CN104697952B - Device for the multiple gases in seawater to be carried out with Concentration Testing - Google Patents
Device for the multiple gases in seawater to be carried out with Concentration Testing Download PDFInfo
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- CN104697952B CN104697952B CN201510126662.8A CN201510126662A CN104697952B CN 104697952 B CN104697952 B CN 104697952B CN 201510126662 A CN201510126662 A CN 201510126662A CN 104697952 B CN104697952 B CN 104697952B
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Abstract
The invention discloses a kind of device for being used to carry out the multiple gases in seawater Concentration Testing, after seawater pressure is reduced to normal pressure by seawater by water inlet through pressure-reducing valve, sample water tank is entered, and keep circulation to exchange with extraneous seawater by outlet valve and draining pump；During sampling, seawater in sample water tank is pumped into gas-liquid separation chamber by flow pump carries out gas-liquid separation, the gas isolated enters sensing chamber, gas in infrared radiation sensing chamber is launched by infrared light supply, the infrared ray transmitted through the gas is received by pyroelectric infrared sensor, and is converted into electric signal output to the concentration calculating for controlling circuit to carry out under test gas；After end to be detected, booster air pump aspirates the gas in sensing chamber and is emitted into sample water tank, and passes through circulation exchange discharge pressure-resistant cabin.The detection means volume of the present invention is small, easy to carry, can carry out Concentration Testing to the multiple gases dissolved in seawater, with simple to operate, precision height, the advantages of sampling efficiency is high.
Description
Technical field
The invention belongs to seawater detecting system technical field, specifically, it is related to a kind of be used for being dissolved in seawater
Methane, carbon dioxide, acetylene etc. carry out the detection device of concentration on-line checking to the gas of infrared photaesthesia.
Background technology
Produced carbon dioxide will lack more than the carbon dioxide produced by non-combusted fuels and coal during due to combustion of natural gas
Much, therefore, gas hydrates are considered as a kind of potential high efficient energy sources resource in recent years.The methane gas dissolved in seawater
Body not only has important influence to global warming and marine environment change, and is also to find that leakage type gas hydrates are assigned
One of the foundation in area is deposited, is to obtain seawater methane to lead to the technology that the methane content dissolved in seawater is monitored on-line therefore
Measure the Main Means of change procedure.
The on-line water flushing technology of methane gas content is the new real-time observation method developed in recent years, base in ocean
The detecting devices produced in the technology, its construction is varied, and cost variance is larger, and it is low that measurement accuracy has height to have, and can only
To methane, a kind of this gas carries out Concentration Testing, therefore suitable application area is very limited, it is impossible to meet marine exploration field pair now
The a variety of gas with various of dissolving in the seawater carry out the job requirement of on-line checking.
The content of the invention
It is an object of the invention to provide a kind of dress for being used to carry out the multiple gases of dissolving in the seawater Concentration Testing
Put, it is simple in construction, with low cost, Concentration Testing can be carried out to the multiple gases dissolved in seawater.
In order to solve the above technical problems, the present invention is achieved using following technical scheme：
A kind of device for being used to carry out the multiple gases in seawater Concentration Testing, including pressure-resistant cabin and be arranged on described
Pressure-reducing valve, sample water tank, flow pump, gas-liquid separation chamber, sensing chamber, air pump, draining pump and outlet valve in pressure-resistant cabin；Described
Water inlet and delivery port are provided with the bulkhead of pressure-resistant cabin, the delivery port is connected by outlet valve and draining pump with sample water tank
It is logical；After seawater pressure is reduced to normal pressure by seawater by water inlet through pressure-reducing valve, the seawater entered in sample water tank, sample water tank
Circulation is kept to exchange with the extraneous seawater of pressure-resistant cabin under the collective effect of pressure-reducing valve and draining pump；When carrying out seawater sampling,
Seawater in sample water tank is pumped into gas-liquid separation chamber by flow pump and carries out gas-liquid separation, the gas isolated is entered
Sensing chamber；Infrared light supply and pyroelectric infrared sensor, infrared light supply transmitting infrared radiation are provided with the sensing chamber
Gas in sensing chamber, the infrared ray transmitted through the gas is received by pyroelectric infrared sensor, and is converted into telecommunications
Number output to control circuit carry out under test gas concentration calculate；After end to be detected, the gas in booster air pump suction sensing chamber
Body is simultaneously emitted into described sample water tank, and opens the isolating valve being connected between gas-liquid separation chamber and sample water tank, suction
Seawater in gas-liquid separation chamber is exchanged the gas and liquid after detection to described sample water tank, and then by the circulation of seawater
Displace sample water tank.
Design, be provided with the gas-liquid separation chamber ventilative impermeable as a kind of preferred structure of the gas-liquid separation chamber
The barrier film of water, by the barrier film by gas-liquid separation chamber be divided into above and below two chambers, top is air chamber, and lower section is liquid room；It is described
Sample water tank is connected by inlet pipeline and outlet pipeline with described liquid room respectively, and the flow pump is arranged on described water inlet
In pipeline, the isolating valve is arranged in described outlet pipeline；After the isolating valve is opened, the suction of the draining pump is utilized
Seawater in liquid room is pumped into sample water tank by effect.
It is preferred that, the barrier film can have permeable watertight characteristic using silicone resin film or poly tetrafluoroethylene etc.
Film design is formed.
Further, it is additionally provided with the inlet pipeline limit that seawater flows from sample water tank to flow pump unidirectional
Valve, the check valve is located between sample water tank and flow pump.
It is preferred that, the air pump is connected to the bottom of sample water tank by gas piping, so can be by air pump from inspection
Survey the gas pumped out in room to be adequately dissolve in the seawater in sample water tank, consequently facilitating draining pump is in discharge sample water tank
In seawater when the gas can together be given off pressure-resistant cabin；It is provided with the gas piping that air pump connects sample water tank
Scavenging air valve.In order to improve the accuracy of gas detection, it is ensured that follow-up gas detection process can be smoothed out, the gas is controlled
Gas in pumping sensing chamber is until sensing chamber is evacuated.
Further, the seawater entered by the water inlet is filtered out after impurity therein via filter, is passed through
Described pressure-reducing valve.By the pipeline for setting filter that the impurity in seawater can be avoided to block inside pressure-resistant cabin, to ensure inspection
Surveying work can be smoothed out.
As a kind of preferred structure design method of the sensing chamber, divide on the relative two side wall of the sensing chamber
A transparent windows are not offered, and the remainder of sensing chamber is made up of light-proof material；The infrared light supply is just to wherein
One transparent windows is laid, and it is indoor that transmitting infrared light is injected into detection by the transparent windows；The rpyroelectric infrared
Sensor is just laid to another transparent windows, receives the infrared light transmitted.
In order to reduce interference, measurement accuracy is improved, it is red that the pyroelectric infrared sensor is preferred to use binary channels pyroelectricity
Outer sensor, including Measurement channel and reference channel, the infrared wavelength that gas to be checked absorbs is determined according to the species of gas to be checked,
And then select the optical filter of corresponding wavelength to be therewith arranged in the Measurement channel of pyroelectric infrared sensor, to receive the wavelength
Optical signal.
As it is described control circuit a kind of preferred electrical architecture design, it is described control circuit in be provided with amplifier,
Analog-digital converter, processor and pwm circuit, the amplified circuit of electric signal exported by the pyroelectric infrared sensor are carried out
After enhanced processing, output to analog-digital converter is converted into data signal, and sends to processor the densimeter for carrying out under test gas
Calculate；The processor exports the pwm signal of certain modulating frequency to pwm circuit, and the switch of infrared light supply is controlled by pwm circuit
Frequency.
It is preferred that, modulating frequency value in the range of 0.1Hz-3Hz；The under test gas is to infrared photaesthesia
Gas, such as carbon dioxide CO2, carbon monoxide CO, methane CH4, ethene C2H4, acetylene C2H2, propane C3H8, butane C4H10Deng.
Compared with prior art, advantages and positive effects of the present invention are：The gas-detecting device of the present invention have it is in situ,
In real time, the features such as being easy to multiple space and time scales quantitative observation, small volume, easy to operate, accuracy of detection are high, can be placed on what is specified with cloth
Observation position is continuously monitored, and the realization continuous, sight in real time under water that can become one with other chemistry, physical sensors
Survey, for the abnormal of gas concentration, the gas hydrates preservation region that discovery is new, depths such as methane, ethene, propane in detection seawater
The seepage for entering to recognize sea bed gas hydrate provides new sight to Global climate change and global carbon Effect study
Survey means, before being had a wide range of applications during marine environment change and global climate change study and seabed resources are developed
Scape.
It is read in conjunction with the figure after the detailed description of embodiment of the present invention, the other features and advantages of the invention will become more
Plus it is clear.
Brief description of the drawings
Fig. 1 is the overall architecture for being used to carry out the multiple gases in seawater in the device of Concentration Testing proposed by the invention
Block diagram；
Fig. 2 is a kind of schematic block circuit diagram for the embodiment for controlling circuit.
Embodiment
The embodiment to the present invention is described in detail below in conjunction with the accompanying drawings.
Embodiment one, shown in Figure 1, being used for of the present embodiment carries out Concentration Testing to the multiple gases that are dissolved in seawater
Device it is main by pressure-resistant cabin 1, pressure-reducing valve 2, sample water tank 3, flow pump 5, gas-liquid separation chamber 6, sensing chamber 9, air pump 11, draining
The parts such as pump 14, outlet valve 15 and control circuit are constituted.Wherein, the other components that pressure-resistant cabin 1 is used in protection device, with
Ensure that device can adapt to higher Underwater Pressure.Water inlet 101 and delivery port 102 are offered on the bulkhead of pressure-resistant cabin 1, is filled
Other building blocks put are arranged in pressure-resistant cabin 1.The water inlet 101 is connected to pressure-reducing valve 2 by inlet pipeline, and
Sample water tank 3 is connected to by pressure-reducing valve 2, the top or the top position of the side wall of sample water tank 3 of sample water tank 3 is preferably connected to
Put place.In order to avoid the impurity in seawater enters detection means, pipe blocking is caused, influence detects being smoothed out for work, this
Embodiment preferably sets up a filter 16 in the inlet pipeline that water inlet 101 connects pressure-reducing valve 2, and such as mesh area is in 10 μ
m2The screen pack of left and right, with the impurity in effective filtering sea.The sample water tank 3 is connected by pipeline with gas-liquid separation chamber 6
It is logical, the barrier film 7 with ventilative but impervious nature is provided with the gas-liquid separation chamber 6, such as by silicones or poly- four
The film that the materials such as PVF PTFE are made, by the barrier film 7 by gas-liquid separation chamber 6 be separated into above and below two chambers, top
Chamber is air chamber 601, and lower chamber is liquid room 602, and the sample water tank 3 passes through inlet pipeline and the liquid room of gas-liquid separation chamber 6
602 connections.Check valve 4 and flow pump can be further set in inlet pipeline of the sample water tank 3 with liquid room 602 is connected
5, by a certain amount of seawater to be measured in the aspirated specimens water tank 3 of flow pump 5 and it is pumped into the liquid room 602 of gas-liquid separation chamber 6, leads to
Crossing check valve 4 ensures seawater from sample water tank 3 to the one-way flow of gas-liquid separation chamber 6.In gas-liquid separation chamber 6, seawater is dissolved in
In gas air inlet chamber 601 is entered by barrier film 7.The air chamber 601 is connected by gas piping with sensing chamber 9, makes air chamber 601
In gas can diffuse into sensing chamber 9.Infrared light supply 8 and pyroelectric infrared sensor are provided with the sensing chamber 9
10, launch the gas in infrared radiation sensing chamber 9 using infrared light supply 8, and wear by the reception of pyroelectric infrared sensor 10
Cross the infrared ray that the gas is transmitted.The pyroelectric infrared sensor 10 is generated therewith according to the light intensity received
Corresponding electric signal, output to control circuit, the concentration under test gas is calculated.
In the present embodiment, the sensing chamber 9 is preferably provided to strip, as shown in figure 1, relative in the position of sensing chamber 9
Two short brinks offer a transparent windows respectively, be preferably designed to glass window, the other parts of sensing chamber 9 are equal
It is made of light-proof material, to avoid infrared light from leaking outside, influences accuracy of detection.By the infrared light supply 8 just to wherein one
Individual transparent windows are laid, and its infrared light launched is incided by transparent windows in sensing chamber 9, irradiating and detecting room
Under test gas in 9.Pyroelectric infrared sensor 10 is just laid to another transparent windows, received through under test gas
The light transmitted.
Pyroelectric infrared sensor is a kind of electrooptical device, the surface charge pole of its internal PZT crystal structure
Change changes with its temperature change.After sensor is by infrared radiation, internal temperature rise causes polarized state to drop therewith
Low, surface charge concentration is also accordingly reduced, and this is equivalent to " discharge " a part of electric charge, takes the electric charge of release from outside
Go out, reform into the output voltage of sensor.If infra-red radiation is lasting constant, surface charge will be raised to new poised state,
At this moment electric charge is just no longer discharged, also just there is no signal output.The light source being only continually changing could be produced on a sensor
The output signal of consecutive variations, signal frequency is identical with the frequency that infra-red radiation changes.Therefore, the present embodiment design control electricity
Road, the described infrared light supply 8 of connection, is modulated by certain frequency to infrared light supply 8.With reference to shown in Fig. 2, in the control electricity
Processor can be set in road（Such as MCU）And pwm circuit, the pwm signal of certain frequency is exported extremely by processor MCU
Pwm circuit.The pwm circuit can be designed to the form of on-off circuit, in the current supply circuit for being connected to infrared light supply 8, according to
The current supply circuit conducting of the pwm signal control infrared light supply 8 received is cut off, and then controls infrared light supply 8 according to setting
Modulating frequency open and close, by providing the infra-red radiation that is continually changing, to ensure that pyroelectric infrared sensor 10 can
All the time effective electric signal is exported.
In the present embodiment, the modulating frequency of the infrared light supply 8 can specifically determine that the present embodiment is excellent according to experiment
It is selected in value in the interval of [0.1Hz-3Hz].
In order that the gas concentration detection apparatus of the present embodiment can be applied to a variety of under test gas, the under test gas is
The gas sensitive to infrared light, such as carbon dioxide CO2, carbon monoxide CO, methane CH4, ethene C2H4, acetylene C2H2, propane
C3H8, butane C4H10Realized Deng, the present embodiment by the way of the optical filter set on pyroelectric infrared sensor 10 is changed.Tool
For body, each gas to infrared photaesthesia all has the characteristic for absorbing specific wavelength infrared light, such as methane gas pair
Wavelength has specific absorption peak for 3.31 μm of infrared light.According to the infrared wavelength absorption characteristic of under test gas, corresponding ripple is selected
Long optical filter is arranged on pyroelectric infrared sensor 10, according to the radiation intensity of the IR wavelengths received, with reference to
The infrared luminous intensity that infrared light supply 8 is launched, you can calculate absorption intensity of the under test gas to the specific wavelength infrared light, then
According to Lang Bo-Bill（Lambert-Beer）Absorption law just can calculate the concentration of under test gas.
Lang Bo-Bill's absorption law：；Wherein,It is that light passes through the projection light intensity after Absorption of Medium；To enter
Penetrate medium light intensity；It is the function of wavelength for absorption coefficient；It is under test gas concentration；Optical path length, i.e., light is to be measured
The active path length passed through in gas.
In order to improve accuracy of detection, the present embodiment is preferred to use the reception of Dual-channel pyroelectric infrared sensor 10 and transmits inspection
Survey the infrared light of room 9.The Dual-channel pyroelectric infrared sensor 10 has two paths：All the way be Measurement channel, all the way for
Reference channel.Optical filter is provided with two paths, by taking methane gas as an example, wavelength can be installed in Measurement channel is
3.31 μm of optical filter, installs the optical filter that wavelength is 4.0 μm in reference channel.By sensing chamber 9 transmit it is infrared
Light is divided into two beams, respectively directive Measurement channel and reference channel.The factors such as the unstable and photoelectric device drift due to light source
Simultaneously have influence on Measurement channel and reference channel, by the way that measurement signal and reference signal are compared, just can filter out these because
The interference of element, obtains accurate gas concentration.Specific formula for calculation is as follows：
Measurement signal：
Reference signal：；
In formula,、It is the disturbing factor of light path；、It is the coupling parameter of optical system.Two-way
Signal is compared, and is obtained：
。
By simplifying formula, obtain：
；Wherein, K is coefficient.
, only need to be apneusis according to the infrared waves of under test gas when carrying out Concentration Testing to dissolving gas with various in the seawater
The optical filter that characteristic changes respective wavelength is received, in the Measurement channel of pyroelectric infrared sensor 10.
Because the electric signal exported by pyroelectric infrared sensor 10 is fainter, in order to improve the reliable of signal reception
Property, the present embodiment control circuit in be additionally provided with amplifier and A/D converter, as shown in Figure 2.Sensed by rpyroelectric infrared
The electric signal that device 10 is exported is first transmitted to front-end amplifier and carries out preposition enhanced processing, and the electric signal after amplification is changed through A/D
Device is sampled and carried out after analog-to-digital conversion, output digit signals to described processor MCU.Processor MCU is according to the number received
The projection light intensity that word signal of change goes out after infrared light is absorbed by under test gas, then with reference to the known incident light of infrared light supply 8
By force, the concentration of under test gas is calculated exactly using above-mentioned calculation formula.
Telecommunication circuit and storage circuit can also be further set in the control circuit, described processing is connected respectively
Device MCU.The under test gas concentration calculated for processor MCU, on the one hand can transmit to storage circuit, locally be protected
Deposit；On the other hand the monitoring ship or bank station on sea can be uploaded to by telecommunication circuit, for the prison on marine or bank
Survey personnel observe.
It is of course also possible to which the work for calculating gas concentration is turned to be completed by monitoring device waterborne or bank station, i.e. processor
MCU by the data signal received by telecommunication circuit using it is wired or be wirelessly uploaded to monitoring device waterborne or
Bank station, the concentration that under test gas in seawater is completed by the computer in monitoring device waterborne or bank station is calculated.
In order that the gas concentration detection apparatus of the present embodiment can continuously work under water, the present embodiment is in pressure-resistant cabin 1
In be additionally provided with to having surveyed the path that gas and seawater are discharged, as shown in Figure 1.The sample water tank 3 is passed through into draining pump
14 connect delivery port 102 with outlet valve 15.Sensing chamber 9 is connected into air pump 11 by gas circuit, the air pump 11 passes through scavenging air valve 12
Connected with sample water tank 3, the bottom of sample water tank 3 is preferably connected to by gas piping, so that the gas detected can fill
Divide and be dissolved in the seawater in sample water tank 3, and then together emitted with seawater.Bottom in the liquid room 602 of gas-liquid separation chamber 6
Portion connects outlet pipeline, and the outlet pipeline connects sample water tank 3 by isolating valve 13, and the isolating valve 13 is preferred to use unidirectionally
Valve, is opened, and then under the swabbing action of draining pump 14, the seawater in liquid room 602 is pumped into sample water after detection terminates
Cabin 3.
Before being detected, the seawater in sample water tank 3 passes through pressure-reducing valve 2 and the sea extraneous with pressure-resistant cabin 1 of draining pump 14
Water keeps circulation to exchange.When carrying out seawater sample sampling, the seawater in sample water tank 3 is pumped into gas-liquid point by flow pump 5
From carrying out gas-liquid separation in room 6.After end to be detected, isolating valve 13, air pump 11 and scavenging air valve 12 are opened, respectively by liquid room 602
In waste liquid and the waste gas in sensing chamber 9 be drained into sample water tank 3, then in the circulation of sample water tank 3 and extraneous seawater
In exchange process, waste gas and waste liquid are set a raft going to the external world from sample water tank 3.
With reference to Fig. 1, so that under test gas is methane as an example, to the specific work of the gas concentration detection apparatus of the present embodiment
It is described in detail as principle.
The gas concentration detection apparatus that the present embodiment is proposed is arranged on research vessel or underwater robot, with investigation
Ship or underwater robot carry out seabed operation.When research vessel or underwater robot dive are to the marine site for needing to detect, open
Dynamic gas concentration detection apparatus brings into operation.Before measurements, air pump 11 is first turned on, sensing chamber 9 is entered by air pump 11
Row vacuumize process；Air pump 11 is then shut off, control pressure-reducing valve 2 is opened, and seawater is entered pressure-resistant cabin 1 by water inlet 101
In, and after filtering out impurity therein through filter 16, into pressure-reducing valve 2 to be reduced to normal pressure（Such as one atmospheric pressure）, then
Enter in sample water tank 3.While pressure-reducing valve 2 are opened or after having a certain amount of seawater in sample water tank 3, open
Outlet valve 15 and draining pump 14, make the seawater in sample water tank 3 real by water inlet and delivery port and the extraneous seawater of pressure-resistant cabin 1
Now circulation is exchanged.
