CN101706418A - On-line ozone analysis method and ozone analyzer - Google Patents
On-line ozone analysis method and ozone analyzer Download PDFInfo
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- CN101706418A CN101706418A CN200910109650A CN200910109650A CN101706418A CN 101706418 A CN101706418 A CN 101706418A CN 200910109650 A CN200910109650 A CN 200910109650A CN 200910109650 A CN200910109650 A CN 200910109650A CN 101706418 A CN101706418 A CN 101706418A
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Abstract
The invention discloses an online ozone analysis method for online monitoring the change of ozone concentration and researching the ozone space-time distribution by using a DOAS method and an online ozone analyzer adopting the method.
Description
Technical field
The present invention relates to analysis method for gases, especially relate to method that a kind of online ozone analysis monitoring ozone concentration changes, the ozone of research ozone spatial and temporal distributions is analyzed and the online ozone analyzer that adopts the method.
Background technology
Ozone is a kind of gas of strong oxidizing property, low latitude ozone is the secondary product of photochemical pollution, in Europe, through discovering, Harm of Ozone makes forest-tree produce sallow spot, bright green spot and causes brown point and blade necrosis, and the concentration of therefore accurately measuring ozone all is very important for the ozone concentration in reasonable use and control discharging tail gas and the environmental gas.
What traditional ozone analyzer adopted is based on chemical technology and the experimental analysis after absorbing sampling, and there is the measuring process complexity usually in these instruments, and man's activity is many, and experimental period is long, does not have the shortcoming of real-time.Comparatively speaking, optics and spectral remote sensing technology with its on a large scale, continuous real-time monitoring mode and become the ideal tools of ozone monitoring, analysis.Wherein difference absorption spectrum technology (DOAS) becomes the desired solution of ozone monitoring with outstanding method of testing and technical characterstic.
The fundamental measurement principle of DOAS is: send a branch of detection light from known luminaire, through gas to be measured, the gas with various molecule is to the absorption spectrum difference of light, make us to be come the analytical gas composition by the spectrum after the tested gas absorption by observing, the main thought of DOAS method is based on youth's primary-Beer law.
Summary of the invention
At problem set forth above, fundamental purpose of the present invention is to provide a kind of DOAS of use method on-line monitoring ozone concentration to change, study the online ozone analysis method of ozone spatial and temporal distributions.
The object of the present invention is achieved like this: a kind of online ozone analysis method, adopt following steps:
(1), at first in the background air, open light source by control IC, this background air is similar to the air that need carry out the ozone analysis and ozone concentration is known, after the detection light scioptics of light source output focus on, by first mirror reflects to collimation lens, by shine the terminal corner reflector of probe by the front window mirror, corner reflector returns light according to former road, reflected light is successively by the front window mirror, collimation lens, catoptron, launch light into grating through second catoptron and the 3rd catoptron again, grating reflexes to the 4th catoptron with light, light after the tested gas absorption of final process is detected device and receives, detector is transformed into electric signal with light signal and carries out front end and amplify, and this electric signal is transferred to control IC is stored as background spectrum.Background spectrum can obtain by the laboratory in the experiment condition strictness;
(2), in carrying out the air of ozone analysis, needs open light source by control IC again, after the detection light scioptics of light source output focus on, by first mirror reflects to collimation lens, by shine the terminal corner reflector of probe by the front window mirror, corner reflector returns light according to former road, reflected light is successively by the front window mirror, collimation lens, first catoptron, launch light into grating through second catoptron and the 3rd catoptron again, grating reflexes to the 4th catoptron with light, light after the tested gas absorption of final process is detected device and receives, detector is transformed into electric signal with light signal and carries out front end and amplify, and this electric signal is transferred to control IC is stored as crude sampling spectrum;
(3), control IC subtracts each other background spectrum and the crude sampling spectrum that records and be saved in storage unit in last two steps, obtain the spectrum after pretreated, this spectrum has comprised the dust in the atmosphere, the influence of optical surface filth etc., to the processing of taking the logarithm of pretreated spectrum, again spectrum is carried out fitting of a polynomial, separate in the spectrum because the low-frequency spectrum parts that influence caused such as atmospheric dust, what obtain then is exactly glitch-free spectrum after the gas absorption, by to comparing with regard to the reference spectra that is pre-stored in storage unit at first, be finally inversed by the concentration of ozone by using least square method.
Low in order to reduce operating cost, sampling analysis and data output also can be carried out by computing machine, step (3) can substitute, control IC give external computing machine with the background spectrum and the crude sampling spectrum that record and be saved in storage unit in last two steps by the I/O interface, computing machine subtracts each other background spectrum and crude sampling spectrum, obtain the spectrum after pretreated, this spectrum has comprised the dust in the atmosphere, the influence of optical surface filth etc., to the processing of taking the logarithm of pretreated spectrum, again spectrum is carried out fitting of a polynomial, separate in the spectrum because the low-frequency spectrum parts that influence caused such as atmospheric dust, what obtain then is exactly glitch-free spectrum after the gas absorption, by to comparing with regard to the reference spectra that is pre-stored in computing machine at first, be finally inversed by the concentration of ozone by using least square method.
The invention also discloses a kind of ozone analyzer, comprise casing, power supply, spectrum monitoring module, light source driving circuit, I/O interface, analog signal interface, display screen, man-machine inputting equipment, storage unit and control IC, wherein:
The spectrum monitoring module comprises light source, lens, first catoptron, collimation lens, front window mirror, corner reflector, second catoptron, the 3rd catoptron, grating, the 4th catoptron and detector composition, described light source and detector are at same end, and described detector is connected with control IC.
The preferred dsp processor of above-mentioned control IC, any one in preferred RS232 interface of above-mentioned I/O interface or the RS485 interface, the preferred touch-screen of above-mentioned man-machine inputting equipment, the preferred xenon source of above-mentioned light source, the preferred photoelectron diode array detector of above-mentioned detector.
In order to increase analyst coverage of the present invention, the 250-257nm wave band that the preferred ozone absorbing structure of the spectrum segment of above-mentioned light emitted is more intense.
The present invention is owing to the monitoring method that has adopted based on the DOAS principle, this method can realize on-line sampling, the representative of sample obviously improved, help sign to air quality, the spectrum segment that is detected is the more intense 250-257nm wave band of ozone absorbing structure, utilize differential technique can eliminate the influence of Atmospheric Flow, interference between the different pollutants and humidity, aerocolloidal interference to signal.Transmitting terminal and receiving end that the present invention will detect light are put in the same side, under the situation that keeps measurement performance not reduce, effectively shortened one times of light path, and be convenient to install, owing to can adopt the high pressure xenon short-act lamp as light source, it has high brightness, unusual points of proximity light source, effectively guaranteed the requirement of test macro to light source, the invention provides RS232/RS485/4-20mA, 0-5V output signal interface, has extraordinary signal compatibility function, the present invention can be with computer control and Controlled by Microcomputer drawing-in system, can make the sampling analysis Automatic Program carry out data transmission and control, operating cost is low, and sampling analysis and data output are by computer automatic execution, easy to operate, can adopt simultaneously liquid crystal touch screen to make user interface friendly more, can be used the composed atmosphere monitoring system, have extensive market prospects with Other Instruments.
Description of drawings
Fig. 1 is a method flow block diagram of the present invention.
Fig. 2 is the structural representation of spectrum monitoring module of the present invention.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is described in further detail.
Embodiment one:
A kind of this online ozone analyzer that uses carries out the method that ozone is analyzed, and adopts following steps:.
(1), at first in the background air, open xenon lamp 301 by dsp controller, this background air is similar to the air that need carry out the ozone analysis and ozone concentration is known, after the detection light of the 250-257nm wave band of xenon lamp 301 outputs focuses on by quartz lens 305, reflex on the collimation lens 302 by first catoptron 309, by shine the terminal corner reflector 304 of probe by quartzy front window mirror 303, corner reflector 304 returns light according to former road, reflected light is successively by quartzy front window mirror 303, collimation lens 302, first catoptron 309, launch light into grating 310 through second catoptron 306 and the 3rd catoptron 307 again, grating 310 reflexes to the 4th catoptron 308 with light, light after the tested gas absorption of final process is received by photoelectron diode array detector 311, photoelectron diode array detector 311 is transformed into electric signal with light signal and carries out front end and amplify, and simultaneously this electric signal is transferred to dsp controller and is stored as background spectrum.Background spectrum can obtain by the laboratory in the experiment condition strictness;
(2), in carrying out the air of ozone analysis, needs open xenon lamp 301 by dsp controller again, after the detection light of the 250-257nm wave band of xenon lamp 301 outputs focuses on by quartz lens 305, reflex on the collimation lens 302 by first catoptron 309, by shine the terminal corner reflector 304 of probe by quartzy front window mirror 303, corner reflector 304 returns light according to former road, reflected light is successively by quartzy front window mirror 303, collimation lens 302, first catoptron 309, launch light into grating 310 through second catoptron 306 and the 3rd catoptron 307 again, grating 310 reflexes to the 4th catoptron 308 with light, light after the tested gas absorption of final process is received by photoelectron diode array detector 311, photoelectron diode array detector 311 is transformed into electric signal with light signal and carries out front end and amplify, and this electric signal is transferred to control IC is stored as crude sampling spectrum;
(3), dsp controller subtracts each other background spectrum and the crude sampling spectrum that records and be saved in storage unit in last two steps, obtain the spectrum after pretreated, this spectrum has comprised the dust in the atmosphere, the influence of optical surface filth etc., to the processing of taking the logarithm of pretreated spectrum, again spectrum is carried out fitting of a polynomial, separate in the spectrum because the low-frequency spectrum parts that influence caused such as atmospheric dust, what obtain then is exactly glitch-free spectrum after the gas absorption, by to comparing with regard to the reference spectra that is pre-stored in storage unit at first, be finally inversed by the concentration of ozone by using least square method.
A kind of online ozone analyzer comprises casing, power supply, spectrum monitoring module, xenon lamp driving circuit, RS232 interface, analog signal interface, lcd touch display screen, storage unit and dsp controller, wherein:
The spectrum monitoring module comprises xenon lamp 301, quartz lens 305, first catoptron 309, collimation lens 302, quartzy front window mirror 303, corner reflector 304, second catoptron 306, the 3rd catoptron 307, grating 310, the 4th catoptron 308 and photoelectron diode array detector 311 compositions, described xenon lamp and photoelectron diode array detector are at same end, and described photoelectron diode array detector is connected with dsp controller.
Above-mentioned control IC preferred processor, any one in the preferred or RS485 interface of above-mentioned I/O interface, above-mentioned man-machine inputting equipment is preferred, above-mentioned light source preferred light source, the preferred detector of above-mentioned detector.
In order to increase analyst coverage of the present invention, the more intense 250-257nm of the preferred ozone absorbing structure of the spectrum segment of above-mentioned light emitted.
Embodiment two:
The structure of embodiment two is identical with embodiment one, and difference just in the step (3) of method is:
(3), dsp controller is given external computing machine with the background spectrum and the crude sampling spectrum that record and be saved in storage unit in last two steps by the RS232 interface, computing machine subtracts each other background spectrum and crude sampling spectrum, obtain the spectrum after pretreated, this spectrum has comprised the dust in the atmosphere, the influence of optical surface filth etc., to the processing of taking the logarithm of pretreated spectrum, again spectrum is carried out fitting of a polynomial, separate in the spectrum because the low-frequency spectrum parts that influence caused such as atmospheric dust, what obtain then is exactly glitch-free spectrum after the gas absorption, by to comparing with regard to the reference spectra that is pre-stored in computing machine at first, be finally inversed by the concentration of ozone by using least square method.
Claims (5)
1. online ozone analysis method is characterized in that adopting following steps:.
(1), at first by opening light source in the control IC background air, this background air is similar to the air that need carry out the ozone analysis and ozone concentration is known, after the detection light scioptics of light source output focus on, by first mirror reflects to collimation lens, by shine the terminal corner reflector of probe by the front window mirror, corner reflector returns light according to former road, reflected light is successively by the front window mirror, collimation lens, first catoptron, launch light into grating through second catoptron and the 3rd catoptron again, grating reflexes to the 4th catoptron with light, light after the tested gas absorption of final process is detected device and receives, detector is transformed into electric signal with light signal and carries out front end and amplify, and this electric signal is transferred to control IC is stored as background spectrum;
(2), in carrying out the air of ozone analysis, needs open light source by control IC again, after the detection light scioptics of light source output focus on, by first mirror reflects to collimation lens, by shine the terminal corner reflector of probe by the front window mirror, corner reflector returns light according to former road, reflected light is successively by the front window mirror, collimation lens, catoptron, launch light into grating through second catoptron and the 3rd catoptron again, grating reflexes to the 4th catoptron with light, light after the tested gas absorption of final process is detected device and receives, detector is transformed into electric signal with light signal and carries out front end and amplify, and this electric signal is transferred to control IC is stored as crude sampling spectrum;
(3), controlling IC at last subtracts each other background spectrum and the crude sampling spectrum that records and be saved in storage unit in last two steps, obtain the spectrum after pretreated, this spectrum has comprised the dust in the atmosphere, the influence of optical surface filth etc., to the processing of taking the logarithm of pretreated spectrum, again spectrum is carried out fitting of a polynomial, separate in the spectrum because the low-frequency spectrum parts that influence caused such as atmospheric dust, what obtain then is exactly glitch-free spectrum after the gas absorption, by to comparing with regard to the reference spectra that is pre-stored in storage unit at first, be finally inversed by the concentration of ozone by using least square method.
2. a kind of online ozone analysis method as claimed in claim 1, it is characterized in that: step (3) can substitute and is, control IC give external computing machine with the background spectrum and the crude sampling spectrum that record and be saved in storage unit in last two steps by the I/O interface, computing machine subtracts each other background spectrum and crude sampling spectrum, obtain the spectrum after pretreated, this spectrum has comprised the dust in the atmosphere, the influence of optical surface filth etc., to the processing of taking the logarithm of pretreated spectrum, again spectrum is carried out fitting of a polynomial, separate in the spectrum because the low-frequency spectrum parts that influence caused such as atmospheric dust, what obtain then is exactly glitch-free spectrum after the gas absorption, by to comparing with regard to the reference spectra that is pre-stored in computing machine at first, be finally inversed by the concentration of ozone by using least square method.
3. ozone analyzer is characterized in that: comprise casing, power supply, spectrum monitoring module, light source driving circuit, I/O interface, analog signal interface, display screen, man-machine inputting equipment, storage unit and control IC, wherein:
The spectrum monitoring module comprises light source, lens, first catoptron, collimation lens, front window mirror, corner reflector, second catoptron, the 3rd catoptron, grating, the 4th catoptron and detector composition, described light source and detector are at same end, and described detector is connected with control IC.
4. ozone analyzer as claimed in claim 3, it is characterized in that: the preferred dsp processor of described control IC, the preferred touch-screen of described man-machine inputting equipment, any one in preferred RS232 interface of described I/O interface or the RS485 interface, the preferred photoelectron diode array detector of described detector.
5. ozone analyzer as claimed in claim 3 is characterized in that: the preferred 250-257nm of the spectrum segment of described light emitted.
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| CN2009101096509A CN101706418B (en) | 2009-11-13 | 2009-11-13 | On-line ozone analysis method and ozone analyzer |
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| CN2009101096509A CN101706418B (en) | 2009-11-13 | 2009-11-13 | On-line ozone analysis method and ozone analyzer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406933A (en) * | 2014-11-28 | 2015-03-11 | 成都蓝宇科维科技有限公司 | Ozone detector based on ARM |
| CN105136683A (en) * | 2015-07-28 | 2015-12-09 | 安徽蓝盾光电子股份有限公司 | Long optical path air quality automatic monitoring system with remote quality control function |
-
2009
- 2009-11-13 CN CN2009101096509A patent/CN101706418B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406933A (en) * | 2014-11-28 | 2015-03-11 | 成都蓝宇科维科技有限公司 | Ozone detector based on ARM |
| CN105136683A (en) * | 2015-07-28 | 2015-12-09 | 安徽蓝盾光电子股份有限公司 | Long optical path air quality automatic monitoring system with remote quality control function |
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| CN101706418B (en) | 2011-05-18 |
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Effective date of registration: 20220511 Address after: 528000 No.8, Huishang Road, Jiangcun village, Leliu street, Shunde District, Foshan City, Guangdong Province Patentee after: Guangdong Yingfeng Technology Co.,Ltd. Address before: 518000 No. 301, block B, R & D building, Tsinghua hi tech Industrial Park, Nanshan District, Guangdong, Shenzhen Patentee before: UNIVERSTAR SCIENCE & TECHNOLOGY (SHENZHEN) Co.,Ltd. |