CN205229049U - Atmosphere OH radical measuring system - Google Patents
Atmosphere OH radical measuring system Download PDFInfo
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- CN205229049U CN205229049U CN201520983453.0U CN201520983453U CN205229049U CN 205229049 U CN205229049 U CN 205229049U CN 201520983453 U CN201520983453 U CN 201520983453U CN 205229049 U CN205229049 U CN 205229049U
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- test chamber
- laser beam
- measuring system
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Abstract
The utility model provides an atmosphere OH radical measuring system, including first laser instrument, detection chamber, fluorescence spectra detector, data processing device, the first laser beam incident that first laser instrument sent detect the chamber, it is filled with the gaseous sample to detect the intracavity, it is inspired fluorescence to detect intracavity OH free radical, fluorescence by the fluorescence spectra detector with data processing device carries out analysis processes, measurement system includes still that an ozone measuring device is used for measuring detect ozone concentration, a first light path adjustment piece and a second light path adjustment piece of intracavity.
Description
Technical field
The utility model relates to environmental monitoring field, especially aeromerric moasurenont field, is specially a kind of air hydroxyl (OH) radical measuring system.
Background technology
Aeromerric moasurenont has great importance to environmental protection.OH free radical is most important oxygenant in air, in the air of troposphere nearly all can be oxidized trace gas mainly by with OH free radical reaction and be converted and remove, OH free radical reaction provides to the micro constitutent of nature and anthropogenic discharge the important mechanisms transforming and remove in troposphere.Therefore, the surveying work of OH free radical is significant for environmental protection, but in air, the concentration of OH free radical is extremely low by (10
5~ 10
6molecule/cm
3), and can produce violent change along with space-time, therefore the OH free radical measured in air is a great challenge always exactly.
In current detection air, the method for OH free radical has multiple, such as laser Induced Fluorescence Technology (LIF), radioactivity
14cO technology, gas flaring laser Induced Fluorescence Technology (FAGE), difference absorption spectrum technology (DOAS), chemical ion mass spectrum (CIMS).
Wherein laser Induced Fluorescence Technology (LIF), gas flaring laser Induced Fluorescence Technology (FAGE), difference absorption spectrum technology (DOAS) is all direct measuring, the gas auxiliary without the need to other or liquid, but difference absorption spectrum technology (DOAS) is compared to wherein laser Induced Fluorescence Technology (LIF), gas flaring laser Induced Fluorescence Technology (FAGE) its detection sensitivity is low, and laser Induced Fluorescence Technology (LIF), gas flaring laser Induced Fluorescence Technology (FAGE) can generate OH due to laser and ozone generation photolysis again, therefore the accuracy that it detects can be affected.
Utility model content
The purpose of this utility model is, solves conventional art and directly measures the low problem of Atmospheric OH Radical Using sensitivity, accuracy.
The purpose of this utility model realizes by the following technical solutions.
A kind of atmosphere OH radical measuring system, comprise the first laser instrument, test chamber, fluorescence spectrum detecting device, data processing equipment, the incident described test chamber of the first laser beam that described first laser instrument sends, gaseous sample is filled with in described test chamber, in described test chamber, OH free radical is inspired fluorescence, described fluorescence carries out analyzing and processing to obtain the OH number of free radical in described test chamber by described fluorescence spectrum detecting device and described data processing equipment, described measuring system also comprises an ozone measurement mechanism for measuring the ozone concentration in described test chamber, a first light path adjustment part and a second light path adjustment part, wherein, described ozone-detecting element comprises:
A second laser, its second laser beam sent enters described test chamber, and the wavelength of described second laser beam is in the absorption peak of ozone;
A detector, is positioned at the light emission side of described test chamber, and for receiving described second laser beam, described detector is electrically connected with a prime amplifier, a lock-in amplifier and a data collecting card successively; And
A chopper, is positioned at the bright dipping light path of described second laser, and is connected with described lock-in amplifier, for modulating described second laser beam;
Described first light path adjustment part is positioned at the incident side of described test chamber, for guiding in described test chamber by first, second laser beam described;
Described second light path adjustment part, is positioned at the light emission side of described test chamber, for guiding described second laser beam into described detector.
In another embodiment of the utility model, comprise a light reflecting element further, described smooth reflecting element and the laser beam both sides of described fluorescence spectrum detecting device respectively in described test chamber, described smooth reflecting element is used for described fluorescent reflection to described fluorescence spectrum detecting device.
