CN201199228Y - Intelligent instrument for monitoring infrared multi-component harmful gas - Google Patents
Intelligent instrument for monitoring infrared multi-component harmful gas Download PDFInfo
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- CN201199228Y CN201199228Y CN 200820035826 CN200820035826U CN201199228Y CN 201199228 Y CN201199228 Y CN 201199228Y CN 200820035826 CN200820035826 CN 200820035826 CN 200820035826 U CN200820035826 U CN 200820035826U CN 201199228 Y CN201199228 Y CN 201199228Y
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Abstract
The utility model discloses an intelligent multicomponent harmful gas infrared monitor which comprises an infrared source provided with a parabolic reflector. An optical circuit in front of the infrared source is internally provided with a focusing lens and a rotatable gas filter correlation wheel. The gas filter correlation wheel is provided with an anti-dazzling screen as a synchronous hole and additionally provided with a plurality of measuring gas chambers and reference gas chambers corresponding to the measuring gas chambers. Light filters are installed in front of or at the rear of each measuring gas chamber and each reference gas chamber. Emergent light filtered and modulated by the gas filter correlation wheel enters the entrance port of a multiple-reflection absorption cell on which a gas inlet and a gas outlet are arranged. An infrared detector is installed in an optical circuit after the exit port of the multiple-reflection absorption cell. Output signals of the infrared detector are accessed into a signal processing and displaying unit and communication is carried out between the infrared detector and a PC machine. In the intelligent multicomponent harmful gas infrared monitor, the problem of cross interference of the multicomponent gas measurement can be well solved since gas correlation filtering and optical filtering are combined. Only one infrared detector is required by a time multiple light beam system that is formed by the gas filter correlation wheel, thus being capable of reducing the number of the infrared detectors and avoiding the discreteness caused by different detectors.
Description
Technical field:
The utility model belongs to environmental monitoring, emergent and early warning technology field, specifically is a kind of intelligent infrared multi-component harmful gas monitoring device.
Background technology:
The multicomponent gas quantitative test has a wide range of applications in field of environment protection.The variation of industry, traffic, weather has brought the increasing pressure to environmental protection.The advanced gas-monitoring technology of exploitation meets that China builds a conservation-minded society, the policy guidance of energy-saving and emission-reduction in the environmental protection field, so the high Precision Detection of harmful gas has crucial meaning for socio-economic development.
Gas measuring method mainly comprises electrochemical process, non-dispersive infrared method, laser absorption harmonic wave method and fourier transform analysis method at present.The electrochemical process measuring accuracy is low, and repeatability is relatively poor, only is fit to general the application; There is the shortcoming of cross sensitivity in simple non-dispersive infrared method; Though laser absorption harmonic wave method and fourier transform analysis method have good measurement effect, complex structure, cost an arm and a leg, and critical component must dependence on import.
The utility model content:
In view of the present situation of gas-monitoring technology, the multi-component harmful gas monitoring method of research, cost performance reasonable in design and device are very necessary.The utility model provides a kind of intelligent infrared multi-component harmful gas monitoring device, has obtained technological breakthrough aspect the cross interference that exists in solving multicomponent gas Measurement and analysis process and the contradiction of resolution.
The technical solution of the utility model is as follows:
Intelligent infrared multi-component harmful gas monitor, it is characterized in that including infrared light supply, condenser lens and revolvable gas filter correlation wheel is installed in the light path in infrared light supply the place ahead, the gas filter correlation wheel is provided with an anti-dazzling screen as synchronous hole, other is provided with many group measurement air chambers and reaches corresponding reference air chamber with it, the described air chamber of respectively measuring, the place ahead or the rear of each reference gas chamber are equipped with optical filter, through the emergent light after gas filter correlation wheel spin filter and the modulation, enter the entrance port of multiple reflectance cell, have on the multiple reflectance cell into, the gas outlet, in the light path behind the exit portal of multiple reflectance cell, infrared eye is installed, the output signal of infrared eye is linked into signal Processing and display unit, carries out communication with PC simultaneously.
