CN202166605U - Fluoro aromatic hydrocarbon polymer capillary tube gas permeation membrane sample cell and measurer - Google Patents
Fluoro aromatic hydrocarbon polymer capillary tube gas permeation membrane sample cell and measurer Download PDFInfo
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- CN202166605U CN202166605U CN2011202681451U CN201120268145U CN202166605U CN 202166605 U CN202166605 U CN 202166605U CN 2011202681451 U CN2011202681451 U CN 2011202681451U CN 201120268145 U CN201120268145 U CN 201120268145U CN 202166605 U CN202166605 U CN 202166605U
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Abstract
The utility model relates to the carbon dioxide measurement field, in particular to a fluoro aromatic hydrocarbon polymer capillary tube gas permeation membrane sample cell, comprising (1) a sleeve pipe, (2) a fluoro aromatic hydrocarbon polymer capillary tube, (3) a first sample inlet pipe and a second sample inlet pipe, (4) a first light-liquid coupler and a second light-liquid coupler and (5) a first indicator tube and a second indicator tube, wherein a filling opening and a discharge port are respectively arranged at a left side and a right side of the sleeve pipe, the length of the fluoro aromatic hydrocarbon polymer capillary tube is longer than that of the sleeve pipe, the capillary tube is inserted from a left end of the sleeve and is inserted out from a right end of the sleeve pipe, the first sample inlet pipe is connected with the filling opening of the sleeve pipe and the second sample inlet pipe is connected with the discharge port of the sleeve pipe, the first light-liquid coupler is provided with a three-end joint and the second light-liquid coupler is provided with a three-end joint, the first indicator tube is connected with a second connector of the first light-liquid coupler and the second indicator tube is connected with a second connector of the second light-liquid coupler. Compared with the prior art, the fluoro aromatic hydrocarbon polymer capillary tube gas permeation membrane sample cell has high sensitivity and large dynamic range, and is particularly suitable for researching and developing a CO2 partial pressure field measurement instrument with high precision, rapid response and low power consumption.
Description
Technical field
The utility model relates to the carbon dioxide field of measurement, particularly a kind of fluorinated aromatic hydrocarbon polymer capillary tube gas-permeable membrane sample cell and measuring appliance.
Background technology
The ocean is as the regulator of global climate, in the regulation and control Atmospheric CO
2Aspects such as concentration play crucial effects, ocean CO
2Dividing potential drop (pCO
2) direct mensuration have great importance to studying extra large gas exchange, sea life process, marine carbon circulation and even Global climate change.
Recent two decades comes, in-site measurement sea surface C O
2The sensor technology of dividing potential drop makes considerable progress, and research shows, CO
2The dividing potential drop fibre optic chemical sensor will be the CO of high precision, fast-response, low-power consumption, high letter price ratio
2The developing direction of partial pressure sensor.
Fibre optic chemical sensor is measured pCO
2Based on the photometric measurement of pH value, key for design is embodied in the CO to the responsive indicator of pH value
2In the design of permeable membrane.The shortcoming of researchers institute sensor designed is mainly reflected at present: the measurement dynamic range is limited, precision is generally lower, the response time is longer.The CO of its use
2Mostly gas-permeable membrane is to be processed by silicone plasties (Silicone) or polytetrafluoroethylene (PTFE), during measurement directly with CO
2Gas-permeable membrane is made cast, both as gas-permeable membrane, simultaneously again as optical measurement unit.But because the refractive index of silicone plasties (Silicone) and these two kinds of materials of polytetrafluoroethylene (PTFE) is higher than the refractive index of indicator, light can't be realized total reflection in pipe, and after light that light source sends passed through indicator, the loss of light intensity was bigger.
How the good gas-permeable membrane sample cell that is used for atmosphere, the measurement of seawater CO2 dividing potential drop of design performance becomes the focal issue that the instrumental analysis field is paid close attention to.
A kind of new material that E.I.Du Pont Company releases---fluorinated aromatic hydrocarbon polymer (Teflon AF2400) provides possibility for addressing this problem.The gas permeability of Teflon AF2400 is splendid, and refractive index is 1.29, and lower than water (~ 1.33), the kapillary that uses this material to process both can be used as gas-permeable membrane, can be used as the optical measurement sample cell of long light path again.
But prior art also is that the gas-permeable membrane sample cell that is used for atmosphere, the measurement of seawater CO2 dividing potential drop based on Teflon AF2400 capillary design is provided, the gas-permeable membrane sample cell of prior art, and precision is not high, responds unhappy.
The utility model content
It is a kind of based on Teflon AF2400 gas-permeable membrane sample cell capillaceous that first purpose of the utility model is to provide; To solve prior art is that the gas-permeable membrane sample cell capillaceous based on Teflon AF2400 can be provided; And the gas-permeable membrane sample cell of prior art; Precision is not high, responds unhappy technical matters.
In order to realize first purpose of the utility model, the technical scheme of employing is:
A kind of fluorinated aromatic hydrocarbon polymer capillary tube gas-permeable membrane sample cell; The sample cell that is used for measuring samples partial pressure of carbon dioxide value measuring appliance, said sample cell left end is connected with the light source of measuring appliance, and right-hand member is connected with the spectrometer of measuring appliance; Light signal is from the left end input of sample cell; After the process sample cell is analyzed sample, be sent to spectrometer to analytic signal to obtain the partial pressure value of carbon dioxide in the sample, said sample cell comprises:
(1) sleeve pipe, the sleeve pipe left and right sides is respectively arranged with inlet and floss hole, also comprises;
(2) length is greater than the fluorinated aromatic hydrocarbon polymer capillary tube of casing length, and said kapillary inserts from the left end of sleeve pipe, inserts out from the right-hand member of sleeve pipe, also comprises;
(3) first sample introduction pipe that links to each other with the sleeve pipe inlet and the second sample introduction pipe that links to each other with the sleeve pipe floss hole also comprise;
(4) first smooth liquid coupling mechanism that is provided with three end connectors and the second smooth liquid coupling mechanism that is provided with three end connectors; The 3rd joint of the first smooth liquid coupling mechanism is connected with the sleeve pipe left end; And link to each other with the left end of fluorinated aromatic hydrocarbon polymer capillary tube; The 3rd joint of the second smooth liquid coupling mechanism is connected with the sleeve pipe right-hand member, and links to each other with the right-hand member of fluorinated aromatic hydrocarbon polymer capillary tube, and first joint of the first smooth liquid coupling mechanism is connected with light source through first optical fiber; First joint of the second smooth liquid coupling mechanism is connected with spectrometer through second optical fiber, also comprises;
(5) the second indicator pipe that the first indicator pipe that is connected with second joint of the first smooth liquid coupling mechanism is connected with second joint with the second smooth liquid coupling mechanism.
As a kind of preferred version, said first optical fiber inserts through first contact pin in first joint of the first smooth liquid coupling mechanism, and said second optical fiber inserts in first joint of the second smooth liquid coupling mechanism through second contact pin.
As further preferred version; Said first contact pin and second contact pin are ceramic contact pin; The distance of the front end face of said first contact pin front end face and left end capillaceous is 20～1000 microns, and the distance of the front end face of said second contact pin front end face and right-hand member capillaceous is 20～1000 microns.
As another kind of preferred version: the right ends of said sleeve pipe is provided with groove; Said sample cell also comprises and is arranged on the first watertight parts that are complementary with groove in the sleeve pipe left end groove; Be arranged on the second watertight parts that are complementary with groove in the sleeve pipe right-hand member groove; Said kapillary inserts from the first watertight parts, inserts out from the second watertight parts.
As further preferred version, the groove of the right ends of said sleeve pipe is a cylinder shape groove, and the said first watertight parts and the second watertight parts are the watertight cylinder.
As further preferred version again, said watertight parts are fixed through swivel nut, are provided with the O-ring seal that is used for axial watertight between watertight parts and the groove.Said O-ring seal is the O RunddichtringO.
As further preferred version again, said kapillary respectively stretches out certain-length from the first watertight parts and the second watertight parts, and length range is 25～33 centimetres.
As preferred version further; Said internal diameter capillaceous satisfies inequality: 50 μ m≤capillary inner diameters≤2000 μ m; External diameter capillaceous satisfies inequality: 100 μ m≤kapillary external diameter≤2600 μ m, and length capillaceous satisfies inequality: 5cm≤capillary pipe length≤500cm;
Said casing inner diameter satisfies inequality 3cm≤casing inner diameter≤30cm, and the cover external diameter of pipe satisfies inequality 5cm≤cover external diameter of pipe≤36cm.
