CN206505011U - Air NO3Number of free radical on-line measurement system - Google Patents
Air NO3Number of free radical on-line measurement system Download PDFInfo
- Publication number
- CN206505011U CN206505011U CN201621493039.2U CN201621493039U CN206505011U CN 206505011 U CN206505011 U CN 206505011U CN 201621493039 U CN201621493039 U CN 201621493039U CN 206505011 U CN206505011 U CN 206505011U
- Authority
- CN
- China
- Prior art keywords
- light
- air
- convex lens
- light source
- free radical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model, which is disclosed, strengthens by force the air NO of absorption spectroscopy techniques based on broadband3Number of free radical on-line measurement system, at least including light source controller, light source, the first convex lens, the second convex lens, a pair of high reflectance eyeglasses, test chamber, optical fiber, spectrometer, zero point generators.The utility model constitutes resonator using a pair of high reflectance eyeglasses, and LED makees light source, and spectrometer makees detector.Other absorbent components are removed to NO using dynamic zero point3The influence of free radical measurement, is realized to air NO3The online accurate measurement of free radical.The characteristics of the utility model scheme has low test limit, high sensitivity, high-spatial and temporal resolution, high stability and low cost.
Description
Technical field
The utility model belongs to air quality field of measuring technique, is related to NO in air3Free radical on-line measurement, is especially related to
And a kind of air NO based on wideband cavity reinforced absorption spectrum technology3Number of free radical on-line measurement system.
Background technology
NO in air3Free radical is very important oxidant in night air, and its activity is high, and atmospheric lifetime is short and concentration
Level is low so that its online accurate measurement is very difficult.Existing air NO3Free radical line Measurement Technique has Difference Absorption light
Spectral technology (DOAS), laser Induced Fluorescence Technology (LIF) and Research on Cavity Ring Down Spectroscopy (CRDs), wherein, the measurement of DOAS technologies
Be test substance on its light path (＞ 2km) mean concentration, it is impossible to obtain the concentration information of small spatial scale, at the same easily by
Ambient influnence；The calibration of LIF technical sophistications could realize accurate measurement, and its sensitivity is low, complex operation and maintenance cost height；
CRDs technologies obtain the concentration level of test substance by measuring the change of the ring-down time of light intensity in resonator, and the technology is adopted
Light source is made of laser of narrowband and higher is required to the stability of a system.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model, which provides a kind of broadband that is based on, strengthens by force absorption spectrum skill
The air NO of art3Concentration on-line measurement system, with low test limit, high sensitivity, high-spatial and temporal resolution, high stability and low
The characteristics of cost.
Principle of the present utility model is：The utility model proposes strengthen absorption spectroscopy techniques by force based on broadband to carry out air
NO3The on-line measurement of concentration, cavity reinforced absorption spectrum technology is that a kind of high sensitivity based on optical resonator is high-resolution
Line Measurement Technique, can use cheap, and the compact LED of size does the light source transmitting continuous light in broadband, and light enters by height
Sub-fraction light is had after the optical resonator of reflectance ratio eyeglass composition through high reflectance eyeglass, as light is multiple in intracavitary
Reflection, the transmitted light intensity of measurement is the light intensity integration in the range of certain time.Spectrum of the measurement without under test gas component is referred to as
Reference spectra I0(λ), the spectrum containing component to be measured be referred to as sampling spectrum I (λ), it is known that the reflectivity R (λ) of high reflectance eyeglass with
And effectively cavity length d, absorption coefficient (λ) can be obtained by calculating.Absorption coefficient includes the under test gas in gas-detecting cavity
Absorption (the Particle density n of gasiWith absorption cross-section σiProduct plus and), the Rayleigh scattering α of mediumrayAnd Mie scattering αmieThree
Part, wherein, the multi-order function fitting of Rayleigh scattering and Mie scattering wavelength available is therefore, to be measured by least square fitting
The absorption cross-section of gas is the concentration that can obtain under test gas to absorption coefficient.Due to needing the absorption cross-section to test substance to enter
Row fitting, therefore this method is a kind of absolute measurement means.Due to NO3Free radical has characteristic absorption, and NO near 662nm3
Absorption cross-section, it is known that therefore can with transit chamber enhancing absorption spectroscopy techniques carry out NO in accurate quantitative analysis air3The concentration of free radical.
