CN103674882A - Non-dispersive infrared light gas detection system - Google Patents
Non-dispersive infrared light gas detection system Download PDFInfo
- Publication number
- CN103674882A CN103674882A CN201310722559.0A CN201310722559A CN103674882A CN 103674882 A CN103674882 A CN 103674882A CN 201310722559 A CN201310722559 A CN 201310722559A CN 103674882 A CN103674882 A CN 103674882A
- Authority
- CN
- China
- Prior art keywords
- infrared light
- signal
- gas
- air chamber
- bounds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a non-dispersive infrared light gas detection system adopting an electric pulse infrared light modulation method, so as to reduce power consumption at the part where infrared light is modulated, and stability is improved; an internal coating method is adopted in structural design of a gas chamber, so that infrared light diffusion and external disturbance are reduced further, and gas detection accuracy is improved; a calibrating circuit is used for signal processing, so that different collected gas can be detected accurately through calibration; a programmable logic device is adopted to calibrate different environmental factors in air through software collection, the functions of data teletransmission, abnormity warning and the like are achieved through FPGA treatment, thereby improving module detection precision, timeliness and stability and reducing system cost simultaneously. The non-dispersive gas detection system disclosed by the invention has the advantages that the system is small in volume and low in power consumption, continuity and timeliness of gas detection can be achieved, and the detection precision is improved greatly.
Description
Technical field
The invention belongs to overstepping one's bounds infrared light gas sensor field, relate in particular to a kind of overstepping one's bounds infrared light gas detecting system.
Background technology
Along with the raising of people to environmental sanitary safety consciousness, quality of air environment is monitored continuously and required further to improve.In Non-Dispersive Infra-red (NDIR) gas context of detection, be developed rapidly both at home and abroad at present, be widely applied, but gas detects and has adopted electromechanics modulated infrared light mostly, and there are various defects in electromechanics modulated infrared light detecting instrument, as: power consumption is large, poor stability, accuracy of detection is not high, and in the continuous observation process to harmful gas, real-time is poor etc.
Summary of the invention
For addressing the above problem, the invention provides a kind of overstepping one's bounds infrared light gas detecting system, this overstepping one's bounds infrared light gas detecting system volume is little, low in energy consumption, and can realize continuity, real-time that gas detects, and accuracy of detection is greatly improved.
Overstepping one's bounds infrared light gas detecting system of the present invention, comprising: sampling air chamber, signal amplifier, calibration processor, signal processor;
Described sampling air chamber utilizes MEMS electrical modulation infrared light supply to send the infrared light that wavelength coverage is 2～20 μ m;
In described sampling air chamber, infrared light supply, optical filter and infrared eye are installed successively, and three is positioned on same optical centre axle;
Described overstepping one's bounds infrared light gas detecting system adopts reaction type three-stage amplifier, wherein first order circuit is converted into voltage signal by current signal, second level circuit amplifies processing to described voltage signal, and tertiary circuit will be converted into 4～20mA standard current signal through amplifying the voltage signal of processing;
The job step of described overstepping one's bounds infrared light harmful gas detection system is as follows:
S
01, described sampling air chamber utilizes the IRL715 infrared light supply based on MEMS, according to electrical modulation signal, modulates, and produces infrared light, and described infrared light sees through optical filter and arrives output electrical signals on infrared eye;
S
02, described signal amplifier amplifies processing to the electric signal of described sampling air chamber output, by described electric signal conditioning, is standard signal;
S
03, described calibration processor is carried out the adjusting of sensing range and zero point drift by configure adjustable potential meter in reaction type three-stage amplifier to described standard signal, will be converted into 4～20mA standard current signal through amplifying the standard signal of processing;
S
04described signal processor by A D Acquisition Circuit described 4～20mA current signal is converted into digital quantity signal, in programmable logic controller (PLC) FPGA, complete the conversion of electric current and air gas content, according to conversion result and gas setting scope, obtain testing result.
Further, described signal processor obtains after testing result, also carries out following processing:
Testing result is carried out to data storage by inner FIFO;
By RS485 serial ports, carry out data upload;
By extending out display screen, carry out data and show in real time;
According to testing result and gas setting scope, judge whether extremely, and by the flicker of interface pilot lamp, report to the police when abnormal.
Further, the inwall of described sampling air chamber adopts gold-plated quartz glass tube material to carry out plated film;
The lower inwall of described sampling air chamber is provided with air intake opening, and upper inwall is provided with gas outlet;
Beneficial effect of the present invention is:
1. utilize MEMS electrical modulation infrared light supply, the intensity of light source is stable, makes in air the content and output signal can linear scaling output, to the detection sensitivity of gas, can reach 0.1ppm, can meet common gas analysis demand.
2. adopt air chamber to adopt coating technique, avoided complicated owing to detecting gas componant, Long contact time causes the defect of corrosion to it, has also avoided the impact of etchant gas on accuracy of detection, thereby accuracy of detection is greatly improved.
3. adopt reaction type three-stage amplifier there is high precision, drift about little, respond fast advantage, by the amplification of signal and processing, realized simulating signal and the calibration function to sensing range, drift linear corresponding with gas concentration.
4. the present invention has realized long-term, stable, reliable, the continuous Real-Time Monitoring of harmful gas, can extensively be installed to the occasions such as conference centre, megastore, Waiting Lounge, waiting room, hotel, in real time air quality is monitored.
Accompanying drawing explanation
Fig. 1 is the sampling air chamber structure schematic diagram of overstepping one's bounds infrared light gas detecting system of the present invention;
Fig. 2 is overstepping one's bounds infrared light gas detecting system fundamental diagram of the present invention.
Embodiment
Fig. 1 is the sampling air chamber structure schematic diagram of overstepping one's bounds infrared light gas detecting system of the present invention.In figure, electrical modulation signal and infrared light supply provide the infrared light of single wavelength for gas detects; Plated film air chamber inwall adopts gold-plated quartz glass tube material, has reduced to the full extent the loss of infrared light in communication process, has increased corrosion resistivity; Upper and lower two pores are realized detection gas and are circulated in plated film air chamber; Infrared light sees through optical filter and arrives on infrared eye, and infrared eye is realized the infrared light intensity detection after gas absorption, and exports corresponding voltage signal according to light intensity.
Fig. 2 is overstepping one's bounds infrared light gas detecting system fundamental diagram of the present invention.Utilize Lamber-Beer law, this characteristic of infrared light for specific gas molecule absorption wavelengths characteristic, when gas passes through detection air chamber by diffusion type, the light source of air chamber one end will be absorbed a part, the other end at air chamber will detect this light intensity variation, light intensity is changed and is converted to change in electric, then converted gas componant in air is detected through electrical signal collection.
Sampling air chamber utilizes the principle of specific gas to fixed wave length infrared Absorption, and the variation by gas content in air is converted to change in electric by infrared eye.
Signal amplifies the amplification realizing infrared detector weak signal, by feeble signal conditioning, is standard signal, realizes electric signal and detects gas content linear relationship;
Calibrated section is mainly that the adjustable potential meter by configuring in amplifying circuit is realized the adjusting aspect sensing range, zero point drift two, realizes sensor in long-term use procedure calibration.
Signal processing adopts FPGA for core processor designs, and has realized the functions such as signals collecting, Data Analysis, software calibration, and has carried out real time data interpretation, demonstration and abnormal data warning etc. according to setup parameter scope.For different gas, adopt different data processing algorithms, data are optimized, improved real-time and the reliability of data storages.
The electrical modulation infrared light supply of utilization based on MEMS technology, emission wavelength scope is 2～20 μ m, can meet common gas and analyze demand, modulating frequency can reach 200Hz.Stable for improving the intensity of light source, adopt accurate low pressure voltage stabilizing chip to drive, remove to send output error ± 0.7%.Adopt FPGA to control to reach light source is driven and modulation object, overcome the shortcomings such as the instability of light source and shock resistance be poor.For reducing ambient temperature, change the impact on accuracy of detection, for reducing manufacture difficulty and factor easy for installation, in air chamber structure design, adopt independent design simultaneously; Simultaneously complicated owing to detecting gas componant, Long contact time can cause certain corrosion to air chamber, affects accuracy of detection, therefore at air chamber inwall, adopts coating technique, selects gold-plated quartz glass tube on air chamber.Through above two aspects, improve, can improve accuracy of detection and be easy to again handling, change.
As shown in Figure 2, overstepping one's bounds infrared light gas detecting system of the present invention, comprising: sampling air chamber, signal amplifier, calibration processor, signal processor;
Described sampling air chamber utilizes MEMS electrical modulation infrared light supply to send the infrared light that wavelength coverage is 2～20 μ m;
The inwall of described sampling air chamber adopts gold-plated quartz glass tube material to carry out plated film;
The lower inwall of described sampling air chamber is provided with air intake opening, and upper inwall is provided with gas outlet;
In described sampling air chamber, infrared light supply, optical filter and infrared eye are installed successively, and three is positioned on same optical centre axle;
Described signal amplifier adopts reaction type three-stage amplifier, wherein first order circuit is converted into voltage signal by current signal, second level circuit amplifies processing to described voltage signal, and tertiary circuit will be converted into 4～20mA standard current signal through amplifying the voltage signal of processing;
The job step of described overstepping one's bounds infrared light harmful gas detection system is as follows:
S
01, described sampling air chamber utilizes the IRL715 infrared light supply based on MEMS, according to electrical modulation signal, modulates, and produces infrared light, and described infrared light sees through optical filter and arrives output electrical signals on infrared eye;
S
02, described signal amplifier amplifies processing to the electric signal of described sampling air chamber output, by described electric signal conditioning, is standard signal;
S
03, described calibration processor is carried out the adjusting of sensing range and zero point drift by configure adjustable potential meter in reaction type three-stage amplifier to described standard signal, will be converted into 4～20mA standard current signal through amplifying the standard signal of processing;
S
04described signal processor by A D Acquisition Circuit described 4～20mA current signal is converted into digital quantity signal, in programmable logic controller (PLC) FPGA, complete the conversion of electric current and air gas content, according to conversion result and gas setting scope, obtain testing result.
Further, described signal processor obtains after testing result, also carries out following processing:
Testing result is carried out to data storage by inner FIFO;
By RS485 serial ports, carry out data upload;
By extending out display screen, carry out data and show in real time;
According to testing result and gas setting scope, judge whether extremely, and by the flicker of interface pilot lamp, report to the police when abnormal.
Because the voltage signal of infrared eye output is very faint, generally, tens millivolts of levels, weak signal is easily disturbed, thereby affects accuracy of detection.Adopt reaction type three-stage amplifier, adopt high precision, drift about little, respond fast Design of Amplification Circuit, by the amplification of signal and processing, realize the simulating signal corresponding with gas concentration linearity, by coupling amplifier adjustable resistor, realize the calibration function to sensing range, drift simultaneously.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (3)
1. an overstepping one's bounds infrared light gas detecting system, comprising: sampling air chamber, signal amplifier, calibration processor, signal processor, it is characterized in that,
Described sampling air chamber utilizes MEMS electrical modulation infrared light supply to send the infrared light that wavelength coverage is 2～20 μ m;
In described sampling air chamber, infrared light supply, optical filter and infrared eye are installed successively, and three is positioned on same optical centre axle;
Further, described overstepping one's bounds infrared light gas-detecting device adopts reaction type three-stage amplifier, wherein first order circuit is converted into voltage signal by current signal, second level circuit amplifies processing to described voltage signal, and tertiary circuit will be converted into 4～20mA standard current signal through amplifying the voltage signal of processing;
The job step of described overstepping one's bounds infrared light harmful gas detecting device is as follows:
S
01, described sampling air chamber utilizes the IRL715 infrared light supply based on MEMS, according to electrical modulation signal, modulates, and produces infrared light, and described infrared light sees through optical filter and arrives output electrical signals on infrared eye;
S
02, described signal amplifier amplifies processing to the electric signal of described sampling air chamber output, by described electric signal conditioning, is standard signal;
S
03, described calibration processor is carried out the adjusting of sensing range and zero point drift by configure adjustable potential meter in reaction type three-stage amplifier to described standard signal, will be converted into 4～20mA standard current signal through amplifying the standard signal of processing;
S
04described signal processor by A D Acquisition Circuit described 4～20mA current signal is converted into digital quantity signal, in programmable logic controller (PLC) FPGA, complete the conversion of electric current and air gas content, according to conversion result and gas setting scope, obtain testing result.
2. overstepping one's bounds infrared light gas-detecting device as claimed in claim 1, is characterized in that, described signal processor obtains after testing result, also carries out following processing:
Testing result is carried out to data storage by inner FIFO;
By RS485 serial ports, carry out data upload;
By extending out display screen, carry out data and show in real time;
According to testing result and gas setting scope, judge whether extremely, and by the flicker of interface pilot lamp, report to the police when abnormal.
3. overstepping one's bounds infrared light gas detecting system as claimed in claim 1, is characterized in that,
The inwall of described sampling air chamber adopts gold-plated quartz glass tube material to carry out plated film;
The lower inwall of described sampling air chamber is provided with air intake opening, and upper inwall is provided with gas outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310722559.0A CN103674882A (en) | 2013-12-24 | 2013-12-24 | Non-dispersive infrared light gas detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310722559.0A CN103674882A (en) | 2013-12-24 | 2013-12-24 | Non-dispersive infrared light gas detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103674882A true CN103674882A (en) | 2014-03-26 |
Family
ID=50313092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310722559.0A Pending CN103674882A (en) | 2013-12-24 | 2013-12-24 | Non-dispersive infrared light gas detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103674882A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969210A (en) * | 2014-05-15 | 2014-08-06 | 中国科学院合肥物质科学研究院 | Open type CO2/H2O monitoring device based on non-dispersive infrared principle |
| CN106160678A (en) * | 2016-09-06 | 2016-11-23 | 中国核动力研究设计院 | The fast amplification system of current sensitive pulse, method and impulsive measurement system |
| CN108709868A (en) * | 2018-08-17 | 2018-10-26 | 青岛海纳光电环保有限公司 | A kind of infrared gas sensor and infrared gas detection device |
| CN108872097A (en) * | 2018-09-27 | 2018-11-23 | 南京工程学院 | A kind of specific gas derived components spectroscopic analysis methods and device |
| CN108885198A (en) * | 2016-01-13 | 2018-11-23 | 英福康有限责任公司 | Use the gas detection of the wide scope of infrared gas detector |
| WO2022127144A1 (en) * | 2020-12-14 | 2022-06-23 | 海南聚能科技创新研究院有限公司 | Infrared absorption-type carbon dioxide concentration detection device |
| CN117571647A (en) * | 2023-12-14 | 2024-02-20 | 深圳市诺安智能股份有限公司 | Multichannel gas sensor based on wavelength division multiplexing and gas detection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4859858A (en) * | 1986-12-04 | 1989-08-22 | Cascadia Technology Corporation | Gas analyzers |
| WO1999050646A1 (en) * | 1998-03-31 | 1999-10-07 | Anatel Corporation | Ndir instrument |
| CN101118215A (en) * | 2007-09-11 | 2008-02-06 | 上海神开石油化工装备股份有限公司 | Non-dispersed infra-red spectrometry method suitable for wide environmental temperature range |
| CN201110830Y (en) * | 2007-12-14 | 2008-09-03 | 煤炭科学研究总院重庆研究院 | Non-dispersive infrared methane sensor for coal mine |
| CN201716264U (en) * | 2010-07-06 | 2011-01-19 | 常州合众电气有限公司 | Non-dispersive infrared optical sulfur hexafluoride gas concentration sensor |
-
2013
- 2013-12-24 CN CN201310722559.0A patent/CN103674882A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4859858A (en) * | 1986-12-04 | 1989-08-22 | Cascadia Technology Corporation | Gas analyzers |
| WO1999050646A1 (en) * | 1998-03-31 | 1999-10-07 | Anatel Corporation | Ndir instrument |
| CN101118215A (en) * | 2007-09-11 | 2008-02-06 | 上海神开石油化工装备股份有限公司 | Non-dispersed infra-red spectrometry method suitable for wide environmental temperature range |
| CN201110830Y (en) * | 2007-12-14 | 2008-09-03 | 煤炭科学研究总院重庆研究院 | Non-dispersive infrared methane sensor for coal mine |
| CN201716264U (en) * | 2010-07-06 | 2011-01-19 | 常州合众电气有限公司 | Non-dispersive infrared optical sulfur hexafluoride gas concentration sensor |
Non-Patent Citations (4)
| Title |
|---|
| 吴飞蝶 等: "MEMS红外光源及应用", 《传感器与微系统》 * |
| 张昱 等: "新型非分光红外多组分气体分析仪的研制", 《红外技术》 * |
| 熊友辉 等: "电调制非分光红外(NDIR)气体传感器", 《仪表技术与传感器》 * |
| 管人宝 等: "非共振光声CO2气体检测系统", 《传感器与微系统》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969210A (en) * | 2014-05-15 | 2014-08-06 | 中国科学院合肥物质科学研究院 | Open type CO2/H2O monitoring device based on non-dispersive infrared principle |
| CN108885198A (en) * | 2016-01-13 | 2018-11-23 | 英福康有限责任公司 | Use the gas detection of the wide scope of infrared gas detector |
| CN106160678A (en) * | 2016-09-06 | 2016-11-23 | 中国核动力研究设计院 | The fast amplification system of current sensitive pulse, method and impulsive measurement system |
| CN108709868A (en) * | 2018-08-17 | 2018-10-26 | 青岛海纳光电环保有限公司 | A kind of infrared gas sensor and infrared gas detection device |
| CN108872097A (en) * | 2018-09-27 | 2018-11-23 | 南京工程学院 | A kind of specific gas derived components spectroscopic analysis methods and device |
| WO2022127144A1 (en) * | 2020-12-14 | 2022-06-23 | 海南聚能科技创新研究院有限公司 | Infrared absorption-type carbon dioxide concentration detection device |
| CN117571647A (en) * | 2023-12-14 | 2024-02-20 | 深圳市诺安智能股份有限公司 | Multichannel gas sensor based on wavelength division multiplexing and gas detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103674882A (en) | Non-dispersive infrared light gas detection system | |
| CN107132318B (en) | Fixed pollution source VOC on-line monitoring system | |
| CN102445437B (en) | Method and device for measuring turbidity | |
| CN103017991B (en) | Suction type SF6 gas leakage monitoring method | |
| CN202974860U (en) | High-precision infrared gas detection module | |
| CN201909754U (en) | Optical gas sensor | |
| CN200947084Y (en) | Electromodulation non-dispersed infrared gaseous sensor | |
| CN104914022A (en) | Indoor tiny particle monitor | |
| CN2932374Y (en) | SF6 intelligent environment monitoring and control system and its SF6 laser detector | |
| CN203324179U (en) | High-sensitivity portable gas detection instrument based on NDIR (Non-Dispersive Infra-Red) principle | |
| CN111220211A (en) | Environmental monitoring system based on big data | |
| CN201716264U (en) | Non-dispersive infrared optical sulfur hexafluoride gas concentration sensor | |
| CN212159551U (en) | Gas sensing device based on NDIR principle | |
| CN204903345U (en) | Reliable dust concentration detector of high stable | |
| CN207300816U (en) | A kind of particulate matter sensors based on pulsed laser deposition | |
| CN204142613U (en) | A kind of high precision small dust sensor | |
| CN103411902A (en) | Wide-range micro-water measuring system based on programmable amplifier | |
| CN203337532U (en) | Ozone concentration tester | |
| CN100561195C (en) | The non-disperse infrared spectrum determination method and the device that are suitable for wide environmental temperature range | |
| CN205049184U (en) | Humiture monitoring system based on TDLAS | |
| CN201853325U (en) | Combustible gas detection instrument | |
| CN203337541U (en) | Gas analyzer | |
| CN108169428B (en) | Formaldehyde gas, humidity and temperature integrated monitoring equipment | |
| CN203337539U (en) | Device for automatically analyzing ozone concentration by use of ultraviolet spectrometry absorption technology | |
| CN109738768A (en) | A kind of switchgear electric arc on-line measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140326 |