CN102455280A - CO2 gas detection circuit based on infrared sensor - Google Patents
CO2 gas detection circuit based on infrared sensor Download PDFInfo
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- CN102455280A CN102455280A CN2010105121593A CN201010512159A CN102455280A CN 102455280 A CN102455280 A CN 102455280A CN 2010105121593 A CN2010105121593 A CN 2010105121593A CN 201010512159 A CN201010512159 A CN 201010512159A CN 102455280 A CN102455280 A CN 102455280A
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- circuit
- carbon dioxide
- detection circuit
- gas detection
- infrared
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Abstract
The invention relates to a CO2 gas detection circuit based on an infrared sensor. The invention relates to a carbon dioxide sensor, and provides a CO2 gas detection circuit with wide detection range, high sensitivity, fast response, good selectivity, and high interference resistance, wherein the CO2 gas detection circuit is based on an infrared sensor. The CO2 gas detection circuit provided by the invention comprises an infrared carbon dioxide sensor, a digital filter circuit, an amplifier circuit, a current stabilizing circuit, a single-chip computer system, and temperature compensation. Main structural points of the CO2 gas detection circuit are that: the infrared carbon dioxide sensor converts detected carbon dioxide gas concentrations into corresponding electrical signals; the outputted electrical signals are subject to filtering and amplifying, and are inputted into the single-chip computer system; treatments such as temperature and air pressure compensations are carried out; and the signals are transmitted to a displaying apparatus by the single-chip computer system, such that measured values can be displayed.
Description
Technical field:
The present invention relates to a kind of carbon dioxide sensor, relate in particular to a kind of CO based on infrared sensor
2Detection Circuit.
Background technology:
Progress and science and technology development along with human society; People's living standard has obtained rapid raising; Commercial production scale also enlarges rapidly, but has caused emission of carbon-dioxide to be doubled and redoubled simultaneously, like greenhouse effect; Desertification of land degree acceleration etc. have a strong impact on and are destroying existent environment of people.In addition, carbon dioxide is the primary raw material of crop photosynthesis effect, the whether suitable growth that directly influences crop of its content.In recent years; The enhancing of Along with people's environmental consciousness; The progress of scientific-technical progress, how the content of fast detecting carbon dioxide is cut down emission of carbon-dioxide; Become the problem of governments at all levels and numerous knowledgeable people's special concern, therefore research and design carbon dioxide testing circuit have crucial meaning.
The method that detects carbon dioxide at present mainly contains chemical method, electrochemical process, vapor-phase chromatography, volumetric precipitation method etc., and these method ubiquities expensive, problems such as universality difference, and measuring accuracy is also lower.But and sensor method has advantage such as safe and reliable, quick direct-reading continuous monitoring.Deficiencies such as the carbon dioxide sensor of present various detection usefulness mainly contains solid electrolyte formula, barium titanate composite oxides condenser type, electricity and leads change type thick-film type etc., and there is poor selectivity to gas in these sensors, is prone to wrong report, needs frequent calibration, lack serviceable life.
Summary of the invention:
The present invention is exactly to the problems referred to above, and the CO based on infrared sensor that a kind of measurement range is wide, highly sensitive, the response time is fast, selectivity good, antijamming capability is strong is provided
2Detection Circuit.
For reaching above purpose; The present invention adopts following technical scheme; The present invention includes infrared carbon dioxide sensor, digital filter circuit, amplifying circuit, current stabilization circuit, SCM system, temperature compensation; Its structural feature is that the infrared carbon dioxide sensor converts detected density of carbon dioxide gas to corresponding electric signal, and the electric signal of output passes through filtering, processing and amplifying respectively, is input to SCM system; And after temperature and atmospheric pressure compensating etc. are handled, send display device to show its measured value by SCM system output.
The beneficial effect of the invention:
Facts have proved that this detection circuit operation is simple, numerical value shows that volume is urinated in carrying, and is very directly perceived, continuous fast detecting, but the content of the various occasion carbon dioxides in detection at any time indoor and outdoor.
Description of drawings:
Fig. 1 is carbon dioxide testing circuit figure.
Embodiment:
The present invention includes infrared carbon dioxide sensor, digital filter circuit, amplifying circuit, current stabilization circuit, SCM system, temperature compensation; The infrared carbon dioxide sensor converts detected density of carbon dioxide gas to corresponding electric signal; The electric signal of output passes through filtering, processing and amplifying respectively; Be input to SCM system, and after temperature and atmospheric pressure compensating etc. are handled, send display device to show its measured value by SCM system output.
At first will detect the concentration of carbon dioxide and convert electric signal to by infrared sensor; Filtering circuit extracts electric signal and outputs to amplifying circuit; Handle back output through SCM system, send into display circuit by 74AC138 again, to realize detection density of carbon dioxide gas.
Form filtering circuit by R1, R2, R3, R4, C1, C2 and amplifier in the circuit, in circuit, both introduced negative feedback, introduced positive feedback again; When signal frequency went to zero, it is infinitely great that the reactance of C1 is tending towards, a little less than the positive feedback very; When signal frequency was tending towards infinity, the reactance of C2 went to zero; So just guaranteed when signal frequency going to zero and infinity between any one value, filtering circuit can normal extraction corresponding electric signal; Amplifying circuit after the filtering circuit, its effect are that the signal that filtering circuit is exported is amplified to certain degree, so that drive load.R6 and C4 series connection constitute corrective network and are used for circuit is carried out phase compensation.
Claims (2)
1. based on the CO of infrared sensor
2Detection Circuit; Comprise infrared carbon dioxide sensor, digital filter circuit, amplifying circuit, current stabilization circuit, SCM system, temperature compensation; It is characterized in that the infrared carbon dioxide sensor converts detected density of carbon dioxide gas to corresponding electric signal, the electric signal of output passes through filtering, processing and amplifying respectively, is input to SCM system; And after temperature and atmospheric pressure compensating etc. are handled, send display device to show its measured value by SCM system output.
2. according to the said CO of claim 1 based on infrared sensor
2Detection Circuit is characterized in that forming filtering circuit by R1, R2, R3, R4, C1, C2 and amplifier in the circuit, in circuit, has both introduced negative feedback, has introduced positive feedback again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105121593A CN102455280A (en) | 2010-10-20 | 2010-10-20 | CO2 gas detection circuit based on infrared sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105121593A CN102455280A (en) | 2010-10-20 | 2010-10-20 | CO2 gas detection circuit based on infrared sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102455280A true CN102455280A (en) | 2012-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105121593A Pending CN102455280A (en) | 2010-10-20 | 2010-10-20 | CO2 gas detection circuit based on infrared sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102455280A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364365A (en) * | 2013-07-05 | 2013-10-23 | 扬州大学 | WSN (Wireless Sensor Network) sensor node for natural gas content in air |
-
2010
- 2010-10-20 CN CN2010105121593A patent/CN102455280A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364365A (en) * | 2013-07-05 | 2013-10-23 | 扬州大学 | WSN (Wireless Sensor Network) sensor node for natural gas content in air |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120516 |