The narrow-band absorption of steam is stronger near 662nm wave bands, and the water vapor absorption section obtained by spectrometer convolution of functions can be with
The change of environmental condition and change so that the absorption coefficient of steam be difficult to it is quantitative so as to NO3Measurement formed interference.Meanwhile,
The NO added using zero point generator in sample gas in the NO gases removal sample of high concentration3, generate relative sample light
Spectrum only only has NO3The reference spectra of change in concentration to zero, so as to avoid the interference of steam non-linear absorption, realizes NO3It is accurate
It is quantitative.
The utility model provide technical scheme be：
A kind of air NO3Number of free radical on-line measurement system, the system constitutes light using a pair of high reflectance eyeglasses
Resonator is learned, strengthens absorption spectroscopy techniques by force based on broadband and realizes to air NO3The on-line measurement of concentration, including light source control
Device, light source, the first convex lens, the second convex lens, a pair of high reflectance eyeglasses, sample detection chamber, optical fiber, spectrometer, zero point hairs
Raw device；The light source controller connects and controls light source；The placement that vertically opposes of a pair of high reflectance eyeglass central coaxials forms light
Resonator is learned, the two ends of optical resonator are respectively provided with light inlet and light-emitting window；Is placed between light source and optical resonator
One convex lens, the first convex lens rear end is the light inlet of optical resonator, places the second convex lens after other end light-emitting window；Second
Optical fiber, optical fiber other end access spectrometer are installed after convex lens；Sample detection chamber, sample detection chamber are placed in the middle of optical resonator
There are injection port and gas outlet, injection port front end connection zero point generator；Continuous wide band is launched by light-source controller controls light source
Visible ray, it is seen that light enters optical resonator by forming directional light, directional light after the first convex lens by light inlet, and in light
Roundtrip between resonator is learned, all there can be sub-fraction light to be transmitted away from light-emitting window during per secondary reflection, transmitted light passes through the
Two convex lens converge and pass through optical fiber and be passed through is detected and is gathered preservation to spectrometer to light intensity signal.
For above-mentioned air NO3Concentration on-line measurement system, it is characterised in that：Light source, the first convex lens, the second convex lens
Mirror, a pair of high reflectance eyeglasses, one end of sample detection chamber and optical fiber are each attached in aluminum frame.First convex lens and one side are high
Reflectance ratio eyeglass is arranged on the first stainless steel chamber frame, and another side high reflectance eyeglass and the second convex lens are stainless installed in second
On steel chamber frame, two chamber framves are each attached in aluminum frame, the first convex lens, the second convex lens and a pair of high reflections in two chamber framves
Rate lens position keeps central coaxial and position is unadjustable.Light source adjustment frame is installed in first stainless steel chamber frame front end, and second is not
Become rusty steel chamber frame rear end installation fiber adjusting mount, passes through optical fiber and connects fiber adjusting mount and spectrometer；It is achieved in light source position
It is adjusted, is three-dimensional adjustable；By adjusting light source position so that light enters optical resonance intracavitary simultaneously perpendicular through light inlet
It is coaxial with optical resonator, it is internally formed multiple reflections in optical resonator.
By the position for adjusting fiber adjusting mount (to be three-dimensional adjustable) so that measurement signal is maximized, and transmitted light passes through light
Fibre access spectrometer is detected；The optical fiber used for 600um core diameters optical fiber.
For above-mentioned air NO3Concentration on-line measurement system, it is characterised in that：Pass through respectively between two stainless steel chamber framves
Corrugated stainless steel tubing is connected with sample detection chamber, and tie point is that O circles compress sealing, and this is designed primarily for buffering temperature change
Deformation to chamber frame and sample detection chamber.Sample detection chamber and bellows are hollow so that sample introduction gas passes through light path
Produce absorption.Sample detection chamber and corrugated stainless steel tubing, which are used, is lined with reduction NO in PFA materials3Wall effect is lost, sample
The internal diameter of test chamber is 10mm, and the stop of the sample gas under the premise of the identical speed of evacuation is reduced while ensure that light intensity
Time, further reduce NO3Wall effect is lost.
For above-mentioned air NO3Concentration on-line measurement system, it is characterised in that：Air inlet (injection port) is arranged at test chamber top
With gas outlet (outlet), the two ends of test chamber pass through the first corrugated stainless steel tubing and the second corrugated stainless steel tubing and first respectively
Chamber frame and the connection of the second chamber frame.Sample detection chamber and bellows are hollow so that sample introduction gas produces absorption by light path.Sample
Test chamber and corrugated stainless steel tubing, which are used, is lined with reduction NO in PFA materials3Wall effect is lost, and the internal diameter of sample detection chamber is
10.0mm；
For above-mentioned air NO3Concentration on-line measurement system, it is characterised in that：A pair of high reflectance eyeglasses in the system
Reflectivity be all higher than 99.99%, and spectrum when periodically measurement sample detection intracavitary is full of pure nitrogen gas and helium respectively comes accurate
Really demarcate the size of reflectivity.
For above-mentioned air NO3Concentration on-line measurement system, it is characterised in that：The light source that the system is used is high power
LED monochromatic light sources, the light spectral centre wavelength of transmitting is 660nm, and energy of light source is concentrated mainly on 650-670nm.
For above-mentioned air NO3Concentration on-line measurement system, it is characterised in that：Injection port front end by one 1/4 four
Fluorine threeway connects zero point generator；Zero point generator can self-timing opening or closing.
Above-mentioned air NO3Operationally, system constitutes optics to concentration on-line measurement system using a pair of high reflectance eyeglasses
Resonator, absorption spectroscopy techniques are strengthened by force based on broadband, and air NO is realized by following process3The on-line measurement of concentration：
1) light source controller is connected into light source；Keep center same on first high reflectance eyeglass and the second high reflectance eyeglass
Axle vertically opposes placement, forms optical resonator, the two ends of optical resonator set light inlet and light-emitting window respectively；Light source and
The first convex lens are placed between one high reflectance eyeglass, the second convex lens, the second convex lens are placed in the second high reflectance eyeglass rear end
Mirror rear end is installed by optical fiber, optical fiber other end access spectrometer；
2) continuous wide band visible ray is launched by light-source controller controls light source；
The position of light source is three-dimensional adjustable, and transmitting light is ensured vertically into optical resonator by adjusting light source position,
And it is coaxial with optical resonator so that light enters repeatedly bounce-back internally after resonator.Pass through light-source controller controls light source
Temperature stabilization (temperature stabilization is 17.5 DEG C ± 0.1 DEG C in the utility model embodiment) within ± 0.1 degree Celsius, and launch list
The feux rouges (centre wavelength 660nm) of wavelength；
3) visible ray enters optical resonator by forming directional light, directional light after the first convex lens by light inlet, and
The roundtrip between optical resonator, sub-fraction light is transmitted away from light-emitting window, and transmitted light is converged by the second convex lens
And be passed through by optical fiber to spectrometer；
Optical fiber realizes the three-dimensional adjustable of position by fiber adjusting mount, causes measurement by adjusting the position of optical fiber receiving terminal
Signal maximize, the optical fiber used for 600um core diameters optical fiber.
4) sample detection chamber is placed in the middle of optical resonator, sample detection chamber is provided with air inlet and gas outlet, injection port
Front end connects zero point generator；Sample introduction gas produces absorption by light path；
The utility model is in specific implementation, and the reflectivity of the first high reflectance eyeglass and the second high reflectance eyeglass is big
In 99.99%, and it is anti-come accurate calibration by spectrum when periodically measurement sample detection intracavitary is full of pure nitrogen gas and helium respectively
Penetrate the size of rate；
5) zero point generator can self-timing opening or closing；It is zero point pattern, from zero when zero point generator is opened
NO in the NO gases of point generator sustained release low discharge high concentration, NO and sample gas3Reaction, so as to reach sample inspection
By the NO in sample before survey chamber3Remove, while the concentration of other absorbing materials (such as steam) in sample is constant, now measure
Spectrum be reference spectra；It is normal sampling configuration, the spectrum of measurement is sampling spectrum when closing zero point generator；It is logical
Cross sequencing zero point generator and realize time switch circulation work, so as to realize the acquisition of dynamic zero point；
In the utility model embodiment, air inflow is 5.0L/min in sampling process, and sample time resolution is set to
5s；Zero point generator circulation time is set to 5min, wherein preceding 20s is zero point pattern, NO concentration is 100ppm, and flow is
10mL/min (i.e. zero point generator works, and gathers reference spectra)；4min40s is sampling configuration (i.e. zero point generator not work afterwards
Make, collection sampling spectrum)；
6) spectrometer is detected to light intensity signal and gathers preservation spectral intensity signal data, then is obtained by data processing
To NO3The concentration of free radical, is achieved in air NO3The on-line measurement of concentration.
In measurement, the NO in zero point generator, sample is opened3The NO gases fast reaction discharged with zero point generator is simultaneously
Remove, while not disturbing other gas components also, measurement has obtained not containing NO3The reference spectra of free radical；Close zero point
Sample detection intracavitary is sample air during generator, and measurement obtains NO containing air3The sampling spectrum that free radical absorbs；Zero point occurs
Device function is that the NO and sample gas of timing automatic opening low discharge high concentration are mixed and removed the NO in air3Free radical is to obtain
Reference spectra is taken, zero point generator circulation work is set by sequencing, each circulation includes once timing and opened and timing
Close, sampling spectrum and reference spectra are automatically switched and be continuously available so as to realize.On the basis of high time resolution, reference
Spectrum and sampling spectrum in other absorbent components it is constant be basically unchanged, both difference is only derived from NO in air3Free radical
Absorption；Spectrometer is detected to light intensity signal, gathers and preserve spectral intensity signal data.
Follow-up data processing obtains NO3The concentration of free radical, can use least square fitting NO3The concentration of free radical, makes
Wave band is 640-680nm.When follow-up data is handled, specifically, reference spectra and sampling spectrum in each circulation
Data processing is carried out for a unit pairing, in the reflectivity R (λ) of known high reflectance eyeglass and effective cavity length d, is led to
Cross the calculating of formula 1 and obtain absorption coefficient (λ)：
In formula 1, I0(λ) is the reference spectra of spectrometer collection；I (λ) is sampling spectrum；
It is that 640-680nm (can pass through other Rayleigh scatterings, Mie scattering in wavelength again by least square fitting method
Three rank multinomials are fitted) and NO3Absorption cross-section pass through NO3Particle density be fitted to absorption coefficient, so as to obtain in air
NO3The concentration of free radical.
Compared with prior art, the beneficial effects of the utility model are：
The utility model offer is a kind of to strengthen by force the air NO of absorption spectroscopy techniques based on broadband3Number of free radical is surveyed online
Amount system, at least including light source controller, light source, the first convex lens, the second convex lens, a pair of high reflectance eyeglasses, test chamber,
Optical fiber, spectrometer, zero point generator.The utility model constitutes resonator using a pair of high reflectance eyeglasses, and LED makees light source, light
Spectrometer makees detector.Other absorbent components are removed to NO using dynamic zero point3The influence of free radical measurement, is realized to air NO3From
By the online accurate measurement of base.The utility model scheme has low test limit, high sensitivity, high-spatial and temporal resolution, high stability
And the characteristics of low cost.
Advantage of the present utility model includes following several respects：
(1) the high reflectance eyeglass reflectivity that the utility model is used is more than 99.99%, on the one hand realizes optics coupling
The multiple reflections of intracavitary light are closed, while ensure that the light intensity signal of transmitted light is stronger, the high reflectivity mirror in chamber frame
Piece automatic coupling, it is unadjustable, improve the stability of optical resonator.
(2) the utility model is connected with chamber frame respectively using two bellowss at the two ends of sample detection chamber, effectively buffering
Temperature change causes the length change of sample detection chamber and causes the change in location between chamber frame, improves the thermally-stabilised of instrument
Property.
(3) the utility model produces dynamic zero point using zero point generator and obtains reference spectra, sampling spectrum and reference
The non-linear absorption of the steam of same concentration is contained in the signal of spectrum, both differences are only by NO3The absorption of free radical is drawn
Rise, the interference of steam non-linear absorption is avoided in calculating process.
(4) the utility model is using the LED of single-point as light source, and with cheap, size is compact, and stability is high
The characteristics of long lifespan；Signal detection is capable of being carried out in real time to spectral intensity signal for high time resolution using portable spectrometer
Collection and storage.
(5) the utility model is single-point Sampling techniques, and spatial resolution is high, and temporal resolution is high, sensitivity is high, measurement
Interference dynamic deduction, stability height, low cost, operation and maintenance are simple.
Brief description of the drawings
The air NO that Fig. 1 provides for the utility model3The structure chart of number of free radical on-line measurement system；
Wherein, 1-light source controller；2-light source；3-the first convex lens；4-the first high reflectance eyeglass；5-the first
Corrugated stainless steel tubing；6-sample detection chamber；7-the second corrugated stainless steel tubing；8-the second high reflectance eyeglass；9-the second is convex
Lens；10-fiber adjusting mount；11-optical fiber；12-spectrometer；13-air inlet；14-gas outlet；15-zero point generator；
16-the first chamber frame；17-the second chamber frame.
Fig. 2 is the air NO that the utility model is provided3Number of free radical on-line measurement system workflow block diagram.
Embodiment
Below in conjunction with the accompanying drawings, the utility model is further described by embodiment, but does not limit this practicality in any way
New scope.
The utility model offer is a kind of to strengthen by force the air NO of absorption spectroscopy techniques based on broadband3Number of free radical is surveyed online
Amount system, at least including light source controller, light source, the first convex lens, the second convex lens, a pair of high reflectance eyeglasses, test chamber,
Optical fiber, spectrometer, zero point generator.The utility model constitutes resonator using a pair of high reflectance eyeglasses, and LED makees light source, light
Spectrometer makees detector.Other absorbent components are removed to NO using dynamic zero point3The influence of free radical measurement, is realized to air NO3From
By the online accurate measurement of base.
As shown in Figure 1.Strengthen the air NO of absorption spectroscopy techniques by force based on broadband3Number of free radical on-line measurement system,
Including light source controller 1, light source 2, the first convex lens 3, the first high reflectance eyeglass 4, the first corrugated stainless steel tubing 5, sample inspection
Survey chamber 6, the second corrugated stainless steel tubing 7, the second high reflectance eyeglass 8, the second convex lens 9, fiber adjusting mount 10, optical fiber 11, light
Spectrometer 12, air inlet 13, gas outlet 14, zero point generator 15, the first chamber frame 16, the second chamber frame 17.
Light source controller 1 connects and controls light source 2, and a pair of high reflectance eyeglasses 4 and 8 keep central coaxial vertical to standing up
Put to form optical resonator, the first convex lens 3 are placed between light source 2 and high reflectance eyeglass 4, the rear end of high reflectance eyeglass 8 is put
The second convex lens 9 are put, fiber adjusting mount 10 is placed in the rear end of the second convex lens 9, and fiber adjusting mount 10 and light are connected by optical fiber 11
Spectrometer 12.Wherein the first convex lens 3 and high reflectance eyeglass 4 are fixed on the first chamber frame 16, and high reflectance eyeglass 8 and second is convex
Lens 9 are fixed on the second chamber frame 17, and all lens positions in chamber frame are unadjustable and coaxial.
The position of light source 2 is three-dimensional adjustable, and transmitting light is ensured vertically into optical resonator by adjusting light source position,
And it is coaxial with optical resonator so that light enters repeatedly bounce-back internally after resonator.
Optical fiber 11 realizes the three-dimensional adjustable of position by fiber adjusting mount 10, is caused by the position for adjusting optical fiber receiving terminal
Measurement signal maximize, the optical fiber used for 600um core diameters optical fiber.
Control the temperature stabilization of light source 2 within ± 0.1 degree Celsius by light source controller 1 and launch the feux rouges of Single wavelength
(centre wavelength 660nm), it is seen that light passes through the first high reflectance eyeglass 4 by forming directional light, directional light after the first convex lens 3
Enter optical resonator afterwards, the subsequent roundtrip between optical resonator can all have sub-fraction light from the during per secondary reflection
Two high reflectance eyeglasses 8 are transmitted away, and transmitted light is converged by the second convex lens 9 and is passed through by optical fiber 11 to 12 pairs of spectrometer
Light intensity signal is detected and gathers preservation.
Sample detection chamber 6 is placed in the middle of optical resonator, air inlet 13 and gas outlet 14 are arranged at test chamber top, test chamber
Two ends are connected by the first corrugated stainless steel tubing 5 and the second corrugated stainless steel tubing 7 with the first chamber frame 16 and the second chamber frame 17 respectively.
Sample detection chamber and bellows are hollow so that sample introduction gas produces absorption by light path.Sample detection chamber and stainless steel wave
Line Guan Jun, which is used, is lined with reduction NO in PFA materials3Wall effect is lost, and the internal diameter of sample detection chamber is 10.0mm.
The leading portion of injection port 13 connects zero point generator 15 by the tetrafluoro threeway of one 1/4, and zero point generator can be automatic
Timing is opened or closed, during opening, from the NO gases of zero point generator sustained release low discharge high concentration, NO and sample gas
In NO3Reaction is so that by the NO in sample before test chamber is reached3Remove, while other absorbing material (such as water in sample
Vapour) concentration it is constant, the spectrum now measured be reference spectra；When closing zero point generator, the utility model is normal
Sampling configuration, the spectrum of measurement is sampling spectrum.Sequencing zero point generator realizes its time switch circulation work, so as to realize
The acquisition of dynamic zero point.
Illustrate the workflow and data acquisition of the utility model below by a specific example.
Open after light source 2 and light source controller 1, light can repeatedly be rebounded finally by spectrum by optical resonator and realization
Instrument carries out spectral detection.The temperature of the control light source of light source controller 1 makes it maintain 17.5 DEG C ± 0.1 DEG C, after light stability, enters
The light intensity and spatial distribution for penetrating the transmitted light of light sum also keep stable.Air inflow is 5.0L/min, sampling time in sampling process
Resolution ratio is set to 5s.Zero point generator circulation time is set to 5min, wherein preceding 20s is zero point pattern, NO concentration is
100ppm, flow is 10mL/min (i.e. zero point generator works, and gathers reference spectra), and rear 4min40s is sampling configuration (i.e. zero
Point generator does not work, collection sampling spectrum), wherein the delustring in sampling spectrum I (λ) mainly includes NO3Absorption and other
Absorption and scattering (such as steam, NO2And aerosol), and reference spectra I0The delustring of (λ) then only absorb comprising other and
Scatter (such as steam, NO2And aerosol), when follow-up data is handled, reference spectra and sampling spectrum in each circulation
Data processing is carried out for a unit pairing, in the reflectivity R (λ) of known high reflectance eyeglass and effective cavity length d, is led to
Cross the calculating of formula 1 and obtain absorption coefficient (λ)：
It is that 640-680nm (can pass through other Rayleigh scatterings, Mie scattering in wavelength again by least square fitting method
Three rank multinomials are fitted) and NO3Absorption cross-section pass through NO3Particle density be fitted to absorption coefficient, so as to obtain in air
NO3The concentration of free radical.
It should be noted that the purpose for publicizing and implementing example is that help further understands the utility model, but this area
Technical staff be appreciated that：Do not departing from the utility model and spirit and scope of the appended claims, it is various replacement and
Modification is all possible.Therefore, the utility model should not be limited to embodiment disclosure of that, and the utility model is claimed
Scope be defined by the scope that claims are defined.
Claims (10)
1. a kind of air NO3Number of free radical on-line measurement system, it is humorous that the system constitutes optics using a pair of high reflectance eyeglasses
Shake chamber, including light source controller, light source, the first convex lens, the second convex lens, a pair of high reflectance eyeglasses, sample detection chamber, light
Fine, spectrometer and zero point generator；The light source controller connects and controls light source；The pair of high reflectance eyeglass center is same
Axle vertically opposes placement so as to form optical resonator, and the two ends of optical resonator set light inlet and light-emitting window respectively；Light source
The first convex lens are placed between optical resonator, the first convex lens rear end is the light inlet of optical resonator, in optical resonance
The second convex lens are placed after the light-emitting window of chamber；Optical fiber, the other end access spectrometer of optical fiber are installed after the second convex lens；In light
Learn and sample detection chamber is placed in the middle of resonator, sample detection chamber is provided with air inlet and gas outlet, air inlet front end connection zero point hair
Raw device；Continuous wide band visible ray is launched by light-source controller controls light source, it is seen that light after the first convex lens by forming parallel
Light, directional light enters optical resonator, and the roundtrip between optical resonator by light inlet, and sub-fraction light is from light extraction
Mouth is transmitted away, and transmitted light is converged by the second convex lens and passes through optical fiber and is passed through to spectrometer, and spectrometer enters to light intensity signal
Row detects and gathers preservation, is achieved in air NO3The on-line measurement of concentration.
2. air NO as claimed in claim 13Number of free radical on-line measurement system, it is characterised in that：The optical fiber is 600um
The optical fiber of core diameter.
3. air NO as claimed in claim 13Number of free radical on-line measurement system, it is characterised in that：It is the light source, first convex
Lens, the second convex lens, a pair of high reflectance eyeglasses, one end of sample detection chamber and optical fiber are each attached in aluminum frame；Described
One convex lens and a face high reflectance eyeglass are arranged on the first stainless steel chamber frame, another side high reflectance eyeglass and the second convex lens
Mirror is arranged on the second stainless steel chamber frame, and two chamber framves are each attached in aluminum frame；It is the first convex lens in two chamber framves, second convex
Lens and a pair of high reflectance eyeglass positions keep central coaxials and position is unadjustable；First stainless steel chamber frame front end is installed by light
Fiber adjusting mount is installed in source adjustment frame, the second stainless steel chamber frame rear end, and fiber adjusting mount and spectrometer are connected by optical fiber；Thus
Realize that light source position is adjustable for three-dimensional；By adjusting light source position so that light enters optical resonance intracavitary perpendicular through light inlet
And it is coaxial with optical resonator, it is internally formed multiple reflections in optical resonator.
4. air NO as claimed in claim 33Number of free radical on-line measurement system, it is characterised in that：The first stainless steel chamber
It is connected respectively by corrugated stainless steel tubing with the sample detection chamber between frame and the second stainless steel chamber frame, tie point encloses for O
Compress sealing；Sample detection chamber and corrugated stainless steel tubing are hollow；Sample detection chamber and corrugated stainless steel tubing use PFA materials
Expect liner；The internal diameter of sample detection chamber is 10mm.
5. air NO as claimed in claim 13Number of free radical on-line measurement system, it is characterised in that：The pair of high reflectance
The reflectivity of eyeglass is all higher than 99.99%, and spectrum when periodically measurement sample detection intracavitary is full of pure nitrogen gas and helium respectively
Carry out the size of accurate calibration reflectivity.
6. air NO as claimed in claim 13Number of free radical on-line measurement system, it is characterised in that：The light source is high power
LED monochromatic light sources, the light spectral centre wavelength of transmitting is 660nm.
7. air NO as claimed in claim 13Number of free radical on-line measurement system, it is characterised in that：The sample detection chamber
Air inlet front end connects zero point generator by the tetrafluoro threeway of one 1/4；Zero point generator can self-timing be opened for zero point
Pattern is closed as sampling configuration；The air inflow of the sample detection chamber is 5.0L/min, and sample time resolution is set to 5s,
Zero point generator circulation time is set to 5min, wherein preceding 20s is zero point pattern, NO concentration is 100ppm, and flow is 10mL/
min；4min40s is sampling configuration afterwards.
8. air NO as claimed in claim 13Number of free radical on-line measurement system, it is characterised in that：The light source controller control
The temperature stabilization of light source processed launches the feux rouges of Single wavelength within ± 0.1 degree Celsius.
9. air NO as claimed in claim 13Number of free radical on-line measurement system, it is characterised in that：The optical fiber is 600um
The optical fiber of core diameter, the optical fiber realizes that position is adjustable for three-dimensional by fiber adjusting mount.
10. air NO as claimed in claim 13Number of free radical on-line measurement system, it is characterised in that：The pair of high reflection
The reflectivity of rate eyeglass is all higher than 99.99%, and by when periodically measurement sample detection intracavitary is full of pure nitrogen gas and helium respectively
Spectrum carry out the size of accurate calibration reflectivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621493039.2U CN206505011U (en) | 2016-12-30 | 2016-12-30 | Air NO3Number of free radical on-line measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621493039.2U CN206505011U (en) | 2016-12-30 | 2016-12-30 | Air NO3Number of free radical on-line measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206505011U true CN206505011U (en) | 2017-09-19 |
Family
ID=59839664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621493039.2U Active CN206505011U (en) | 2016-12-30 | 2016-12-30 | Air NO3Number of free radical on-line measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206505011U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596437A (en) * | 2016-12-30 | 2017-04-26 | 北京大学 | On-line measuring system and on-line measuring method for concentration of NO3 free radicals in atmosphere |
| CN109060691A (en) * | 2018-09-04 | 2018-12-21 | 深圳市卡普瑞环境科技有限公司 | A kind of calculation method and equipment of atmospheric molecule concentration |
| US20230184662A1 (en) * | 2021-12-15 | 2023-06-15 | Samsung Electronics Co., Ltd. | Optical measurement apparatus and optical measurement method |
-
2016
- 2016-12-30 CN CN201621493039.2U patent/CN206505011U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596437A (en) * | 2016-12-30 | 2017-04-26 | 北京大学 | On-line measuring system and on-line measuring method for concentration of NO3 free radicals in atmosphere |
| CN106596437B (en) * | 2016-12-30 | 2023-06-20 | 北京大学 | Atmospheric NO 3 Free radical concentration on-line measuring system and method |
| CN109060691A (en) * | 2018-09-04 | 2018-12-21 | 深圳市卡普瑞环境科技有限公司 | A kind of calculation method and equipment of atmospheric molecule concentration |
| US20230184662A1 (en) * | 2021-12-15 | 2023-06-15 | Samsung Electronics Co., Ltd. | Optical measurement apparatus and optical measurement method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106596437A (en) | On-line measuring system and on-line measuring method for concentration of NO3 free radicals in atmosphere | |
| JP6134063B2 (en) | Multi-channel aerosol scattering absorption measuring instrument | |
| CN105424631B (en) | A kind of hypersensitivity nitrogen oxides measuring system based on UV, visible light wave band absorption spectrum | |
| Li et al. | Monitoring optical properties of aerosols with cavity ring‐down spectroscopy | |
| Abo Riziq et al. | Optical properties of absorbing and non-absorbing aerosols retrieved by cavity ring down (CRD) spectroscopy | |
| Fiebig et al. | Optical closure for an aerosol column: Method, accuracy, and inferable properties applied to a biomass‐burning aerosol and its radiative forcing | |
| CN206505011U (en) | Air NO3Number of free radical on-line measurement system | |
| CN102735643B (en) | Device and method for measuring water vapor content by using self-calibrating optical cavity ring-down spectroscopy | |
| Bluvshtein et al. | A new approach for retrieving the UV–vis optical properties of ambient aerosols | |
| CN209327165U (en) | A kind of low concentration emission measurement device | |
| Wagner et al. | A review of optical measurements at the aerosol and cloud chamber AIDA | |
| WO2022267963A1 (en) | Comprehensive detection apparatus for composite gas | |
| Wang et al. | Extinction efficiencies of mixed aerosols measured by aerosol cavity ring down spectrometry | |
| CN108680527B (en) | Method for measuring radioactive carbon14Optical cavity ring-down spectrometer of C | |
| CN106124407A (en) | A kind of optical cavity, the aerosol extinction instrument with this optical cavity and the measuring method of Aerosol Extinction | |
| Juntong et al. | The research of long-optical-path visible laser polarization characteristics in smoke environment | |
| CN203858183U (en) | Multi-channel aerosol scattering absorption measuring instrument | |
| CN103424369A (en) | Pollution-gas differential optical absorption spectroscopy measurement system with optical fiber structure | |
| Foot | Spectrophone measurements of the absorption of solar radiation by aerosol | |
| Saseendran et al. | Dual-cavity spectrometer for monitoring broadband light extinction by atmospheric aerosols | |
| Wang et al. | Laser absorption spectroscopy applied to monitoring of short-lived climate pollutants (SLCPs) | |
| CN207528617U (en) | A kind of Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy | |
| Wang et al. | Detection of CO based on optical feedback cavity enhanced absorption spectroscopy | |
| CN109342344B (en) | Calibration-free device of mercury analyzer and determination method thereof | |
| Nakayama et al. | Measurements of aerosol optical properties using spectroscopic techniques |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |