CN2099973U - Optical fiber gas chemical sensor - Google Patents
Optical fiber gas chemical sensor Download PDFInfo
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- CN2099973U CN2099973U CN 91214863 CN91214863U CN2099973U CN 2099973 U CN2099973 U CN 2099973U CN 91214863 CN91214863 CN 91214863 CN 91214863 U CN91214863 U CN 91214863U CN 2099973 U CN2099973 U CN 2099973U
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Abstract
The utility model discloses an optical fiber gas chemical sensor belonging to an optical fiber chemical sensor for the measurement of gas content, in particular to the measurement of sulfur dioxide gas. The utility model mainly comprises a sensor body, optical fiber, and a sensing element. Measured gas diffuses into the optical fiber gas chemical sensor to carry out chemical reaction with chemical reagents in the sensing element. As a result, the optical characteristic of the sensing element is changed, and the optical fiber transmits the information with variable quantity. The utility model has the advantages of simple structure, low price, and convenient operation. In the measurement of sulfur dioxide gas, the utility model also has the advantages of sensitive detection, quick response speed, and high selectivity. The optical fiber gas chemical sensor can be used in not only the monitoring of sulfur dioxide gas for flue gas and other systems, but also the measurement of the content of other gases under the conditions of the selection of appropriate sensing elements.
Description
The utility model belongs to Fibre Optical Sensor, is a kind of Fibre Optical Sensor of measuring gas content.This sensor is particularly useful for the mensuration of sulfur dioxide gas.
Sulphuric dioxide is important atmosphere pollution, is the basic reason that causes current acid rain serious, and for this reason, the monitoring and the improvement of sulphuric dioxide is all attached great importance in countries in the world.
It is the various Industrial Boilers of fuel, the flue gas that the chamber fire grate is put that sulphuric dioxide is mainly derived from coal, heavy oil.Monitoring the content of sulfur dioxide in these Industrial Boilers, the furnace flue gas, is the basic basis of formulating control measures, adjusting the CONTROL PROCESS parameter.At present, the monitoring means for sulfur dioxide of flue gases has two kinds: a kind of is to adopt the automatic analytical instrument monitoring.Though this instrument is measured rapidly accurately, also bigger for control directive significance in the actual production, it not only itself costs an arm and a leg, but also it is supporting with it to require to have complicated sampling and sample to give disposal system, invests very big; Another kind is to use artificial chemical analysis monitoring.This method is advanced pedestrian worker's sampling, then sample is delivered the laboratory and is made concrete chemical analysis.Obviously, the shortcoming of this monitoring means is that workload is big, need expend a large amount of time and manpower, and little to the directive significance of actual production control.
Sensor technology is the direction of modern automatic monitoring technical development, but very few for number for measuring the good sensor of gas content performance at present, especially the sensor of light transmitting fiber class.By retrieval, have only and introduced one piece of JP62 in the CA109:141724V digest, 209, No. 357 publications.This patent relates to a kind of Fibre Optical Sensor of measuring ammonia, and it is the hollow tube of a both ends open, and a slice ventilated membrane is equipped with in the pipe bottom, and the electrolyte solution that contains the PH indicator is housed in the pipe.Ammonia causes that solution PH changes after dissolving in this solution by the ventilated membrane diffusion, and Optical Fiber Transmission PH change information is measured as ammonia content.Thereby this sensor is except only being applicable to that mensuration is to the influential gas of its supporting solution PH, also has a deadly defect, it is sensitive element system non-selectivity, can not repel the influence that the interference component in the coexistence component gases is arranged during detection, applicable surface is narrow, and especially can not be as the mensuration of sulfur dioxide of flue gases.Because in the stack gases that contains sulphuric dioxide of industrial discharging, all contain carbon dioxide, and concentration of carbon dioxide is than big tens of times of the concentration of sulphuric dioxide, during detection, the change of the PH that is caused by carbon dioxide will substantially exceed sulphuric dioxide, seriously disturb the mensuration of sulphuric dioxide.
