CN108507974A - Extra large gas dissolved water laser spectrum on-line measuring device - Google Patents
Extra large gas dissolved water laser spectrum on-line measuring device Download PDFInfo
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- CN108507974A CN108507974A CN201810239928.3A CN201810239928A CN108507974A CN 108507974 A CN108507974 A CN 108507974A CN 201810239928 A CN201810239928 A CN 201810239928A CN 108507974 A CN108507974 A CN 108507974A
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- gas
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- measuring device
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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 extra large gas dissolved water laser spectrum on-line measuring devices.It includes that component and laser spectrum detection part connected to it is precipitated in seawater dissolved gas；Wherein, component is precipitated for continuously isolating the sample gas at detection original position in seawater on survey line in seawater dissolved gas, laser spectrum detection part is made of the sample spectra component and sample probe assembly connected, spectrum analysis room therein as sample spectra component is used to obtain the light path of the spectrum and indoor laser of sample gas, sample probe assembly is used to, according to the absorption signal intensity for measuring obtained sample gas, calculate CH in sample gas4、CO2、H2The concentration of S.The feature that it has fast response time, accuracy high, simple in structure simultaneously can be extremely easy to widely commercial applications and be explored in the continuous boat of walking online of ocean gas hydrate progress.
Description
Technical field
The present invention relates to a kind of laser spectrum on-line measuring device, especially a kind of extra large gas dissolved water laser spectrum exists
Line detector.
Background technology
Gas hydrates are a kind of potential clean energy resourcies, and mainly the light hydrocarbons such as methane gas and hydrone are in low temperature
The clathrate hydrate formed under condition of high voltage, the gas hydrates in ocean account for about the 90% of hydrate resource.In the recent period, people
In order to detect the gas hydrates in ocean, some good tries and effort are made, such as Chinese invention patent application CN
A kind of system for detecting methane concentration of seawater in situ that 102288719 A were announced on December 21st, 2011.The in-situ investigation system
System by seawater filter, pressure reducing valve, flow control valve, gas-liquid separation device, automatic sampling six-way valve, gaseous hydrocarbon detection device,
Analog-digital converter, sample water collector and chemisorption equipment are circumscribed with the pressure resistance in waste water cabin by piping connection and being assembled in
It is formed in cabin.When detection, the seawater in situ on survey line enters gas-liquid after seawater filter and pressure reducing valve, then through flow control valve
Separator, sample water after being deaerated and the gaseous sample gas separated；Sample water after degassing passes through sample hydromining
Storage realizes that acquisition, extra sample water are discharged into waste water cabin, and the gaseous sample gas separated is adopted by automatic sampling six-way valve
Enter gaseous hydrocarbon detection device after sample, extra sample gas is adsorbed through chemisorption equipment, the air-sensitive in gaseous hydrocarbon detection device
With the sensitive gas in gaseous sample redox reaction occurs for element, and the electric signal of generation is through corresponding chromatographic software capture card
After acquisition, digital electric signal is converted by analog-digital converter, and be sent into optical transmitter and receiver, through the PC machine on optical cable transmission to ship,
Carry out real-time display and the storage of data.Though this in-situ detecting system based on chromatographic technique can be used for the methane in seawater
Concentration carries out in-situ investigation, but also there is shortcomings, and first, the response time of system is slower, leads to the data phase measured
For point lag in situ, cause measured deviation larger；Secondly, system is excessively numerous and jumbled, particularly gaseous hydrocarbon detection device, not only cost
Height also makes the efficiency of detection be difficult to be promoted.
Invention content
The technical problem to be solved in the present invention is to overcome shortcoming in the prior art, provide a kind of fast response time,
Accuracy is high, extra large gas dissolved water laser spectrum on-line measuring device simple in structure.
