CN202929500U - Accelerometer and its temperature control circuit - Google Patents
Accelerometer and its temperature control circuit Download PDFInfo
- Publication number
- CN202929500U CN202929500U CN 201220319934 CN201220319934U CN202929500U CN 202929500 U CN202929500 U CN 202929500U CN 201220319934 CN201220319934 CN 201220319934 CN 201220319934 U CN201220319934 U CN 201220319934U CN 202929500 U CN202929500 U CN 202929500U
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- accelerometer
- control circuit
- temperature control
- heating element
- triode
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Abstract
A temperature control circuit used in an accelerometer comprises a bridge module, a correction module and an amplifier drive module, wherein the bridge module comprises a temperature sensor which is used for measuring operating ambient temperature change of the accelerometer and converting to output voltage change of the bridge; the correction module comprises an operational amplifier, two input ends of which are respectively connected with two-channel outputs of the bridge; and the amplifier drive module comprises a triode and a heating element. A base electrode of the triode is connected with an output end of the operational amplifier, and a collector electrode passes through the heating element and is then connected with a power source. The heating element is installed on the accelerometer. In comparison with the prior art, precision of the temperature control circuit is significantly raised. In addition, the temperature control circuit has characteristics of simple structure, high reliability and good stability, and use universality of the accelerometer is enhanced.
Description
Technical field
The utility model relates to a kind of device for acceleration measurement, is specifically related to a kind of quartz flexible accelerometer and temperature control circuit thereof that is applied to the space microgravity environment.
Background technology
Quartz flexible accelerometer is as the important devices of inertia measurement, has the precision height, long-time stability are good, are fit to the advantage of space microgravity acceleration analysis.As, requiring quartz flexible accelerometer resolution in space microgravity is measured is 5 μ g.Under this environment, the variation of the environmental loads such as temperature, vibration and magnetic field all can affect the output accuracy of accelerometer, wherein is subjected to the restriction of quartz flexible accelerometer temperature coefficient, is generally 20 μ g/ ℃, and the impact of temperature is particularly important.
In known accelerometer temperature control circuit, because it is lower that measuring accuracy requires, what generally adopt is to control accelerometer mounting tool temperature or control whole inertial measurement system, its defective is: because the inner structure of frock or measuring system is complicated, it is complicated to cause heating element to be installed, thermal field distributes and requires height, and affected greatly by variation of ambient temperature, when being generally environment temperature and in 0 ℃～50 ℃ scopes, changing, single-stage temperature control circuit temperature control precision is about ± 1 ℃, and multistage temperature control circuit is owing to added heat power consumption, the restrictions such as size are not suitable for being applied in the space environment of limited energy; Simultaneously, known temperature control circuit adopts frequency modulation or amplitude adjustment control more, sort circuit is not only complicated, and because the control drive part is switch working state, easily to accelerometer and the extraneous electromagnetic interference (EMI) that produces, cause the full accuracy of quartz flexible accelerometer output more than 100 μ g, be not suitable for being applied to the high microgravity survey occasion of accuracy requirement.
The utility model content
The purpose of this utility model is the defective for prior art, directly quartz flexible accelerometer is carried out temperature control, provide a kind of simple in structure, externally noiseless, temperature-controlled precision is high, good stability, and is fit to the circuit of direct-flow temperature control that each model accelerometer directly uses.
For realizing the purpose of this utility model, a kind of temperature control circuit for accelerometer comprises electric bridge module, correction module and amplification driver module, wherein, described electric bridge module comprises temperature sensor, and described temperature sensor is used for the operating ambient temperature variation of acceleration measurement meter and is converted to the variation of described electric bridge module output voltage; Described correction module comprises operational amplifier, and two input ends of described operational amplifier are connected with the two-way output of electric bridge module respectively; Described amplification driver module comprises triode and heating element, and the base stage of described triode is connected with the output terminal of described operational amplifier, collector is connected with power supply through behind the heating element, and described heating element is installed on the described accelerometer.
Further, described amplification driver module can also comprise the triode of 3 grades of parallel connections, and three collectors of described triode in parallel are connected with power supply through behind the heating element jointly.
Wherein, a gain resistor can be set between the output terminal of described operational amplifier and the input end.
The principle of work of above-mentioned temperature control circuit is: the conversion of route temperature sensor degree of the will speed up meter operating ambient temperature in the electric bridge module is converted to voltage signal, and the reference voltage on another road is delivered to two input ends of the operational amplifier in the correcting circuit in the electric bridge module, calibrated circuit is processed, signal after the processing exports the amplification driver module to carry out the linearity amplification and drives heating element accelerometer is heated, the operating ambient temperature of accelerometer is raise, finally feed back to the electric bridge module by the temperature sensor that is installed in the accelerometer, thereby the formation closed-loop control system guarantees accelerometer steady operation under various temperature environments.
The precision of above-mentioned temperature control circuit for accelerometer has had than prior art and has significantly improved, and to accelerometer without electromagnetic interference (EMI), guaranteed that accelerometer can measure small acceleration accurately.Wherein, amplify driver module and adopt multistage triode direct-coupling to connect, the electric current that both guaranteed to heat satisfies request for utilization under full temperature environment, has guaranteed that again input signal and output signal are remaining the linear relation of amplifying.Simultaneously, that above-mentioned temperature control circuit also has is simple in structure, reliability is high, the good stability characteristics, has strengthened the versatility that accelerometer uses.
Another purpose of the present utility model provides a kind of accelerometer that comprises above-mentioned temperature control circuit, and the temperature sensor in the described temperature control circuit and heating element are fixed on the described accelerometer, and described temperature sensor is positioned at accelerometer inside center position.
Further, described heating element directly sticks on the shell of accelerometer.
Above-mentioned accelerometer can directly stick on heating element on the shell of accelerometer owing to the circuit of direct-flow temperature control that has adopted the utility model to provide.Compare with accelerometer of the prior art, owing to need to not add outer cover in whole accelerometer outside heating element is encapsulated, the structure of accelerometer is simplified, and it is less that volume also becomes.
Description of drawings
Fig. 1 is the circuit diagram of one of most preferred embodiment of the utility model temperature control circuit of being used for accelerometer;
Fig. 2 (a) is the structural representation of one of most preferred embodiment of the accelerometer of temperature control circuit among use Fig. 1;
Fig. 2 (b) is the upward view of Fig. 2 (a);
Fig. 3 (a) is the experiment results of the utility model in 0 ℃～50 ℃ scopes of environment temperature the time;
Fig. 3 (b) is the temperature control precision of the utility model under isoperibol.
Embodiment
Below describe the temperature control circuit that the utility model is used for accelerometer in detail by a specific embodiment.
As shown in Figure 1, the temperature control circuit for accelerometer comprises electric bridge module, correction module and amplification driver module.Wherein, the electric bridge module comprises precision resistance R1, R2, R3, R4, R5, R6, temperature sensor AD 590 and high-precision voltage reference D1; Correction module comprises operational amplifier U1 (model is 7FOP07), resistance R 7, R8, R9, R10 and capacitor C 2, C3, the C4 of low maladjustment voltage; Amplify driver module and comprise triode Q1, Q2, Q3, resistance R 11, R12, R13 and capacitor C 5.Wherein, the operational amplifier U1 of low maladjustment voltage can guarantee signal behind the differential amplification and the consistance of temperature signal.Wherein, road output reference voltage in the electric bridge module is connected with the positive input of budget amplifier U1; Another road of electric bridge module comprises temperature sensor AD59, is connected with the reverse input end of operational amplifier.7 pins of operational amplifier U1 connect positive supply, and through electric capacity connection circuit power supply ground, 4 pins connect negative supply, and through electric capacity connection circuit power supply ground, 2 pin contact resistance R7, R10, the contact of C2, the contact of resistance R 7 contact resistance R1 and temperature sensor, 3 pin contact resistance R8, the contact of R9, the contact of resistance R 8 contact resistance R4 and R5,6 pin connecting resistance R10, R11, the contact of C2, the base stage of resistance R 11 connecting triode Q1, the contact of diode D2 and capacitor C 5, and through diode D2 connection circuit power supply ground, triode Q1 emitter is through resistance R 12 connection circuit power supply ground, and triode Q2 emitter is through resistance R 13 connection circuit power supply ground, triode Q3 emitter connects the contact on heat power supply ground and circuit power ground, triode Q1, Q2, the collector of Q3 links together and connects power supply through heating element.
Principle of work of the present utility model is: the current signal of temperature sensor AD 590 output raises with temperature and becomes large, and variation relation is 1 μ A/ ℃.When quartz flexible accelerometer internal temperature during well below set temperature value, the reverse input end voltage of operational amplifier U1 is lower than positive input voltage, operational amplifier U1 exports high level, triode Q1, Q2, the Q3 saturation conduction of control drive part, heating element (being heating plate in the present embodiment) is the peak power heating, and ACTE raises.When ACTE is increased to when being lower than 0.5 ℃ of left and right sides of set temperature value, control drives triode Q1, Q2, Q3 withdraw from saturated step by step, enters linear amplification region, enters linear heated condition, heating current raises with temperature and diminishes gradually, and temperature rise rate reduces gradually.When ACTE surpassed set temperature value, the reverse input end voltage of operational amplifier U1 was higher than positive input voltage, and operational amplifier U1 exports negative voltage, and control drives triode and enters cut-off state, the heating plate stopped heating, and temperature begins to descend.Like this in certain environment temperature working range (0 ℃～50 ℃), this temperature control circuit just can be operated in linear zone and carry out the constant current heating, accelerometer is remained under the constant working temperature, eliminated the impact of ambient temperature variation on the acceleration measuring accuracy of measurement, and because the heating current of each temperature spot is constant in ambient temperature range, make temperature control circuit can not produce external electromagnetic interference (EMI).
In conjunction with Fig. 2 (a) and Fig. 2 (b), use in the accelerometer of above-mentioned temperature control circuit temperature sensor and the heating element in the temperature control circuit has been installed.Among the figure, temperature sensor 2 sticks on accelerometer 1 inside center position, and heating element 3 is selected the flexible heating plate of low electromagnetism, uses tackifier directly to stick on the accelerometer shell.In actual applications, accelerometer 1 will be installed on the system under test (SUT) by the flange (gable shown in the dotted line among Fig. 2 (b)) on its top.In the prior art, usually need to be on the outer mask of whole accelerometer 1 outer cover cylindraceous, to prevent heating element system and environment are exerted an influence.But in the utility model, a simple ring-type heat insulating element 4 only must be installed between system under test (SUT) and accelerometer get final product.Preferably, heat insulating element 4 should select coefficient of heat conductivity less than 0.3W/m ℃ heat-barrier material, and thickness is 5～10mm.
Shown in Fig. 3 (a), experiment results when the described accelerometer of above embodiment and temperature control circuit thereof are in 0 ℃～50 ℃ scopes of environment temperature, when adding heat power consumption and be 8W, environment temperature to the maximum and change in 0 ℃～50 ℃ scopes, described temperature control circuit can guarantee that the accelerometer working temperature changes in ± 0.2 ℃ of scope.Shown in Fig. 3 (b), the temperature control precision of this temperature control circuit under isoperibol is to change in ± 0.2 ℃ of scope equally.
Claims (7)
1. a temperature control circuit that is used for accelerometer is characterized in that, comprises electric bridge module, correction module and amplification driver module, wherein:
Comprise temperature sensor in the described electric bridge module, described temperature sensor is used for the operating ambient temperature variation of acceleration measurement meter and is converted to the variation of described electric bridge module output voltage;
Described correction module comprises operational amplifier, and two input ends of described operational amplifier are connected with the two-way output of electric bridge module respectively;
Described amplification driver module comprises triode and heating element, and the base stage of described triode is connected with the output terminal of described operational amplifier, collector is connected with power supply through behind the heating element, and described heating element is installed on the described accelerometer.
2. temperature control circuit according to claim 1 is characterized in that, described amplification driver module comprises the triode of 3 grades of parallel connections, and three collectors of described triode in parallel are connected with power supply through behind the heating element jointly.
3. temperature control circuit according to claim 1 is characterized in that, is provided with gain resistor between the output terminal of described operational amplifier and the input end.
4. an accelerometer that comprises the described temperature control circuit of claim 1 is characterized in that, the temperature sensor in the described temperature control circuit and heating element are fixed on the described accelerometer, and described temperature sensor is positioned at accelerometer inside center position.
5. accelerometer according to claim 4 is characterized in that, described heating element sticks on the shell of described accelerometer.
6. accelerometer according to claim 5 is characterized in that, described accelerometer is installed on the system under test (SUT) by the flange on its top, and between system under test (SUT) and the accelerometer ring-type heat insulating element is installed.
7. accelerometer according to claim 6 is characterized in that, described heat insulating element is coefficient of heat conductivity less than 0.3W/m ℃ heat-barrier material, and thickness is 5～10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220319934 CN202929500U (en) | 2012-07-04 | 2012-07-04 | Accelerometer and its temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220319934 CN202929500U (en) | 2012-07-04 | 2012-07-04 | Accelerometer and its temperature control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202929500U true CN202929500U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220319934 Expired - Lifetime CN202929500U (en) | 2012-07-04 | 2012-07-04 | Accelerometer and its temperature control circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771362A (en) * | 2016-12-29 | 2017-05-31 | 北京航天时代光电科技有限公司 | A kind of single shaft, integral type strapdown acceleration measurement device |
| CN108363430A (en) * | 2017-12-27 | 2018-08-03 | 北京航天时代光电科技有限公司 | A kind of temperature control device and its temperature control method of high-precision quartz accelerometer |
| CN108896272A (en) * | 2018-05-04 | 2018-11-27 | 中国海洋大学 | A kind of turbulence modulation method and measuring device |
| CN113310604A (en) * | 2021-04-23 | 2021-08-27 | 青岛东方船研深海装备结构技术有限公司 | Stress sensor installation auxiliary system and device |
| CN114384951A (en) * | 2021-12-14 | 2022-04-22 | 安徽皖仪科技股份有限公司 | Constant temperature system for conductivity detector and control method |
| CN114895074B (en) * | 2022-05-06 | 2024-05-17 | 西安中科智晶光电技术有限公司 | Correction method for vibration rectification error of quartz accelerometer |
-
2012
- 2012-07-04 CN CN 201220319934 patent/CN202929500U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771362A (en) * | 2016-12-29 | 2017-05-31 | 北京航天时代光电科技有限公司 | A kind of single shaft, integral type strapdown acceleration measurement device |
| CN108363430A (en) * | 2017-12-27 | 2018-08-03 | 北京航天时代光电科技有限公司 | A kind of temperature control device and its temperature control method of high-precision quartz accelerometer |
| CN108896272A (en) * | 2018-05-04 | 2018-11-27 | 中国海洋大学 | A kind of turbulence modulation method and measuring device |
| CN113310604A (en) * | 2021-04-23 | 2021-08-27 | 青岛东方船研深海装备结构技术有限公司 | Stress sensor installation auxiliary system and device |
| CN114384951A (en) * | 2021-12-14 | 2022-04-22 | 安徽皖仪科技股份有限公司 | Constant temperature system for conductivity detector and control method |
| CN114895074B (en) * | 2022-05-06 | 2024-05-17 | 西安中科智晶光电技术有限公司 | Correction method for vibration rectification error of quartz accelerometer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130508 |
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| CX01 | Expiry of patent term |