CN106124452A - A kind of deep sea in-situ gas detector - Google Patents
A kind of deep sea in-situ gas detector Download PDFInfo
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- CN106124452A CN106124452A CN201610548073.3A CN201610548073A CN106124452A CN 106124452 A CN106124452 A CN 106124452A CN 201610548073 A CN201610548073 A CN 201610548073A CN 106124452 A CN106124452 A CN 106124452A
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
Abstract
The invention discloses a kind of described deep sea in-situ gas detector, including generating device of laser for exporting the laser beam of specified wavelength；Beam shaping and isolating device are used for making laser beam reach examination criteria requirement；Laser decline swing detection device use laser decline oscillation method detection deep sea in-situ gas composition；Moisture separation device is used for gathering deep sea water and isolating deep sea in-situ gas；Pressure control device adjusts the pressure within these three device for the demand according to these three device；Emission-control equipment is used for discharging laser and declines and swing detection device and complete remaining waste gas after detection；Data process and control device and decline and swing the work of detection device for controlling beam shaping and isolating device and laser, gather beam shaping and isolating device and decline with laser and swing the optical signal of detection device output and swing signal and according to optical signal and the composition swinging signal detection deep sea in-situ gas that declines with declining.
Description
Technical field
The present invention relates to gas detection technology field, especially, relate to a kind of deep sea in-situ gas detector.
Background technology
Ocean molten trapped air body is that one of object of study of marine geochemistry, ocean and air are continuous by ocean-atmosphere interface
Carry out dynamic gas exchange, and molten trapped air body distribution in ocean is usual with change and the biology of generation, physics, chemistry and ground in ocean
Matter process is relevant, and object relates to oxygen, ammonia, carbon dioxide, methane, nitrous oxide etc..Research water in molten trapped air body component,
Concentration and distribution characteristics, right solution hydrothermal solution mouth ecosystem, exploration exploitation of gas hydrate resource and development deep ocean work
Warm process, the marine environment solid detection etc. of technology, monitoring Global suffers from significance.
At present, to marine molten trapped air body, the most frequently used analysis means is collection in worksite sample, passes through gas on scientific investigation ship
The pre-treatment means such as body extraction process and vacuum outgas method obtain dissolved gas, then carry out offline inspection by gas chromatography method.
This method detectivity is high, technology relative maturity, but its operation complexity, process is the longest, during off-line measurement easily
Introduce other factors thus affect test result.
For prior art mesopelagic (200 meter Dao1000 meter Shui Shen) in situ gas sensing operation length complicated, time-consuming, the problem that is easily disturbed, the most still
There is not effective solution.
Summary of the invention
In view of this, it is an object of the invention to propose a kind of deep sea in-situ gas detector, it is not necessary to after gathering sample
Carry out off-line measurement, long-term deep sea in-situ can be implemented and detect in real time.
Based on above-mentioned purpose, the technical scheme that the present invention provides is as follows:
According to an aspect of the invention, it is provided a kind of deep sea in-situ gas detector.
Include according to the deep sea in-situ gas detector that the present invention provides:
Generating device of laser, generating device of laser is for exporting the laser beam of specified wavelength；
Beam shaping and isolating device, beam shaping and isolating device light path are connected to generating device of laser, are used for making to swash
Light beam reaches examination criteria requirement；
Laser declines and swings detection device, laser decline swing detection device light path be connected to beam shaping and isolating device, use sharp
The composition of light decay oscillation method detection deep sea in-situ gas；
Moisture separation device, moisture separation device is used for gathering deep sea water and isolating deep sea in-situ gas；
Pressure control device, pressure control device is connected to laser and declines and swing detection device and moisture separation device, is used for pressing
Demand according to these three device adjusts the pressure within these three device；
Emission-control equipment, emission-control equipment is connected to pressure control device, is used for discharging laser and declines and swing detection device
Complete remaining waste gas after detection；
Data process and control device, and data process and control device and are electrically connected to beam shaping and isolating device and swash
Light decay swings detection device, for control beam shaping and isolating device decline with laser swing detection device work, collection light beam whole
Shape and isolating device decline the optical signal swinging detection device output and swing signal with declining and swing signal inspection according to optical signal with declining with laser
Survey the composition of deep sea in-situ gas.
Wherein, emission-control equipment includes at least one of:
Pumping chamber, pumping chamber receives waste gas, is compressed waste gas and high-concentration waste gas is discharged into the external world；
Absorption chamber, includes the absorbing material of solid or liquid form in absorption chamber, absorption chamber receives waste gas, absorbing material with
Waste gas generation chemical reaction also absorbs waste gas, reduces the surplus of waste gas；
Locker room, locker room receives waste gas and is stored in emission-control equipment in high pressure mode.