To solve the technical problem of the present invention, used technical solution is that extra large gas dissolved water laser spectrum is online
Detection device includes that component is precipitated in seawater dissolved gas, especially：
The on-line measuring device also contains is precipitated the laser spectrum detection part that component is connect with seawater dissolved gas；
The seawater dissolved gas be precipitated component by the filter screen of serial communication, pressure reducing valve, flow valve, gas-liquid separator,
Dehumidifier, aeration ratio valve, spectrum analysis room, outlet proportioning valve, dehumidification tube, air pump, check valve, waste water storehouse, booster pump and useless
The mouth of a river and gas-liquid separation water outlet are connected to composition through water pump with waste water storehouse；
The laser spectrum detection part is made of the sample spectra component and sample probe assembly connected, wherein
Sample spectra component is spectrum analysis room, the output end connection of input terminal and fiber optic splitter, output end and the
One photodetector connects, the light path of spectrum and indoor laser for obtaining sample gas,
Sample probe assembly be saw-toothed wave generator and sine-wave generator output end through adder, laser controller,
Laser, optical fiber and fiber optic splitter are connect with the optical input port of spectrum analysis room, are located at spectrum analysis room optics output end
First photodetector at place is electrically connected through lock-in amplifier with data processor, another input terminal of lock-in amplifier therein
It is electrically connected with another output end of sine-wave generator through frequency multiplier, for strong according to the absorption signal for measuring obtained sample gas
Degree, by formula
P2f=k1·Sdcα0·2C、
Psin=k2·sdc,
P in formula2fFor the intensity of second harmonic signal --- the difference between peak value and baseline, PsinIt is non-absorbing to extract
Low frequency sine wave signal amplitude of the section load on sawtooth wave, SdcFor the DC component of laser intensity information, k1、k2For constant, α0
For the absorption coefficient of gas molecule, C is gas concentration, wherein
K in formula is constant, obtains CH in sample gas4、CO2、H2The concentration of S.
As being further improved for extra large gas dissolved water laser spectrum on-line measuring device：
Preferably, gas-liquid separator is the gas-liquid separator of built-in business modified polypropene hollow-fibre membrane.
Preferably, spectrum analysis room is that the off-axis optics of off-board pressure transducer, insulating layer and heater integrate chamber；It is conducive to
Make working condition of the off-axis optics integral chamber in stable constant temperature, constant pressure.
Preferably, output one of another output end of fiber optic splitter through the second photodetector and the first photodetector
It rises and is electrically connected with data processor by phase discriminator, be used for the effective light path of real-time online nominal light spectrum analysis chamber.
Preferably, it is equipped with optical fiber collimator between the optical input port and fiber optic splitter of spectrum analysis room.
Preferably, it is equipped with plus lens between spectrum analysis room and the first photodetector.
Preferably, laser is DFB (distributed Feedback) lasers or QCL (quanta cascade) laser.
Preferably, data processor is microcomputer or microprocessor.
Advantageous effect compared with the existing technology is：
After such structure, the present apparatus is both since the sample gas being arranged in component dehumidifying is precipitated in seawater dissolved gas
Device, inlet, outlet proportioning valve, dehumidification tube, air pump and check valve, and enable seawater dissolved gas that component is precipitated in continuous on survey line
Constantly isolate sample gas dry in seawater at detection original position；Again because component and laser spectrum inspection is precipitated in seawater dissolved gas
The presence for surveying the shared spectrum analysis room based on spectrum analysis mechanism of component, to obtain spectral information and the analysis room of sample gas
The light path of interior laser is laid a good foundation；Due also to sample probe assembly can be strong according to the absorption signal for measuring obtained sample gas
Degree, with high accuracy calculates CH in sample gas4、CO2、H2The concentration of S；To make the present apparatus and meanwhile be provided with fast response time,
Accuracy is high, feature simple in structure, so make its be extremely easy to widely commercial applications in ocean gas hydrate into
Row is continuous to walk boat exploration online.