In view of the problem that prior art exists, task of the present utility model provides a kind of novel optical-fibre gas chemical sensor.This sensor construction is simple, and is cheap, easy to use, and when measuring the sulfur dioxide gas body burden, detection is sensitive, response speed is fast, and the selectivity height has good reappearance.
In order to finish above-mentioned task, after the utility model participated in chemical reaction according to some tested gas, system can produce the character of changes in optical properties, has proposed a kind of like this technical solution of optical-fibre gas chemical sensor:
This technical scheme mainly comprises sensor body, light transmitting fiber and sensitive element.Cylindrical cavity is arranged in the sensor body, and wall one side has inlet channel, has a light transmitting fiber to insert mouthful on the adjacent opposite side wall of inlet channel, and light transmitting fiber inserts and mouthful communicates with the interior cylindrical cavity of body.Insert the sensitive element that the band light reflecting mirror is housed in mouthful relative cavity at light transmitting fiber, can produce change of optical property after this sensitive element and the reaction of tested aerochemistry.Light transmitting fiber adopts the two branch of " y " type optical fiber, is contained in the insertion mouth of sensor body.
During mensuration, sensor is placed test zone, tested gas is at once in inlet channel diffuses into the sensor body cavity, react rapidly with the sensitive element in the cavity, the optical characteristics of sensitive element is changed, and the information feedback of changes in optical properties is gone out to fiber optic transmission by the light reflecting mirror on it.Proportionate relationship according between variation of system absorbance and the tested gas can draw tested gas content.
Description of drawings:
Fig. 1 is an embodiment of the present utility model---intermittently measure the cross-sectional view of formula optical-fibre gas chemical sensor;
Fig. 2 is another embodiment of the present utility model---the cross-sectional view of METHOD FOR CONTINUOUS DETERMINATION formula optical-fibre gas chemical sensor;
Two kinds of sensors that accompanying drawing 1,2 is disclosed when need are measured different types of gas, as long as change suitable sensitive element, can be finished the sensing task that detects.
Be example with the sensor of measuring the sulfur dioxide gas body burden below, the utility model is described in further detail to use embodiment in conjunction with the accompanying drawings.
Embodiment one:
This example is to measure the batch (-type) fibre optic chemical sensor of sulfur dioxide gas body burden, and structure is shown in figure one.It mainly comprises sensor body (1), light transmitting fiber (2) and sensitive element (3).Sensor body (1) is made of body bottom (4) and body body (5), between them with being threaded.There is a round boss at body bottom (4) middle part, has groove (6) on the boss, and groove (6) can be cylindrical, and screw thread is opened around boss.During detection, the sensitive element (3) of band light reflecting mirror just is seated in the groove (6), not only can make sensitive element (3) in the horizontal direction by relative fixed, also because of body bottom (4) can screw off, and makes exchanging for of sensitive element (3) very convenient.The cylindrical cavity that one one end opening is arranged in the body body (5), cavity port have internal thread and are connected with body bottom (4).Cavity Lower Half wall one side in the sensor body (1) of body bottom (4) and body body (5) formation has inlet channel (7).Inlet channel (7) is gone up with the air inlet short tube (8) that has been threaded, and the port lid (9) that can regulate the air inflow size is housed on the port of short tube (8), with adapt to the sulphuric dioxide of measuring variable concentrations with to the different needs of response speed requirement.This port lid (9) can be made the serial port lid that pore size differs, and also can make the port lid identical with the camera aperture structure.
Body bottom (4) groove (6) over against the top wall, be to have a threaded light transmitting fiber on the adjacent opposite side wall of inlet channel (7) to insert mouthful (10), available joint threaded plastic tube of port of " y " type two branch optical fiber (2) or metal tube put, and are fixed therein." y " type optical fiber is a branch of to be incident optical, and a branch of is detection fiber.
