CN104880434B - The detection device and method of weakly-absorbing gas in complex environment - Google Patents
The detection device and method of weakly-absorbing gas in complex environment Download PDFInfo
- Publication number
- CN104880434B CN104880434B CN201510275612.6A CN201510275612A CN104880434B CN 104880434 B CN104880434 B CN 104880434B CN 201510275612 A CN201510275612 A CN 201510275612A CN 104880434 B CN104880434 B CN 104880434B
- Authority
- CN
- China
- Prior art keywords
- gas
- absorption
- weakly
- detector
- strong jamming
- 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
- 238000001514 detection method Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010521 absorption reaction Methods 0.000 claims abstract description 68
- 238000005259 measurement Methods 0.000 claims abstract description 43
- 238000004458 analytical method Methods 0.000 claims abstract description 37
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims abstract description 16
- 238000004847 absorption spectroscopy Methods 0.000 claims abstract description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 153
- 239000007789 gas Substances 0.000 claims description 102
- 239000013307 optical fiber Substances 0.000 claims description 48
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 28
- 239000001301 oxygen Substances 0.000 claims description 28
- 229910052760 oxygen Inorganic materials 0.000 claims description 28
- 238000001228 spectrum Methods 0.000 claims description 16
- 230000003595 spectral effect Effects 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000001285 laser absorption spectroscopy Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- 238000001658 differential optical absorption spectrophotometry Methods 0.000 description 12
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 6
- 229910052724 xenon Inorganic materials 0.000 description 6
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 6
- 230000007812 deficiency Effects 0.000 description 4
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 3
- 229910052805 deuterium Inorganic materials 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 150000001555 benzenes Chemical class 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 208000031320 Teratogenesis Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000006117 anti-reflective coating Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002608 ionic liquid Substances 0.000 description 1
- 238000000752 ionisation method Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002703 mutagenesis Methods 0.000 description 1
- 231100000350 mutagenesis Toxicity 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention provides a kind of detection device of weakly-absorbing gas in complex environment, the detection device includes: the absorption line of the wavelength covering weakly-absorbing gas for the first measurement light that first light source issues；The absorption line of strong jamming gas in the wavelength covering complex environment for the second measurement light that second light source issues；In the absorption region of the weakly-absorbing gas of the first measurement light, the absorption of strong jamming gas is greater than 10 times of the absorption of weakly-absorbing gas；The first measurement light that first detector is used to pass through complex environment is converted to the first electric signal, and is transmitted to analysis module；The second measurement light that second detector is used to pass through complex environment is converted to the second electric signal, and is transmitted to the analysis module；Analysis module handles the second electric signal received according to absorption spectroscopy techniques, to obtain the content of strong jamming gas, and the classification and content of weakly-absorbing gas is known according to the content of difference absorption spectrum technology, strong jamming gas.The present invention has many advantages, such as that precision is high, structure is simple, low cost.
Description
Technical field
The present invention relates to photoelectric analysis, in particular to the detection device and method of weakly-absorbing gas in complex environment.
Background technique
Benzene homologues typically refer to benzene, toluene, ethylbenzene, dimethylbenzene and other substituted benzene compounds, to be colourless with special
The liquid of aromatic odor is widely used heavy in the fields such as organic chemical industry, pesticide, medicine, the paint of house decoration and coating
Solvent is wanted, due to its high volatile, these benzene homologues are present in atmosphere in the form of steam at normal temperature；In addition, motor-driven vehicle
Also a large amount of benzene homologues gas can be discharged in gas, smoking and various combustion processes, they easily pass through respiratory system or skin
It is absorbed by the body, harmful to human nervous system or even carcinogenic, teratogenesis, mutagenesis.Therefore to the detections of the benzene homologues in air and
Research receives extensive attention, and the discharge standard of corresponding permission has all been formulated in every country and area.Currently, benzene homologues in gas
Detection method mainly have:
1. gas chromatography, which is that " benzene, toluene and dimethylbenzene are hygienic in the atmosphere of residential area for chinese national standard
Test stone method " as defined in standard method.As described in patent CN104597158A, CN103675134A, this method is basic
Principle are as follows: by absorption enrichment, desorption, be re-fed into chromatograph-mas spectrometer analysis.CN101923076A,CN104597182A
Also disclose the method using gas chromatographic analysis benzene homologues.This method has the deficiencies of instrument is complicated, at high cost.