Described intelligent infrared multi-component harmful gas monitor, it is characterized in that measuring air chamber for every group reaches corresponding reference air chamber with it, it is measured and fills the gas composition of disturbing mutually in the air chamber, fill the measurement gas component of high concentration in the reference gas chamber, the infrared spectrum absorpting peak of the described gas composition of disturbing mutually is close with the measurement gas component; Measure the place ahead of air chamber or the infrared spectrum absorpting peak of the optical filter permeametry gas composition that install at the rear, and the optical filter that install at reference gas chamber the place ahead or rear sees through the infrared spectrum absorpting peak of measurement gas component wherein, and described optical filter is narrow band pass filter.
Described intelligent infrared multi-component harmful gas monitor is characterized in that described every group of measurement air chamber reaches corresponding reference air chamber with it, comprises two measurement air chambers and a shared reference gas chamber thereof, and establishing two measurement air chambers is M
A, M
B, reference gas chamber is R
AB, R
ABIn be filled with measurement gas component A, B simultaneously, be to eliminate cross interference, measure air chamber M
AIn be filled with mutually the gas composition B that disturbs, measure air chamber M
BIn be filled with mutually the gas composition A that disturbs; The infrared spectrum absorpting peak of measurement gas component A, B is close; Measure air chamber M
AThe infrared spectrum absorpting peak of the optical filter permeametry gas composition A that install at the place ahead or rear is measured air chamber M
BThe infrared spectrum absorpting peak of the optical filter permeametry gas composition B that install at the place ahead or rear, reference gas chamber R
ABThe optical filter that install at the place ahead or rear sees through gas A, B infrared spectrum absorpting peak simultaneously, and described optical filter is narrow band pass filter.
Described measurement gas component A all is meant A gas with the gas composition A that disturbs mutually, and the measurement gas B component all is meant B gas with the gas composition B that disturbs mutually.
Described infrared multi-component harmful gas monitor is characterized in that described gas filter correlation wheel is by step motor drive.
Described intelligent infrared multi-component harmful gas monitor is characterized in that the measurement air chamber of described gas filter correlation wheel and reference gas chamber all are the air chamber by interference filter and the sealing of infra-red transmitting window mouth sheet.
Described intelligent infrared multi-component harmful gas monitor is characterized in that the described gas absorption cell that repeatedly reflects is the aluminum alloy material absorption cell of inwall through Nickel Plating Treatment.
Described intelligent infrared multi-component harmful gas monitor is characterized in that described infrared light supply for carrying parabolic mirror, and the radiation wavelength scope is 2～20 μ m.
Characteristics of the present utility model are following aspect: special construction gas filter correlation wheel; Reasonably modulating frequency and drive motor are selected; The repeatedly reflection gas absorption cell that can adjust flexibly; Long-life infrared light supply; Highly sensitive infrared eye; Advanced analog and digital signal disposal route.
(1) gas filter correlation wheel
Gas filter correlation wheel of the present utility model is followed the pulsed light that the continuous infrared light of motor turning handle is modulated into certain frequency on the one hand, by optical filter is installed the absorption spectrum of gas to be measured is selected on the other hand, the more important thing is to be filled with specific gas component to eliminate cross interference to measuring air chamber, each air chamber is equipped with independent inflation inlet.
(2) stepper motor and driving thereof
For the signal to noise ratio (S/N ratio) that improves photosignal with reduce influencing each other between the adjacent measurement air chamber, the modulating frequency of infrared light should not be too high, gets 200Hz.For the gas filter correlation wheel of totally ten six measurements, reference gas chamber, the stepper motor rotation speed n should be:
n＝60×200/16＝750rpm
For making the even running under given rotating speed of gas filter correlation wheel, the chosen steps motor is as the drive motor of gas filter correlation wheel.Stepper motor belongs to brushless electric machine, and the reliability height is easy to starting and stops, and self-lock ability is arranged when stopping, and is easy to the location.Adopt special purpose driver to carry out step pitch segmentation control,, can under ultralow rotating speed, change apart from ground stable operation by height by reducing step pitch.
