CN204462001U - A kind of device detecting multiple gases concentration in seawater - Google Patents

A kind of device detecting multiple gases concentration in seawater Download PDF

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Publication number
CN204462001U
CN204462001U CN201520162985.8U CN201520162985U CN204462001U CN 204462001 U CN204462001 U CN 204462001U CN 201520162985 U CN201520162985 U CN 201520162985U CN 204462001 U CN204462001 U CN 204462001U
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China
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gas
seawater
water tank
sample water
chamber
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CN201520162985.8U
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Chinese (zh)
Inventor
吕成兴
高乾
牟华
周忠海
刘波
李磊
惠超
郝宗睿
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Oceanographic Instrumentation Research Institute Shandong Academy of Sciences
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Oceanographic Instrumentation Research Institute Shandong Academy of Sciences
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Abstract

The utility model discloses a kind of device detecting multiple gases concentration in seawater, comprise pressure-resistant cabin, sample water tank, gas-liquid separation chamber, sensing chamber etc.; Seawater enters into sample water tank by water inlet after seawater pressure is reduced to normal pressure by reduction valve, and keeps circulating by outlet valve and unwatering pump and extraneous seawater and exchange; During sampling, seawater in sample water tank is pumped in gas-liquid separation chamber by flow pump and carries out gas-liquid separation, isolated gas enters into sensing chamber, launched the gas in infrared radiation sensing chamber by infrared light supply, the infrared ray transmitted through described gas is received by pyroelectric infrared sensor and is converted to electric signal and exports control circuit to.Gas concentration detection apparatus volume of the present utility model is little, easy to carry, can carry out sample detecting to the multiple gases of dissolving in seawater, has simple to operate, flexible, sampling efficiency advantages of higher.

Description

A kind of device detecting multiple gases concentration in seawater
Technical field
The utility model belongs to seawater detection system technical field, specifically, relates to a kind of sniffer for carrying out concentration on-line checkingi to infrared light activated gas to the methane dissolved in seawater, carbon dioxide, acetylene etc.
Background technology
The carbon dioxide produced more than non-combusted fuels and coal due to the carbon dioxide produced during combustion of natural gas wants much less, and therefore, gas hydrate are considered to a kind of potential high efficient energy sources resource in recent years.The methane gas dissolved in seawater not only has important impact to global warming and marine environment change, and be one of foundation finding leakage type gas hydrate Fu Cun district, therefore, the technology of carrying out on-line monitoring to the methane content dissolved in seawater is the Main Means obtaining seawater methane flux change procedure.
In ocean, the on-line water flushing technology of methane gas content is the new real-time observation method of of development in recent years, based on the detecting devices that this technology produces, its structure is varied, cost variance is larger, it is low that measuring accuracy has height to have, and can only carry out Concentration Testing to this kind of gas of methane, therefore suitable application area is very limited, hydrospace detection field now can not be met and the multiple gas with various dissolved in the seawater is carried out to the job requirement of on-line checkingi.
Summary of the invention
The purpose of this utility model is to provide a kind of gas concentration detection apparatus, and provide a kind of hardware supported for realizing the on-line checkingi of specific gas concentration in seawater, structure is simple, with low cost, volume is little, sampling efficiency is high.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
Detect a device for multiple gases concentration in seawater, comprise pressure-resistant cabin and be arranged on reduction valve in described pressure-resistant cabin, sample water tank, flow pump, gas-liquid separation chamber, sensing chamber, air pump, unwatering pump and outlet valve; The bulkhead of described pressure-resistant cabin is provided with water inlet and water delivering orifice, and described water delivering orifice is communicated with sample water tank with unwatering pump by outlet valve; Seawater after seawater pressure is reduced to normal pressure by reduction valve, enters into sample water tank by water inlet, and the seawater in sample water tank keeps circulating with the seawater in the pressure-resistant cabin external world and exchanges under the acting in conjunction of reduction valve and unwatering pump; When carrying out seawater sampling, the seawater in sample water tank is pumped in gas-liquid separation chamber by flow pump and carries out gas-liquid separation, and isolated gas enters into sensing chamber; Described sensing chamber is provided with infrared light supply and pyroelectric infrared sensor, infrared light supply launches the gas in infrared radiation sensing chamber, the infrared ray transmitted through described gas is received by pyroelectric infrared sensor, and converts electric signal to and export control circuit to; Described air pump aspirates the gas in sensing chamber and is disposed in sample water tank after detection terminates.
As a kind of preferred structure design of described gas-liquid separation chamber, in described gas-liquid separation chamber, be provided with the barrier film of permeable watertight, by described barrier film, gas-liquid separation chamber is divided into upper and lower two chambers, top is air chamber, and below is liquid chamber; Described sample water tank is communicated with described liquid chamber with outlet pipeline respectively by inlet pipeline, and described flow pump is arranged in described inlet pipeline, in described outlet pipeline, be provided with isolation valve.Described isolation valve is opened after gas concentration detection terminates, and utilizes the swabbing action of described unwatering pump to be pumped in sample water tank by the seawater in liquid chamber, and then cycling replaces sample water tank.
Preferably, the film design that described barrier film can adopt silicone resin film or poly tetrafluoroethylene etc. to have permeable watertight characteristic forms.
Further, in described inlet pipeline, be also provided with the retaining valve limiting seawater and flow from sample water tank to flow pump, described retaining valve is between sample water tank and flow pump.
Preferably, described air pump is connected to the bottom of sample water tank by gas piping, the gas that air pump can be pumped out from sensing chamber is like this dissolved in the seawater in sample water tank fully, thus is convenient to unwatering pump and described gas together can be given off pressure-resistant cabin when discharging the seawater in sample water tank; Connect at air pump in the gas piping of sample water tank and be provided with scavenging air valve.In order to improve the accuracy of gas detect, ensure that follow-up gas detect process can be carried out smoothly, control described air pump suction sensing chamber in gas until sensing chamber is evacuated.
Further, described water inlet connects reduction valve by inlet pipeline, in described inlet pipeline, be provided with filtrator, the impurity in seawater can be avoided to block the pipeline of pressure-resistant cabin inside, to ensure that testing can be carried out smoothly by arranging filtrator.
As a kind of preferred structure design of described sensing chamber, two relative sidewalls of described sensing chamber offer a transparent windows respectively, and the remainder of sensing chamber is made up of light-proof material; Described infrared light supply is just laid one of them transparent windows, launches infrared light and is injected in sensing chamber by described transparent windows; Described pyroelectric infrared sensor is just laid another one transparent windows, receives the infrared light transmitted.
In order to reduce interference, improve measuring accuracy, described pyroelectric infrared sensor preferably adopts Dual-channel pyroelectric infrared sensor, comprise Measurement channel and reference channel, the infrared wavelength of gas absorption to be checked is determined according to the kind of gas to be checked, and then select the optical filter of corresponding wavelength to be with it arranged in the Measurement channel of pyroelectric infrared sensor, to receive the light signal of described wavelength.
As a kind of preferred electrical architecture design of described control circuit, amplifier, analog to digital converter, processor and pwm circuit is provided with in described control circuit, the electric signal exported by described pyroelectric infrared sensor carries out after amplification process through amplifying circuit, export analog to digital converter to and convert digital signal to, and be sent to processor; Described processor exports the pwm signal of certain modulating frequency to pwm circuit, is controlled the switching frequency of infrared light supply by pwm circuit.
Further, described processor connects memory circuit and telecommunication circuit, carries out data interaction by telecommunication circuit and monitoring equipment waterborne or bank station.
Compared with prior art, advantage of the present utility model and good effect are: gas concentration detection apparatus volume of the present utility model is little, easy to carry, underwater robot can be mounted in and enter deep-sea, carry out seawater sampling, then for realizing Concentration Testing to the multiple gases of dissolving in Seawater Samples water, also can use when hydrocarbon resources is reconnoitred at deep-sea, this device has simple to operate, flexible, sampling efficiency advantages of higher.
After reading the detailed description of the utility model embodiment by reference to the accompanying drawings, other features of the present utility model and advantage will become clearly.
Accompanying drawing explanation
Fig. 1 is the overall architecture block diagram of the device of multiple gases concentration in the detection seawater that proposes of the utility model;
Fig. 2 is the schematic block circuit diagram of a kind of embodiment of control circuit.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
Embodiment one, shown in Figure 1, forming primarily of parts such as pressure-resistant cabin 1, reduction valve 2, sample water tank 3, flow pump 5, gas-liquid separation chamber 6, sensing chamber 9, air pump 11, unwatering pump 14, outlet valve 15 and control circuits for the device multiple gases of dissolving in seawater being carried out to Concentration Testing of the present embodiment.Wherein, pressure-resistant cabin 1 for the protection of other ingredients in device, to guarantee that device can adapt to higher Underwater Pressure.The bulkhead of pressure-resistant cabin 1 offers water inlet 101 and water delivering orifice 102, and other building blocks of device are all arranged in pressure-resistant cabin 1.Described water inlet 101 is connected to reduction valve 2 by inlet pipeline, and is connected to sample water tank 3 by reduction valve 2, be preferably connected to the top of sample water tank 3 or the top position of sample water tank 3 sidewall.In order to avoid the impurity in seawater enters pick-up unit, cause pipe blocking, affect carrying out smoothly of testing, the present embodiment connects in the inlet pipeline of reduction valve 2 at water inlet 101 preferably sets up a filtrator 16, and such as mesh area is at 10 μm 2the screen pack of left and right, with the impurity in effective filtering sea.Described sample water tank 3 is communicated with gas-liquid separation chamber 6 by pipeline, be provided with to have in described gas-liquid separation chamber 6 and breathe freely but the barrier film 7 of impervious nature, the film be such as made up of the material such as silicones or polytetrafluoroethylene PTFE, by described barrier film 7, gas-liquid separation chamber 6 is separated into upper and lower two chambers, upper chambers is air chamber 601, lower chamber is liquid chamber 602, and described sample water tank 3 is communicated with the liquid chamber 602 of gas-liquid separation chamber 6 by inlet pipeline.In the inlet pipeline connecting described sample water tank 3 and liquid chamber 602, retaining valve 4 and flow pump 5 can be set further, be pumped in the liquid chamber 602 of gas-liquid separation chamber 6 by a certain amount of seawater to be measured in flow pump 5 aspirated specimens water tank 3, ensure that seawater is from sample water tank 3 to gas-liquid separation chamber 6 uniflux by retaining valve 4.In gas-liquid separation chamber 6, the gas dissolved in the seawater enters air chamber 601 by barrier film 7.Described air chamber 601 is communicated with sensing chamber 9 by gas piping, enables the gas in air chamber 601 diffuse into sensing chamber 9.Described sensing chamber 9 is provided with infrared light supply 8 and pyroelectric infrared sensor 10, utilizes infrared light supply 8 to launch gas in infrared radiation sensing chamber 9, and received the infrared ray transmitted through described gas by pyroelectric infrared sensor 10.Described pyroelectric infrared sensor 10 generates electric signal corresponding with it according to the light intensity received, and export control circuit to, the concentration for gas to be measured calculates.
In the present embodiment, described sensing chamber 9 is preferably arranged to strip, as shown in Figure 1, two short brinks relative in sensing chamber 9 position offer a transparent windows respectively, be preferably designed to glass window, other parts of sensing chamber 9 all adopt light-proof material to make, and to avoid Infrared to leak outside, affect accuracy of detection.Just laid one of them transparent windows by described infrared light supply 8, the infrared light enabling it launch incides in sensing chamber 9 by transparent windows, the gas to be measured in irradiating and detecting room 9.Pyroelectric infrared sensor 10 is just laid another one transparent windows, receives the light transmitted through gas to be measured.