In another embodiment of the utility model, comprise a nozzle further, with described smooth reflecting element the same side in described test chamber, for described gaseous sample is sprayed into described test chamber.
In another embodiment of the utility model, first, second light path adjustment part described is prism, first, second laser beam irradiation described to the surface of described prism be equipped with reflectance coating.
In another embodiment of the utility model, first, second light path adjustment part described is dichroic mirror, and it has high-transmission rate to described first laser beam, has high reflectance to described second laser beam.
In another embodiment of the utility model, incident side and the light emission side of described test chamber are provided with Brewster angle window, make first, second laser beam described with test chamber described in brewster angle incidence.
In another embodiment of the utility model, described test chamber is a long light path chamber, and light emission side and incident side are equipped with catoptron and make first, second laser beam described multiple reflections back and forth in described test chamber.
In another embodiment of the utility model, described fluorescence spectrum detecting device comprises monochromator, photomultiplier and Boxcar counter.
In another embodiment of the utility model, the wavelength of described first laser instrument is 282nm or 308nm, and the wavelength of described second laser is 310nm ~ 440nm or 440nm ~ 740nm.
Compared to prior art, the utility model is in conjunction with laser Induced Fluorescence Technology and tunable diode laser absorption spectrometry technology, by the ozone concentration in laser measurement test chamber and total OH number of free radical, indirect inspection gaseous sample OH number of free radical originally, eliminate ozone under the laser beam photodissociation be the interference of OH free radical, therefore whole measuring system has higher sensitivity and accuracy.
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to technological means of the present utility model can be better understood, and can be implemented according to the content of instructions, and can become apparent to allow above and other object of the present utility model, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the structural representation of the atmosphere OH radical measuring system that the utility model first embodiment provides.
Fig. 2 is the structural representation of the atmosphere OH radical measuring system that the utility model second embodiment provides.
Embodiment
For the ease of understanding the utility model, below with reference to relevant drawings, the utility model is described more fully.Better embodiment of the present utility model is given in accompanying drawing.But the utility model can realize in many different forms, is not limited to embodiment described herein.On the contrary, provide the object of these embodiments be make to disclosure of the present utility model understand more thorough comprehensively.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model understand usually.The object of the term used in instructions of the present utility model herein just in order to describe concrete embodiment, is not intended to be restriction the utility model.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Please refer to Fig. 1, Fig. 1 is the structural representation of the atmosphere OH radical measuring system that the utility model first embodiment provides, described measuring system comprises first laser instrument 10, test chamber 12, fluorescence spectrum detecting device 14, data processing equipment 16 and an ozone measurement mechanism 100, prism 31 and a prism 32.
The incident test chamber 12 of the first laser beam that first laser instrument 10 sends, gaseous sample is filled with in test chamber 12, in test chamber 12, OH free radical is inspired fluorescence, and fluorescence obtains the OH number of free radical in test chamber 12 after carrying out analyzing and processing by fluorescence spectrum detecting device 14 and data processing equipment 16.
Particularly, first laser instrument 10 can centered by wavelength be the pulsed laser of about 282nm, repetition frequency can be 10Hz, and pulsewidth can be the laser instrument of 308nm for 5ns (also can be other parameters) or centre wavelength, and its effect excites OH free radical to make it that fluorescence occur.
Incide in test chamber 12 after the light that first laser instrument 10 is launched is reflected by prism 31.The side of this test chamber 12 is provided with nozzle 40, and its effect is that outside air or gaseous sample are ejected in test chamber 12.
Fluorescence spectrum detecting device 14 mainly comprises monochromator 141, photomultiplier 142 and Boxcar counter 143.Preferably, the measuring system that the present embodiment provides also comprises a light reflecting element 50.Light reflecting element 50 is positioned at test chamber 12, and monochromator 141 is oppositely arranged, and with nozzle 40 in the same side, i.e. the light path both sides of light reflecting element 50 and the laser beam of monochromator 141 respectively in test chamber 12.
When the air that the first laser beam is sprayed through nozzle 40, the OH free radical stimulate in test chamber 12 is gone out fluorescence, fluorescence is received by monochromator 141.Light reflecting element 50 in monochromator 141, can improve collecting efficiency the fluorescent reflection dispersed towards it.Light reflecting element 50 can be a catoptron particularly.
OH free radical has the fluorescence spectrum of transmitting at about 313nm, the effect of monochromator 141 mainly its all band of elimination light and only allow the emitting fluorescence of OH free radical pass through, then by photomultiplier 142, then gathered by Boxcar counter 143.Data processing equipment 16 can be computing machine.Finally obtain OH number of free radical in test chamber 12 by Computer Analysis fluorescence spectrum.
Can be sheltered from by a shutter 60 after first laser beam injection test chamber 12.
Ozone measurement mechanism 100 mainly comprises a second laser 20, detector 21, chopper 23, prime amplifier 24, lock-in amplifier 25 and a data collecting card 26.
The second laser beam that second laser 20 sends enters test chamber 12, and the wavelength of the second laser beam is in the absorption peak of ozone.
The second laser beam that second laser 20 sends guides test chamber 12 by after chopper 23 chopping modulation that is positioned at its bright dipping light path into by prism 31, the chopping frequency of chopper 23 is input in lock-in amplifier 25, second laser beam of injection test chamber 12 reflexes in detector 21 by prism 32, detector 21 detects signal and is input in lock-in amplifier 25 by after prime amplifier 24 amplifying signal, and last signal is gathered by data collecting card 26.
The wavelength of second laser 20 can between 310nm ~ 440nm, this interval is the weak absorbing band of ozone, the absorption region that absorption band is made up of a series of absorption peak, as long as the energy of laser instrument is enough strong, just can detect the absorption peak of weak absorbing band, just can detect ozone concentration; Also can between 440nm ~ 740nm, this interval is the ultraviolet/visible light absorption band of ozone.Second laser 20 can be continuous laser, also can be pulse laser, and its wavelength is in some absorption peak places of ozone, because ozone photolysis can occur when wavelength is less than 310nm, so the wavelength of second laser 20 should be greater than 310nm.
When ozone concentration one timing, by specific wavelength, such as, when the laser of 282nm irradiates, its photodissociation is the concentration of OH free radical is also known, and its detection method can be obtained by following several method accurately detecting: Active oxygen radical method, high performance liquid chromatography etc., repeat no more herein.
In the present embodiment, prism 31,32 respectively as first, second light path adjustment part, first, second laser beam irradiation to the surface of prism 31,32 be equipped with reflectance coating (not shown) to reflect first, second laser beam.Prism 31 is positioned at the incident side of test chamber 12, enters in test chamber 12 for first, second laser beam being combined into more close two-beam line reflection.Prism 32 is positioned at the light emission side of test chamber 12, this two-beam line separately, by the first laser beam reflection to shutter 60, by the second laser beam reflection to detector 21.
Preferably, incident side and the light emission side of test chamber 12 are provided with Brewster angle window, and namely the lens of incident side and light emission side arrange and first, second laser beam will be made with brewster angle incidence test chamber 12, to reduce light loss.
Refer to Fig. 2, Fig. 2 is the structural representation of the atmosphere OH radical measuring system that the utility model second embodiment provides, and it is substantially identical with the measuring system that the first embodiment provides, and difference is 2 points:
1, by dichroic mirror 81 and dichroic mirror 82 respectively as first, second light path adjustment part, it all has high-transmission rate to the first laser beam, has high reflectance to the second laser beam.
2, test chamber 22 is a long light path chamber, light emission side and incident side are equipped with catoptron 70 and make first, second laser beam multiple reflections back and forth in test chamber 22, namely laser can in cavity roundtrip thus increase absorb light path, thus can detection sensitivity be increased, this cavity can be Herroit type absorption cell, also can be White type absorption cell.
Compared to prior art, the utility model is in conjunction with laser Induced Fluorescence Technology and tunable diode laser absorption spectrometry technology, by the ozone concentration in laser measurement test chamber and total OH number of free radical, indirect inspection gaseous sample OH number of free radical originally, eliminate ozone under the laser beam photodissociation be the interference of OH free radical, therefore whole measuring system has higher sensitivity and accuracy.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (9)
1. an atmosphere OH radical measuring system, comprise the first laser instrument, test chamber, fluorescence spectrum detecting device, data processing equipment, the incident described test chamber of the first laser beam that described first laser instrument sends, gaseous sample is filled with in described test chamber, in described test chamber, OH free radical is inspired fluorescence, described fluorescence carries out analyzing and processing to obtain the OH number of free radical in described test chamber by described fluorescence spectrum detecting device and described data processing equipment, it is characterized in that, described measuring system also comprises an ozone measurement mechanism for measuring the ozone concentration in described test chamber, a first light path adjustment part and a second light path adjustment part, wherein, described ozone-detecting element comprises:
A second laser, its second laser beam sent enters described test chamber, and the wavelength of described second laser beam is in the absorption peak of ozone;
A detector, is positioned at the light emission side of described test chamber, and for receiving described second laser beam, described detector is electrically connected with a prime amplifier, a lock-in amplifier and a data collecting card successively; And
A chopper, is positioned at the bright dipping light path of described second laser, and is connected with described lock-in amplifier, for modulating described second laser beam;
Described first light path adjustment part is positioned at the incident side of described test chamber, for guiding in described test chamber by first, second laser beam described;
Described second light path adjustment part, is positioned at the light emission side of described test chamber, for guiding described second laser beam into described detector.