(3) repeatedly reflect gas absorption cell
According to Lambert-Beer's law (Beer-Lambert Law), gas molecule is done the time spent mutually with infrared light, its incident intensity I
ODecay increase with the increase of light path L and concentration C:
I＝I
Oexp(-μCL)
That is to say that for specific measuring system, light path L is long more, but measurement gas concentration of component C is low more, measurement sensitivity is high more.Absorption cell has the three-dimensional trim holder of particular design in the utility model, can adjust order of reflection flexibly to adjust light path, measures range thereby change, and optimizes measurement result.Adopt silver-plated or gold-plated spherical reflector, guarantee that infrared light is unlikely in reflection process repeatedly to be attenuated too much, guarantee very high reflectivity.
(4) infrared light supply
Employing carries the wide spectrum infrared light supply of parabolic mirror, stable performance, and the angle of divergence is little, and radiation power is strong.This infrared light supply radiation wavelength scope is 2～20 μ m, has covered the absorption spectra of numerous gases, is suitable for measuring multicomponent gas.For making stabilized intensity, adopt the constant current power supply mode.
(5) infrared eye
Employing has the guide type high sensitivity infrared eye of immersion lens as optical signal detector spare, and this device has high response speed, compares with common pyroelectric detector to have remarkable advantages.The detector time constant that the utility model adopts is less than 1 microsecond, and spectral range is 2～8 μ m, satisfies application requirements fully.For detector provides the DC bias current of 10mA, guarantee very high detectivity.
(6) signal processing unit
The preamplifier state of the utility model signal processing unit adopts the low noise ac amplifier circuit.Adopt the high-speed dsp data collecting card that photosignal is carried out the AD conversion, get after the area of absorption peak is calculated measure passage and reference channel ratio as raw data, these ratios have comprised corresponding measurement gas component concentrations information.The utility model and device thereof be by reading the gas composition that oneself knows concentration, writes down corresponding AD sampling, the data after handling, and carries out concentration calibration and correction by the nonlinear multivariable alignment technique.Calibrating parameters is stored in the nonvolatile memory EEPROM of device, as the foundation of calculating gas concentration in the measuring process.Device transmits the measurement data of gas concentration by RS-232 interface and computing machine communication.Device then produces the output of reporting to the police after detecting abnormal concentrations.
Compare with the space multiple beam system of common NDIR (Non-Dispersive Infrared) sensor, the utility model is owing to having adopted the gas filter correlation wheel to form time multiple beam system.In time multiple beam system, only need an infrared eye, can save the quantity of infrared eye like this, the discreteness of avoiding different detectors to bring, and, can adopt more high-quality device because quantity reduces.
Description of drawings:
Accompanying drawing 1 is gas filter correlation wheel synoptic diagram.
Accompanying drawing 2 (a) and (b) are respectively and repeatedly reflect gas absorption cell 4 secondary reflections and 16 secondary reflection hot spot distribution plans.
Accompanying drawing 3 is an infrared light supply constant current power supply circuit.
Accompanying drawing 4 is the signal Processing block diagram.
Accompanying drawing 5 constitutes synoptic diagram for system.
Embodiment:
Intelligent infrared multi-component harmful gas monitor chief component comprises: stepper motor 1, infrared light supply 2, condenser lens 3, gas filter correlation are taken turns 4, are repeatedly reflected gas absorption cell 5, sampling air pump 6, infrared eye 7, signal-processing board 8, operation display unit 9, and system constitutes as shown in Figure 5.
The infrared light that infrared light supply 2 sends, line focus lens 3 focus on, be sent to and repeatedly reflect gas absorption cell 5 after being taken turns 4 spin filters and modulation by gas filter correlation, through repeatedly being sent to infrared eye 7 after the reflection, detector is converted to faint electric signal with light signal, and electric signal is sent to signal-processing board 8 through amplifying, through simulation and digital processing, be sent to display unit 9, while and PC carry out communication.