2. sensor method, as disclosed in patent CN101713763A, using to the special sensitive ionic liquid of benzene homologues as
The sensitive coating material for sensing sensing element or resonator induction zone, using measured matter in induction region surface reversibly physics
Selective absorption/desorption is realized by the variation of sensor output frequency signal in measurement mechanism to measurement
Continuous, the real-time detection of object.Patent CN203720165U, CN202903774U also discloses similar sensor type benzene homologues
Detector.This method has the deficiencies of difficult processing, at high cost.
3. ionization method, as shown in Figure 1, patent CN2438123Y discloses a kind of benzene homologues fast detector, by sample introduction source,
Vacuum chamber and the ionized region being placed in vacuum chamber and ion detector form, and ionized region is parallel by different distance by three pieces of pole plates
Respectively added with high direct voltage, electrode 3 is zero potential for arrangement, electrode 1 and electrode 2, is formd between electrode 1 and electrode 2 as ionization
Area is accelerating region between electrode 2 and electrode 3, is field-free region behind electrode 3.It is ionized when sample gas enters ionized region by ultraviolet laser
Afterwards, the benzene homologues ion for obtaining identical energy under electric field action is selected, since their quality is different, successively reaches ion
The time of detector 6 is also different, goes out the substances such as the benzene,toluene,xylene ionized simultaneously through 7 sorting of instantaneous state recorder.The party
Method has the deficiencies of instrument is complicated, at high cost.
DOAS technology (differential optical absorption spectroscopy difference absorption spectrum)
Basic principle are as follows: absorption of the various weak absorbing polluted gas ingredients in Uv and visible light wave band when being propagated in gas by light
Spectral signature comes its type of inverting and concentration, to realize the continuous real time on-line monitoring to a variety of polluted gas.Due to DOAS
Technology has many advantages, such as multiple gases while detecting, and is widely used in flue gas discharge continuous monitoring system.
The ingredient of atmosphere is very complicated, and especially domestic automobile and industrial circle discharge a large amount of benzene homologues, volatilization in recent years
Property organic matter VOCs.By taking the detection of weak absorbing benzene homologues in an atmosphere as an example, characteristic absorption mostly within the scope of 250-290nm,
But when DOAS technology to be used for the measurement of the benzene homologues such as the benzene,toluene,xylene in atmosphere, it is found that inversion result and reality are partially
Difference is very big, and reason is unknown.
Summary of the invention
To solve the deficiency in above-mentioned prior art, the present invention provides a kind of precision height, structure are simple, inexpensive
Complex environment in weakly-absorbing gas detection device.
The purpose of the present invention is what is be achieved through the following technical solutions:
The detection device of weakly-absorbing gas, the detection device include: in a kind of complex environment
The wavelength of first light source, the first measurement light that the first light source issues covers the absorption spectra of the weakly-absorbing gas
Line；
The wavelength of second light source, the second measurement light that the second light source issues covers strong jamming gas in the complex environment
The absorption line of the absorption line different from the weakly-absorbing gas of body；In the weakly-absorbing gas of the first measurement light
Absorption region in, the absorption of strong jamming gas is greater than 10 times of (opposite and weakly-absorbing gas of the absorption of the weakly-absorbing gas
For, the absorption of interference gas is to absorb by force)；
First detector, the first measurement light that first detector is used to pass through the complex environment are converted to first
Electric signal, and it is transmitted to analysis module；
Second detector, the second measurement light that second detector is used to pass through the complex environment are converted to second
Electric signal, and it is transmitted to the analysis module；
Analysis module, the analysis module handle second electric signal received according to absorption spectroscopy techniques, thus
The content of strong jamming gas is obtained, and the weak suction is known according to the content of difference absorption spectrum technology, the strong jamming gas
The classification and content of getter body.
According to above-mentioned detection device, it is preferable that the weakly-absorbing gas is benzene homologues, and the strong jamming gas is oxygen
The wavelength of gas, the first measurement light covers 250-290nm.
According to above-mentioned detection device, optionally, first detector further comprises:
Spectral module, the first measurement light that the spectral module is used to pass through the complex environment are spatially separated；
Photoelectric converter array, the photoelectric converter array are used to the monochromatic light after light splitting being converted to the first telecommunications
Number.
According to above-mentioned detection device, optionally, the detection device further comprises:
Coupling module, first coupling module are used to the first measurement light and second measuring optical coupling into the first light
Fibre enters in the complex environment from the light emission of first optical fiber output；
Beam splitting module, the beam splitting module are used to project the first measurement light and the second measurement light point of the complex environment
The second optical fiber, third optical fiber are not inputted；Second optical fiber, third optical fiber downstream be respectively set the first detector, second visit
Survey device.
According to above-mentioned detection device, it is preferable that the second light source is tunable laser.
The object of the invention is also to provide a kind of detection methods of weakly-absorbing gas in complex environment with high accuracy, should
Goal of the invention is achieved by the following technical programs:
The detection method of weakly-absorbing gas in complex environment, described detection method includes the following steps:
(A1) the corresponding absorption line of selection weakly-absorbing gas, at the corresponding absorption line of the weakly-absorbing gas, by force
Interference gas, which has, to be absorbed, and in the absorption region of the weakly-absorbing gas, the absorption of strong jamming gas is greater than the weak absorbing
10 times of the absorption of gas；
Select the absorption line of the absorption line different from the weakly-absorbing gas of the strong jamming gas；
(A2) the first measurement light that first light source issues passes through the complex environment, by weakly-absorbing gas and strong jamming gas
It absorbs, the first electric signal is converted to by the first detector later, and send analysis module；
The second measurement light that second light source issues passes through the complex environment, in the suction for the strong jamming gas selected
It receives and is absorbed at spectral line by strong jamming gas, the second electric signal is converted to by the second detector later, and send analysis module；
(A3) analysis module handles second electric signal received according to absorption spectroscopy techniques, to obtain strong jamming
The content of gas, and know according to the content of difference absorption spectrum technology, the strong jamming gas class of the weakly-absorbing gas
Other and content.
According to above-mentioned detection method, it is preferable that the weakly-absorbing gas is benzene homologues, and the strong jamming gas is oxygen
The wavelength of gas, the first measurement light covers 250-290nm.
According to above-mentioned detection method, it is preferable that the wavelength of the corresponding absorption line of oxygen is 760nm.
According to above-mentioned detection method, optionally, in step (A2), the first measurement light and the second measurement light pass through respectively
Optical fiber is transferred to coupler, and is coupled into the first optical fiber.
According to above-mentioned detection method, it is preferable that in step (A2), the analysis module is absorbed according to tunable laser
The second electric signal that spectral technique processing receives.
Compared with prior art, the device have the advantages that are as follows:
1. detection accuracy is high
By type, content and the corresponding absorption line of gas of gas in the complex environments such as analysis atmosphere, in weak suction
In the wave band of the corresponding absorption line of getter body, the strong jamming gas that absorbs by force there is some (it is opposite with weakly-absorbing gas and
Speech, the absorption of strong jamming gas is to absorb by force), seriously disturb the application of DOAS technology；Utilize high-precision, quick laser
Absorption spectroscopy techniques detect the content of strong jamming gas, recycle DOAS technology to deduct the interference of strong jamming gas, thus accurately
Ground measures the classification and content of the gases such as weak absorbing benzene homologues in the complex environments such as atmosphere；
2. structure is simple, low cost
Utilize the optical path of original DOAS technology, it is only necessary to the laser light source, detector and analysis module of technology maturation is added,
Without changing original optical path, the real-time continuous measurement of DOAS system is not influenced.
Detailed description of the invention
Referring to attached drawing, the disclosure of the present invention will become more readily understood.Skilled addressee readily understands that: this
It is only used to illustrate the technical scheme of the present invention for a little attached drawings, and is not intended to limit the scope of protection of the present invention.
In figure:
Fig. 1 is the structure diagram of benzene homologues fast detector according to prior art；
Fig. 2 is the flow chart of according to embodiments of the present invention 1 detection method.
Specific embodiment
Fig. 2 and following description describe optional embodiment of the invention with instruct those skilled in the art how to implement and
Reproduce the present invention.In order to teach the technical scheme of the invention, it has simplified or omitted some conventional aspects.Those skilled in the art answer
The variation or replacement that the understanding is originated from these embodiments will within the scope of the invention.Under those skilled in the art should understand that
Stating feature can combine in various ways to form multiple modifications of the invention.The invention is not limited to following optional as a result,
Embodiment, and be only limited by the claims and their equivalents.
Embodiment 1:
The detection device of Determination of Trace Benzene in the room air of the embodiment of the present invention, the detection device include:
The wavelength of xenon lamp, the ultraviolet light that the xenon lamp issues includes 250-290nm, covers the corresponding characteristic absorption of benzene homologues
Spectral line；
Semiconductor laser with tunable and its driving, the light that the laser issues correspond to the characteristic absorpting spectruming line of oxygen
760nm；In the absorption bands 250-290nm of benzene homologues, the absorption of oxygen is greater than the 10 of the absorption of benzene homologues in room air
Times；
Coupler, the measurement light that the xenon lamp and laser issue pass through optical fiber input coupler respectively, and are coupled into the
One optical fiber；
White pond, the emergent light of the first optical fiber multiple reflections in White pond after overconvergence, is passed into White pond
Weak absorbing benzene homologues in room air, oxygen absorption enter beam splitter after the light being emitted from White pond is concentrated, separate two beams
Light is transmitted by the second optical fiber, third optical fiber respectively；
The end of the second optical fiber, including spectral module (such as grating), light is arranged in first detector, first detector
First electric signal of electric transducer array (such as line array CCD, CMOS), the array output send analysis module；
The end of third optical fiber is arranged in second detector, second detector, and the second electric signal of output send analysis
Module；
Analysis module, the analysis module handle second electric signal received according to laser absorption spectroscopy,
To obtain the content of oxygen in room air, and the benzene is known according to the content of difference absorption spectrum technology, the oxygen
It is the classification and content of object.
Fig. 2 schematically illustrates the flow chart of the detection method of weak absorbing benzene homologues in the room air of the present embodiment,
Namely the application of above-mentioned detection device, as shown in Fig. 2, described, detection method includes the following steps:
(A1) the corresponding absorption line of weak absorbing (trace) benzene homologues in room air is selected, in the absorption of the benzene homologues
At spectral line, the oxygen of room air middle and high concentration has strong absorption, and in the absorption region of the benzene homologues, the absorption of oxygen is big
In 10 times of the absorption of the weak absorbing benzene homologues；
It is selected as the absorption line of the oxygen of strong jamming gas, such as 760nm；
(A2) by optical fiber input coupler, the light that laser issues is inputted the first measurement light that xenon lamp issues by optical fiber
The coupler is coupled into the first optical fiber through coupler, and the emergent light of the first optical fiber enters in White pond and more after overconvergence
Secondary reflection is passed into weak absorbing benzene homologues in the room air in White pond, oxygen absorption, and the light being emitted from White pond is through meeting
Enter beam splitter after poly-, separate two-beam, is transmitted respectively by the second optical fiber, third optical fiber；
The end of the second optical fiber is arranged in first detector, including spectral module (such as grating), photoelectric converter array are (such as
Line array CCD, CMOS), the first electric signal of the array output send analysis module；
The end of third optical fiber is arranged in second detector, and the second electric signal of output send analysis module；
(A3) analysis module handles second electric signal received according to laser absorption spectroscopy, to obtain room
The content of oxygen in interior air, and know according to the content of difference absorption spectrum technology, the oxygen classification of the benzene homologues
And content, specifically: the second electric signal of TDLAS technical treatment is utilized, knows oxygen molecule quantity on detection path, and then obtain
Absorption spectrum of the oxygen within the scope of 250-290nm, then with the optical transfer function convolution of the first detector, obtain and deduct spectrum,
The spectrum after deducting spectrum is finally subtracted you can learn that the benzene according to DOAS technical treatment (the first detector obtains) DOAS spectrum
It is the classification and content of object.
Embodiment 2:
The detection device of Determination of Trace Benzene in the atmosphere of the embodiment of the present invention, the detection device include:
The wavelength of deuterium lamp, the ultraviolet light that the deuterium lamp issues includes 250-290nm, covers the corresponding characteristic absorption of benzene homologues
Spectral line；
Semiconductor laser with tunable and its driving, the light that the laser issues correspond to the characteristic absorpting spectruming line of oxygen
760nm；In 250-290nm, the absorption of oxygen is greater than 10 times of the absorption of benzene homologues；
Coupler, the measurement light that the xenon lamp and laser issue pass through optical fiber input coupler respectively, and are coupled into the
One optical fiber；
The return structure of light, the structure includes concave mirror, is successively in concave mirror side and reflecting surface is opposite
The first reflecting mirror, the second reflecting mirror, corner reflector being arranged, the concave mirror have exit window, and the first reflecting mirror is perpendicular
Straight setting, the second mirror tilt setting, so that the light of the first optical fiber of output is after the reflection of the second reflecting mirror, in open type knot
Roundtrip between above-mentioned reflecting mirror in structure is finally emitted from the exit window, is transferred to fiber optic splitter by optical fiber, point
Two-beam out is transmitted by the second optical fiber, third optical fiber respectively；
The end of the second optical fiber, including spectral module (such as grating), light is arranged in first detector, first detector
First electric signal of electric transducer array (such as line array CCD, CMOS), the array output send analysis module；
The end of third optical fiber is arranged in second detector, second detector, and the second electric signal of output send analysis
Module；
Analysis module, the analysis module handle second electric signal received according to laser absorption spectroscopy,
To obtain the content of atmospheric oxygen, and the benzene homologues are known according to the content of difference absorption spectrum technology, the oxygen
Classification and content.
The application of the detection method namely above-mentioned detection device of weak absorbing benzene homologues, the inspection in the atmosphere of the present embodiment
Survey method the following steps are included:
(A1) the corresponding absorption line of weak absorbing benzene homologues in atmosphere is selected, at the absorption line of the benzene homologues, greatly
The oxygen of gas middle and high concentration have it is strong absorb, in the absorption region of the weak absorbing benzene homologues, wherein oxygen absorption it is big
In 10 times of the absorption of the weak absorbing benzene homologues；
It is selected as the absorption line of the oxygen of strong jamming gas, such as 760nm；
(A2) by optical fiber input coupler, the light that laser issues is inputted the first measurement light that deuterium lamp issues by optical fiber
The coupler is coupled into the first optical fiber through coupler, and the emergent light of the first optical fiber enters the return structure of light after overconvergence,
Roundtrip in the return structure of light is finally emitted from the exit window of concave mirror, is transferred to beam splitter by optical fiber, separates
Two-beam is transmitted by the second optical fiber, third optical fiber respectively；
The end of the second optical fiber is arranged in first detector, including spectral module (such as grating), photoelectric converter array are (such as
Line array CCD, CMOS), the first electric signal of the array output send analysis module；
The end of third optical fiber is arranged in second detector, and the second electric signal of output send analysis module；
(A3) analysis module handles second electric signal received according to laser absorption spectroscopy, to obtain big
The content of oxygen in gas, and the classification of the benzene homologues is known according to the content of difference absorption spectrum technology, the oxygen and is contained
Amount, specifically: the second electric signal of TDLAS technical treatment is utilized, knows oxygen molecule quantity on detection path, and then obtain oxygen
Absorption spectrum within the scope of 250-290nm, then with the optical transfer function convolution of the first detector, obtain and deduct spectrum, finally
Subtract the spectrum after deducting spectrum according to DOAS technical treatment (first detector obtains) DOAS spectrum you can learn that benzene homologues class
Other and content.
Embodiment 3:
The structure diagram of the detection device of the benzene homologues of the embodiment of the present invention, unlike the first embodiment:
1, optical fiber, coupler and fiber optic splitter are not used, but uses the slide being obliquely installed, the purple that xenon lamp issues
Outer light is injected in White pond after passing through slide, and the light that laser issues is injected after the reflection of slide in the White pond；Together
Reason, when measuring light emission and going out White pond also using the slide being obliquely installed, ultraviolet light passes through the slide and is connect by the first detector
It receives, laser is received after being reflected by the slide by the second detector.In order to enhance the transmission of ultraviolet light and the reflection of laser, above-mentioned
Ultraviolet light anti-reflection film and laser Anti-reflective coating are plated on slide.
2, in the absorption region of benzene homologues, the nitrogen dioxide having in complex environment has strong absorption, is more than benzene series
10 times or more of object, therefore the interference of nitrogen dioxide need to be excluded.Semiconductor laser issues the laser of 680nm, corresponds to titanium dioxide
The absorption line of nitrogen.
Above-described embodiment is only the case where illustratively giving detection atmosphere, Indoor Air Benzene system object, may be used also certainly
In other cases with application.Essence of the invention is that: in complex environment, if the corresponding absorption line of weakly-absorbing gas
When there is the absorption of the strong strong jamming gas for absorbing and (compared with weakly-absorbing gas, being such as not less than 10 times) in wave band, it can be used
Technical solution of the present invention knows the content of strong jamming gas using high-precision laser absorption spectroscopy, recycles difference
Absorption spectroscopy techniques deduct the absorption of strong jamming gas, to obtain the classification and content of weakly-absorbing gas.
Claims (10)
1. the detection device of weakly-absorbing gas in a kind of complex environment, it is characterised in that: the detection device includes:
The wavelength of first light source, the first measurement light that the first light source issues covers the absorption line of the weakly-absorbing gas；
The wavelength of second light source, the second measurement light that the second light source issues covers strong jamming gas in the complex environment
Different from the absorption line of the absorption line of the weakly-absorbing gas；In the suction of the weakly-absorbing gas of the first measurement light
It receives in region, the absorption of strong jamming gas is greater than 10 times of the absorption of the weakly-absorbing gas；
First detector, the first measurement light that first detector is used to pass through the complex environment are converted to the first telecommunications
Number, and it is transmitted to analysis module；
Second detector, the second measurement light that second detector is used to pass through the complex environment are converted to the second telecommunications
Number, and it is transmitted to the analysis module；
Analysis module, the analysis module handles second electric signal received according to absorption spectroscopy techniques, to obtain
The content of strong jamming gas, and the weak absorbing gas is known according to the content of difference absorption spectrum technology, the strong jamming gas
The classification and content of body；Concrete mode are as follows:
The weakly-absorbing gas that strong jamming gas measures light described first is obtained according to the content of the strong jamming gas
Absorption spectrum within the scope of absorption region, then with the optical transfer function convolution of the first detector, obtain and deduct spectrum, last basis
The spectrum that the first detector of difference absorption spectrum technical treatment obtains subtracts the spectrum deducted after spectrum, to know described weak
Absorb the classification and content of gas.
2. detection device according to claim 1, it is characterised in that: the weakly-absorbing gas is benzene homologues, described capable and experienced
Disturbing gas is oxygen, and the wavelength of the first measurement light covers 250-290nm.
3. detection device according to claim 1, it is characterised in that: first detector further comprises:
Spectral module, the first measurement light that the spectral module is used to pass through the complex environment are spatially separated；
Photoelectric converter array, the photoelectric converter array are used to the monochromatic light after light splitting being converted to the first electric signal.
4. detection device according to claim 1, it is characterised in that: the detection device further comprises:
Coupling module, the coupling module are used for the first measurement light and the second measurement optical coupling into the first optical fiber, from institute
The light emission for stating the first optical fiber output enters in the complex environment；
Beam splitting module, first measurement light and second measurement light difference of the beam splitting module for that will project the complex environment are defeated
Enter the second optical fiber, third optical fiber；Second optical fiber, third optical fiber downstream the first detector, the second detector is respectively set.
5. detection device according to claim 1, it is characterised in that: the second light source is tunable laser.
6. the detection method of weakly-absorbing gas in complex environment, described detection method includes the following steps:
(A1) the corresponding absorption line of selection weakly-absorbing gas, at the corresponding absorption line of the weakly-absorbing gas, strong jamming
Gas, which has, to be absorbed, and in the absorption region of the weakly-absorbing gas, the absorption of strong jamming gas is greater than the weakly-absorbing gas
10 times of absorption；
Select the absorption line of the absorption line different from the weakly-absorbing gas of the strong jamming gas；
(A2) the first measurement light that first light source issues passes through the complex environment, is inhaled by weakly-absorbing gas and strong jamming gas
It receives, the first electric signal is converted to by the first detector later, and send analysis module；
The second measurement light that second light source issues passes through the complex environment, in the absorption spectra for the strong jamming gas selected
It is absorbed at line by strong jamming gas, the second electric signal is converted to by the second detector later, and send analysis module；
(A3) analysis module handles second electric signal received according to absorption spectroscopy techniques, to obtain strong jamming gas
Content, and according to the content of difference absorption spectrum technology, the strong jamming gas know the weakly-absorbing gas classification and
Content, concrete mode are as follows:
The weakly-absorbing gas that strong jamming gas measures light described first is obtained according to the content of the strong jamming gas
Absorption spectrum within the scope of absorption region, then with the optical transfer function convolution of the first detector, obtain and deduct spectrum, last basis
The spectrum that the first detector of difference absorption spectrum technical treatment obtains subtracts the spectrum deducted after spectrum, to know described weak
Absorb the classification and content of gas.
7. detection method according to claim 6, it is characterised in that: the weakly-absorbing gas is benzene homologues, described capable and experienced
Disturbing gas is oxygen, and the wavelength of the first measurement light covers 250-290nm.
8. detection method according to claim 7, it is characterised in that: the wavelength of the corresponding absorption line of oxygen is 760nm.
9. detection method according to claim 6, it is characterised in that: in step (A2), the first measurement light and second is surveyed
Amount light passes through optical fiber respectively and is transferred to coupler, and is coupled into the first optical fiber.
10. detection method according to claim 6, it is characterised in that: in step (A2), the analysis module is according to can
The second electric signal that the processing of tuning laser absorption spectroscopy techniques receives.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510275612.6A CN104880434B (en) | 2015-05-26 | 2015-05-26 | The detection device and method of weakly-absorbing gas in complex environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510275612.6A CN104880434B (en) | 2015-05-26 | 2015-05-26 | The detection device and method of weakly-absorbing gas in complex environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104880434A CN104880434A (en) | 2015-09-02 |
| CN104880434B true CN104880434B (en) | 2019-08-20 |
Family
ID=53948011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510275612.6A Active CN104880434B (en) | 2015-05-26 | 2015-05-26 | The detection device and method of weakly-absorbing gas in complex environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104880434B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425808B (en) * | 2015-11-10 | 2018-07-03 | 上海禾赛光电科技有限公司 | Machine-carried type indoor gas telemetry system and method |
| CN108918441B (en) * | 2015-11-25 | 2020-11-03 | 上海禾赛科技股份有限公司 | Gas remote measuring method and device |
| CN106018314A (en) * | 2016-06-30 | 2016-10-12 | 杭州泽天科技有限公司 | Multi-band multi-gas detection device and method |
| CN109100317A (en) * | 2018-09-11 | 2018-12-28 | 杭州因诺维新科技有限公司 | Photo-electric gas monitoring system and method |
| CN114324209A (en) * | 2021-12-29 | 2022-04-12 | 杭州谱育科技发展有限公司 | Fluid detection device and method based on absorption spectrum technology |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1439880A (en) * | 2003-01-21 | 2003-09-03 | 中国科学院安徽光学精密机械研究所 | Method and apparatus for real time remote determining multiple pollutants in vehicle exhaust |
| CN2695957Y (en) * | 2003-11-14 | 2005-04-27 | 上海波汇通信科技有限公司 | Differential absorption fibre-optical methane gas sensor |
| CN101460829A (en) * | 2006-04-19 | 2009-06-17 | 光学传感公司 | Measuring water vapor in hydrocarbons |
| CN102495021A (en) * | 2011-12-12 | 2012-06-13 | 山东大学 | System and method for detecting trace amount of steam based on two absorption peaks |
| CN104007069A (en) * | 2014-05-20 | 2014-08-27 | 中国科学院合肥物质科学研究院 | Differential optical absorption spectroscopy measurement system based on off-axis paraboloid mirror |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002082016A (en) * | 2000-09-06 | 2002-03-22 | Ando Electric Co Ltd | Tunable light source device |
| EP1286154A4 (en) * | 2001-01-30 | 2006-04-12 | Anritsu Corp | Laser absorption spectral diffraction type gas detector and method for gas detection using laser absorption spectral diffraction |
| JP5936529B2 (en) * | 2012-12-14 | 2016-06-22 | 三菱重工業株式会社 | Gas leak detection system |
-
2015
- 2015-05-26 CN CN201510275612.6A patent/CN104880434B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1439880A (en) * | 2003-01-21 | 2003-09-03 | 中国科学院安徽光学精密机械研究所 | Method and apparatus for real time remote determining multiple pollutants in vehicle exhaust |
| CN2695957Y (en) * | 2003-11-14 | 2005-04-27 | 上海波汇通信科技有限公司 | Differential absorption fibre-optical methane gas sensor |
| CN101460829A (en) * | 2006-04-19 | 2009-06-17 | 光学传感公司 | Measuring water vapor in hydrocarbons |
| CN102495021A (en) * | 2011-12-12 | 2012-06-13 | 山东大学 | System and method for detecting trace amount of steam based on two absorption peaks |
| CN104007069A (en) * | 2014-05-20 | 2014-08-27 | 中国科学院合肥物质科学研究院 | Differential optical absorption spectroscopy measurement system based on off-axis paraboloid mirror |
Non-Patent Citations (1)
| Title |
|---|
| 广州市交通主干道空气中苯系物的测量;叶丛雷等;《环境科学》;20121115;第33卷(第11期);第3718-3724页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104880434A (en) | 2015-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104880434B (en) | The detection device and method of weakly-absorbing gas in complex environment | |
| Young et al. | Infrared hollow waveguide sensors for simultaneous gas phase detection of benzene, toluene, and xylenes in field environments | |
| Fang et al. | Portable broadband cavity-enhanced spectrometer utilizing Kalman filtering: application to real-time, in situ monitoring of glyoxal and nitrogen dioxide | |
| CA3025276C (en) | Measuring device and method for sensing different gases and gas concentrations | |
| CN105319178B (en) | Motor-vehicle tail-gas CO and CO2Concentration real-time detecting system and its control method | |
| Rohwedder et al. | iHWG-μNIR: a miniaturised near-infrared gas sensor based on substrate-integrated hollow waveguides coupled to a micro-NIR-spectrophotometer | |
| CN101109701A (en) | On-line detecting method and apparatus for multi-component gas | |
| CN101819140A (en) | Continuous monitoring device and method of gaseous elemental mercury concentration | |
| CN105765381A (en) | Method and system for gas concentration measurement of gas dissolved in liquids | |
| Sun et al. | Stack emission monitoring using non-dispersive infrared spectroscopy with an optimized nonlinear absorption cross interference correction algorithm | |
| CN105911022A (en) | Hazardous chemical substance remote sensing detection method and device based on wide-tuning external cavity quantum cascade laser | |
| KR101606785B1 (en) | Terahertz spectrometer for gas analysis | |
| US20090302230A1 (en) | Use of a Broad Band UV Light Source for Reducing The Mercury Interference in Ozone Measurements | |
| Chandran et al. | Near infrared cavity enhanced absorption spectra of atmospherically relevant ether-1, 4-Dioxane | |
| Darby et al. | Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements | |
| Blohm et al. | Detection of gas molecules by means of spectrometric and spectroscopic methods | |
| CN102192892A (en) | Infrared spectroscopy | |
| Dixneuf et al. | Detection of nitrous acid in the atmospheric simulation chamber SAPHIR using open-path incoherent broadband cavity-enhanced absorption spectroscopy and extractive long-path absorption photometry | |
| Sun et al. | Industrial SO 2 emission monitoring through a portable multichannel gas analyzer with an optimized retrieval algorithm | |
| CN111912804B (en) | Ultraviolet spectrum detection method and device for monitoring trace sulfur dioxide in blast furnace flue gas | |
| KR102200595B1 (en) | NDIR Analyzer With A Compact Type Reference Chamber | |
| US9030666B2 (en) | Non-dispersive gas analyzer | |
| Chen et al. | Broadband optical cavity methods | |
| CN109270004A (en) | Atmospheric analysis detection system and detection method based on DOAS and LIBS technology | |
| Ioana et al. | Methods for online monitoring of air pollution concentration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No.2 building, no.468 xinlai Road, Jiading District, Shanghai, 201821 Patentee after: Shanghai Hesai Technology Co., Ltd Address before: Room 306, building A4, 925 Yecheng Road, Jiading District, Shanghai, 201821 Patentee before: HESAI PHOTONICS TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No.2 building, no.468 xinlai Road, Jiading District, Shanghai, 201821 Patentee after: Shanghai Hesai Technology Co.,Ltd. Address before: No.2 building, no.468 xinlai Road, Jiading District, Shanghai, 201821 Patentee before: Shanghai Hesai Technology Co., Ltd |
|
| CP01 | Change in the name or title of a patent holder |