CN108459005A - A kind of laser gas Raman spectrum detection system based on forward scattering orientation detection - Google Patents
A kind of laser gas Raman spectrum detection system based on forward scattering orientation detection Download PDFInfo
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- CN108459005A CN108459005A CN201810256186.5A CN201810256186A CN108459005A CN 108459005 A CN108459005 A CN 108459005A CN 201810256186 A CN201810256186 A CN 201810256186A CN 108459005 A CN108459005 A CN 108459005A
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- chamber mirror
- gas
- lens
- high pressure
- prism
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N21/65—Raman scattering
- G01N21/658—Raman scattering enhancement Raman, e.g. surface plasmons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
Abstract
The present invention relates to gas detection method, especially a kind of laser gas Raman spectrum detection system based on forward scattering orientation detection.Including left chamber mirror, right chamber mirror, high pressure helium neon tube, prism, lens, interference spectroscope and gas compartment, left chamber mirror and high pressure helium neon tube are placed in gas compartment left, prism and right chamber mirror are placed in gas compartment, interference spectroscope and lens are placed in gas compartment right, left chamber mirror, high pressure helium neon tube, prism, right chamber mirror and lens be sequentially placed from left to right and central point on the same axis, interference spectroscope is placed on the right side of lens；High pressure helium neon tube both ends band Brewster window, the upside connection air inlet pipe of gas compartment, downside connect escape pipe, and lens centre position is provided with black absorption film.The present invention is based on forward scattering orientation detections, increase luminous flux, signal is made to be enhanced；This detecting system can On-line sampling system multiple gases, there is the features such as compact-sized, stability is good, and reliability is high, and detection result is excellent.
Description
Technical field
The invention belongs to oil, natural gas exploration and development fields, are related to gas detection method, it is especially a kind of based on it is preceding to
Scatter the laser gas Raman spectrum detection system of orientation detection.
Background technology
The energy is the important foundation of China's socio-economic development, and well logging is oil-gas exploration and development " eyes ", gas detection
Technology is the key technology of well logging.Oil, there is a large amount of mixed gas for the exploitation of the energy such as natural gas, how effectively will
It is the key that in oil-gas mining that gas with various detection, which is separated, in air-fuel mixture gas.The purpose of gas detection mainly has following
3 points：First, directly finding oil-gas Layer；Second is that carrying out the monitoring and warning of toxic and harmful gas；Third, finding non-hydrocarbon gases.
Traditional Multi-Component Gas Analyzing method has：Gas chromatography, infrared spectroscopy, ultraviolet difference photometry,
Analysis of thermal conductivity method and using various electrochemical gas sensors as the electrochemical methods of representative, these methods are mostly difficult to together
Shi Shixian while organic and inorganic gas to detecting.Wherein gas chromatography needs to carry out separation richness to gas using chromatographic column
Collection, it is time-consuming, laborious, costly, and consumptive material needed for instrument is numerous, it is complicated to safeguard, leads to its detection efficiency deviation, it is difficult to meet work
The demand that industry gas detects in real time.Infrared spectroscopy and ultraviolet difference photometry can not detect non-polar gas ingredient, and
Analysis of thermal conductivity method is non-specific physical detection technology, and sensor application range is relatively narrow, and pot life factor is more, can not
Meet the multicomponent of the especially complicated gas of industrial gasses while detecting.Electrochemical gas sensor is although small, price
It is low, but it is not high to the resolution of gas, and environmental gas interference is often subject in use and the case where wrong report, fail to report occurs, and
Sensor is easily poisoned, service life is low, therefore cannot be satisfied the required precision of industrial gasses detection.
Raman spectroscopy is generated scattering after research compound molecule light irradiation, scatters light and incident optical energy is differential
With compound vibration frequency, the analysis method of the relationship of rotational frequency.Similar with infrared spectrum, Raman spectrum is a kind of vibration light
Spectral technology.The difference is that the former is related to dipole moment variation when molecular vibration, and Ramam effect is then molecular polarizability change
As a result, be measured be stiff scattering spoke.Raman spectrum analysis technology is widely used to the identification of substance at present, point
The research spectral line characteristic of minor structure, nearly all substance comprising true molecular link may be used to Raman spectrum analysis, i.e.,
Solid, powder, ointment, liquid, colloid and gas can be analyzed using Raman spectrum.In laser gas Raman spectrum skill
It in art, needs the gas detected to be mixed with laser and generates Raman signal, mixed light is collected by detecting module, detecting module processing
Computer analysis is sent to generate Raman spectrogram after signal, by analyzing Raman spectrogram, you can obtain the molecule of detected gas
Structure knows gas with various ingredient.
In existing laser gas Raman detection system, it is low there are sampling precision caused by range narrow range the problems such as, by
It is a pole weak signal in Raman signal, range ability detection limit concentration can only achieve 10 ppm, therefore cause sampling precision low
The problem of.If need to be detected under the extremely low environment of gas concentration and content, need the limting concentration detected that need to be promoted several
Ten ppm.The content of contained other non-hydrocarbon gases is usually extremely low in oil, natural gas, existing laser gas Raman spectrum
Detection technique still cannot be satisfied the ability of detection trace gas.
Invention content
For the above deficiency, the laser gas Raman spectrum inspection based on forward scattering orientation detection that the present invention provides a kind of
Examining system can effectively enhance raman spectral signal, the detection of trace non-hydrocarbon gases suitable for oil, natural gas.
The technical scheme is that：
A kind of laser gas Raman spectrum detection system based on forward scattering orientation detection, including left chamber mirror, right chamber mirror, high pressure
He-Ne pipe, prism, lens, interference spectroscope and gas compartment, the left chamber mirror and high pressure helium neon tube are placed in gas compartment left, and three
Prism and right chamber mirror are placed in gas compartment, and interference spectroscope and lens are placed in gas compartment right, left chamber mirror, high pressure helium neon tube, three
Prism, right chamber mirror and lens be sequentially placed from left to right and central point on the same axis, interference spectroscope be placed in lens the right side
Side；High pressure helium neon tube both ends band Brewster window, the upside connection air inlet pipe of the gas compartment, downside connect escape pipe,
The lens centre position is provided with black absorption film.
The black absorption film is circle, radius 2mm.
The interference spectroscope, which is positioned over, deviates left chamber mirror, high pressure helium neon tube, prism, right chamber mirror and lens centre point institute
In 10 ° of position of axis.
The prism center is 260mm at a distance from gas compartment left wall, and the centre distance of prism and right chamber mirror is
50mm。
The high pressure helium neon tube generation wavelength is the laser of 632.8nm.
The beneficial effects of the present invention are：
1, in conjunction with forward scattering orientation detection, signal strength is improved, is suitable for the detection of trace gas；
2, active cavity is enhanced into technology and Raman gas detection technique is combined, using active cavity, avoid the structure of passive cavity
Loosely；
3, Raman diffused light is collected using interference spectroscope, broadens collect range, improves luminous flux；
4, system has the characteristics that Raman spectroscopy and high-precision detect, energy while on-line measurement multiple gases, and carries out reality
When on-line analysis；
5, whole system is compact, and reliability is high, and detection result is excellent, there is preferable operability.
Description of the drawings
Fig. 1 is that the present invention is based on the structure charts of the laser gas Raman spectrum detection system of forward scattering orientation detection.
Specific implementation mode
The technique effect of the design of the present invention, concrete structure and generation is described further below with reference to attached drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
With reference to figure 1, the laser gas Raman spectrum detection system of the invention based on forward scattering orientation detection, including a left side
Hysteroscope 1, right chamber mirror 2, high pressure helium neon tube 3, prism 4, interference spectroscope 5, gas compartment 6 and lens 7, left chamber mirror 1 and high pressure helium
Neon tube 3 is placed in 6 left of gas compartment, and prism 4 and right chamber mirror 2 are placed in gas compartment 6, and interference spectroscope 5 and lens 7 are placed in gas
6 right of room, 4 center of prism are 260mm at a distance from 6 left wall of gas compartment, and the centre distance with right chamber mirror 2 is 50mm.Left chamber
Mirror 1, high pressure helium neon tube 3, prism 4, right chamber mirror 2 and lens 7 be sequentially placed from left to right and central point on the same axis；
Interference spectroscope 5 is placed in 7 right side of lens, and 3 both ends of high pressure helium neon tube band Brewster window 301, upper and lower side is equipped with magnet steel 302, gas
The upside connection air inlet pipe 601 of body room 6, downside connect escape pipe 602, and 7 centre of lens is provided with circular black absorbing film
701。
The present invention generates laser, Brutus window of the laser through left side of output using active resonant cavity high pressure helium neon tube 3
301 reach left chamber mirror 1, and Brewster window 301 has filtered out the S-polarization light in laser, and light is made to be converted to linearly polarized light；Laser quilt
Enter gas compartment 6 by high pressure He-Ne pipe 3,301 vertical incidence of Brewster window through right side after the reflection of left chamber mirror 1, entrance
Laser reaches right chamber mirror 2 through prism 4, and prism 4 generates dispersion to light by frequency, separates the polarised light of each frequency, have
Modeling acts on；Laser is reflected by right chamber mirror 2, is reflected back again in high pressure helium neon tube 3, is emitted from the left window of high pressure helium neon tube 3
It reflects and returns on to left chamber mirror 1, form cycle.
Gas to be detected enters gas compartment 6 from the air inlet pipe 601 of 6 top of gas compartment, is discharged from following escape pipe 602,
Gas generates Raman signal with laser reactive；The laser emitting not reflected all by right chamber mirror 2 is to lens 7, the central part of lens 7
Position is added to black absorption film 701, and laser is absorbed by black absorbing film 701；Interference spectroscope 5 is located at the right side of lens 7, to gas
Raman signal in body room 6 is acquired, and is sent to computer system and is carried out analysis generation Raman spectrogram.Interference spectroscope 5 has
There are multichannel, high throughput, wave number accuracy high and the advantages such as stray light is low.Interference spectroscope 5, which is positioned over, deviates left chamber mirror 1, height
The position of 10 ° of axis where pressing He-Ne pipe 3,7 central point of prism 4, right chamber mirror 2 and lens, left chamber mirror 1, high pressure helium neon tube 3,
Axis, that is, laser optical path where 7 central point of prism 4, right chamber mirror 2 and lens, interference spectroscope 5, which is placed on, deviates 10 ° of light path
Position avoids the part exciting light not reflected from being directly entered interference spectroscope 5, is impacted to testing result.
Specific implementation process：The He-Ne Lasers that wavelength is 632.8nm is vibrated from high pressure helium neon tube 3 to be generated, and light path is by left
After hysteroscope 1 reflects, enter closed gas room 6 through high pressure helium neon tube 3；In gas compartment 6, light first reaches prism 4, then reaches
Right chamber mirror 2 is reflected by right chamber mirror 2, and original optical path is reflected back through prism 4, forms light path cycle.Multipath gas is by gas compartment 6
Air inlet pipe 601 enter gas compartment 6, generate Raman signal with laser reactive, there are angle between exciting light and Raman diffused light,
Lens 7 are not emitted to by the exciting light that right chamber mirror 2 all reflects, are absorbed by the black absorption film 701 in 7 centre of lens, are drawn
Graceful scattering light is collected by interference spectroscope 5, is sent to computer system analysis and is generated Raman spectrogram.
The present invention is to be based on forward scattering orientation detection, increases luminous flux, signal is made to be enhanced；It is defeated again first to open laser
Enter gas, test carries out in the closed state, can On-line sampling system multiple gases, be successfully realized comprising oxygen and
The mixed gas of nitrogen detects immediately online；The active resonant cavity structure of the present invention eliminates the loosely organized of passive cavity and lacks
It falls into, there is the features such as compact-sized, stability is good, and reliability is high, and detection result is excellent, have preferable operability, have Raman
The advantages of spectral technique and high-precision detect, and high sensitivity, it is adaptable, convenient for safeguarding.
Disclosed above is only the embodiment of the present invention, and still, the present invention is not limited to this, the technology of any this field
What personnel can think variation should all fall into protection scope of the present invention.
Claims (5)
1. a kind of laser gas Raman spectrum detection system based on forward scattering orientation detection, which is characterized in that including left chamber
Mirror（1）, right chamber mirror（2）, high pressure helium neon tube（3）, prism（4）, lens（7）, interference spectroscope（5）And gas compartment（6）, described
Left chamber mirror（1）With high pressure helium neon tube（3）It is placed in gas compartment（6）Left, prism（4）With right chamber mirror（2）It is placed in gas compartment（6）
In, interference spectroscope（5）And lens（7）It is placed in gas compartment（6）Right, left chamber mirror（1）, high pressure helium neon tube（3）, prism（4）、
Right chamber mirror（2）And lens（7）Be sequentially placed from left to right and central point on the same axis, interference spectroscope（5）It is placed in lens
（7）Right side；The high pressure helium neon tube（3）Both ends band Brewster window（301）, the gas compartment（6）Upside connect air inlet pipe
（601）, downside connect escape pipe（602）, the lens（7）Centre is provided with black absorption film（701）.
2. the laser gas Raman spectrum detection system according to claim 1 based on forward scattering orientation detection, special
Sign is, the black absorption film（701）For circle, radius 2mm.
3. the laser gas Raman spectrum detection system according to claim 1 or 2 based on forward scattering orientation detection,
It is characterized in that, the interference spectroscope（5）It is positioned over and deviates left chamber mirror（1）, high pressure helium neon tube（3）, prism（4）, right chamber mirror
（2）And lens（7）The position of 10 ° of axis where central point.
4. the laser gas Raman spectrum detection system according to claim 1 or 2 based on forward scattering orientation detection,
It is characterized in that, the prism（4）Center and gas compartment（6）The distance of left wall is 260mm, prism（4）With right chamber mirror（2）'s
Centre distance is 50mm.
5. the laser gas Raman spectrum detection system according to claim 1 or 2 based on forward scattering orientation detection,
It is characterized in that, the high pressure helium neon tube（3）Generation wavelength is the laser of 632.8nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810256186.5A CN108459005A (en) | 2018-03-27 | 2018-03-27 | A kind of laser gas Raman spectrum detection system based on forward scattering orientation detection |
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| CN201810256186.5A CN108459005A (en) | 2018-03-27 | 2018-03-27 | A kind of laser gas Raman spectrum detection system based on forward scattering orientation detection |
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| CN108459005A true CN108459005A (en) | 2018-08-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109557075A (en) * | 2019-01-21 | 2019-04-02 | 苏州朝光光电有限公司 | A kind of Raman enhancing structure based on exocoel resonance |
| CN109724645A (en) * | 2019-01-07 | 2019-05-07 | 江苏大学 | A kind of portable electric nose system of real-time monitoring gold ear fermentation process state |
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| CN203732449U (en) * | 2014-03-03 | 2014-07-23 | 上海理工大学 | Cavity enhanced laser Raman gas concentration detection device |
| CN104280338A (en) * | 2013-07-10 | 2015-01-14 | 福州高意通讯有限公司 | Raman enhanced measurement device and method and off-axis integral cavity structure applied to Raman enhanced measurement |
| CN105572099A (en) * | 2016-01-14 | 2016-05-11 | 上海理工大学 | Laser Raman gas detection device based on concentric endoscope |
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- 2018-03-27 CN CN201810256186.5A patent/CN108459005A/en active Pending
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| CN104280338A (en) * | 2013-07-10 | 2015-01-14 | 福州高意通讯有限公司 | Raman enhanced measurement device and method and off-axis integral cavity structure applied to Raman enhanced measurement |
| CN203732449U (en) * | 2014-03-03 | 2014-07-23 | 上海理工大学 | Cavity enhanced laser Raman gas concentration detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109724645A (en) * | 2019-01-07 | 2019-05-07 | 江苏大学 | A kind of portable electric nose system of real-time monitoring gold ear fermentation process state |
| CN109557075A (en) * | 2019-01-21 | 2019-04-02 | 苏州朝光光电有限公司 | A kind of Raman enhancing structure based on exocoel resonance |
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Application publication date: 20180828 |
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