Wherein, generating device of laser includes:
Semiconductor tunable laser group, the output of semiconductor tunable laser group can be with the laser beam of adjusting wavelength；
Laser drive unit, laser drive unit is used for driving semiconductor tunable laser Output of laser；
Temperature control unit, temperature control unit is for regulating the temperature of semiconductor tunable laser group working environment.
Wherein, beam shaping and isolating device include:
Beam shaping unit, beam shaping unit improves the diffraction efficiency of laser beam and the controllability of light spot profile；
Light beam isolated location, light beam isolated location filters the non-designated wavelength in laser beam；
Light splitting detector unit, whether the laser beam after the monitoring shaping of light splitting detector unit and isolation reaches examination criteria is wanted
Ask.
Wherein, laser decline swing detection device include:
Decline and swing Cavity unit, decline and in swinging Cavity unit, have deep sea in-situ gas to be detected and multiple declining to swing resonant reflec-tors,
Laser beam swings reflection between resonant reflec-tors multiple the declining swinging in Cavity unit of declining；
Monitoring and temperature conditioning unit, monitoring and temperature conditioning unit adjust and temperature and the pressure controlling deep sea in-situ gas to be detected
Power situation.
Wherein, moisture separation device includes:
Water pump, water pump is from collection deep-sea, external world water purification；
Steam separative element, steam separative element will extract the gas componant of dissolving in the deep-sea water purification of water pump collection；
Gas drying unit, the gas componant that gas drying unit extracts dissolving to steam separative element is dried place
Reason.
Wherein, data process and control device and include:
Optical signal detecting unit, optical signal detecting unit is electrically connected to beam shaping and isolating device, and detection light beam is whole
Shape and the optical signal of isolating device output；
Decline and swing signal gathering unit, decline and swing signal gathering unit and be electrically connected to laser and decline and swing detection device, detect laser
Decline and swing the deamplification of detection device output.
Light beam wavelength and the laser of above-mentioned beam shaping and isolating device output declines and swings the cavity length of detection device and meet
The battery of lens of longitudinal mode matching condition, beam shaping and isolating device decline with laser swing detection device couple meet transverse mode mate bar
Part.
Further, the detection composition of deep sea in-situ gas is at least one of: methane, carbon dioxide, oxygen；Ammonia, one
Nitrous oxide；Wherein, in deep sea in-situ gas, the detected limit concentration of methane is 5ppm.
From the above it can be seen that the technical scheme that the present invention provides is former by using moisture separation device to gather deep-sea
Position gas, use beam shaping and isolating device, laser decline swing detection device decline with laser swing method detected gas composition, use useless
The technological means of Flash Gas Compression Skid System aerofluxus, it is not necessary to carry out off-line measurement after gathering sample, it is possible to implement long-term deep sea in-situ
Detection in real time.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing used is needed to be briefly described, it should be apparent that, the accompanying drawing in describing below is only some enforcements of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtains according to these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 is the device block diagram of the deep sea in-situ gas detector according to the embodiment of the present invention；
Fig. 2 is the device detailed structure view of the deep sea in-situ gas detector according to the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with in the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is carried out further clear, complete, describe in detail, it is clear that described
Embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, this area
The every other embodiment that those of ordinary skill is obtained, broadly falls into the scope of protection of the invention.
According to embodiments of the invention, it is provided that a kind of deep sea in-situ gas detector.
Fig. 1 is illustrated that the structure drawing of device of deep sea in-situ gas detector, as it is shown in figure 1, according to embodiments of the present invention
The deep sea in-situ gas detector provided includes:
Generating device of laser 100, generating device of laser 100 is for exporting the laser beam of specified wavelength；
Beam shaping and isolating device 200, beam shaping and isolating device 200 light path are connected to generating device of laser 100,
For making laser beam reach examination criteria requirement；
Laser decline swing detection device 300, laser decline swing detection device 300 light path be connected to beam shaping and isolating device
200, use laser decline oscillation method detection deep sea in-situ gas composition；
Moisture separation device 400, moisture separation device 400 is used for gathering deep sea water and isolating deep sea in-situ gas；
Pressure control device 500, pressure control device 500 be connected to laser decline swing detection device 300 separate dress with steam
Put 400, adjust the pressure within these three device for the demand according to these three device；
Emission-control equipment 600, emission-control equipment 600 is connected to pressure control device 500, is used for discharging laser and declines and swing
Detection device 300 completes remaining waste gas after detection；
Data process and control device 700, and data process and control device 700 and are electrically connected to beam shaping and isolation dress
Put 200 to decline with laser and swing detection device 300, be used for controlling beam shaping and isolating device 200 and decline with laser and swing detection device 300
Work, gather beam shaping and isolating device 200 decline the optical signal swinging detection device 300 output with laser with decline swing signal,
And according to optical signal and the composition swinging signal detection deep sea in-situ gas that declines.