Description of the drawings
Fig. 1 is a kind of basic structure schematic diagram that component is precipitated in seawater dissolved gas in the present invention.
Fig. 2 is a kind of basic structure schematic diagram of laser spectrum detection part in the present invention.
Specific implementation mode
The preferred embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1 and Fig. 2, the composition of extra large gas dissolved water laser spectrum on-line measuring device is as follows：
Seawater dissolved gas is precipitated component and laser spectrum detection part and is connected through shared spectrum analysis room 9；Wherein：
Seawater dissolved gas be precipitated component by the filter screen 2 of serial communication, pressure reducing valve 3, flow valve 4, gas-liquid separator 5,
Dehumidifier 7, aeration ratio valve 8, spectrum analysis room 9, outlet proportioning valve 13, dehumidification tube 14, air pump 15, check valve 16, waste water storehouse
18, booster pump 19 and waste water mouth 20 and gas-liquid separation water outlet 6 are connected to composition through water pump 17 with waste water storehouse 18；Wherein, gas-liquid
Separator 5 is the gas-liquid separator of built-in business modified polypropene hollow-fibre membrane, and spectrum analysis room 9 is off-board pressure transducer
10, the constant pressure of insulating layer 11 and heater 12, the off-axis optics of constant temperature integrate chamber.
Laser spectrum detection part is made of the sample spectra component and sample probe assembly connected；It is therein,
Sample spectra component is spectrum analysis room 9, input terminal connect with the output end of fiber optic splitter 27, output end and
First photodetector 31 connects.
Sample probe assembly is the output end of saw-toothed wave generator 21 and sine-wave generator 22 through adder 23, laser control
Device 24, laser 25, optical fiber 26, fiber optic splitter 27 and optical fiber collimator 28 processed and the optical input port of spectrum analysis room 9 connect
It connects, is located at the first photodetector 31 of 9 optics output of spectrum analysis room through lock-in amplifier 34 and data processor 35
Electrical connection, another input terminal of lock-in amplifier 34 therein is through another output end of frequency multiplier 29 and sine-wave generator 22 electricity
Connection；The splitting ratio of fiber optic splitter 27 above-mentioned is 10%：90%, therein 10% connects the second photodetector all the way
32, it 90% connects optical fiber collimator 28 all the way, plus lens 30 is equipped between spectrum analysis room 9 and the first photodetector 31, swash
Light device 25 is Distributed Feedback Laser (or QCL lasers), and data processor 35 is microcomputer (or microprocessor).
Output one of another output end of fiber optic splitter 27 through the second photodetector 32 and the first photodetector 31
It rises and is electrically connected with data processor 35 by phase discriminator 33.
Data processor 35 is connect with host computer 36.
When detection, the seawater 1 located in situ is detected after the elimination of filter screen 2 wherein big particulate matter and pollutant, by subtracting
Pressure valve 3 and flow valve 4 become the sample water of low pressure constant flow.Sample water deaerates through gas-liquid separator 5, and waste water therein is by gas-liquid
Separation water outlet 6 drains into waste water storehouse 18 through water pump 17；The humidity of the gas of precipitation is saturated vapour pressure, is removed through dehumidifier 7
After steam therein, obtain dry sample gas, avoid condensation vapor in the high reflectance hysteroscope in spectrum analysis room 9 and
Cause the reduction of lens reflecting rate.Sample gas under the regulation and control of aeration ratio valve 8, pressure sensor 10 and outlet proportioning valve 13,
With dry isothermal, equipressure, etc. the air-flows of streams flow through spectrum analysis room 9, for obtaining spectrum and the spectrum analysis of sample gas
The light path of indoor laser is used.The exhaust gas for flowing out outlet proportioning valve 13 is useless in being discharged into through dehumidification tube 14, air pump 15 and check valve 16
While sump 18, also the steam removed in dehumidifier 7 is taken out of together to waste water storehouse 18.Waste water in waste water storehouse 18 and exhaust gas
Sea is drained by waste water mouth 20 through booster pump 19.