As further more preferred version, first joint of the said first smooth liquid coupling mechanism and the second smooth liquid coupling mechanism is coaxial with the 3rd joint, and second joint and first, the 3rd joint axis all are useful on the water-stop circle to vertical in each joint; Said O-ring seal is the O RunddichtringO;
Said first optical fiber and second optical fiber are silica fibre;
Each joint of the said first smooth liquid coupling mechanism and the second smooth liquid coupling mechanism is the hollow fixed screw, and the first smooth liquid coupling mechanism and sleeve pipe left end be through being threaded, and the second smooth liquid coupling mechanism and sleeve pipe right-hand member are through being threaded;
First joint of first, second light liquid coupling mechanism is coaxial with the 3rd joint, and second joint and first, the 3rd joint axis all have the O RunddichtringO to be used for watertight to vertical in each joint.
Second purpose of the utility model is to provide a kind of measuring appliance of partial pressure of carbon dioxide value of measuring samples, and its sample cell adopts the described sample cell of first purpose of the utility model.
In order to realize second purpose, the technical scheme of employing is following:
A kind of measuring appliance of partial pressure of carbon dioxide value of measuring samples comprises sample cell, light source and spectrometer; Its sample cell adopts the described sample cell of first purpose of the utility model; Said sample cell left end is connected with light source, and right-hand member is connected with spectrometer, and light signal is from the left end input of sample cell; After the process sample cell is analyzed sample, be sent to spectrometer to analytic signal to obtain the partial pressure value of carbon dioxide in the sample.
The structure of the utility model is a symmetrical structure, and light signal can get into from first or second silica fibre, and indicator buffer solution can get into from the first or second indicator pipe, and atmosphere, seawater sample can get into from the first or second sample introduction pipe.
Compared with prior art, the utlity model has following advantage: the Teflon AF2400 kapillary based on high osmosis Teflon material both had been used as CO
2The infiltration sensitive element is also as the absorbance measuring pond; Sensing sensitivity is high, dynamic range is big; Be aided with advanced control technology, pollution prevention technology, sampling technique, be very suitable for researching and developing the grappling platform, observation, high precision, fast-response, low-power consumption the automatically CO of long-time sequence
2Dividing potential drop in-site measurement instrument.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is carried out detailed description.
As shown in the figure, a kind of atmosphere, seawater CO of being used for
2The Teflon AF2400 capillary tube gas-permeable membrane sample cell that dividing potential drop is measured; It comprises silica fibre 1, silica fibre 14; Light liquid coupling mechanism 2, light liquid coupling mechanism 12, Teflon AF2400 kapillary 8, sleeve pipe 6, watertight cylinder 5; Watertight cylinder 11, fastening swivel nut 4, fastening swivel nut 10, indicator pipe 3, indicator pipe 13 and sample introduction pipe 7, sample introduction pipe 9.
Silica fibre 1 links to each other with first joint of light liquid coupling mechanism 2; Indicator pipe 3 links to each other with second joint of light liquid coupling mechanism 2; The Teflon AF2400 kapillary 8 of the left end of watertight cylinder 5 links to each other with the 3rd joint of light liquid coupling mechanism 2, and the 3rd joint of light liquid coupling mechanism 2 is through being threaded into the left end of watertight cylinder 5; Silica fibre 14 links to each other with first joint of light liquid coupling mechanism 12; Indicator pipe 13 links to each other with second joint of light liquid coupling mechanism 12; The Teflon AF2400 kapillary 8 of the right-hand member of watertight cylinder 11 links to each other with the 3rd joint of light liquid coupling mechanism 12, and the 3rd joint of light liquid coupling mechanism 12 is through being threaded into the right-hand member of watertight cylinder 11.
Silica fibre 1 inserts in first joint of light liquid coupling mechanism 2 through ceramic contact pin, and the distance between ceramic contact pin front end face and Teflon AF2400 kapillary 8 front end faces is at 1000 microns; Silica fibre 14 inserts in first joint of light liquid coupling mechanism 12 through ceramic contact pin, and the distance between ceramic contact pin front end face and Teflon AF2400 kapillary 8 front end faces is at 1000 microns.