Wherein, emission-control equipment includes at least one of:
Pumping chamber, pumping chamber receives waste gas, is compressed waste gas and high-concentration waste gas is discharged into the external world；
Absorption chamber, includes the absorbing material of solid or liquid form in absorption chamber, absorption chamber receives waste gas, absorbing material with
Waste gas generation chemical reaction also absorbs waste gas, reduces the surplus of waste gas；
Locker room, locker room receives waste gas and is stored in emission-control equipment in high pressure mode.
As in figure 2 it is shown, generating device of laser 100 includes:
Semiconductor tunable laser group 110, semiconductor tunable laser group 110 output can be with the laser of adjusting wavelength
Bundle；
Laser drive unit 120, laser drive unit 120 is used for driving semiconductor tunable laser Output of laser；
Temperature control unit 130, temperature control unit 130 is used for regulating semiconductor tunable laser group 110 building ring
The temperature in border.
As in figure 2 it is shown, beam shaping and isolating device 200 include:
Beam shaping unit 210, beam shaping unit 210 improves the diffraction efficiency of laser beam and the scalable of light spot profile
Property；
Light beam isolated location 220, light beam isolated location 220 filters the non-designated wavelength in laser beam；
Light splitting detector unit 230, whether the laser beam after light splitting detector unit 230 is monitored shaping and isolated reaches detection mark
Alignment request.
As in figure 2 it is shown, laser decline swing detection device 300 include:
Decline and swing Cavity unit 310, decline and in swinging Cavity unit 310, have deep sea in-situ gas to be detected to decline that to swing chamber anti-with multiple
Penetrating mirror, laser beam swings reflection between resonant reflec-tors multiple the declining swinging in Cavity unit 310 of declining；
Monitoring and temperature conditioning unit 320, monitoring and temperature conditioning unit 320 adjust and the temperature controlling deep sea in-situ gas to be detected
Degree and pressure condition.
Laser is declined and swings detection technique and introduce in water in solubility Trace gas detection, it is proposed that the detection dress of mature and feasible
Put design.By analyzing the component of soluble gas, concentration and distribution characteristics in water, research marine carbon circulation is followed with heat
Ring, explore hydrothermal solution mouth distributing position, understand hydrothermal solution mouth ecosystem, explore and exploit submarine oil resources, analyze cold spring hydrocarbon ooze
Leakage etc. suffers from significance.
As in figure 2 it is shown, moisture separation device 400 includes:
Water pump 410, water pump 410 is from collection deep-sea, external world water purification；
Steam separative element 420, extracts dissolving in the deep-sea water purification that water pump 410 is gathered by steam separative element 420
Gas componant；
Gas drying unit 430, gas drying unit 430 extracts the gas componant of dissolving to steam separative element 420
It is dried process.
Include as in figure 2 it is shown, data process and control device 700:
Optical signal detecting unit 710, optical signal detecting unit 710 is electrically connected to beam shaping and isolating device 200, inspection
Survey beam shaping and the optical signal of isolating device 200 output；
Decline and swing signal gathering unit 720, decline swing signal gathering unit 720 be electrically connected to laser decline swing detection device 300,
Detection laser declines and swings the deamplification of detection device 300 output.
Light beam wavelength and the laser of above-mentioned beam shaping and isolating device 200 output declines, and to swing the cavity of detection device 300 long
Degree meets longitudinal mode matching condition, and the battery of lens of beam shaping and isolating device 200 declines with laser and swings detection device 300 and couple satisfied
Transverse mode matching condition.
Wavelength at output beam mates aspect with cavity, is calculated by optical design, both meetsLongitudinal mode
Joining condition, coupled lens group meets transverse mode matching condition again, it is achieved zlasing mode and the spatial match of chamber length, thus realizes higher
Detection is swung in declining of precision.
Further, the detection composition of deep sea in-situ gas is at least one of: methane, carbon dioxide, oxygen；Ammonia, one
Nitrous oxide；Wherein, in deep sea in-situ gas, the detected limit concentration of methane is 5ppm.