Sensitive element is made up of a reagent ware (11) and the reagent that is contained in wherein.The outside surface metal-plated membrane of reagent ware (11) makes reagent ware (11) become light reflecting mirror simultaneously again.Reagent is according to the redox reaction of sulphuric dioxide
Can select some redox indicator for use, as lissamine green
(Lissamine green
), orchid at night (Night blue), phenanthroline (Phenanthlorine) complex compound, but dinuclear complex (Fe(III) wherein to select phenanthroline for use
2(phenanthroline)
4(OH)
2)
4+For best.Because this reagent and sulfur dioxide gas one act on, be reduced into the mononuclear complex (Fe(II) (phenanthroline) of phenanthroline at once
3)
2+, these two kinds of complex compounds are got on very well for the monochromatic light of 510nm, and the former absorbance is very little, and the latter's absorbance is then very big, and detection sensitivity is than other indicator height; Secondly, also because the dinuclear complex of phenanthroline has fabulous selectivity to the sulphuric dioxide in the mixed gas, can avoid the interference of other coexistence component.
In order to reduce the loss that light is propagated in sensor, the accuracy that improve to detect is inlet channel (7) highest level line more than, light transmitting fiber inserts in mouthful sensor cavities of (10) below and lay lens (12) with screw thread hold-down ring (14) support.Because these lens (12) are biconvex lens, so be placed with a packing ring (13),, minute surface produces wearing and tearing in order to avoid directly contacting with optic fiber end face in the top of lens (12), influence measurement result.
During detection, at first sensitive element (3) is put into the groove (6) of body base (4), screwed in the sensor body (1); Next connects light source, and the monochromatic light of 510nm is penetrated on sensitive element (3) by incident optical.At this moment obtain an absorbance; Then sensor is put into the monitored area, gas spreads from the cavity of diffusing opening to sensor body (1) of port lid (9) at once, rapidly with the sensitive element (3) that exposes in cavity in reagent reacting, make the dinuclear complex of phenanthroline be reduced into mononuclear complex, absorbance increases, and the light quantity that the light reflecting mirror on the sensitive element (3) reflects to detection fiber reduces.Because the mononuclear complex concentration of the content of sulphuric dioxide and the phenanthroline of generation has relation, and then also with absorbance relation is arranged, so can be according to the content of how much knowing sulphuric dioxide of absorbance.
Intermittently measure the formula optical-fibre gas chemical sensor and be mainly used in the few occasion that does not need continuous monitoring again of testing time every day, its advantage is to save reagent.
Embodiment two:
This example is to measure the continous way fibre optic chemical sensor of sulfur dioxide gas body burden, and structure as shown in Figure 2.It mainly comprises sensor body (1), light transmitting fiber (2) and sensitive element (3).Sensor body (1) partly is made of reactor body (15) and sensing body (16) two.A cavity is arranged in the reactor body (15), and the lower wall of this cavity is the inclined-plane, on the wall of bottom, inclined-plane a threaded hole (17) is arranged.Have reagent inlet (18) and gas vent (19) on the wall of top, inclined-plane successively side by side.Inlet channel (7) is positioned on the wall by the adjacent opposite side of reagent inlet (18), and is also the same as the air inlet short tube (8) that has been threaded with embodiment one on it, and the port lid (9) that can regulate the air inflow size is housed on the port of short tube (8).The frame mode that port lid adopts is identical with embodiment one with its effect.
A cylindrical cavity is arranged in the sensing body (16), and the cavity lower wall is a hollow posts cock body (20), and this plunger body surfaces externally and internally all has screw thread, after compressing when being threaded with sensing body (16), can make sensitive element detection cell location.The endoporus of plunger body (20) is light transmitting fiber and inserts mouthful (10).Near a threaded hole (21) being arranged on the opposite side wall of plunger body (20), threaded hole (17) diameter of this threaded hole (21) on bottom reactor body (15) cavity inclined-plane is identical, and on same horizontal line.Reactor body (15) and sensing body (16) connect as one with a through hole attachment screw (22) by these two threaded holes (17,21).In order to prevent that through hole attachment screw (22) from skidding off, guarantee that reactor body (15) and sensing body (16) cavity are communicated with, threaded hole (21) in this example on the sensing body (16) is not a through hole, but has opened a concentric aperture (31) in the bottom of this threaded hole (21).The cavity wall middle part that sensing body (16) plunger body (20) is relative also has a waste liquid outlet (23).
Sensitive element (3) is made up of detection cell and reagent.Detection cell is a pipe that the bottom is porose, and the outside surface metal-plated membrane makes this pipe become light reflecting mirror simultaneously again.This pipe mouth of pipe also has a circumferential notch, and the through hole in breach and the through hole attachment screw (22) is communicated with it with the concentric aperture (31) of a joint tubule (32) through threaded hole (21) bottom.This routine detection cell is partly formed by three: the catoptron (25) and a planar lens (26) of the hollow reflection tube (24) of a both ends open, band concave spherical surface.The one side and the planar lens (26) of catoptron (25) band concave spherical surface are bonded in hollow reflection tube (24) two ends respectively.One through hole is arranged at catoptron (25) concave spherical surface bottom, and when detection cell was seated in the cavity of sensing body (16), this through hole was communicated with waste liquid outlet (23).Reagent is according to the redox reaction of sulphuric dioxide
Can select some redox indicator for use, these indicator have changes in optical properties after participating in reaction, as lissamine green
(Lissamine green
.), orchid at night (Night blue), phenanthroline (Phenanthlorine) complex compound, wherein dinuclear complex (Fe(III) to select phenanthroline for use
2(phenanthroline)
4(OH)
2)
4+For best.Its reason is identical with embodiment one.Reagent is flowed into by the reagent pipe that is installed on the reagent inlet (18), enters the interfacial reactor (27) and tested gas reaction that are suspended in reactor body (15) cavity.Interfacial reactor (27) is to make closed circular pipe or rectangular pipe by poromerics.Poromerics can be used micropore ceramics, glass fibre or filter paper, and wherein the closed circular endless tube made from micropore ceramics is best.
In order to improve the resistance to overturning of sensor in this example, the propclip gripping member (28) of a band groove is housed in the lower end of sensor body (1), and reactor body (15) and sensing body (16) that this propclip gripping member (28) will be connected as a single entity by through hole attachment screw (22) use lock-screw (29) to be fixed in the groove again.Have a through hole at the bottom of support clip gripping member (28) groove, corresponding with the light transmitting fiber insertion mouthful (10) on the sensing body (16).Available joint threaded plastic tube of port of " y " type two branch light transmitting fibers (2) or metal tube put, and the through hole on passing at the bottom of the groove screws in the light transmitting fiber that is fixed on sensing body (16) and inserts in mouthful (10)." y " type optical fiber is a branch of to be incident optical, and a branch of is detection fiber.
In addition, the pipeline that is arranged in reagent inlet (18), gas vent (19) and waste liquid outlet (23) all uses clamping nut (30) to be fixed on reactor body (15) and the sensing body (16), to increase its steadiness and sealing respectively.
During detection, at first connect light source, the monochromatic light of 510nm is penetrated on the detection cell of sensitive element (3) by incident optical, allow reagent from reagent inlet (18) pipe, flow into and be full of interfacial reactor (27) pipe after ooze out gradually, under action of gravity, drop in downwards along interfacial reactor (27) on the inclined-plane of reactor body (15) cavity, flow in the through hole of bottom screw (22) along the inclined-plane then, enter in the detection cell that is seated in sensing body (16) cavity with being connected tubule (32) through the hole, at this moment obtain an absorbance.Then sensor is put into the monitored area, gas spreads from the cavity of diffusing opening to reactor body (15) of port lid (9) at once, rapidly with the lip-deep reagent reacting of interfacial reactor (27) that is suspended in the cavity, because constantly oozing out of fresh reagent, the reagent mixture that reacted product and unreacted finish is under action of gravity, also drop in downwards on the inclined-plane of reactor body (15) cavity along interfacial reactor (27) surface, suitable then inclined-plane is through screw (22) through hole, tubule (32) enters detection cell, at this moment, absorbance increases, and the light quantity that detection cell reflects to detection fiber reduces.Along with fresh reagent constantly ooze out continuous diffusion, reaction with gas, can continuously measure the variation of content of sulfur dioxide in the gas.Waste liquid after the detection is by the hole of detection cell bottom, and waste liquid outlet (23) pipe from sensing body (16) cavity wall is discharged.Do not participate in the gas coexistence component of reaction, can discharge from the pipe of the gas vent (19) on the reactor body (15) as oxygen, nitrogen, carbon dioxide etc.