The sine wave signal that the sawtooth signal and sine-wave generator 22 that saw-toothed wave generator 21 generates generate is through addition
After device 23 is superimposed, obtained adjustment signal injection laser controller 24, to the modulation to 25 output beam of laser.With tune
The light beam that the laser 25 of signal processed exports sends the second photodetector 32 through optical fiber 26 and fiber optic splitter 27 and optical fiber is accurate
Straight device 28.The output of second photodetector 32 and the first photodetector 31 is sent together to phase discriminator 33 and carries out phase demodulation comparison
Afterwards, then it is sent to data processor 35, is used for the effective light path of real-time online nominal light spectrum analysis chamber 9.It send to optical fiber collimator 28
Light beam coupling to spectrum analysis room 9 in, it is more in by the spectrum analysis room 9 that constitutes of the off-axis optics of constant pressure, constant temperature integral chamber
After secondary reflection the first photodetector 31 is focused on through plus lens 30.The output of first photodetector 31 occurs with sine wave
Output of the another way sine wave signal that device 22 conveys after 29 frequency multiplication of frequency multiplier is sent to lock-in amplifier 34 and is demodulated together.
Signal after demodulation is sent to data processor 35, by it according to the absorption signal intensity of obtained sample gas, by formula
P2f=k1·Sdcα0·2C、
Psin=k2·Sdc,
P in formula2fFor the intensity of second harmonic signal --- the difference between peak value and baseline, PsinIt is non-absorbing to extract
Low frequency sine wave signal amplitude of the section load on sawtooth wave, SdcFor the DC component of laser intensity information, k1、k2For constant, α0
For the absorption coefficient of gas molecule, C is gas concentration, wherein
K in formula is constant, obtains CH in sample gas4、CO2、H2The concentration of S.Later, concentration value is sent to host computer 36.
Obviously, those skilled in the art can be to the extra large gas dissolved water laser spectrum on-line measuring device of the present invention
Carry out various modification and variations without departing from the spirit and scope of the present invention.If in this way, these modifications and change to the present invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to exist comprising these modification and variations type
It is interior.
Claims (8)
1. component, feature is precipitated in a kind of sea gas dissolved water laser spectrum on-line measuring device, including seawater dissolved gas
It is：
The on-line measuring device also contains is precipitated the laser spectrum detection part that component is connect with seawater dissolved gas；
Component is precipitated by the filter screen (2) of serial communication, pressure reducing valve (3), flow valve (4), gas-liquid point in the seawater dissolved gas
From device (5), dehumidifier (7), aeration ratio valve (8), spectrum analysis room (9), outlet proportioning valve (13), dehumidification tube (14), air pump
(15), check valve (16), waste water storehouse (18), booster pump (19) and waste water mouth (20) and gas-liquid separation water outlet (6) are through water pump
(17) it is connected to composition with waste water storehouse (18)；
The laser spectrum detection part is made of the sample spectra component and sample probe assembly connected, wherein
Sample spectra component is spectrum analysis room (9), input terminal connect with the output end of fiber optic splitter (27), output end and
First photodetector (31) connects, the light path of spectrum and indoor laser for obtaining sample gas,
Sample probe assembly is the output end of saw-toothed wave generator (21) and sine-wave generator (22) through adder (23), laser
Controller (24), laser (25), optical fiber (26) and fiber optic splitter (27) and the optical input port of spectrum analysis room (9) connect
It connects, is located at first photodetector (31) of spectrum analysis room (9) optics output through at lock-in amplifier (34) and data
It manages device (35) to be electrically connected, another input terminal of lock-in amplifier (34) therein is through frequency multiplier (29) and sine-wave generator (22)
The electrical connection of another output end, for according to the obtained absorption signal intensity of sample gas is measured, by formula
P2f=k1·Sdcα0·2C、
PsiN=k2·Sdc,
P in formula2fFor the intensity of second harmonic signal --- the difference between peak value and baseline, PsinAdd for non-absorbing section for extraction
The low frequency sine wave signal amplitude being loaded on sawtooth wave, SdcFor the DC component of laser intensity information, k1、k2For constant, α0For gas
The absorption coefficient of body molecule, C are gas concentration, wherein
K in formula is constant, obtains CH in sample gas4、CO2、H2The concentration of S.
2. sea gas dissolved water laser spectrum on-line measuring device according to claim 1, it is characterized in that gas-liquid separation
Device (5) is the gas-liquid separator of built-in business modified polypropene hollow-fibre membrane.
3. sea gas dissolved water laser spectrum on-line measuring device according to claim 1, it is characterized in that spectrum analysis
Room (9) is that the off-axis optics of off-board pressure transducer (10), insulating layer (11) and heater (12) integrate chamber.
4. sea gas dissolved water laser spectrum on-line measuring device according to claim 1, it is characterized in that fiber beam splitting
Output of another output end of device (27) through the second photodetector (32) and the first photodetector (31) passes through phase demodulation together
Device (33) is electrically connected with data processor (35), is used for the effective light path of real-time online nominal light spectrum analysis chamber (9).
5. sea gas dissolved water laser spectrum on-line measuring device according to claim 1, it is characterized in that spectrum analysis
It is equipped with optical fiber collimator (28) between the optical input port and fiber optic splitter (27) of room (9).
6. sea gas dissolved water laser spectrum on-line measuring device according to claim 1, it is characterized in that spectrum analysis
Plus lens (30) is equipped between room (9) and the first photodetector (31).
7. sea gas dissolved water laser spectrum on-line measuring device according to claim 1, it is characterized in that laser
(25) it is Distributed Feedback Laser or QCL lasers.
8. sea gas dissolved water laser spectrum on-line measuring device according to claim 1, it is characterized in that data processing
Device (35) is microcomputer or microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810239928.3A CN108507974A (en) | 2018-03-22 | 2018-03-22 | Extra large gas dissolved water laser spectrum on-line measuring device |
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| CN201810239928.3A CN108507974A (en) | 2018-03-22 | 2018-03-22 | Extra large gas dissolved water laser spectrum on-line measuring device |
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| CN108507974A true CN108507974A (en) | 2018-09-07 |
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| CN201810239928.3A Pending CN108507974A (en) | 2018-03-22 | 2018-03-22 | Extra large gas dissolved water laser spectrum on-line measuring device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211825A (en) * | 2018-10-10 | 2019-01-15 | 吉林大学 | Solution gas infrared detecting device and method in a kind of water using acoustooptical effect collimated light path |
| CN109406451A (en) * | 2018-11-19 | 2019-03-01 | 山东省科学院海洋仪器仪表研究所 | A kind of cold spring gas componant and concentration detection apparatus and detection method |
| CN110530815A (en) * | 2019-09-23 | 2019-12-03 | 中国石油大学(华东) | Dissolve CO in seabed based on photonic crystal fiber2Gas detection method and system |
| CN114839318A (en) * | 2022-03-01 | 2022-08-02 | 中国海洋大学 | High-efficient degasification detecting system suitable for high pressure sea water underwater operation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211825A (en) * | 2018-10-10 | 2019-01-15 | 吉林大学 | Solution gas infrared detecting device and method in a kind of water using acoustooptical effect collimated light path |
| CN109406451A (en) * | 2018-11-19 | 2019-03-01 | 山东省科学院海洋仪器仪表研究所 | A kind of cold spring gas componant and concentration detection apparatus and detection method |
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| CN114839318A (en) * | 2022-03-01 | 2022-08-02 | 中国海洋大学 | High-efficient degasification detecting system suitable for high pressure sea water underwater operation |
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