CN203719811U - Weak voltage signal detection device of micro-voltage sensor - Google Patents
Weak voltage signal detection device of micro-voltage sensor Download PDFInfo
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- CN203719811U CN203719811U CN201420019490.5U CN201420019490U CN203719811U CN 203719811 U CN203719811 U CN 203719811U CN 201420019490 U CN201420019490 U CN 201420019490U CN 203719811 U CN203719811 U CN 203719811U
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Abstract
The utility model discloses a weak voltage signal detection device of a micro-voltage sensor. The device comprises a micro-voltage sensor array, a multiplex switch, a signal conditioning circuit, a control circuit, a temperature sensor, an optical coupled isolator and a direct current power supply, wherein the micro-voltage sensor array, the multiplex switch, the signal conditioning circuit and the control circuit are successively connected. The temperature sensor is connected to the control circuit. The direct current power supply provides power for the signal conditioning circuit via the optical coupled isolator. The direct current power supply provides power for the control circuit. According to the device of the utility model, an array-type multi-point average measurement mode is used; a measurement error brought by a defect of the sensor itself is effectively eliminated and a random error or a repeatability error generated because of creep deformation of a sensor chip is reduced; an influence of null shift is greatly decreased.
Description
Technical field
The utility model belongs to Detection of Weak Signals field, particularly micro-pressure sensor weak voltage signals pick-up unit.
Background technology
The voltage signal producing in view of sensor is the important parameter of perception simulated world, therefore need to measure the output signal of sensor.As everyone knows, the measurement of minute-pressure meteorological, Aero-Space and medical aspect have very important application, so accurate measurement and the extraction of micro-pressure sensor signal are had important practical significance.But for micro-pressure sensor, because ambient pressure is very little, the deformation of sensor response is relatively very little, so the output signal of pressure transducer is very faint, be easy to be subject to the interference of the factors such as outside noise, zero point drift, this has just proposed higher requirement to testing circuit.In other words, the weak voltage signals testing circuit that needs in this case high precision and high stability, only having possessed such testing circuit could measure accurately and extract the signal of micro-pressure sensor well, thereby just can show that the definite pressurized situation of micro-pressure sensor part is counter releases extraneous minute-pressure.On the one hand, the existing Weak Signal Detecting Circuit for high precision occasion is very complicated, cost is higher, be difficult to meet the actual requirement of using in enormous quantities, and relatively cheap testing circuit measuring accuracy is poor, stability is low, can not meet technical indicator.On the other hand, be all generally to adopt single micro-pressure sensor to carry out micro pressure measuring, due to certain some air pressure may alter a great deal and dispatch from the factory parameter etc. of sensor slightly variant, these factors have all increased measuring error.
Utility model content
The technical matters existing in order to solve above-mentioned background technology, the utility model aims to provide micro-pressure sensor weak voltage signals pick-up unit, adopt array multi-point average metering system, effectively eliminated the measuring error of bringing due to the individual defect of sensor own and reduced stochastic error or the reproducibility error producing due to sensor chip creep, significantly having reduced the impact of drift.
In order to realize above-mentioned technical purpose, the technical solution of the utility model is:
Micro-pressure sensor weak voltage signals pick-up unit, comprise the micro-pressure sensor array, multiplexer switch, signal conditioning circuit and the control circuit that connect successively, also comprise temperature sensor, optical coupling isolator and direct supply, temperature sensor connects control circuit, direct supply is signal conditioning circuit power supply through optical coupling isolator, and direct supply is also control circuit power supply.
Wherein, above-mentioned micro-pressure sensor array consists of the micro gas pressure sensor NPC1210 of 3*3.
Wherein, above-mentioned signal conditioning circuit comprises pre-amplification circuit, bandpass filter, intergrade amplifying circuit, low-pass filter and the isolated amplifier connecting successively.
Wherein, above-mentioned control circuit comprises AD converter, stabilized voltage supply isolator, signal isolator, single-chip microcomputer, LDO linear power supply and LCD, the input end of described AD converter connects signal conditioning circuit, the output terminal of AD converter is connected with single-chip microcomputer through signal isolator, single-chip microcomputer connects LCD, the input end of LDO linear power supply connects direct supply, the output terminal of LDO linear power supply connects single-chip microcomputer, and the output terminal of LDO linear power supply is also connected with the output terminal of AD converter through stabilized voltage supply isolator.
Wherein, said temperature sensor is connected with single-chip microcomputer, and temperature sensor adopts DS18B20 digital temperature sensor.
Wherein, above-mentioned AD converter adopts AD7190.
Wherein, above-mentioned stabilized voltage supply isolator and signal isolator all adopt ADuM5401 digital isolator.
Wherein, above-mentioned single-chip microcomputer adopts STM32F013ZET6.
The beneficial effect that adopts technique scheme to bring is:
The micro-pressure sensor weak voltage signals pick-up unit the utility model proposes, can effectively measure small pressure, add and adopt restricting the number modulate circuit, array multi-point average metering system and temperature compensation algorithm, significantly suppress noise and temperature drift, reduced the reproducibility error that the change of properties such as creep of sensor itself are brought, reached the effect of high-acruracy survey.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present utility model.
Fig. 2 is micro-pressure sensor array of the present utility model and multiplexer switch structural representation.
Embodiment
Below with reference to accompanying drawing, the technical solution of the utility model is elaborated.
System architecture schematic diagram of the present utility model as shown in Figure 1, micro-pressure sensor weak voltage signals pick-up unit, comprise the micro-pressure sensor array, multiplexer switch, signal conditioning circuit and the control circuit that connect successively, also comprise temperature sensor, optical coupling isolator and direct supply, temperature sensor connects control circuit, direct supply is signal conditioning circuit power supply through optical coupling isolator, and direct supply is also control circuit power supply.
In the present embodiment, micro-pressure sensor array consists of the micro gas pressure sensor NPC1210 of 3*3.Micro gas pressure sensor NPC1210 detects micro-pressure signal, and is converted to electric signal output.Micro-pressure sensor array of the present utility model and multiplexer switch structural representation as shown in Figure 2, consider measuring accuracy, stochastic error, systematic error and noise error, therefore adopts sensor array formula to measure, and multi-group data is carried out to optimum solution.To each sensor, to carry out the collection of data, therefore adopt multiplexer switch, by single-chip microcomputer, be selected the break-make of each passage of multiplexer switch.
In the present embodiment, signal conditioning circuit comprises pre-amplification circuit, bandpass filter, intergrade amplifying circuit, low-pass filter and the isolated amplifier connecting successively.Signal conditioning circuit is the conditionings such as the electric signal that micro-pressure sensor is exported amplifies, filtering.
In the present embodiment, control circuit comprises AD converter, stabilized voltage supply isolator, signal isolator, single-chip microcomputer, LDO linear power supply and LCD, the input end of described AD converter connects signal conditioning circuit, the output terminal of AD converter is connected with single-chip microcomputer through signal isolator, single-chip microcomputer connects LCD, the input end of LDO linear power supply connects direct supply, the output terminal of LDO linear power supply connects single-chip microcomputer, and the output terminal of LDO linear power supply is also connected with the output terminal of AD converter through stabilized voltage supply isolator.Temperature sensor is connected with single-chip microcomputer, and temperature sensor adopts DS18B20 digital temperature sensor.AD converter adopts AD7190.Stabilized voltage supply isolator and signal isolator all adopt ADuM5401 digital isolator.Single-chip microcomputer adopts STM32F013ZET6.AD7190 is converted to digital signal by the simulating signal of signal conditioning circuit output, and sends STM32F013ZET6 to, and STM32F013ZET6 sends the digital signal receiving to LCD and shows.The temperature data that STM32F013ZET6 gathers temperature sensor DS18B20 is processed, and utilizes temperature compensation algorithm that temperature is compensated the impact of minute-pressure data, suppresses temperature drift.
The single-chip microcomputer control program more than relating to and temperature compensation algorithm all belong to the known technology of this area, and the utility model does not relate to any improvement to software or method.
Above embodiment is only explanation technological thought of the present utility model; can not limit protection domain of the present utility model with this; every technological thought according to the utility model proposes, any change of doing on technical scheme basis, within all falling into the utility model protection domain.
Claims (8)
1. micro-pressure sensor weak voltage signals pick-up unit, it is characterized in that: comprise the micro-pressure sensor array, multiplexer switch, signal conditioning circuit and the control circuit that connect successively, also comprise temperature sensor, optical coupling isolator and direct supply, temperature sensor connects control circuit, direct supply is signal conditioning circuit power supply through optical coupling isolator, and direct supply is also control circuit power supply.
2. micro-pressure sensor weak voltage signals pick-up unit according to claim 1, is characterized in that: described micro-pressure sensor array consists of the micro gas pressure sensor NPC1210 of 3*3.
3. micro-pressure sensor weak voltage signals pick-up unit according to claim 1, is characterized in that: described signal conditioning circuit comprises pre-amplification circuit, bandpass filter, intergrade amplifying circuit, low-pass filter and the isolated amplifier connecting successively.
4. micro-pressure sensor weak voltage signals pick-up unit according to claim 1, it is characterized in that: described control circuit comprises AD converter, stabilized voltage supply isolator, signal isolator, single-chip microcomputer, LDO linear power supply and LCD, the input end of described AD converter connects signal conditioning circuit, the output terminal of AD converter is connected with single-chip microcomputer through signal isolator, single-chip microcomputer connects LCD, the input end of LDO linear power supply connects direct supply, the output terminal of LDO linear power supply connects single-chip microcomputer, the output terminal of LDO linear power supply is also connected with the output terminal of AD converter through stabilized voltage supply isolator.
5. micro-pressure sensor weak voltage signals pick-up unit according to claim 4, is characterized in that: described temperature sensor is connected with single-chip microcomputer, and temperature sensor adopts DS18B20 digital temperature sensor.