Pyroelectric infrared sensor is a kind of electrooptical device, and the surface charge polarization of the PZT crystal structure of its inside changes with its temperature variation.After sensor is subject to infrared radiation, internal temperature raises and causes polarized state to decrease, and surface charge concentration is corresponding reduction also, this has just been equivalent to " release " a part of electric charge, will the electric charge taking-up of release from outside, just becomes the output voltage of sensor.If infrared radiation continues constant, surface charge will be raised to new equilibrium state, at this moment just no longer discharges electric charge, also just no longer includes signal and output.Only have the light source of constantly change could produce continually varying output signal on a sensor, signal frequency is identical with the frequency that infrared radiation changes.Therefore, the present embodiment design con-trol circuit, the infrared light supply 8 described in connection, modulates infrared light supply 8 by certain frequency.Shown in composition graphs 2, can placement processor (such as MCU etc.) and pwm circuit in described control circuit, export the pwm signal of certain frequency to pwm circuit by processor MCU.Described pwm circuit can be designed to the form of on-off circuit, be connected in the current supply circuit of infrared light supply 8, current supply circuit conducting or the cut-out of infrared light supply 8 is controlled according to the pwm signal received, and then control the modulating frequency opening and closing of infrared light supply 8 according to setting, by providing the infrared radiation of constantly change, to guarantee that pyroelectric infrared sensor 10 can export effective electric signal all the time.
In the present embodiment, the modulating frequency of described infrared light supply 8 can experimentally be come specifically to determine, the present embodiment is value in the interval of [0.1Hz-3Hz] preferably.
In order to enable the gas concentration detection apparatus of the present embodiment be applicable to multiple gas to be measured, described gas to be measured is the gas to Infrared sensitivity, such as carbon dioxide CO 2, carbon monoxide CO, methane CH 4, ethene C 2h 4, acetylene C 2h 2, propane C 3h 8, butane C 4h 10deng, the present embodiment adopts the mode changing the optical filter that pyroelectric infrared sensor 10 is arranged to realize.Specifically, each all has the characteristic absorbing specific wavelength infrared light to infrared light activated gas, such as methane gas has specific absorption peak to the infrared light that wavelength is 3.31 μm.According to the infrared wavelength absorption characteristic of gas to be measured, the optical filter of respective wavelength is selected to be arranged on pyroelectric infrared sensor 10, according to the radiation intensity of this IR wavelengths received, in conjunction with the infrared light intensity that infrared light supply 8 is launched, the absorption intensity of gas to be measured to this specific wavelength infrared light can be calculated, then just can calculate the concentration of gas to be measured according to Lang Bo-Bill (Lambert-Beer) absorption law.Because the method utilizing Lang Bo-Bill's absorption law to calculate gas concentration has been current known technology, therefore the present embodiment is not described in detail concrete computation process at this.
In order to improve accuracy of detection, the present embodiment preferably adopts Dual-channel pyroelectric infrared sensor 10 to receive the infrared light transmiting sensing chamber 9.Described Dual-channel pyroelectric infrared sensor 10 has two paths: a road is Measurement channel, and a road is reference channel.In two paths, be provided with optical filter, for methane gas, the optical filter that wavelength is 3.31 μm can be installed in Measurement channel, the optical filter that wavelength is 4.0 μm is installed in reference channel.The infrared light transmitted by sensing chamber 9 is divided into two bundles, respectively directive Measurement channel and reference channel.Because the factor such as instability and photoelectric device drift of light source has influence on Measurement channel and reference channel simultaneously, by measuring-signal and reference signal being compared, just can leach the interference of these factors, obtaining gas concentration accurately.
When carrying out Concentration Testing to the gas with various dissolved in the seawater, only need change the optical filter of respective wavelength according to the infrared wavelength absorption characteristic of gas to be measured, being arranged 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 reliability of Signal reception, the present embodiment is also provided with amplifier and A/D converter in control circuit, as shown in Figure 2.First the electric signal exported by pyroelectric infrared sensor 10 is transferred to front-end amplifier and carries out enlarge leadingly process, and the electric signal after amplification is after A/D converter is sampled and carried out analog to digital conversion, and output digit signals is to described processor MCU.Processor MCU, according to the digital signal received, utilizes above-mentioned known gas concentration calculating method can calculate the concentration of gas to be measured.
In described control circuit, can also telecommunication circuit and memory circuit be set further, connect described processor MCU respectively.For the gas concentration to be measured that processor MCU calculates, can memory circuit be transferred on the one hand, carry out this locality and preserve; On the other hand can be uploaded to monitoring ship on sea or bank station, for monitoring personnel observation that is marine or bank by telecommunication circuit.
Certainly, also the work calculating gas concentration can be turned and be completed by monitoring equipment waterborne or bank station, namely, the digital signal received adopts wired or wireless mode to be uploaded to monitoring equipment waterborne or bank station by telecommunication circuit by processor MCU, and the concentration being completed gas to be measured in seawater by the computing machine in monitoring equipment waterborne or bank station calculates.
In order to enable the gas concentration detection apparatus continuous working under water of the present embodiment, the present embodiment is also provided with the path to surveying gas and seawater and discharging in pressure-resistant cabin 1, as shown in Figure 1.Described sample water tank 3 is communicated with water delivering orifice 102 by unwatering pump 14 with outlet valve 15.Sensing chamber 9 is communicated with air pump 11 by gas circuit, described air pump 11 is communicated with sample water tank 3 by scavenging air valve 12, be connected to the bottom of sample water tank 3 preferably by gas piping, be fully dissolved in the seawater in sample water tank 3 with the gas enabling detection complete, and then together emit with seawater.Outlet pipeline is connected in the bottom of the liquid chamber 602 of gas-liquid separation chamber 6, described outlet pipeline is communicated with sample water tank 3 by isolation valve 13, described isolation valve 13 preferably adopts retaining valve, open after detection terminates, and then under the swabbing action of unwatering pump 14, the seawater in liquid chamber 602 is pumped to sample water tank 3.
Before detecting, the seawater in sample water tank 3 keeps circulating with the seawater in pressure-resistant cabin 1 external world by reduction valve 2 and unwatering pump 14 and exchanges.When carrying out seawater sample sampling, the seawater in sample water tank 3 is pumped in gas-liquid separation chamber 6 by flow pump 5 and carries out gas-liquid separation.After end to be detected, open isolation valve 13, air pump 11 and scavenging air valve 12, respectively the waste gas in the waste liquid in liquid chamber 602 and sensing chamber 9 is drained in sample water tank 3, then in the sample water tank 3 circulation exchange process with extraneous seawater, waste gas and waste liquid is set a raft going to the external world from sample water tank 3.
Below in conjunction with Fig. 1, for gas to be measured for methane, the specific works principle of the gas concentration detection apparatus of the present embodiment is described in detail.
The gas concentration detection apparatus proposed by the present embodiment is arranged on research ship or underwater robot, carries out seabed operation with research ship or underwater robot.When the marine site that research ship or underwater robot dive detect to needs, start gas concentration detection apparatus and bring into operation.Before measurements, first open air pump 11, by air pump, 11 pairs of sensing chamber 9 vacuumize process; Then air pump 11 is closed, control reduction valve 2 to open, make seawater enter into pressure-resistant cabin 1 by water inlet 101, and after the impurity that filter 16 filters out wherein, enter reduction valve 2 to reduce to normal pressure (such as an atmospheric pressure), then enter into sample water tank 3.While unlatching reduction valve 2 or after having a certain amount of seawater in sample water tank 3, open outlet valve 15 and unwatering pump 14, make the seawater in sample water tank 3 realize circulating by the seawater in water inlet and water delivering orifice and pressure-resistant cabin 1 external world and exchange.
When needs carry out gas concentration detection to seawater sample, open retaining valve 4, and turn-on flow rate pump 6, carry out quantitative collection by the seawater in flow pump 6 pairs of sample water tanks 3, and be pumped in the liquid chamber 602 of gas-liquid separation chamber 6.In gas-liquid separation chamber 6, the gas molecule such as methane, oxygen, carbon dioxide dissolved in the seawater is diffused in air chamber 601 by barrier film 7, and sample water then can not through barrier film 7.Because sensing chamber 9 is now evacuated, the gas therefore in air chamber 601 can diffuse into rapidly in sensing chamber 9.Because the concentration of methane gas in sensing chamber 9 is directly related with the concentration of methane gas in the outer briny environment of pressure-resistant cabin 1, the methane gas content in marine site to be measured therefore just can be obtained by the concentration of methane gas calculated in sensing chamber 9.
Enter into after sensing chamber 9 until the methane gas in air chamber 601, by the processor MCU output pwm signal in control circuit, control infrared light supply 8 by pwm circuit and launch infrared light with specific modulating frequency, and be injected in sensing chamber 9.When the infrared light containing methane gas characteristic absorption wavelength band enters into sensing chamber 9, methane gas, by absorbing the infrared light of this part wavelength, makes the light intensity of infrared radiation change.After being received by pyroelectric infrared sensor 10 through the infrared light of methane gas, export the electric signal of this IR wavelengths intensity size of reflection, enlarge leadingly process is carried out and after being sampled by A/D converter through front-end amplifier, convert digital signal to and export processor MCU to, calculate the methane content in seawater.
Certainly, also the work calculating methane gas content can be turned and be completed by monitoring equipment waterborne or bank station, namely, the digital signal received adopts wired or wireless mode to be uploaded to monitoring equipment waterborne or bank station by telecommunication circuit by processor MCU, is completed the calculating of the methane content in seawater by the computing machine in monitoring equipment waterborne or bank station.
After detection, open air pump 11 and single-way scavenge valve 12, the gas in sensing chamber 9 is drained in sample water tank 3, until sensing chamber 9 is evacuated.Then, open isolation valve 13, the liquid chamber 602 of gas-liquid separation chamber 6 be communicated with sample water tank 3, utilize the swabbing action of unwatering pump 14 to be pumped in sample water tank 3 by the seawater in liquid chamber 602, with the seawater in sample water tank 3 together cyclic permutation go out.
The gas concentration detection apparatus of the present embodiment has original position, in real time, be convenient to the features such as multiple space and time scales quantitative observation, volume is little, easy and simple to handle, accuracy of detection is high, the observation position of specifying can be placed on monitor continuously by cloth, and can be chemical with other, physical sensors become one realize continuous under water, real-time monitored, for detecting methane in seawater, ethene, the exception of the gas concentrations such as propane, find that new gas hydrate are composed and deposit region, the seepage being deeply familiar with sea bed gas hydrate provides new observation method to Global climate change and global carbon Effect study, be with a wide range of applications in marine environment change and global climate change study and seabed resources exploitation.
Certainly; the above is only a kind of preferred implementation of the present utility model; it should be noted that; for those skilled in the art; under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (10)

1. detect a device for multiple gases concentration in seawater, it is characterized in that: comprise pressure-resistant cabin and be arranged on reduction valve in described pressure-resistant cabin, sample water tank, flow pump, gas-liquid separation chamber, sensing chamber, air pump, unwatering pump and outlet valve; The bulkhead of described pressure-resistant cabin is provided with water inlet and water delivering orifice, and described water delivering orifice is communicated with sample water tank with unwatering pump by outlet valve; Seawater after seawater pressure is reduced to normal pressure by reduction valve, enters into sample water tank by water inlet, and the seawater in sample water tank keeps circulating with the seawater in the pressure-resistant cabin external world and exchanges under the acting in conjunction of reduction valve and unwatering pump; When carrying out seawater sampling, the seawater in sample water tank is pumped in gas-liquid separation chamber by flow pump and carries out gas-liquid separation, and isolated gas enters into sensing chamber; Described sensing chamber is provided with infrared light supply and pyroelectric infrared sensor, infrared light supply launches the gas in infrared radiation sensing chamber, the infrared ray transmitted through described gas is received by pyroelectric infrared sensor, and converts electric signal to and export control circuit to; Described air pump aspirates the gas in sensing chamber and is disposed in sample water tank after detection terminates.
2. the device of multiple gases concentration in detection seawater according to claim 1, it is characterized in that: the barrier film being provided with permeable watertight in described gas-liquid separation chamber, by described barrier film, gas-liquid separation chamber is divided into upper and lower two chambers, top is air chamber, and below is liquid chamber; Described sample water tank is communicated with described liquid chamber with outlet pipeline respectively by inlet pipeline, and described flow pump is arranged in described inlet pipeline, in described outlet pipeline, be provided with isolation valve.
3. the device of multiple gases concentration in detection seawater according to claim 2, is characterized in that: described barrier film is silicone resin film or poly tetrafluoroethylene.
4. the device of multiple gases concentration in detection seawater according to claim 2, it is characterized in that: in described inlet pipeline, be also provided with the retaining valve limiting seawater and flow from sample water tank to flow pump, described retaining valve is between sample water tank and flow pump.
5. the device of multiple gases concentration in detection seawater according to claim 1, is characterized in that: described air pump is connected to the bottom of sample water tank by gas piping, in described gas piping, is provided with scavenging air valve.
6. the device of multiple gases concentration in detection seawater according to claim 1, is characterized in that: described water inlet connects reduction valve by inlet pipeline, is provided with the filtrator for filtering sea impurities in water in described inlet pipeline.
7. the device of multiple gases concentration in detection seawater according to any one of claim 1 to 6, it is characterized in that: on two relative sidewalls of described sensing chamber, offer a transparent windows respectively, the remainder of sensing chamber is made up of light-proof material; Described infrared light supply is just laid one of them transparent windows, launches infrared light and is injected in sensing chamber by described transparent windows; Described pyroelectric infrared sensor is just laid another one transparent windows, receives the infrared light transmitted.
8. the device of multiple gases concentration in detection seawater according to claim 7, it is characterized in that: described pyroelectric infrared sensor is Dual-channel pyroelectric infrared sensor, comprise Measurement channel and reference channel, the infrared wavelength of gas absorption to be checked is determined according to the kind of gas to be checked, and then select the optical filter of corresponding wavelength to be with it arranged in the Measurement channel of pyroelectric infrared sensor, to receive the light signal of described wavelength.
9. the device of multiple gases concentration in detection seawater according to any one of claim 1 to 6, it is characterized in that: in described control circuit, be provided with amplifier, analog to digital converter, processor and pwm circuit, the electric signal exported by described pyroelectric infrared sensor carries out after amplification process through amplifying circuit, export analog to digital converter to and convert digital signal to, and be sent to processor; Described processor exports the pwm signal of certain modulating frequency to pwm circuit, is controlled the switching frequency of infrared light supply by pwm circuit.
10. the device of multiple gases concentration in detection seawater according to claim 9, is characterized in that: described processor connects memory circuit and telecommunication circuit, carries out data interaction by telecommunication circuit and monitoring equipment waterborne or bank station.
CN201520162985.8U 2015-03-23 2015-03-23 A kind of device detecting multiple gases concentration in seawater Withdrawn - After Issue CN204462001U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104697952A (en) * 2015-03-23 2015-06-10 山东省科学院海洋仪器仪表研究所 Device for carrying out concentration detection on variety of gas in seawater
CN106092937A (en) * 2016-08-17 2016-11-09 青岛佳明测控科技股份有限公司 Use the molecular absorption spectrometer of gas-liquid separation membrane

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104697952A (en) * 2015-03-23 2015-06-10 山东省科学院海洋仪器仪表研究所 Device for carrying out concentration detection on variety of gas in seawater
CN104697952B (en) * 2015-03-23 2017-09-15 山东省科学院海洋仪器仪表研究所 Device for the multiple gases in seawater to be carried out with Concentration Testing
CN106092937A (en) * 2016-08-17 2016-11-09 青岛佳明测控科技股份有限公司 Use the molecular absorption spectrometer of gas-liquid separation membrane

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AV01 Patent right actively abandoned

Granted publication date: 20150708

Effective date of abandoning: 20170915

AV01 Patent right actively abandoned