In order to save reagent, fresh reagent may command is passed through sensor continuously with the fast body of 50ul/min.
METHOD FOR CONTINUOUS DETERMINATION formula optical-fibre gas chemical sensor is mainly used in production run real-time measurement, the METHOD FOR CONTINUOUS DETERMINATION of control automatically.
Embodiment of the present utility model is not limited to above two kinds.
Compared with the prior art the utility model has following advantages:
1. because the utility model adopts is Modern Transducer Technology, cheap than complexity and the sulfur dioxide analyzer of high price is simple in structure, and also required necessary instrument is also very simple and easy, so can greatly reduce the cost of equipment of sulfur dioxide monitoring.
2. the utility model is fibre optic chemical sensor, is not subjected to the interference of any external electromagnetic field, and job stability is high.
3. when measuring the sulfur dioxide gas body burden, detect sensitivity, fast response time, selective high, have good reappearance, can satisfy the requirement that automatic control system is made a signal source.
4. easy to use, test need not expend plenty of time and manpower, also can select intermittently mensuration formula or METHOD FOR CONTINUOUS DETERMINATION formula according to the needs of actual production control, and exchange for very easy.
5. widely applicable.Not only can be used for the sulfur dioxide gas monitoring of flue gas and other systems, also can select under the suitable sensitive element reagent condition, be used for to produce the mensuration of other gas contents of changes in optical properties.
6. the utility model can be as required, makes length and diameter and be 20～40 millimeters Miniature Sensor or make length and diameter is 5～10 millimeters a microsensor, to satisfy the requirements of different test occasions.
Claims (10)
1, a kind of optical-fibre gas chemical sensor, comprise sensor body (1), light transmitting fiber (2) and sensitive element (3), it is characterized in that in the sensor body (1) cylindrical cavity being arranged, wall one side has inlet channel (7), have a light transmitting fiber to insert mouthful (10) on the adjacent opposite side wall of inlet channel (7), light transmitting fiber inserts mouthful (10) and communicates with the interior cylindrical cavity of body; Insert the sensitive element (3) that the band light reflecting mirror is housed in mouthful (10) relative cavity at light transmitting fiber, this sensitive element (3) can produce changes in optical properties after reacting with tested aerochemistry; Light transmitting fiber (2) adopts the two branch of " y " type optical fiber, is contained in the insertion mouth (10) of sensor body.
2, optical-fibre gas chemical sensor according to claim 1, it is characterized in that sensor body (1) is made of body bottom (4) and body body (5), with being threaded, have a groove (6) on the round boss of body bottom (4) middle part between them; Inlet channel on the sensor wall (7) leaves in the cavity Lower Half, with the air inlet short tube (8) that is threaded, the port lid (9) of regulating the air inflow size is housed on the port of short tube (8) on it.
3, optical-fibre gas chemical sensor according to claim 1 and 2, it is characterized in that sensitive element (3) is made up of reagent ware (11) and the reagent that is contained in wherein, the outside surface metal-plated membrane of reagent ware (11), reagent is for producing the redox indicator of changes in optical properties, as lissamine green
, night orchid, phenanthroline dinuclear complex etc., wherein the dinuclear complex with phenanthroline is best.
4, optical-fibre gas chemical sensor according to claim 1 and 2, it is characterized in that more than inlet channel (7) highest level line, light transmitting fiber inserts in mouthful sensor cavities of (10) below and lays lens (12), and these lens (12) support fastening with screw thread hold-down ring (14).
5, optical-fibre gas chemical sensor according to claim 3, it is characterized in that more than inlet channel (7) the highest level line, light transmitting fiber inserts in mouthful sensor cavities of (10) below and lays lens (12), and these lens (12) are fastening with screw thread hold-down ring (14).
6, optical-fibre gas chemical sensor according to claim 1, it is characterized in that sensor body (1) is made of reactor body (15) and sensing body (16), reactor body (15) internal cavity lower wall is the inclined-plane, on the wall of bottom, inclined-plane a threaded hole (17) is arranged, top, inclined-plane wall has reagent inlet (18) and gas vent (19) successively side by side, inlet channel (7) is positioned on the wall by the adjacent opposite side of reagent inlet (18), with the air inlet short tube (8) that is threaded, the port lid (9) of regulating the air inflow size is housed on the port of short tube (8) on it; Sensing body (16) cavity lower wall is a hollow posts cock body (20), this plunger body (20) surfaces externally and internally all has screw thread, the endoporus of plunger body (20) is that light transmitting fiber inserts mouthful (10), threaded hole (17) diameter of a threaded hole (21) on bottom reactor body (15) internal cavity inclined-plane is identical near having on the wall of plunger body (20) opposite side, and on same horizontal line, reactor body (15) and sensing body (16) are by these two threaded holes (17,21), connect with a through hole attachment screw (22), the wall middle part that sensing body plunger body (20) is relative also has a waste liquid outlet (23).
7, optical-fibre gas chemical sensor according to claim 6, it is characterized in that sensitive element (3) is made up of detection cell and reagent, detection cell is a pipe that the bottom is porose, the outside surface metal-plated membrane, the mouth of pipe has a circumferential notch, and this breach is communicated with through hole in sensing body (16) the inner via hole attachment screw (22); Reagent is for producing the redox indicator of changes in optical properties, as lissamine green
, night orchid, phenanthroline complex compound etc., be best wherein with the phenanthroline dinuclear complex, it enters interfacial reactor (27) and gas reaction by the inlet of the reagent on the reactor body (15) (18).
8, optical-fibre gas chemical sensor according to claim 7, it is characterized in that detection cell can be made up of the catoptron (25) and a planar lens (26) of the hollow reflection tube (24) of both ends open, band concave spherical surface, catoptron (25) concave spherical surface has a through hole on the bottom, and the one side and the planar lens (26) of catoptron (25) band concave spherical surface are bonded in hollow reflection tube (24) two ends respectively.
9, according to claim 6 or 7 or 8 described optical-fibre gas chemical sensors, it is characterized in that being equipped with the propclip gripping member (28) of a band groove in the lower end of sensor body (1), reactor body (15) and sensing body (16) are fixed in the groove with lock-screw (29), propclip gripping member (28) bottom portion of groove has a through hole, and is corresponding with the light transmitting fiber insertion mouthful (10) on the sensing body (16).
10, optical-fibre gas chemical sensor according to claim 9 is characterized in that interfacial reactor (27) is closed circular pipe or the rectangular pipe of being made by poromerics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91214863 CN2099973U (en) | 1991-08-20 | 1991-08-20 | Optical fiber gas chemical sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91214863 CN2099973U (en) | 1991-08-20 | 1991-08-20 | Optical fiber gas chemical sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2099973U true CN2099973U (en) | 1992-03-25 |
Family
ID=4923015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91214863 Withdrawn CN2099973U (en) | 1991-08-20 | 1991-08-20 | Optical fiber gas chemical sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2099973U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721662A (en) * | 2011-07-19 | 2012-10-10 | 赵捷 | Mining infrared gas sensor with high efficiency of light sources |
-
1991
- 1991-08-20 CN CN 91214863 patent/CN2099973U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721662A (en) * | 2011-07-19 | 2012-10-10 | 赵捷 | Mining infrared gas sensor with high efficiency of light sources |
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| PB01 | Publication | ||
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |