the thermal control instrument, passes to satellite platform again.This temperature sensing means has following weak point: 1) need huge equipment; 2) require thermistor accurately to install, otherwise have larger measuring error; 3) CCD device shell temperature can only be monitored, accurately CCD junction temperature can't be monitored; 4) because temperature measuring equipment and imaging device are two autonomous devices, so can't adjust in real time image correction parameters according to the temperature of CCD device; 5) because CCD thermistor radix is large, and-20 ℃ to 60 ℃ variation ranges are little, rate of change is less than 5%, so just need to obtain exactly the CCD temperature in very little dynamic range.
The utility model content
Technology of the present utility model is dealt with problems and is: overcome the deficiencies in the prior art, a kind of space remote sensing CCD camera high precision CCD temperature measurement circuit of energy Real-Time Monitoring CCD temperature is provided.
Technical solution of the present utility model is: space remote sensing CCD camera high precision CCD temperature measurement circuit comprises thermometric bridge circuit, difference operational amplifying circuit and A/D convertor circuit; The thermometric bridge circuit converts behind the corresponding voltage variety variable quantity of the inner temperature detecting resistance resistance of CCD to differential signal formal output to difference operational amplifying circuit, difference operational amplifying circuit carries out outputing to A/D convertor circuit after amplification filtering is processed to described differential signal, and A/D convertor circuit is exported after the analog signal conversion that transmits is become the temperature digital signal.
Described thermometric bridge circuit comprises original temperature measurement signal first input end, original temperature measurement signal the second input end, the first power supply, resistance R 21, resistance R 22, resistance R 23, the inner temperature detecting resistance of CCD two ends are respectively original temperature measurement signal first input end and original temperature measurement signal the second input end, temperature detecting resistance with after resistance R 21 is connected again with the series circuit that is formed by resistance R 22 and resistance R 23 electric bridge that forms in parallel, public termination first power supply of resistance R 21 and resistance R 22, the common end grounding of resistance R 23 and original temperature measurement signal the second input end, the common port of resistance R 22 and resistance R 23 is as the first output signal end; Under the first power supply effect, deliver to difference operational amplifying circuit at original temperature measurement signal first input end and the first output signal end generation voltage formation differential voltage signal.
The voltage of described the first power supply is+3.3V.
Described difference operational amplifying circuit comprises the first operational amplifier, the second operational amplifier, resistance R 24, resistance R 25, resistance R 26, resistance R 27 and capacitor C 29, one end ground connection of resistance R 24, an other end of resistance R 24 is connected to the negative input end of the first operational amplifier and an end of resistance R 25 simultaneously, resistance R 25 other ends are connected to the output terminal of the first operational amplifier, one of resistance R 26 is connected to the output terminal of the first operational amplifier, an other end of resistance R 26 is connected to the negative input end of the second operational amplifier and an end of resistance R 27 simultaneously, the other end of resistance R 27 is connected to the output terminal of the second operational amplifier and an end of capacitor C 29 simultaneously, the other end ground connection of capacitor C 29, resistance R 24, resistance R 25, resistance R 26, the resistance of resistance R 27 satisfies relation: R24/R25=R27/R26, as the input end of difference operational amplifying circuit, the output terminal of the second operational amplifier is as the output terminal of difference operational amplifying circuit respectively for the positive input terminal of the positive input terminal of the first operational amplifier and the second operational amplifier.
Described the first operational amplifier and the second operational amplifier are LM124.
Described A/D convertor circuit comprises AD converter and second source; Second source is AD converter power supply, the output signal of difference operational amplifying circuit through after the AD converter with the formal output of digital signal.
Described AD converter is RHF1401.
The voltage of described second source is+2.5V.
The utility model advantage compared with prior art is: the utility model circuit adopts integrated technology, use a small amount of integrated device, and the device package volume is little, power consumption is little, can be embedded into neatly in the CCD imaging circuit, improved the real-time of CCD thermometric, high-precision AD converter has also improved temperature measurement accuracy in addition, this circuit can replace existing independent temperature measuring equipment, reduced the temperature signal transmission path, carry out better closed-loop control, can provide support for CCD imaging circuit steady operation.Bridge-type temperature measurement circuit in this circuit can solve common mode interference in the signal effectively; The difference operational amplifying circuit of adjustable gain can be by regulating feedback resistance, and effectively amplified analog signal to adapt to better the AD converter input range, can solve the little problem of CCD temperature detecting resistance dynamic change scope, can monitor more delicately the variation of CCD temperature; High-precision AD converter can make temperature measurement accuracy can reach 14; This circuit can be finished the Real-Time Monitoring of CCD junction temperature, and according to the result of thermometric, for dark current correction provides reference, in order to take preventive measures ahead of time or shut down.
Description of drawings
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is the electric circuit constitute structural drawing of the present utility model;
Fig. 3 is the signal output waveform figure of each ingredient in the utility model.
Embodiment
As shown in Figure 1, the theory diagram for the utility model space remote sensing CCD camera high precision CCD temperature measurement circuit comprises thermometric bridge circuit, difference operational amplifying circuit and A/D convertor circuit.The course of work of the utility model circuit is: the thermometric bridge circuit converts behind the corresponding voltage variety variable quantity of the inner temperature detecting resistance resistance of CCD to differential signal formal output to difference operational amplifying circuit, difference operational amplifying circuit carries out outputing to A/D convertor circuit after amplification filtering is processed to described differential signal, and A/D convertor circuit is exported after the analog signal conversion that transmits is become the temperature digital signal.
As shown in Figure 2, form structural drawing for the utility model space remote sensing CCD high precision CCD temperature measurement circuit.The thermometric bridge circuit comprises original temperature measurement signal first input end 201, original temperature measurement signal the second input end 202, resistance R 21, resistance R 22, resistance R 23, the first power supplys 214; The thermometric bridge circuit is the input interface circuit of the utility model circuit, the inner temperature detecting resistance Rt of CCD connects with resistance R 21, circuit after connecting with resistance R 22 and resistance R 23 again is in parallel, after forming electric bridge, generation current on temperature detecting resistance Rt, under 214 effects of the first power supply, at original temperature measurement signal first input end 201, and the common port of resistance R 22 and resistance R 23, namely produce magnitude of voltage on the first output signal end 206, obtain the respective differentiated voltages signal, and respectively as the input signal of difference operational amplifying circuit.The resistance of thermometric bridge circuit, comprise resistance R 21, resistance R 22, resistance R 23, need to select according to the resistance Rt of CCD temperature detecting resistance, all need to be less than the rated current of resistance itself by electric current on the resistance, the magnitude of voltage at original temperature measurement signal first input end 201 and the first output signal end 206 places all needs to satisfy less than (VCC1-1.5V), and wherein VCC1 is the voltage of the first power supply 214.The signal waveform of the original temperature measurement signal first input end 201 of thermometric bridge circuit and the first output signal end 206 as shown in Figure 3, original temperature measurement signal first input end 201 is simulating signal, original temperature measurement signal the second input end 202 signals are ground connection all the time.
Difference operational amplifying circuit comprises the first operational amplifier 209, the second operational amplifier 211, resistance R 24, feedback resistance R25, resistance R 26, feedback resistance R27, the first power supply 214; The original temperature measurement signal first input end 201 of thermometric bridge circuit links to each other with the positive input terminal of the first operational amplifier 209, and the first output signal end 206 links to each other with the positive input terminal of the second operational amplifier 211.The output terminal of the first operational amplifier 209 is through resistance R 26, and the negative input end with operational amplifier 211 links to each other again.The pass that four resistance need to satisfy is: R24/R25=R27/R26, the output terminal of the second operational amplifier 211 are as the second output signal end 212, and its voltage magnitude is V
O-212, the voltage magnitude of original temperature measurement signal first input end 201 is V
201, the voltage magnitude of the first output signal end 206 is V
206, V so
O-212=(1+R27/R26) (V
206-V
201), carry out according to actual needs resistance adjustment, obtain the output signal that needs.The signal waveform of the second output signal end 212 of illustrating among Fig. 3 is simulating signal, this moment R27=R26, V
O-212=2 * (V
206-V
201).
A/D convertor circuit comprises AD converter 218 and second source 213; Second source is the AD converter power supply.Simulating signal is through after the AD converter 218, from the total output signal end 215 of the space remote sensing CCD high precision CCD temperature measurement circuit formal output with digital signal.
In the circuit shown in Figure 2, the first operational amplifier 209 and the second operational amplifier 211 are all selected LM124; AD converter 218 is selected RHF1401; The voltage VCC1 value of the first power supply is+3.3V that the voltage VCC2 value of second source is+2.5V.
The content that is not described in detail in the utility model instructions belongs to those skilled in the art's known technology.
Claims (8)
1. space remote sensing CCD camera high precision CCD temperature measurement circuit, it is characterized in that: comprise thermometric bridge circuit, difference operational amplifying circuit and A/D convertor circuit, the thermometric bridge circuit converts behind the corresponding voltage variety variable quantity of the inner temperature detecting resistance resistance of CCD to differential signal formal output to difference operational amplifying circuit, difference operational amplifying circuit carries out outputing to A/D convertor circuit after amplification filtering is processed to described differential signal, and A/D convertor circuit is exported after the analog signal conversion that transmits is become the temperature digital signal.
2. space remote sensing CCD camera high precision CCD temperature measurement circuit according to claim 1, it is characterized in that: described thermometric bridge circuit comprises original temperature measurement signal first input end (201), original temperature measurement signal the second input end (202), the first power supply (214), resistance R 21, resistance R 22, resistance R 23, the inner temperature detecting resistance of CCD two ends are respectively original temperature measurement signal first input end (201) and original temperature measurement signal the second input end (202), temperature detecting resistance with after resistance R 21 is connected again with the series circuit that is formed by resistance R 22 and resistance R 23 electric bridge that forms in parallel, public termination first power supply (214) of resistance R 21 and resistance R 22, the common end grounding of resistance R 23 and original temperature measurement signal the second input end (202), the common port of resistance R 22 and resistance R 23 is as the first output signal end (206); Under the first power supply (214) effect, deliver to difference operational amplifying circuit at original temperature measurement signal first input end (201) and the first output signal end (206) generation voltage formation differential voltage signal.
3. space remote sensing CCD camera high precision CCD temperature measurement circuit according to claim 2 is characterized in that: the voltage of described the first power supply (214) is+3.3V.
4. space remote sensing CCD camera high precision CCD temperature measurement circuit according to claim 1, it is characterized in that: described difference operational amplifying circuit comprises the first operational amplifier (209), the second operational amplifier (211), resistance R 24, resistance R 25, resistance R 26, resistance R 27 and capacitor C 29, one end ground connection of resistance R 24, an other end of resistance R 24 is connected to the negative input end of the first operational amplifier (209) and an end of resistance R 25 simultaneously, resistance R 25 other ends are connected to the output terminal of the first operational amplifier (209), one of resistance R 26 is connected to the output terminal of the first operational amplifier (209), an other end of resistance R 26 is connected to the negative input end of the second operational amplifier (211) and an end of resistance R 27 simultaneously, the other end of resistance R 27 is connected to the output terminal of the second operational amplifier (211) and an end of capacitor C 29 simultaneously, the other end ground connection of capacitor C 29, resistance R 24, resistance R 25, resistance R 26, the resistance of resistance R 27 satisfies relation: R24/R25=R27/R26, as the input end of difference operational amplifying circuit, the output terminal of the second operational amplifier (211) is as the output terminal of difference operational amplifying circuit respectively for the positive input terminal of the positive input terminal of the first operational amplifier (209) and the second operational amplifier (211).
5. space remote sensing CCD camera high precision CCD temperature measurement circuit according to claim 4, it is characterized in that: described the first operational amplifier (209) and the second operational amplifier (211) are LM124.
6. space remote sensing CCD camera high precision CCD temperature measurement circuit according to claim 1, it is characterized in that: described A/D convertor circuit comprises AD converter (218) and second source (213); Second source (213) is AD converter (218) power supply, and the output signal of difference operational amplifying circuit is through the rear formal output with digital signal of AD converter (218).
7. space remote sensing CCD camera high precision CCD temperature measurement circuit according to claim 6 is characterized in that: described AD converter (218) is RHF1401.
8. space remote sensing CCD camera high precision CCD temperature measurement circuit according to claim 6 is characterized in that: the voltage of described second source (213) is+2.5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220369454 CN202710200U (en) | 2012-07-27 | 2012-07-27 | Space remote sensing CCD camera high-precision CCD temperature measurement circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220369454 CN202710200U (en) | 2012-07-27 | 2012-07-27 | Space remote sensing CCD camera high-precision CCD temperature measurement circuit |
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| CN202710200U true CN202710200U (en) | 2013-01-30 |
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| CN 201220369454 Expired - Lifetime CN202710200U (en) | 2012-07-27 | 2012-07-27 | Space remote sensing CCD camera high-precision CCD temperature measurement circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412590A (en) * | 2013-08-08 | 2013-11-27 | 北京空间机电研究所 | Method of high-precision temperature control suitable for space remote sensing camera |
| CN103873785A (en) * | 2014-03-26 | 2014-06-18 | 中国科学院光电技术研究所 | Low-noise charge coupled device front-end analog video signal preprocessing device |
| CN103868499A (en) * | 2014-02-28 | 2014-06-18 | 北京空间机电研究所 | Intelligent optical remote sensing system |
| CN109781302A (en) * | 2019-02-26 | 2019-05-21 | 北京空间飞行器总体设计部 | A kind of loading temperature health control method for inertial space observation satellite |
| CN111001932A (en) * | 2019-11-11 | 2020-04-14 | 武汉一本光电有限公司 | Constant temperature welding laser controller |
-
2012
- 2012-07-27 CN CN 201220369454 patent/CN202710200U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412590A (en) * | 2013-08-08 | 2013-11-27 | 北京空间机电研究所 | Method of high-precision temperature control suitable for space remote sensing camera |
| CN103412590B (en) * | 2013-08-08 | 2015-05-27 | 北京空间机电研究所 | Method of high-precision temperature control suitable for space remote sensing camera |
| CN103868499A (en) * | 2014-02-28 | 2014-06-18 | 北京空间机电研究所 | Intelligent optical remote sensing system |
| CN103868499B (en) * | 2014-02-28 | 2015-12-09 | 北京空间机电研究所 | A kind of intelligent optical remote sensing system |
| CN103873785A (en) * | 2014-03-26 | 2014-06-18 | 中国科学院光电技术研究所 | Low-noise charge coupled device front-end analog video signal preprocessing device |
| CN103873785B (en) * | 2014-03-26 | 2017-08-11 | 中国科学院光电技术研究所 | Low-noise charge coupled device front-end analog video signal preprocessing device |
| CN109781302A (en) * | 2019-02-26 | 2019-05-21 | 北京空间飞行器总体设计部 | A kind of loading temperature health control method for inertial space observation satellite |
| CN111001932A (en) * | 2019-11-11 | 2020-04-14 | 武汉一本光电有限公司 | Constant temperature welding laser controller |
| CN111001932B (en) * | 2019-11-11 | 2021-07-09 | 武汉一本光电有限公司 | Constant temperature welding laser controller |
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| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20130130 |