When needing to carry out gas concentration detection to seawater sample, check valve 4, and turn-on flow rate pump 6 are opened, passes through flow
Pump 6 carries out quantitative sampling to the seawater in sample water tank 3, and is pumped into the liquid room 602 of gas-liquid separation chamber 6.In gas-liquid separation
In room 6, the gas molecule such as methane, oxygen, the carbon dioxide of dissolving in the seawater is diffused into air chamber 601 by barrier film 7, and sample
Product water can not then pass through barrier film 7.Because sensing chamber 9 now has been evacuated, therefore the gas in air chamber 601 can spread rapidly
Enter in sensing chamber 9.Because the concentration of methane gas in sensing chamber 9 and methane gas in the outer briny environment of pressure-resistant cabin 1 are dense
Degree is directly related, therefore just can obtain the methane gas content in marine site to be measured by calculating the concentration of methane gas in sensing chamber 9.
After the methane gas in air chamber 601 enters sensing chamber 9, by the processor MCU output PWM letters in control circuit
Number, control infrared light supply 8 to launch infrared light with specific modulating frequency by pwm circuit, and be injected into sensing chamber 9.When containing
When the infrared light for having methane gas characteristic absorption wavelength band is entered in sensing chamber 9, methane gas will absorb this part wavelength
Infrared light so that the light intensity of infra-red radiation changes.Infrared light through methane gas is connect by pyroelectric infrared sensor 10
After receipts, output reflects the electric signal of the IR wavelengths intensity size, and preposition enhanced processing is carried out and by A/D through front-end amplifier
After converter sampling, it is converted into data signal and exports to processor MCU, calculate the methane content in seawater.
It is of course also possible to which the work for calculating methane gas content is turned to be completed by monitoring device waterborne or bank station, i.e. place
Reason device MCU is by the data signal received by telecommunication circuit using wired or be wirelessly uploaded to monitoring device waterborne
Or bank station, the calculating of the methane content in seawater is completed by the computer in monitoring device waterborne or bank station.
After detection is finished, air pump 11 and unidirectional scavenging air valve 12 are opened, the gas in sensing chamber 9 is drained into sample water tank 3
In, until sensing chamber 9 is evacuated.Then, isolating valve 13 is opened, makes liquid room 602 and the sample water tank 3 of gas-liquid separation chamber 6
Seawater in liquid room 602, is pumped into sample water tank 3, with sample water tank 3 by connection using the swabbing action of draining pump 14
Seawater together go out by cyclic permutation.
The gas concentration detection apparatus small volume of the present embodiment, it is easy to carry, underwater robot can be mounted in and enter deep
Sea, carries out the multiple gases concentration that dissolves in seawater sampling and detection sample water, can also be reconnoitred at deep-sea petroleum resources when
Time is used, and this device has the advantages that simple to operate, precision is high, sampling efficiency is high.
Certainly, described above is only a kind of preferred embodiment of the invention, it is noted that for the art
Those of ordinary skill for, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these change
Enter and retouch and also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of device for being used to carry out the multiple gases in seawater Concentration Testing, it is characterised in that：Including pressure-resistant cabin and
The pressure-reducing valve that is arranged in the pressure-resistant cabin, sample water tank, flow pump, gas-liquid separation chamber, sensing chamber, air pump, draining pump and go out
Water valve；Be provided with water inlet and delivery port on the bulkhead of the pressure-resistant cabin, the delivery port by outlet valve and draining pump with
Sample water tank is connected；After seawater pressure is reduced to normal pressure by seawater by water inlet through pressure-reducing valve, sample water tank, sample water are entered
Seawater in cabin keeps circulation to exchange under the collective effect of pressure-reducing valve and draining pump with the extraneous seawater of pressure-resistant cabin；Carrying out sea
During water sampling, the seawater in sample water tank is pumped into gas-liquid separation chamber by flow pump and carries out gas-liquid separation, is isolated
Gas enters sensing chamber；Infrared light supply and pyroelectric infrared sensor, infrared light supply transmitting are provided with the sensing chamber
Gas in infrared radiation sensing chamber, the infrared ray transmitted through the gas is received by pyroelectric infrared sensor, and
Electric signal output to the concentration for controlling circuit to carry out under test gas is converted into calculate；After end to be detected, booster air pump suction inspection
Survey the gas in room and be emitted into described sample water tank, and open be connected between gas-liquid separation chamber and sample water tank every
From valve, the seawater in suction gas-liquid separation chamber is exchanged after detection to described sample water tank, and then by the circulation of seawater
Gas and liquid displacement go out sample water tank.