The detection of multiple gases is output as light source by the conjunction bundle of the semiconductor tunable laser group of multi-wavelength, and design is full
Foot multi-wavelength pattern and the cavity body structure of absorption line coupling, add temperature control system at containment portion simultaneously, ensure test
The accuracy of result and repeatability.
Laser ring-down spectroscopy detection method have highly sensitive, response is fast, accuracy is good, structure is relatively simple, it is many to be capable of
Plant the series of advantages such as synchronic gas detection, in seabed trace gas concentration context of detection, have additive method institute incomparable
Advantage.In contrast, in electrochemical sensor method, sensor selectivity is poor, measures and is easily disturbed, and device easily aoxidizes,
Resting state can be entered because of oxidation thus gas is no longer responded；Gas chromatography is except chromatographic column must be utilized to enter sample
Row separates, adds outside the complexity of structure, it is necessary to introduces other gases as carrier gas, increases measurement cost, and
This detector is shorter for service life.Use the photoionization detector of similar Cleaning Principle to there is also same problem with it.Draw
There is weak output signal, the shortcoming of fluorescence interference Raman spectrum in graceful spectrographic method, causes its certainty of measurement to be typically only mmol/L, it is difficult to
Meet the measurement demand of seabed trace gas concentration ppm or sub-ppm magnitude；In recent years the surface enhanced raman spectroscopy technology energy proposed
It is effectively improved, but repeatability is poor, it is difficult to observe for a long time.Infrared spectrometry is also the way using Laser Measurement strength retrogression
Realize the detection of gas concentration, but limited by gas absorbtivity, it is difficult to realize lower detection limit and more highly sensitive survey
Amount.The sensitive height of mass spectrography, can detect various ingredients, but instrument volume is big, power consumption is high and puts forward harshness to measuring environment
Requirement, need high vacuum environment, and expensive.Comparatively speaking, laser ring-down spectroscopy detection method has more high sexual valence
Ratio, is suitable for Trace gas detection under water.
The detection increase of laser ring-down spectroscopy effectively absorbs light path, thus improves inhaling with gas of accuracy of detection method generation
Receive the laser that matches of spectral line repeatedly to turn back in declining of being made up of optical reflection unit swings cavity reflection, thus it is smart to improve detection
Degree.According to Lambert-Beer's law,τ is ring-down time, and d is cavity length, and c is the light velocity, and R is that optics is anti-
Penetrating the reflectance of unit, α is absorptance.When intracavity is without absorbing gas, the duration of oscillation of cavity isFalse
If the reflectance of R is 99.99%, then absorption length is that the chamber of 104 times is long, compares traditional infrared absorption method, and laser declines and swings light
Spectrum detection method increases effective absorption length, so that detection sensitivity improves several orders of magnitude.With the solubility in ocean
As a example by gases methane, through the methane concentration of moisture separation device typically at about 50ppm, and laser ring-down spectroscopy detection method can
The detection limit methane blended gas less than 5ppm, meets the requirement of soluble gas detection.
It should be noted that deep-sea of the present invention is not limited to marine environment.For any waters, it is not limited to sea
Ocean, including rivers and lakes drilling well etc., as long as its depth of water is more than 100 meters, then its part more than 100 meters just meets of the present invention
Deep-sea cover field.
In sum, by means of the technique scheme of the present invention, by using moisture separation device to gather deep sea in-situ
Gas, uses beam shaping and isolating device, laser to decline and swings detection device and decline with laser and swing method detected gas composition, use waste gas
The technological means of processing means aerofluxus, it is not necessary to carry out off-line measurement after gathering sample, it is possible to implement long-term deep sea in-situ real
Time detection.
Those of ordinary skill in the field it is understood that the foregoing is only the specific embodiment of the present invention, and
Be not used in the restriction present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all
Within protection scope of the present invention should being included in.
Claims (9)
1. a deep sea in-situ gas detector, it is characterised in that including:
Generating device of laser, described generating device of laser is for exporting the laser beam of specified wavelength；
Beam shaping and isolating device, described beam shaping and isolating device light path are connected to described generating device of laser, are used for
Laser beam is made to reach examination criteria requirement；
Laser declines and swings detection device, described laser decline swing detection device light path be connected to described beam shaping and isolating device, make
With laser decline oscillation method detection deep sea in-situ gas composition；
Moisture separation device, described moisture separation device is used for gathering deep sea water and isolating deep sea in-situ gas；
Pressure control device, described pressure control device be connected to described laser decline swing detection device separate dress with described steam
Put, adjust the pressure within these three device for the demand according to these three device；
Emission-control equipment, described emission-control equipment is connected to described pressure control device, is used for processing described laser and declines and swing
Detection device completes remaining waste gas after detection；
Data process and control device, and described data process and control device and are electrically connected to described beam shaping and isolating device
Decline with described laser and swing detection device, decline swing detection device for controlling described beam shaping and isolating device and described laser
Work, gather described beam shaping and isolating device decline the optical signal swinging detection device output with described laser with decline swing signal,
And according to described optical signal and the composition swinging signal detection deep sea in-situ gas that declines.
A kind of deep sea in-situ gas detector the most according to claim 1, it is characterised in that described emission-control equipment bag
Include at least one of:
Pumping chamber, described pumping chamber receives waste gas, is compressed described waste gas and described high-concentration waste gas is discharged into the external world；
Absorption chamber, includes the absorbing material of solid or liquid form in described absorption chamber, described absorption chamber receives waste gas, described suction
Receive material and described waste gas generation chemical reaction and absorb described waste gas, reducing the surplus of described waste gas；
Locker room, described locker room receives waste gas and is stored in described emission-control equipment in high pressure mode.
A kind of deep sea in-situ gas detector the most according to claim 2, it is characterised in that described generating device of laser bag
Include:
Semiconductor tunable laser group, the output of described semiconductor tunable laser group can be with the laser beam of adjusting wavelength；
Laser drive unit, described laser drive unit is used for driving described semiconductor tunable laser Output of laser；
Temperature control unit, described temperature control unit is for regulating the temperature of described semiconductor tunable laser group working environment
Degree.
A kind of deep sea in-situ gas detector the most according to claim 2, it is characterised in that described beam shaping and isolation
Device includes:
Beam shaping unit, described beam shaping unit improves the diffraction efficiency of laser beam and the controllability of light spot profile；
Light beam isolated location, described light beam isolated location filters the non-designated wavelength in laser beam；
Light splitting detector unit, whether the laser beam after the monitoring shaping of described light splitting detector unit and isolation reaches examination criteria is wanted
Ask.
A kind of deep sea in-situ gas detector the most according to claim 2, it is characterised in that described laser declines and swings detection dress
Put and include:
Decline and swing Cavity unit, described in decline swing Cavity unit in have deep sea in-situ gas to be detected and multiple declining to swing resonant reflec-tors,
Laser beam swings reflection between resonant reflec-tors described multiple the declining swinging in Cavity unit of declining；
Monitoring and temperature conditioning unit, described monitoring and temperature conditioning unit adjust and temperature and the pressure controlling deep sea in-situ gas to be detected
Power situation.
A kind of deep sea in-situ gas detector the most according to claim 2, it is characterised in that described moisture separation device bag
Include:
Water pump, described water pump is from collection deep-sea, external world water purification；
Steam separative element, the gas extracting dissolving in the deep-sea water purification that described water pump is gathered by described steam separative element becomes
Point；
Gas drying unit, the gas componant that described gas drying unit extracts dissolving to described steam separative element is done
Dry process.
A kind of deep sea in-situ gas detector the most according to claim 2, it is characterised in that described data process and control
Device includes:
Optical signal detecting unit, described optical signal detecting unit is electrically connected to described beam shaping and isolating device, detects institute
State beam shaping and the optical signal of isolating device output；
Decline and swing signal gathering unit, described in decline and swing signal gathering unit and be electrically connected to described laser and decline and swing detection device, detection
Described laser declines and swings the deamplification of detection device output.
8. according to a kind of deep sea in-situ gas detector described in any one in claim 1-7, it is characterised in that described light
The light beam wavelength of bundle shaping and isolating device output declines with described laser to swing and detects the cavity length of device and meet longitudinal mode and mate bar
Part, the battery of lens of described beam shaping and isolating device declines with described laser and swings detection device and couple and meet transverse mode matching condition.
A kind of deep sea in-situ gas detector the most according to claim 8, it is characterised in that the detection of deep sea in-situ gas
Composition is at least one of: methane, carbon dioxide, oxygen；Ammonia, nitrous oxide；Wherein, methane in deep sea in-situ gas
Detected limit concentration be 5ppm.
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| CN107271364A (en) * | 2017-07-29 | 2017-10-20 | 中国地质调查局油气资源调查中心 | A kind of water air interface methane and carbon dioxide on-line monitoring system and method |
| CN107389604A (en) * | 2017-06-26 | 2017-11-24 | 中国科学院光电研究院 | A kind of laser, which declines, swings detection method |
| CN107884365A (en) * | 2017-12-14 | 2018-04-06 | 中国科学院深海科学与工程研究所 | A kind of deep-sea gas-detecting device based on partial pressure principle of mobile equilibrium |
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