An anti-dazzling screen is set as synchronous hole on the gas filter correlation wheel 4, every kind of corresponding measurement air chamber of gas, the shared reference gas chamber of per two kinds of gasmetry air chambers, existing measurement with ten component gas A～J describes correlation filtering wheel inflation method:
A, B gasmetry air chamber M
A, M
BShared reference gas chamber R
ABConstitute one group, reference gas chamber R
ABBe filled with A, B gas composition simultaneously.For eliminating cross interference, A gasmetry air chamber M
AFill the B gas composition, B gasmetry air chamber M
BFill the A gas composition.
The infrared spectrum absorpting peak of A, B gas is close; Measure air chamber M
AThe absorption peak of the optical filter permeametry gas composition A that install at the place ahead or rear is measured air chamber M
BThe infrared spectrum absorpting peak of the optical filter permeametry gas composition B that install at the place ahead or rear, reference gas chamber R
ABThe optical filter that install at the place ahead or rear sees through gas A, B infrared spectrum absorpting peak simultaneously, and described optical filter is narrow band pass filter.Below respectively organizing gas all handles by mentioned above principle.
C, D gasmetry air chamber M
C, M
DShared reference gas chamber R
CDConstitute one group, reference gas chamber R
CDBe filled with C, D gas composition simultaneously.For eliminating cross interference, C gasmetry air chamber M
CFill the D gas composition, D gasmetry air chamber M
DFill the C gas composition.
E, F gasmetry air chamber M
E, M
FShared reference gas chamber R
EFConstitute one group, reference gas chamber R
EFBe filled with E, F gas composition simultaneously.For eliminating cross interference, E gasmetry air chamber M
EFill the F gas composition, F gasmetry air chamber M
FFill the E gas composition.
G, H gasmetry air chamber M
G, M
HShared reference gas chamber R
GHConstitute one group, reference gas chamber R
GHBe filled with G, H gas composition simultaneously.For eliminating cross interference, G gasmetry air chamber M
GFill the H gas composition, H gasmetry air chamber M
HFill the G gas composition.
I, J gasmetry air chamber M
I, M
JShared reference gas chamber R
IJConstitute one group, reference gas chamber R
IJBe filled with I, J gas composition simultaneously.For eliminating cross interference, I gasmetry air chamber M
IFill the J gas composition, J gasmetry air chamber M
JFill the I gas composition.
Two kinds of gas selection principles of shared reference gas chamber are in the correlation filtering wheel: infrared spectrum absorpting peak leans on very closely, the gas of the easiest phase mutual interference.Measure the infrared spectrum absorpting peak of the main corresponding measurement gas component of optical filter of air chamber installation, and the optical filter that reference gas chamber is installed sees through the infrared absorption spectrum of two kinds of gases simultaneously, because two kinds of gas infrared spectrum absorption peaks lean on very closely, so each optical filter all is a narrow band pass filter.
The incident end of gas filter correlation wheel is equipped with condenser lens 3, to increase light signal strength, improves signal to noise ratio (S/N ratio), the measuring accuracy of assurance device.
Repeatedly reflecting gas absorption cell 5 has directly influenced the performance of device.For gas absorption cell is not corroded when measuring harmful gas, inwall carries out the nickel plating preservative treatment.For guaranteeing to measure response speed, the design volume of gas absorption cell is less.After the infrared light of repeatedly reflection is transformed to the 200Hz electric signal by detector 7 detections, is sent to signal-processing board 7 and handles.The AD conversion chip cooperation dominant frequency of 16 500kbps of the utility model employing is that the high speed digital signal processor (DSP) of 150M carries out data sampling, analysis, and device is provided with operation display unit 9, mainly is made of LCD display and touch key-press.DSP is by RS-232 serial line interface and computing machine communication, and operation has demarcation, correction and the monitoring of software based on virtual instrument on the computing machine.According to actual needs, install configurable have 4-20mA simulated concentration signal and the output of RS-485 numeral concentration signal.
Claims (7)
1. intelligent infrared multi-component harmful gas monitor, it is characterized in that including infrared light supply, condenser lens and revolvable gas filter correlation wheel is installed in the light path in infrared light supply the place ahead, the gas filter correlation wheel is provided with an anti-dazzling screen as synchronous hole, other is provided with many group measurement air chambers and reaches corresponding reference air chamber with it, the described air chamber of respectively measuring, the place ahead or the rear of each reference gas chamber are equipped with optical filter, through the emergent light after gas filter correlation wheel spin filter and the modulation, enter the entrance port of multiple reflectance cell, have on the multiple reflectance cell into, the gas outlet, in the light path behind the exit portal of multiple reflectance cell, infrared eye is installed, the output signal of infrared eye is linked into signal Processing and display unit, carries out communication with PC simultaneously.
2. intelligent infrared multi-component harmful gas monitor according to claim 1, it is characterized in that measuring air chamber for every group reaches corresponding reference air chamber with it, it is measured and fills the gas composition of disturbing mutually in the air chamber, fill the measurement gas component of high concentration in the reference gas chamber, the infrared spectrum absorpting peak of the described gas composition of disturbing mutually is close with the measurement gas component; Measure the place ahead of air chamber or the infrared spectrum absorpting peak of the optical filter permeametry gas composition that install at the rear, and the optical filter that install at reference gas chamber the place ahead or rear sees through the infrared spectrum absorpting peak of measurement gas component wherein, and described optical filter is narrow band pass filter.
3. intelligent infrared multi-component harmful gas monitor according to claim 1 and 2, it is characterized in that described every group of measurement air chamber reaches corresponding reference air chamber with it, comprise two measurement air chambers and a shared reference gas chamber thereof, establishing two measurement air chambers is M
A, M
B, reference gas chamber is R
AB, R
ABIn be filled with measurement gas component A, B simultaneously, be to eliminate cross interference, measure air chamber M
AIn be filled with mutually the gas composition B that disturbs, measure air chamber M
BIn be filled with mutually the gas composition A that disturbs; The infrared spectrum absorpting peak of measurement gas component A, B is close; Measure air chamber M
AThe infrared spectrum absorpting peak of the optical filter permeametry gas composition A that install at the place ahead or rear is measured air chamber M
BThe infrared spectrum absorpting peak of the optical filter permeametry gas composition B that install at the place ahead or rear, reference gas chamber R
ABThe optical filter that install at the place ahead or rear sees through gas A, B infrared spectrum absorpting peak simultaneously, and described optical filter is narrow band pass filter.
4. intelligent infrared multi-component harmful gas monitor according to claim 1 and 2 is characterized in that described gas filter correlation wheel is by step motor drive.
5. intelligent infrared multi-component harmful gas monitor according to claim 1 and 2 is characterized in that the measurement air chamber of described gas filter correlation wheel and reference gas chamber all are the air chamber by interference filter and the sealing of infra-red transmitting window mouth sheet.
6. intelligent infrared multi-component harmful gas monitor according to claim 1 and 2 is characterized in that the described gas absorption cell that repeatedly reflects is the aluminum alloy material absorption cell of inwall through Nickel Plating Treatment.
7. intelligent infrared multi-component harmful gas monitor according to claim 1 and 2 is characterized in that described infrared light supply for carrying parabolic mirror, and the radiation wavelength scope is 2～20 μ m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820035826 CN201199228Y (en) | 2008-05-19 | 2008-05-19 | Intelligent instrument for monitoring infrared multi-component harmful gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820035826 CN201199228Y (en) | 2008-05-19 | 2008-05-19 | Intelligent instrument for monitoring infrared multi-component harmful gas |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128804A (en) * | 2010-11-12 | 2011-07-20 | 上海芯敏微系统技术有限公司 | Side wall air inlet/outlet infrared air sensor |
| CN102359948A (en) * | 2011-06-29 | 2012-02-22 | 中国科学院安徽光学精密机械研究所 | System and method for measuring greenhouse gas |
| CN103115890A (en) * | 2012-12-29 | 2013-05-22 | 聚光科技(杭州)股份有限公司 | Synchronous sampling method for GFC (gas filter correlation) wheels |
| CN103822892A (en) * | 2014-02-28 | 2014-05-28 | 江苏物联网研究发展中心 | Infrared gas sensor |
| 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 |
| CN105606560A (en) * | 2016-01-12 | 2016-05-25 | 东莞石龙津威饮料食品有限公司 | Lactobacillus beverage shelf life quality detection sensor and lactobacillus beverage shelf life quality detection method |
| CN108760667A (en) * | 2018-07-16 | 2018-11-06 | 武汉敢为科技有限公司 | A kind of multi-channel assembled infrared gas detection device of single light source |
| CN108827906A (en) * | 2018-04-20 | 2018-11-16 | 合肥工业大学 | A kind of near infrared spectrum multicomponent gas on-line detecting system and method |
| CN110044837A (en) * | 2019-04-11 | 2019-07-23 | 南京安控易创计算机科技有限公司 | A kind of difference absorption spectrum gas-detecting device based on fiber amplifier |
| CN111693481A (en) * | 2020-06-23 | 2020-09-22 | 贵州电网有限责任公司 | Determination of SF6Method for calibrating non-dispersive infrared absorption spectrum of CO content in gas |
| CN113029996A (en) * | 2021-03-31 | 2021-06-25 | 山东大学 | Hydrogen purity online detection instrument and use method and application thereof |
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2008
- 2008-05-19 CN CN 200820035826 patent/CN201199228Y/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128804A (en) * | 2010-11-12 | 2011-07-20 | 上海芯敏微系统技术有限公司 | Side wall air inlet/outlet infrared air sensor |
| CN102128804B (en) * | 2010-11-12 | 2013-06-19 | 上海芯敏微系统技术有限公司 | Side wall air inlet/outlet infrared air sensor |
| CN102359948A (en) * | 2011-06-29 | 2012-02-22 | 中国科学院安徽光学精密机械研究所 | System and method for measuring greenhouse gas |
| CN102359948B (en) * | 2011-06-29 | 2013-10-09 | 中国科学院安徽光学精密机械研究所 | System and method for measuring greenhouse gas |
| CN103115890A (en) * | 2012-12-29 | 2013-05-22 | 聚光科技(杭州)股份有限公司 | Synchronous sampling method for GFC (gas filter correlation) wheels |
| CN103115890B (en) * | 2012-12-29 | 2015-06-10 | 聚光科技(杭州)股份有限公司 | Synchronous sampling method for GFC (gas filter correlation) wheels |
| CN103822892A (en) * | 2014-02-28 | 2014-05-28 | 江苏物联网研究发展中心 | Infrared gas sensor |
| 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 |
| CN105606560A (en) * | 2016-01-12 | 2016-05-25 | 东莞石龙津威饮料食品有限公司 | Lactobacillus beverage shelf life quality detection sensor and lactobacillus beverage shelf life quality detection method |
| CN105606560B (en) * | 2016-01-12 | 2018-05-29 | 东莞石龙津威饮料食品有限公司 | A kind of sour milk beverage shelf-life quality detection sensor and detection method |
| CN108827906A (en) * | 2018-04-20 | 2018-11-16 | 合肥工业大学 | A kind of near infrared spectrum multicomponent gas on-line detecting system and method |
| CN108760667A (en) * | 2018-07-16 | 2018-11-06 | 武汉敢为科技有限公司 | A kind of multi-channel assembled infrared gas detection device of single light source |
| CN110044837A (en) * | 2019-04-11 | 2019-07-23 | 南京安控易创计算机科技有限公司 | A kind of difference absorption spectrum gas-detecting device based on fiber amplifier |
| CN110044837B (en) * | 2019-04-11 | 2021-10-15 | 南京安控易创计算机科技有限公司 | Differential absorption spectrum gas detection device based on optical fiber amplifier |
| CN111693481A (en) * | 2020-06-23 | 2020-09-22 | 贵州电网有限责任公司 | Determination of SF6Method for calibrating non-dispersive infrared absorption spectrum of CO content in gas |
| CN113029996A (en) * | 2021-03-31 | 2021-06-25 | 山东大学 | Hydrogen purity online detection instrument and use method and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090225 Effective date of abandoning: 20080519 |