CN2622700Y - Array signal regulating circuit of gas sensor - Google Patents
Array signal regulating circuit of gas sensor Download PDFInfo
- Publication number
- CN2622700Y CN2622700Y CNU032214227U CN03221422U CN2622700Y CN 2622700 Y CN2622700 Y CN 2622700Y CN U032214227 U CNU032214227 U CN U032214227U CN 03221422 U CN03221422 U CN 03221422U CN 2622700 Y CN2622700 Y CN 2622700Y
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- gas sensor
- signal
- operational amplifier
- circuit
- sensor
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Abstract
The utility model relates to a signal regulating circuit of a gas sensor in gas sensor arrays. The regulating circuit comprises a sensor signal program controlled amplifying circuit and a filter circuit. The signal regulating circuit of a gas sensor is characterized in that the amplifying circuit adopts a program controlled magnification device which is composed of a program controlled multi-way switch and an operational amplifier. For different sensor signals, the programmed switches are integrally controlled by the computer, and different channel modulated signal amplified multiples are selected. The high-frequency interference is prevented by increasing capacitance at the input and the output ends of the operational amplifier. The filter circuit is added at the output end of the operational amplifier for filtering for the signal so as to enhance the checking accuracy of the sensor.
Description
Affiliated technical field
The utility model relates to a kind of gas sensor signal treatment circuit, refers in particular to a kind of gas sensor array signal conditioning circuit when using the array detection smell that a plurality of gas sensors form.
Background technology
At present, the majority of gas pick-up unit all is to adopt single gas sensor, and as alcohol odor detection gas, because single-sensor can only detect a certain gas usually, the sensing range of this pick-up unit is limited.Compare with single gas sensor, the gas sensor array device is because sensing range is wideer, and its sensitivity, reliability and repeatability all improves a lot, and therefore, the detected gas of using gases sensor array comes into one's own day by day.But, because the odorousness difference of different material objects volatilization, and different gas sensors is to the different signal differences that smell produced, and signal is generally all very faint, is carrying out all should nursing one's health (amplification and filtering etc.) before A/D conversion input computing machine is handled.Existing gas sensor signal treatment circuit can't be realized different according to signal magnitude that different sensors in the sensor array produces and function that nurse one's health simultaneously.
Summary of the invention
For overcoming the deficiencies in the prior art, the purpose of this utility model is exactly that a kind of gas sensor array signal conditioning circuit of nursing one's health according to the signal of different sensors in the gas sensor array will be provided.
The technical solution of the utility model is:
Modulate circuit is characterised in that the sensor signal programmable amplifying circuit that combine of employing by program control multi-way switch and operational amplifier.It can select different paths to come the conditioning signal enlargement factor by computing machine according to the size control programmed switch of signal to different sensor signals.
Add electric capacity at the operational amplifier input/output terminal and prevent high frequency interference, and add filtering circuit at the output terminal of operational amplifier signal is carried out filtering, to improve the sensor precision.
Advantage of the present utility model is that it can carry out program control amplification at the signals that gas sensor detected different in the sensor array, selects suitable enlargement factor and filtered version, reaches the purpose that improves the gas sensor accuracy of detection.Because when gas sensor detects the denseer or sensor of smell to institute's detection signal when relatively sensitiveer, output signal is relatively large, can select a path that enlargement factor is smaller by programmed switch, be unlikely to sensor signal and when carrying out the A/D conversion, produce the phenomenon of overflowing.And when the signal of sensor is fainter, can select a path that enlargement factor is bigger by programmed switch, be unlikely to owing to weak output signal detects phenomenon less than signal.Use filtering circuit can reduce the fluctuation of signal.
Description of drawings
Fig. 1 gas sensor array detects the theory diagram of smell
Fig. 2 is the embodiment of the utility model gas sensor modulate circuit (a tunnel).
Embodiment
As shown in Figure 1, the signal that sensor and scent molecule produce at first will be nursed one's health through modulate circuit, i.e. amplification, filtering etc. just can be carried out A/D conversion input computing machine.Computing machine is adjusted the enlargement factor of each sensor signal etc. according to the size of signal.
As shown in Figure 2, in the frame of broken lines gas sensor circuit, Sn is a n gas sensor, this sensor output signal is V
InU
1Be the OP-07 operational amplifier; U
2Be the program control multi-way switch of IC4051, draw angle 9,10,11 and connect the path selection information that computing machine sends respectively, according to the difference of DO3, DO2, DO1, the path difference that IC4051 connected.Table 1 has provided the relation of the signal on each path and the pin 9,10,11.
The program control multi-way switch of table 1 IC4051
| A | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
| B | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
| C | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| By the gating pin | X0 | X1 | X2 | X3 | X4 | X5 | X6 | X7 |
As after x0 is by gating, resistance R 15 (100 ohm) is access in path, and then the enlargement factor of entire circuit is:
Can be understood as this moment and output to data collecting card (being former state output) after the voltage signal that original gas sensor 1 is recorded is enlarged into a times of former rice.In like manner, can suitably choose the resistance value of each path, export after making gas sensor signal amplify certain multiple.Certainly, if output to the A/D data collecting card, because the applied signal voltage scope of general data capture card can for 0～10V or-5～+ 5V, therefore should notice when considering the enlargement factor of whole gas sensor modulate circuit that the relation of each via resistance that the utility model is taked and whole gas sensor modulate circuit enlargement factor is referring to table 2 with its restriction within limits.Like this, whole modulate circuit maximum output voltage is no more than 10V.
In order to prevent high frequency interference from signal end, can be to operational amplifier (U
1) input/output terminal adds capacitor C 7, and add the filtering circuit that is made of resistance R 20 and capacitor C 8 at the output terminal of operational amplifier.
Each gas sensor circuit is all used modulate circuit shown in Figure 2, and path is selected by the unified control of computing machine, and the sensing data that collects in the time of can realizing the employing different amplification compares, and in time adjusts, and selects only enlargement factor.V
OutOutput signal after the conditioning.
The relation of each via resistance of table 2 and gas sensor modulate circuit enlargement factor
Claims (3)
1. the gas sensor array signal conditioning circuit is characterized in that adopting the sensor signal programmable amplifying circuit that combines by program control multi-way switch and operational amplifier.
2. gas sensor array signal conditioning circuit according to claim 1 is characterized in that adding electric capacity and prevents high frequency interference between the operational amplifier input/output terminal.
3. gas sensor array signal conditioning circuit according to claim 1 is characterized in that output terminal at operational amplifier adds filtering circuit signal is carried out filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032214227U CN2622700Y (en) | 2003-04-25 | 2003-04-25 | Array signal regulating circuit of gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032214227U CN2622700Y (en) | 2003-04-25 | 2003-04-25 | Array signal regulating circuit of gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2622700Y true CN2622700Y (en) | 2004-06-30 |
Family
ID=34244639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032214227U Expired - Fee Related CN2622700Y (en) | 2003-04-25 | 2003-04-25 | Array signal regulating circuit of gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2622700Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313824C (en) * | 2004-09-17 | 2007-05-02 | 中国地质大学（北京） | Portable gas hydrocarbon detector |
| CN102680651A (en) * | 2012-05-28 | 2012-09-19 | 中国矿业大学 | System and method for monitoring and acquisition of CO2 in vertical space |
| CN104483353A (en) * | 2014-12-16 | 2015-04-01 | 昆山圣赛诺尔传感技术有限公司 | Multichannel oxygen sensor testing device and multichannel oxygen sensor testing method |
| CN104614407A (en) * | 2015-02-05 | 2015-05-13 | 苏州慧闻纳米科技有限公司 | Gas monitoring system |
| CN105181752A (en) * | 2015-09-30 | 2015-12-23 | 浙江大学 | Multi-layer electrochemical gas sensing monitoring device |
| CN106990069A (en) * | 2017-05-05 | 2017-07-28 | 江苏三恒科技股份有限公司 | Laser methane detection means and method based on FPGA monochromatic lights road signal compensation |
| CN108369200A (en) * | 2015-12-16 | 2018-08-03 | 松下知识产权经营株式会社 | Gas sensor and gas sensing system |
-
2003
- 2003-04-25 CN CNU032214227U patent/CN2622700Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313824C (en) * | 2004-09-17 | 2007-05-02 | 中国地质大学（北京） | Portable gas hydrocarbon detector |
| CN102680651A (en) * | 2012-05-28 | 2012-09-19 | 中国矿业大学 | System and method for monitoring and acquisition of CO2 in vertical space |
| CN102680651B (en) * | 2012-05-28 | 2016-01-20 | 中国矿业大学 | A kind of vertical space CO 2monitoring and acquisition system and method |
| CN104483353A (en) * | 2014-12-16 | 2015-04-01 | 昆山圣赛诺尔传感技术有限公司 | Multichannel oxygen sensor testing device and multichannel oxygen sensor testing method |
| CN104614407A (en) * | 2015-02-05 | 2015-05-13 | 苏州慧闻纳米科技有限公司 | Gas monitoring system |
| CN105181752A (en) * | 2015-09-30 | 2015-12-23 | 浙江大学 | Multi-layer electrochemical gas sensing monitoring device |
| CN108369200A (en) * | 2015-12-16 | 2018-08-03 | 松下知识产权经营株式会社 | Gas sensor and gas sensing system |
| CN108369200B (en) * | 2015-12-16 | 2020-10-27 | 松下知识产权经营株式会社 | Gas sensor and gas sensing system |
| CN106990069A (en) * | 2017-05-05 | 2017-07-28 | 江苏三恒科技股份有限公司 | Laser methane detection means and method based on FPGA monochromatic lights road signal compensation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |