CN109856065A - Hydroxy radical reactivity measuring device - Google Patents
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- CN109856065A CN109856065A CN201910000596.8A CN201910000596A CN109856065A CN 109856065 A CN109856065 A CN 109856065A CN 201910000596 A CN201910000596 A CN 201910000596A CN 109856065 A CN109856065 A CN 109856065A
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/631—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited using photolysis and investigating photolysed fragments
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Abstract
The invention discloses a kind of hydroxy radical reactivity measuring devices.It includes the light switching part in Distributed Feedback Laser (1) and its optical path, polarised light converting member, photochemical reaction component, ultraviolet photolysis component, phase detecting section and exploring block, it also includes the reference cell (4) by being located on infrared light path, first analyzer (16) and reference detector (17), and the first lock-in amplifier (18) being sequentially connected electrically with reference detector (17), proportional plus integral plus derivative controller (19), the frequency locking component of adder (20) and laser controller (21) composition, its ultraviolet photolysis component is the 5th reflecting mirror (14) being successively equipped on ultraviolet laser (12) and its UV light path, beam expanding lens (15), second calcirm-fluoride window (614), second pond internal reflector (612), first pond internal reflector (611) and One calcirm-fluoride window (613).It is extremely easy to widely commercial applications in the real―time precision measurment to hydroxy radical reactivity.
Description
Technical field
The present invention relates to a kind of reactivity measuring device, especially a kind of hydroxy radical reactivity measuring device.
Background technique
Hydroxy radical (OH) is most important oxidant in atmosphere, it determines the generation of major pollutants in atmosphere and goes
It removes, concentration level is an important measurement of local atmospheric oxidn ability, is the core for determining atmosphere pollution and being formed.Currently,
People have made some good tries and effort, such as Chinese invention patent application CN 108169218A to measure hydroxy radical
In a kind of hydroxy radical in-situ measurement system for the applicant that on June 15th, 2018 announces.The measuring system includes 2.8um's
Collimation polarization optical assembly on Distributed Feedback Laser (distributed feedback laser) and its optical path, photochemical reaction cabin, polarised light conversion
Component and detection device, wherein photochemical reaction cabin is successively to be set with more ultraviolet lamps and spiral form outside optics multi-pass pond
Both ends in magnet, pond are equipped with the reflecting mirror with light well and light hole, and optics multi-pass is communicated with sample feeding pipe and exhaust pipe on pond；
When measurement, after the collimated polarization optical assembly of laser, the collimation polarised light of formation passes through the multiple anti-of optics multi-pass pond internal reflector
It penetrates, detection signal is converted by detection device after the processing of polarised light transition components again after outgoing.This measuring system can only be surveyed
Determine the concentration of OH, and the reactivity of OH cannot be measured；The conversion process of OH is extremely complex in atmosphere, reactivity and service life
It being inversely proportional, description OH total oxidation removal ability reflects generation and the wear rate of OH, is the core parameter that OH shifts to new management mechanisms,
Therefore to the directly measurement of OH reactivity to furtheing investigate its reaction mechanism, raising Atmospheric models accuracy and to atmosphere pollution
Reply have great importance with prevention and treatment.
Summary of the invention
The technical problem to be solved in the present invention is to provide one kind in place of overcoming shortcoming in the prior art and be capable of measuring hydroxyl freedom
The hydroxy radical reactivity measuring device of base reactivity.
To solve technical problem of the invention, used technical solution is hydroxy radical reactivity measuring device packet
Include light switching part, the polarised light converting member, photochemical reaction portion on 2.8 μm of wavelength of Distributed Feedback Laser and its infrared light path
Part, ultraviolet photolysis component, phase detecting section and exploring block, especially:
The measuring device also includes frequency locking component, and the frequency locking component is by the ginseng on Distributed Feedback Laser infrared light path
Examine pond, the first analyzer and reference detector, and be sequentially connected electrically with reference detector the first lock-in amplifier, ratio product
Divide derivative controller, adder and laser controller composition, the self-reference sinusoidal signal output of the first lock-in amplifier therein
End is electrically connected with the input terminal of adder, and the output end of laser controller is electrically connected with Distributed Feedback Laser, for by 2.8 μm of DFB
The wavelength locking of laser output is in hydroxy radical absorption peak 3568.5238cm-1Place；
The photochemical reaction component is measuring cell, and the measuring cell is that direct current spiral shell is set with outside cylindric multiple reflecting pool
Both ends are equipped with the first pond internal reflector and the second pond internal reflector of same optical axis respectively in spool magnet, pond, multiple reflecting pool
Both ends of the surface are equipped with the first calcirm-fluoride window respectively and the second calcirm-fluoride window, both ends are equipped with provide into multiple reflecting pool respectively
The air inlet and air outlet of laminar condition gaseous sample, wherein the first pond internal reflector and the second pond internal reflector are ring-type
Concave spherical mirror, and it is equipped with light well and light hole respectively thereon；
The ultraviolet photolysis component is the 5th reflecting mirror being successively equipped on ultraviolet laser and its UV light path, expands
Mirror, the second calcirm-fluoride window, the second pond internal reflector, the first pond internal reflector and the first calcirm-fluoride window are used for photodissociation ozone
Excited oxygen atom is generated to generate hydroxy radical；
The smooth switching part be placed in it is semi-transparent semi-reflecting on the infrared light path between Distributed Feedback Laser and light well, reference cell
Mirror, and the second reflecting mirror and condenser lens that are placed on the infrared light path between light hole and infrared detector；
The polarised light converting member is the polarizer being placed between Distributed Feedback Laser and semi-transparent semi-reflecting lens, be placed in reference cell with
The first analyzer between reference detector, and the second analyzer being placed between the second reflecting mirror and condenser lens；
The phase detecting section is electrically connected the first lock-in amplifier and infrared detector, output end electricity by input terminal
The second lock-in amplifier and output end for connecting computer are electrically connected the digital delay hair of ultraviolet laser and computer
Raw device composition, for being sent into computer after demodulating the signal same-phase of the signal of infrared detector and reference detector, and
The pulse daley of ultraviolet laser is controlled, and simultaneously send trigger signal to computer, the zero point to guarantee time of measuring is unified
And record hydroxy radical activity declines and swings the baseline of signal；
The exploring block is the infrared detector for being placed in condenser lens focal point, and is placed in the first analyzer optical path
Reference detector.
Further improvement as hydroxy radical reactivity measuring device:
Preferably, the surface of cyclic annular concave spherical mirror is coated with golden film or silverskin or deielectric-coating.
Preferably, the diameter of two cyclic annular concave spherical mirrors is 50mm, center first in annular distance and second
The diameter of annular distance is 30mm.
Preferably, the bore dia of light well and light hole is 5mm, is respectively positioned on the inner ring of cyclic annular concave spherical mirror
Side, and in non-same optical axis setting.
Preferably, Nd:YAG pulse laser of the ultraviolet laser for output wavelength 266nm, flash frequency≤5/tHz,
T therein is the time swap of gaseous sample.
Preferably, ultraviolet hot spot diameter≤ring-type concave spherical mirror inner ring bore dia after beam expanding lens expands.
Preferably, the first reflecting mirror is equipped between Distributed Feedback Laser and the polarizer.
Preferably, third reflecting mirror is equipped between the second reflecting mirror and the second analyzer.
Preferably, the 4th reflecting mirror is equipped between ultraviolet laser and the 5th reflecting mirror.
Preferably, the surface of the 4th reflecting mirror and the 5th reflecting mirror is coated with that 532nm is anti-reflection and the anti-two point medium of 266nm high
Film.
Beneficial effect compared with the existing technology is:
With such a structure, the wavelength locking that both can have steadily exported infrared Distributed Feedback Laser is inhaled in hydroxy radical
Receive peak 3568.5238cm-1Place, from the influence of laser frequency drift；To be expanded while increasing infrared acquisition light path again after
Ultraviolet photolysis pulsed light introduce, and it is it is be overlapped as far as possible with infrared acquisition light swash so that ultraviolet light photodissociation ozone generates
Hair state oxygen atom is arrived by infrared light detecting while the hydroxy radical energy transient state generated is reacted with gas phase water, is effectively prevented from and is inhibited
The extending influence of hydroxy radical, the interference of the atmospheric background and chemical conversion interference in measurement process；Also set ultraviolet laser
Pulse daley has recorded the complete baseline of hydroxy radical, generates rising edge and the process of swinging that declines, to realize to hydroxy radical
Generate the measurement with the sub- millisecond time frame of consumption process；More have the characteristics that at low cost, measurement accuracy is high, and then makes
The present invention be extremely easy to widely commercial applications in the real―time precision measurment to hydroxy radical reactivity.
Realization mechanism of the invention are as follows:
Ozone (O of the atmospheric sample in multiple reflecting pool after by the ultraviolet light beam irradiation of wavelength 266nm, in background3)
Just by photodissociation generate oxygen atom (O (1D)), oxygen atom (O (1D)) with background in steam (H2O) reaction generates hydroxy radical, tool
The reaction process of body is as follows:
The hydroxy radical that photodissociation generates can measure hydroxy radical concentration declining at any time at once with other reactant reactions
Subtract, can realize the measurement to hydroxy radical reactivity:
[OH]=[OH] × exp (- k'OHT),
[OH] indicates hydroxy radical concentration, k' in above formulaOHIndicate hydroxy radical reactivity to be measured.
Detailed description of the invention
Fig. 1 is a kind of basic structure schematic diagram of the invention.
Fig. 2 is the methane (CH of the hydroxy radical and various concentration that are obtained using the present invention4) hydroxyl that obtains after gas reaction
Radical reaction activity measurement figure.Abscissa in figure is the time, ordinate is signal strength --- represent the dense of hydroxy radical
Degree.As can be seen from Figure, the ultraviolet pulse photopolymerization initiation in 30ms, flash frequency are set as 1Hz, and hydroxy radical signal curve occurs anxious
Speed increases, and is only 4.5ms to reach to peak value time-consuming, and the device response time of this example is 300us, ensure that enough data points are come
Reflect this process rapidly generated；Just start and CH after hydroxy radical generates4Gas reacts, and concentration signal value refers to
Number attenuation change, CH4Gas concentration is higher, and OH decaying is faster.CH4Decaying when gas is 0 represents damaging certainly for the OH of device
Consumption.OH and various concentration CH are just obtained by exponential fitting attenuation curve4The active k' of gas reactionOH, and can also be further
Obtain reaction rate constant.The example sufficiently demonstrates of the invention true feasible.
Specific embodiment
Preferred embodiment of the invention is described in further detail with reference to the accompanying drawing.
Referring to Fig. 1, the composition of hydroxy radical reactivity measuring device is as follows:
The present invention includes that light switching part, the polarised light on 2.8 μm of wavelength of Distributed Feedback Laser 1 and its infrared light path are converted
Component, photochemical reaction component, ultraviolet photolysis component, phase detecting section and exploring block and frequency locking component；Wherein:
Frequency locking component is by reference cell 4, the first analyzer 16 and the reference detector on 1 infrared light path of Distributed Feedback Laser
17, and the first lock-in amplifier 18, the proportional plus integral plus derivative controller 19, adder that are sequentially connected electrically with reference detector 17
20 and laser controller 21 form, 25 output end of self-reference sinusoidal signal of the first lock-in amplifier 18 therein and adder 20
Input terminal electrical connection, the output end of laser controller 21 is electrically connected with Distributed Feedback Laser 1.
Photochemical reaction component is measuring cell 6, which is to be set with direct current helical outside cylindric multiple reflecting pool 61
Both ends are equipped with the first pond internal reflector 611 and the second pond internal reflector 612 of same optical axis respectively in pipe magnet 62, pond, repeatedly anti-
The both ends of the surface for penetrating pond 61 are equipped with the first calcirm-fluoride window 613 respectively and the second calcirm-fluoride window 614, both ends are equipped with respectively to more
Air inlet 615 and the gas outlet 616 of laminar condition gaseous sample are provided in secondary reflection pond 61, wherein the first pond internal reflector 611
It is cyclic annular concave spherical mirror with the second pond internal reflector 612, and is equipped with light well 6112 and light hole 6122 respectively thereon；
The surface of ring-type concave spherical mirror therein is coated with golden film (or silverskin or deielectric-coating), two cyclic annular concave spherical mirrors
Diameter is 50mm, center first in annular distance 6111 and second diameter of annular distance 6121 be 30mm, light well 6112
Bore dia with light hole 6122 is 5mm, is respectively positioned on the inner ring side of cyclic annular concave spherical mirror, and set in non-same optical axis
Set --- not in same optical axis.
Ultraviolet photolysis component is the 5th reflecting mirror 14, the beam expanding lens being successively equipped on ultraviolet laser 12 and its UV light path
15, the second calcirm-fluoride window 614, the second pond internal reflector 612, the first pond internal reflector 611 and the first calcirm-fluoride window 613；
Wherein, ultraviolet laser 12 is the Nd:YAG pulse laser of output wavelength 266nm, flash frequency≤5/tHz, t therein
For the time swap of gaseous sample, flash frequency is now set as 1Hz, ultraviolet hot spot diameter≤ring-type after beam expanding lens 15 expands is recessed
The inner ring bore dia of spherical reflector, is now set as 28mm.
Light switching part is semi-transparent half be placed on the infrared light path between Distributed Feedback Laser 1 and light well 6112, reference cell 4
Anti- mirror 3, and the second reflecting mirror 7 and condenser lens that are placed on the infrared light path between light hole 6122 and infrared detector 11
10。
Polarised light converting member is the polarizer 5 being placed between Distributed Feedback Laser 1 and semi-transparent semi-reflecting lens 3, be placed in reference cell 4 with
The first analyzer 16 between reference detector 17, and the second analyzer 9 being placed between the second reflecting mirror 7 and condenser lens 10.
Phase detecting section is electrically connected the first lock-in amplifier 18 and infrared detector 11, output end electricity by input terminal
The second lock-in amplifier 22 and output end that connect computer 24 are electrically connected the number of ultraviolet laser 12 and computer 24
Word delay time generator 23 forms.
Exploring block is the infrared detector 11 for being placed in 10 focal point of condenser lens, and is placed in 16 optical path of the first analyzer
On reference detector 17.
To be equipped with the first reflecting mirror 2 between Distributed Feedback Laser 1 and the polarizer 5 convenient for installation and debugging of the invention, second is anti-
It penetrates between mirror 7 and the second analyzer 9 and is equipped with third reflecting mirror 8, the 4th reflection is equipped between ultraviolet laser 12 and the 5th reflecting mirror 14
Mirror 13.
To obtain the ultraviolet light of better quality and avoiding the interference of stray light, the 4th reflecting mirror 13 and the 5th reflecting mirror 14
Surface is coated with that 532nm is anti-reflection and the anti-two point deielectric-coating of 266nm high.
Referring to Fig. 1 and Fig. 2, the measurement process of hydroxy radical reactivity measuring device is as follows:
2.8 μm of detection light that Distributed Feedback Laser 1 issues become after the first reflecting mirror 2, the polarizer 5 and semi-transparent semi-reflecting lens 3
Two-way linearly polarized light.The high concentration OH that linearly polarized light all the way therein enters in reference cell 4 and pond through semi-transparent semi-reflecting lens 3 is acted on
After be emitted, emergent light be referenced after the first analyzer 16 detector 17 reception；The electric signal converted through reference detector 17 into
Enter the first lock-in amplifier 18, proportional plus integral plus derivative controller 19 is sent by the harmonic signal 26 that it is demodulated, by 2.8
μm Distributed Feedback Laser 1 export wavelength locking in hydroxy radical absorption peak 3568.5238cm-1Place；Through proportional integral differential control
Feedback signal after device 19 processed acts on accesses adder 20, while the self-reference sinusoidal signal 25 of the first lock-in amplifier 18 is simultaneously
Adder 20 is accessed, adder 20 is sent into laser controller 21 after synthesizing feedback signal and self-reference sinusoidal signal 25, to control
The locking frequency of Distributed Feedback Laser 1 processed.
Reflection of the another way linearly polarized light through semi-transparent semi-reflecting lens 3 is entered by the first calcirm-fluoride window 613 and light well 6112
In cylindric multiple reflecting pool 61 in measuring cell 6, with the laminar condition gas sample provided by air inlet 615 and gas outlet 616
Product contact, and simultaneously in the magnetic field of direct current solenoid magnet 62, and passed through later by the Nd:YAG pulse laser of wavelength 266nm
What the 4th reflecting mirror 13, the 5th reflecting mirror 14 and beam expanding lens 15 provided generates excited oxygen atom for photodissociation ozone to generate hydroxyl
Under the collective effect of the ultraviolet light of free radical, in pond between the first pond of both ends internal reflector 611 and the second pond internal reflector 612
After multiple reflections, the emergent light for carrying hydroxy radical signal is emitted via light hole 6122 and the second calcirm-fluoride window 614,
And through the second reflecting mirror 7, third reflecting mirror 8, the second analyzer 9 and condenser lens 10, infrared detector 11 is arrived at.
The second lock-in amplifier 22 in phase detecting section will be believed from the self-reference sine of the first lock-in amplifier 18
Numbers 25 access as External Reference signals, to demodulate the hydroxy radical signal that infrared detector 11 is sent --- by infrared detector 11
Signal and reference detector 17 signal same-phase demodulation, and by result be sent into computer 24.Digital delay generator 23 exists
While controlling the delay triggering of ultraviolet laser 12, trigger signal is sent into computer 24, to guarantee the zero point system of time of measuring
One and record hydroxy radical activity decline and swing the baseline of signal.
The result and receive the triggering that digital delay generator 23 is sent that computer 24 is sent by the second lock-in amplifier 22
After signal, according to formula [OH]=[OH] × exp (- k'OHT), the reactivity of hydroxy radical is obtained.Base makes in this present embodiment
Reaction gas is methane, therefore obtains the reactivity measurement figure of hydroxy radical as shown in Figure 2.
Obviously, those skilled in the art can carry out various change to hydroxy radical reactivity measuring device of the invention
Dynamic and modification is without departing from the spirit and scope of the present invention.If in this way, belonging to this hair to these modifications and changes of the present invention
Within the scope of bright claim and its equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of hydroxy radical reactivity measuring device, including on 2.8 μm of wavelength of Distributed Feedback Laser (1) and its infrared light path
Light switching part, polarised light converting member, photochemical reaction component, ultraviolet photolysis component, phase detecting section and probe portion
Part, it is characterised in that:
The measuring device also includes frequency locking component, and the frequency locking component is by the reference on Distributed Feedback Laser (1) infrared light path
Pond (4), the first analyzer (16) and reference detector (17), and the first locking phase being sequentially connected electrically with reference detector (17)
Amplifier (18), proportional plus integral plus derivative controller (19), adder (20) and laser controller (21) composition, the first lock therein
Self-reference sinusoidal signal (25) output end of phase amplifier (18) is electrically connected with the input terminal of adder (20), laser controller
(21) output end is electrically connected with Distributed Feedback Laser (1), and the wavelength locking for exporting 2.8 μm of Distributed Feedback Laser (1) is in hydroxyl
Free radical absorption peak 3568.5238cm-1Place；
The photochemical reaction component is measuring cell (6), and the measuring cell (6) is to be set with outside cylindric multiple reflecting pool (61)
Both ends are equipped with the first pond internal reflector (611) and the second pond internal reflection of same optical axis respectively in direct current solenoid magnet (62), pond
Mirror (612), the both ends of the surface of multiple reflecting pool (61) are equipped with the first calcirm-fluoride window (613) and the second calcirm-fluoride window respectively
(614), both ends, which are equipped with respectively into multiple reflecting pool (61), provides the air inlet (615) and outlet of laminar condition gaseous sample
Mouthful (616), wherein the first pond internal reflector (611) and the second pond internal reflector (612) are cyclic annular concave spherical mirror, and
It is equipped with light well (6112) and light hole (6122) respectively thereon；
The ultraviolet photolysis component is the 5th reflecting mirror (14) being successively equipped on ultraviolet laser (12) and its UV light path, expands
Shu Jing (15), the second calcirm-fluoride window (614), the second pond internal reflector (612), the first pond internal reflector (611) and the first fluorine
Change calcium window (613), generates excited oxygen atom for photodissociation ozone to generate hydroxy radical；
The smooth switching part is to be placed on the infrared light path between Distributed Feedback Laser (1) and light well (6112), reference cell (4)
Semi-transparent semi-reflecting lens (3), and the second reflecting mirror being placed on the infrared light path between light hole (6122) and infrared detector (11)
(7) and condenser lens (10)；
The polarised light converting member is the polarizer (5) being placed between Distributed Feedback Laser (1) and semi-transparent semi-reflecting lens (3), is placed in reference
The first analyzer (16) between pond (4) and reference detector (17), and be placed between the second reflecting mirror (7) and condenser lens (10)
The second analyzer (9)；
The phase detecting section is electrically connected the first lock-in amplifier (18) and infrared detector (11), output by input terminal
The second lock-in amplifier (22) and output end of end electrical connection computer (24) are electrically connected ultraviolet laser (12) and meter
The digital delay generator (23) of calculation machine (24) forms, for by the signal of infrared detector (11) and reference detector (17)
Computer (24) are sent into after the demodulation of signal same-phase, and the pulse daley of control ultraviolet laser (12), and simultaneously will triggering
Signal is sent to computer (24), and the zero point to guarantee time of measuring is unified and record hydroxy radical activity declines and swings the baseline of signal；
The exploring block is the infrared detector (11) for being placed in condenser lens (10) focal point, and is placed in the first analyzer
(16) reference detector in optical path (17).
2. hydroxy radical reactivity measuring device according to claim 1, it is characterized in that cyclic annular concave spherical mirror
Surface is coated with golden film or silverskin or deielectric-coating.
3. hydroxy radical reactivity measuring device according to claim 1, it is characterized in that two cyclic annular concave spherical surface reflections
The diameter of mirror is 50mm, center first in annular distance (6111) and second diameter of annular distance (6121) be 30mm.
4. hydroxy radical reactivity measuring device according to claim 1, it is characterized in that light well (6112) and out light
The bore dia in hole (6122) is 5mm, is respectively positioned on the inner ring side of cyclic annular concave spherical mirror.
5. hydroxy radical reactivity measuring device according to claim 1, it is characterized in that ultraviolet laser (12) is defeated
The Nd:YAG pulse laser of wavelength 266nm out, flash frequency≤5/tHz, t therein are the time swap of gaseous sample.
6. hydroxy radical reactivity measuring device according to claim 1, it is characterized in that after beam expanding lens (15) expands
Ultraviolet hot spot diameter≤ring-type concave spherical mirror inner ring bore dia.
7. hydroxy radical reactivity measuring device according to claim 1, it is characterized in that Distributed Feedback Laser (1) be polarized
The first reflecting mirror (2) are equipped between device (5).
8. hydroxy radical reactivity measuring device according to claim 1, it is characterized in that the second reflecting mirror (7) and second
Third reflecting mirror (8) are equipped between analyzer (9).
9. hydroxy radical reactivity measuring device according to claim 1, it is characterized in that ultraviolet laser (12) and the
The 4th reflecting mirror (13) is equipped between five reflecting mirrors (14).
10. hydroxy radical reactivity measuring device according to claim 9, it is characterized in that the 4th reflecting mirror (13) and
The surface of five reflecting mirrors (14) is coated with that 532nm is anti-reflection and the anti-two point deielectric-coating of 266nm high.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910000596.8A CN109856065B (en) | 2019-01-02 | 2019-01-02 | Hydroxyl radical reaction activity measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910000596.8A CN109856065B (en) | 2019-01-02 | 2019-01-02 | Hydroxyl radical reaction activity measuring device |
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| CN109856065A true CN109856065A (en) | 2019-06-07 |
| CN109856065B CN109856065B (en) | 2021-10-12 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169218A (en) * | 2017-12-15 | 2018-06-15 | 中国科学院合肥物质科学研究院 | A kind of hydroxy radical in-situ measurement system |
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2019
- 2019-01-02 CN CN201910000596.8A patent/CN109856065B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169218A (en) * | 2017-12-15 | 2018-06-15 | 中国科学院合肥物质科学研究院 | A kind of hydroxy radical in-situ measurement system |
Non-Patent Citations (2)
| Title |
|---|
| WEIXIONG ZHAO 等: "Sensitive and selective detection of OH radicals using Faraday rotation spectroscopy at 2.8 μm", 《OPTICS EXPRESS》 * |
| 楼晟荣: "大气环境中OH自由基反应活性的检测技术", 《中国博士学位论文全文数据库 工程科技Ⅰ辑》 * |
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