2. measuring system as claimed in claim 1, it is characterized in that: comprise a light reflecting element further, the light path both sides of described smooth reflecting element and the laser beam of described fluorescence spectrum detecting device respectively in described test chamber, described smooth reflecting element is used for described fluorescent reflection to described fluorescence spectrum detecting device.
3. measuring system as claimed in claim 2, is characterized in that: comprise a nozzle further, with described smooth reflecting element the same side in described test chamber, for described gaseous sample is sprayed into described test chamber.
4. measuring system as claimed in claim 1, is characterized in that: first, second light path adjustment part described is prism, first, second laser beam irradiation described to the surface of described prism be equipped with reflectance coating.
5. measuring system as claimed in claim 1, is characterized in that: first, second light path adjustment part described is dichroic mirror, and it has high-transmission rate to described first laser beam, has high reflectance to described second laser beam.
6. measuring system as claimed in claim 1, is characterized in that: incident side and the light emission side of described test chamber are provided with Brewster angle window, makes first, second laser beam described with test chamber described in brewster angle incidence.
7. measuring system as claimed in claim 1, is characterized in that: described test chamber is a long light path chamber, and light emission side and incident side are equipped with catoptron and make first, second laser beam described multiple reflections back and forth in described test chamber.
8. measuring system as claimed in claim 1, is characterized in that: described fluorescence spectrum detecting device comprises monochromator, photomultiplier and Boxcar counter.
9. measuring system as claimed in claim 1, it is characterized in that: the wavelength of described first laser instrument is 282nm or 308nm, the wavelength of described second laser is 310nm ~ 440nm or 440nm ~ 740nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520983453.0U CN205229049U (en) | 2015-12-02 | 2015-12-02 | Atmosphere OH radical measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520983453.0U CN205229049U (en) | 2015-12-02 | 2015-12-02 | Atmosphere OH radical measuring system |
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| CN205229049U true CN205229049U (en) | 2016-05-11 |
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| CN201520983453.0U Withdrawn - After Issue CN205229049U (en) | 2015-12-02 | 2015-12-02 | Atmosphere OH radical measuring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105300952A (en) * | 2015-12-02 | 2016-02-03 | 南京先进激光技术研究院 | Atmosphere OH free radical measurement system and method |
| CN106325317A (en) * | 2016-11-10 | 2017-01-11 | 桂林电子科技大学 | System for OH free radical gas generation and concentration control |
| CN108120681A (en) * | 2017-12-20 | 2018-06-05 | 中国科学院合肥物质科学研究院 | A kind of measurement HO2Transfer efficiency and RO2The apparatus and method for disturbing size |
-
2015
- 2015-12-02 CN CN201520983453.0U patent/CN205229049U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105300952A (en) * | 2015-12-02 | 2016-02-03 | 南京先进激光技术研究院 | Atmosphere OH free radical measurement system and method |
| CN105300952B (en) * | 2015-12-02 | 2018-05-25 | 南京先进激光技术研究院 | Atmosphere OH radical measuring system and method |
| CN106325317A (en) * | 2016-11-10 | 2017-01-11 | 桂林电子科技大学 | System for OH free radical gas generation and concentration control |
| CN108120681A (en) * | 2017-12-20 | 2018-06-05 | 中国科学院合肥物质科学研究院 | A kind of measurement HO2Transfer efficiency and RO2The apparatus and method for disturbing size |
| CN108120681B (en) * | 2017-12-20 | 2020-05-01 | 中国科学院合肥物质科学研究院 | Measurement HO2Conversion efficiency and RO2Apparatus and method for interference magnitude |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160511 Effective date of abandoning: 20180525 |
|
| AV01 | Patent right actively abandoned |