6. micro-pressure sensor weak voltage signals pick-up unit according to claim 4, is characterized in that: described AD converter adopts AD7190.
7. micro-pressure sensor weak voltage signals pick-up unit according to claim 4, is characterized in that: described stabilized voltage supply isolator and signal isolator all adopt ADuM5401 digital isolator.
8. micro-pressure sensor weak voltage signals pick-up unit according to claim 4, is characterized in that: described single-chip microcomputer adopts STM32F013ZET6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420019490.5U CN203719811U (en) | 2014-01-14 | 2014-01-14 | Weak voltage signal detection device of micro-voltage sensor |
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| CN201420019490.5U CN203719811U (en) | 2014-01-14 | 2014-01-14 | Weak voltage signal detection device of micro-voltage sensor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467794A (en) * | 2014-12-25 | 2015-03-25 | 李钢 | Signal acquisition circuit |
| CN104614407A (en) * | 2015-02-05 | 2015-05-13 | 苏州慧闻纳米科技有限公司 | Gas monitoring system |
| CN104665834A (en) * | 2014-12-12 | 2015-06-03 | 天津大学 | Sleeping respiration signal acquiring device based on air bed |
| CN105157906A (en) * | 2015-08-28 | 2015-12-16 | 中国运载火箭技术研究院 | Aircraft high-speed flight process micro-pressure measuring device and measuring method |
| CN107393457A (en) * | 2016-05-16 | 2017-11-24 | 苹果公司 | Colored environment optical sensor circuit for electronic equipment |
| CN107968562A (en) * | 2017-12-25 | 2018-04-27 | 广州市熙泰自控设备有限公司 | A kind of intrinsic safety isolated form transmitter |
| CN108088573A (en) * | 2018-01-25 | 2018-05-29 | 福建海创光电有限公司 | A kind of APD noise suppressing methods and circuit |
| CN108234041A (en) * | 2018-01-17 | 2018-06-29 | 北京中科飞鸿科技有限公司 | A kind of receiver channel working state detecting method and device |
| CN108716913A (en) * | 2018-07-03 | 2018-10-30 | 深圳市中科金朗产业研究院有限公司 | A kind of angular velocity measurement device and motion control device |
| CN110567616A (en) * | 2019-08-29 | 2019-12-13 | 北京自动化控制设备研究所 | Signal acquisition circuit for silicon piezoresistive pressure sensor unit |
| CN110726617A (en) * | 2019-10-16 | 2020-01-24 | 南方科技大学 | High-throughput indentation creep testing device for gradient material |
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2014
- 2014-01-14 CN CN201420019490.5U patent/CN203719811U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104665834A (en) * | 2014-12-12 | 2015-06-03 | 天津大学 | Sleeping respiration signal acquiring device based on air bed |
| CN104467794A (en) * | 2014-12-25 | 2015-03-25 | 李钢 | Signal acquisition circuit |
| CN104467794B (en) * | 2014-12-25 | 2017-10-24 | 李钢 | Signal acquisition circuit |
| CN104614407A (en) * | 2015-02-05 | 2015-05-13 | 苏州慧闻纳米科技有限公司 | Gas monitoring system |
| CN105157906A (en) * | 2015-08-28 | 2015-12-16 | 中国运载火箭技术研究院 | Aircraft high-speed flight process micro-pressure measuring device and measuring method |
| CN105157906B (en) * | 2015-08-28 | 2017-09-29 | 中国运载火箭技术研究院 | Minute-pressure force measuring device and measuring method during a kind of aircraft high-speed flight |
| CN107393457A (en) * | 2016-05-16 | 2017-11-24 | 苹果公司 | Colored environment optical sensor circuit for electronic equipment |
| CN107968562A (en) * | 2017-12-25 | 2018-04-27 | 广州市熙泰自控设备有限公司 | A kind of intrinsic safety isolated form transmitter |
| CN108234041A (en) * | 2018-01-17 | 2018-06-29 | 北京中科飞鸿科技有限公司 | A kind of receiver channel working state detecting method and device |
| CN108234041B (en) * | 2018-01-17 | 2021-08-06 | 北京中科飞鸿科技有限公司 | Receiver channel working state detection method and device |
| CN108088573A (en) * | 2018-01-25 | 2018-05-29 | 福建海创光电有限公司 | A kind of APD noise suppressing methods and circuit |
| CN108716913A (en) * | 2018-07-03 | 2018-10-30 | 深圳市中科金朗产业研究院有限公司 | A kind of angular velocity measurement device and motion control device |
| CN110567616A (en) * | 2019-08-29 | 2019-12-13 | 北京自动化控制设备研究所 | Signal acquisition circuit for silicon piezoresistive pressure sensor unit |
| CN110726617A (en) * | 2019-10-16 | 2020-01-24 | 南方科技大学 | High-throughput indentation creep testing device for gradient material |
| CN110726617B (en) * | 2019-10-16 | 2022-06-28 | 南方科技大学 | High-throughput indentation creep testing device for gradient material |
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Granted publication date: 20140716 Termination date: 20160114 |