2. the device according to claim 1 for being used to carry out the multiple gases in seawater Concentration Testing, it is characterised in that：
The barrier film of permeable watertight is provided with the gas-liquid separation chamber, by the barrier film by gas-liquid separation chamber be divided into above and below two
Chamber, top is air chamber, and lower section is liquid room；The sample water tank passes through inlet pipeline and outlet pipeline and described liquid room respectively
Connection, the flow pump is arranged in described inlet pipeline, and the isolating valve is arranged in described outlet pipeline；It is described every
After being opened from valve, the seawater in liquid room is pumped into sample water tank using the swabbing action of the draining pump.
3. the device according to claim 2 for being used to carry out the multiple gases in seawater Concentration Testing, it is characterised in that：
The barrier film is silicone resin film or poly tetrafluoroethylene.
4. the device according to claim 2 for being used to carry out the multiple gases in seawater Concentration Testing, it is characterised in that：
It is additionally provided with the inlet pipeline and limits the check valve that seawater flows from sample water tank to flow pump, the check valve is located at
Between sample water tank and flow pump.
5. the device according to claim 1 for being used to carry out the multiple gases in seawater Concentration Testing, it is characterised in that：
The air pump is connected to the bottom of sample water tank by gas piping, and scavenging air valve is provided with the gas piping；The gas
Gas in pumping sensing chamber is until sensing chamber is evacuated.
6. the device according to claim 1 for being used to carry out the multiple gases in seawater Concentration Testing, it is characterised in that：
The seawater entered by the water inlet is filtered out after impurity therein via filter, passes through described pressure-reducing valve.
7. the device according to any one of claim 1 to 6 for being used to carry out the multiple gases in seawater Concentration Testing,
It is characterized in that：Offer a transparent windows respectively on the relative two side wall of the sensing chamber, sensing chamber its
Remaining part point is made up of light-proof material；The infrared light supply is just laid to one of transparent windows, and transmitting infrared light passes through
It is indoor that the transparent windows are injected into detection；The pyroelectric infrared sensor is just laid to another transparent windows,
Receive the infrared light transmitted.
8. the device according to claim 7 for being used to carry out the multiple gases in seawater Concentration Testing, it is characterised in that：
The pyroelectric infrared sensor is Dual-channel pyroelectric infrared sensor, including Measurement channel and reference channel, according to be checked
The species of gas determines the infrared wavelength that gas to be checked absorbs, and then selects the optical filter of corresponding wavelength to be therewith arranged on pyroelectricity
In the Measurement channel of infrared sensor, to receive the optical signal of the wavelength.
9. the device according to any one of claim 1 to 6 for being used to carry out the multiple gases in seawater Concentration Testing,
It is characterized in that：Amplifier, analog-digital converter, processor and pwm circuit are provided with the control circuit, passes through the heat
The amplified circuit of electric signal for releasing electric infrared sensor output is amplified after processing, and output to analog-digital converter is converted into numeral
Signal, and the concentration calculating for carrying out under test gas is sent to processor；The processor exports the pwm signal of certain modulating frequency
To pwm circuit, the switching frequency of infrared light supply is controlled by pwm circuit.
10. the device according to claim 9 for being used to carry out the multiple gases in seawater Concentration Testing, its feature exists
In：Modulating frequency value in the range of 0.1Hz-3Hz；The under test gas is the gas to infrared photaesthesia.
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| CN105169754B (en) * | 2015-09-17 | 2017-03-22 | 山东省科学院海洋仪器仪表研究所 | seawater gas detection device and detection method |
| CN105203491B (en) * | 2015-10-10 | 2018-08-31 | 山东省科学院海洋仪器仪表研究所 | A kind of deep-sea methane concentration situ detection system |
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| CN102288574A (en) * | 2011-07-08 | 2011-12-21 | 华南理工大学 | Device and method for quantitatively analyzing concentration of multi-component oil fume |
| CN102288719B (en) * | 2011-07-14 | 2013-09-25 | 中国地质大学（北京） | System for detecting methane concentration of seawater in situ |
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