Atmosphere or seawater sample get into sleeve pipe by sample introduction pipe 7, are discharged by sample introduction pipe 9; Indicator buffer solution gets into Teflon AF2400 kapillary 8 by indicator pipe 3, is discharged by indicator pipe 13.The CO of sample in the sleeve pipe
2Penetrate Teflon AF2400 kapillary 8 walls through diffusion and get into indicator buffer solution; Reactions such as concurrent unboiled water closes, dissociates, colour developing reach balance; The light that light source sends is transferred in the Teflon AF2400 kapillary 8 through silica fibre 1, light liquid coupling mechanism 2; After the indicator buffer solution absorption that reaches exchange, molecular balance, via light liquid coupling mechanism 12, silica fibre 14 transfers signals to the high precision spectrometer again; And then computing formula that can through type 1～formula 4, calculate the CO of sample
2Partial pressure value.
(formula 2)
A in the formula 1 (λ) is that sample is the absorbance at λ place at wavelength, S
wBe that sample is the spectrum at λ place at wavelength (λ), D
w(λ) be the dark current of sample, S
RBe that pure water is the spectrum at λ place at wavelength (λ), D
R(λ) be the dark current of pure water, L is an optical path length.
A in the formula 3
RBe that instrument is the ratio (the sour attitude of indicator and the absorption peak of alkali attitude are respectively at 434nm and 620nm) of 434nm and 620nm place absorbance at wavelength, ε
434 (HIn)And ε
434 (HIn)The sour attitude that is indicator is respectively the molar absorptivity under 434nm and the 620nm at wavelength.
K in the formula 4
1, K
2Be respectively the firsts and seconds ionic dissociation equilibrium constant of carbonic acid, K
hBe Henry's constant, K
aBe indicator ionic dissociation equilibrium constant, C
HInBe the total concentration of indicator, [Na
+] be the concentration of Na ion in the indication agent solution, K
wIt is the ionic dissociation equilibrium constant of water.
In the present embodiment, silica fibre 1,14 is: 1 meter of length, core diameter are 600 microns, ceramic contact pin, the silica fibre of joint SMA905; Teflon AF2400 kapillary 8 is: 1.0 millimeters of internal diameters, and 1.6 millimeters of external diameters, length is 265 millimeters; Indicator pipe 3,13 is: 1.6 millimeters of internal diameters, external diameter are 3.2 millimeters silica gel hard tube; Sleeve pipe 6 is: 10 millimeters of internal diameters, 15 millimeters of external diameters, 230 millimeters of length.
Light liquid coupling mechanism 2, light liquid coupling mechanism 12 adopt organic glass processing; Sleeve pipe 6, watertight cylinder 5, watertight cylinder 11, fastening swivel nut 4, fastening swivel nut 10, indicator pipe 3, indicator pipe 13 and sample introduction pipe 7, sample introduction pipe 9 all adopt stainless steel 316L processing.
Claims (10)
1. fluorinated aromatic hydrocarbon polymer capillary tube gas-permeable membrane sample cell is used for the sample cell of measuring samples partial pressure of carbon dioxide value measuring appliance, and said sample cell left end is connected with the light source of measuring appliance; Right-hand member is connected with the spectrometer of measuring appliance; Light signal after the process sample cell is analyzed sample, is sent to spectrometer to analytic signal to obtain the partial pressure value of carbon dioxide in the sample from the left end input of sample cell; It is characterized in that said sample cell comprises:
(1) sleeve pipe, the sleeve pipe left and right sides is respectively arranged with inlet and floss hole, also comprises;
(2) length is greater than the fluorinated aromatic hydrocarbon polymer capillary tube of casing length, and said kapillary inserts from the left end of sleeve pipe, inserts out from the right-hand member of sleeve pipe, also comprises;
(3) first sample introduction pipe that links to each other with the sleeve pipe inlet and the second sample introduction pipe that links to each other with the sleeve pipe floss hole also comprise;
(4) first smooth liquid coupling mechanism that is provided with three end connectors and the second smooth liquid coupling mechanism that is provided with three end connectors; The 3rd joint of the first smooth liquid coupling mechanism is connected with the sleeve pipe left end; And link to each other with the left end of fluorinated aromatic hydrocarbon polymer capillary tube; The 3rd joint of the second smooth liquid coupling mechanism is connected with the sleeve pipe right-hand member, and links to each other with the right-hand member of fluorinated aromatic hydrocarbon polymer capillary tube, and first joint of the first smooth liquid coupling mechanism is connected with light source through first optical fiber; First joint of the second smooth liquid coupling mechanism is connected with spectrometer through second optical fiber, also comprises;
(5) the second indicator pipe that the first indicator pipe that is connected with second joint of the first smooth liquid coupling mechanism is connected with second joint with the second smooth liquid coupling mechanism.
2. sample cell according to claim 1; It is characterized in that; Said sample cell also comprises first contact pin and second contact pin; Said first optical fiber inserts through first contact pin in first joint of the first smooth liquid coupling mechanism, and said second optical fiber inserts in first joint of the second smooth liquid coupling mechanism through second contact pin.
3. sample cell according to claim 2; It is characterized in that; Said first contact pin and second contact pin are ceramic contact pin; The distance of the front end face of said first contact pin front end face and left end capillaceous is 20～1000 microns, and the distance of the front end face of said second contact pin front end face and right-hand member capillaceous is 20～1000 microns.
4. sample cell according to claim 1; It is characterized in that: the right ends of said sleeve pipe is provided with groove; Said sample cell also comprises and is arranged on the first watertight parts that are complementary with groove in the sleeve pipe left end groove; Be arranged on the second watertight parts that are complementary with groove in the sleeve pipe right-hand member groove, said kapillary inserts from the first watertight parts, inserts out from the second watertight parts.
5. sample cell according to claim 4 is characterized in that, the groove of the right ends of said sleeve pipe is a cylinder shape groove, and the said first watertight parts and the second watertight parts are the watertight cylinder.
6. according to claim 4 or 5 described sample cells, it is characterized in that said watertight parts are fixed through swivel nut, be provided with the O-ring seal that is used for axial watertight between watertight parts and the groove.
7. according to claim 4 or 5 described sample cells, it is characterized in that said kapillary respectively stretches out certain-length from the first watertight parts and the second watertight parts, length range is 25-33 centimetre.
8. according to claim 4 or 5 described sample cells; It is characterized in that: said internal diameter capillaceous satisfies inequality: 50 μ m≤capillary inner diameters≤2000 μ m; External diameter capillaceous satisfies inequality: 100 μ m≤kapillary external diameter≤2600 μ m, and length capillaceous satisfies inequality: 5cm≤capillary pipe length≤500cm;
Said casing inner diameter satisfies inequality 3cm≤casing inner diameter≤30cm, and the cover external diameter of pipe satisfies inequality 5cm≤cover external diameter of pipe≤36cm.
9. according to claim 4 or 5 described sample cells; It is characterized in that: first joint of the said first smooth liquid coupling mechanism and the second smooth liquid coupling mechanism is coaxial with the 3rd joint; Second joint and first, the 3rd joint axis all are useful on the water-stop circle to vertical in each joint;
Said first optical fiber and second optical fiber are silica fibre;
Each joint of the said first smooth liquid coupling mechanism and the second smooth liquid coupling mechanism is the hollow fixed screw, and the first smooth liquid coupling mechanism and sleeve pipe left end be through being threaded, and the second smooth liquid coupling mechanism and sleeve pipe right-hand member are through being threaded.
10. the measuring appliance of the partial pressure of carbon dioxide value of a measuring samples comprises sample cell, light source and spectrometer; It is characterized in that said sample cell is the described sample cell of claim 1, said sample cell left end is connected with light source; Right-hand member is connected with spectrometer; Light signal after the process sample cell is analyzed sample, is sent to spectrometer to analytic signal to obtain the partial pressure value of carbon dioxide in the sample from the left end input of sample cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202681451U CN202166605U (en) | 2011-07-27 | 2011-07-27 | Fluoro aromatic hydrocarbon polymer capillary tube gas permeation membrane sample cell and measurer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202681451U CN202166605U (en) | 2011-07-27 | 2011-07-27 | Fluoro aromatic hydrocarbon polymer capillary tube gas permeation membrane sample cell and measurer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202166605U true CN202166605U (en) | 2012-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202681451U Expired - Fee Related CN202166605U (en) | 2011-07-27 | 2011-07-27 | Fluoro aromatic hydrocarbon polymer capillary tube gas permeation membrane sample cell and measurer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202166605U (en) |
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2011
- 2011-07-27 CN CN2011202681451U patent/CN202166605U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120314 Termination date: 20170727 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |