CN104089933B - A kind of liquid physical and chemical parameter measurement mechanism based on fluorescence analysis - Google Patents
A kind of liquid physical and chemical parameter measurement mechanism based on fluorescence analysis Download PDFInfo
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- CN104089933B CN104089933B CN201410305204.6A CN201410305204A CN104089933B CN 104089933 B CN104089933 B CN 104089933B CN 201410305204 A CN201410305204 A CN 201410305204A CN 104089933 B CN104089933 B CN 104089933B
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Abstract
The invention discloses a kind of liquid physical and chemical parameter measurement mechanism based on fluorescence analysis, belong to field of measuring technique. Measurement mechanism of the present invention mainly comprises following improvement: one, by multiple to the sensitive fluorescent mass integration of different liquids physical and chemical parameter sensitivity on a sensitive fluorescent element, and utilize different light band pass filters to extract the fluorescence of the corresponding physical and chemical parameter information of reflection, then the fluorescence intensity extracting is analyzed, can be realized multiple physical and chemical parameter is carried out to Measurement accuracy; Two, increase the physical defoaming device based on capillary structure, and combined with existing chemical froth breaking means, can effectively eliminate the impact on certainty of measurement of bubble in testing liquid; Three, the light path of utilizing three ports light rings to carry out between fluorescence excitation light source, sensitive fluorescent element, fluorescence reception module connects, avoid the doping coupling between exciting light and fluorescence, and utilize optical fiber collimator to process exciting light and fluorescence, further improve certainty of measurement.
Description
Technical field
The present invention relates to a kind of liquid physical and chemical parameter measurement mechanism, relate in particular to a kind of liquid physics and chemistry based on fluorescence analysisParameter measuring apparatus, belongs to field of measuring technique.
Background technology
The object of analyzing in environment, monitor is the material of trace, ultramicron often, has and much also has timeliness and spaceProperty, therefore require more and more higher to measuring technique. Along with the development of optical pickocff, optical measuring method is in field of measuring techniqueBe subject to extensive use. The advantages such as XRF is highly sensitive with it, detectability is low, accuracy is good are obtaining rapidly in recent yearsDevelopment, as this method can be widely used in online water quality monitoring.
Dissolved oxygen, it is aquatic animals and plants existence necessary condition, to the detection of oxygen in water concentration in industry, medical science andThe aspects such as environmental area all have very important significance. In recent years, along with the development of optical pickocff, a kind of sudden based on fluorescenceThe optical measuring method of the principle of going out has substituted traditional iodimetric titration and oxygen electrode method gradually. The disclosed China of the people such as Xiong Yan, Guan YafengPatent (publication number: CN101713734A) has been described a kind of Fiber Optic Oxygen sensing of the real-time online based on Fluorescence Quenching PrincipleDevice, this sensor uses V-type optical fiber to carry out exciting light transmission and fluorescence reception, terminal connection carrier sheet glass and oxygen-sensitive fluorescentFilm, a Zhi Duanwei excitation fiber connects light source, and another end connects photodetector for receiving optical fiber. The shortcoming of this detecting strategyBe between input light and the fluorescence that excites generation, to occur sometimes that doping mixes, can not effectively separate, this will make to detectFluorescence inaccurate, thereby will higher requirement be proposed to process structure design. The disclosed patents of people such as first phoenix is red, Yang person of outstanding talent(publication number: CN101586990A) is based on Fluorescence Quenching Principle equally, uses U-shaped plastic optical fiber transmission exciting light and glimmeringLight, its shortcoming is that the coupling efficiency of exciting light, fluorescence and optical fiber is lower, thus the fluorescence letter that photodetector is receivedNumber seldom, be unfavorable for surveying. In addition, the structure of discrete detection, is easily subject to the impact of the factors such as environmental change.
Further, a lot of online water quality measurement systems, as dissolved oxygen sensing system, it has only considered single physics and chemistry ginsengNumber, as salinity in temperature, pH value, water etc., on the impact of measuring system, seldom realizes multi parameter simultaneous measuring, even if having fewPart measuring system realizes, and is also more to measure by be furnished with related sensor in measuring system, as TEMPDevice, salinity sensor, this will hinder the structural design of measuring system integral type widely, brings between different sensors mutualInterference problem, integrated level is lower.
In addition, underwater bubble is the influence factor that many dissolved oxygen sensing systems are not considered. When flowing liquid surfaceOccur that bubble will be adsorbed on the surface of fiber-optic sensor probe when bubble, known by the optical characteristics of bubble, bubble can make fromThe incident light that optical fibre transmission is come and the fluorescence generation scattering, the refraction that excite generation. Because fluorescence itself is just very faint, thereby willGreatly reduce the receiving efficiency of fluorescence. In addition, also comprise oxygen molecule in the main component of underwater bubble, water plant passes through lightCooperation, with producing oxygen, in the time that oxygen in water concentration is saturated, will form bubble by bubbing, and number of bubbles much willAffect the stability of dissolved oxygen sensing system, the dissolved oxygen concentration numerical value of measurement divides with regard to having comprised the oxygen of a part in bubbleThe concentration of son, causes measurement result inaccurate.
Summary of the invention
Technical problem to be solved by this invention is to overcome prior art deficiency, and a kind of liquid based on fluorescence analysis is providedBody physical and chemical parameter measurement mechanism can accurately be measured multiple physical and chemical parameters such as oxygen concentration, temperature, pH values simultaneously, and toolThere is higher level of integrated system, more compact structure.
The present invention solves the problems of the technologies described above by the following technical solutions:
A liquid physical and chemical parameter measurement mechanism based on fluorescence analysis, comprising: fluorescence excitation light source, sensitive fluorescent unitPart, fluorescence reception module, signal are processed and control module, sensitive fluorescent element respectively with fluorescence excitation light source, fluorescence reception mouldPiece light path connects; Zones of different on described sensitive fluorescent element is coated with glimmering to different liquid physical and chemical parameter sensitivities of N kindPhotaesthesia material, N is greater than 1 natural number, and exciting of all can sending at fluorescence excitation light source of this N kind sensitive fluorescent materialUnder irradiation, produce fluorescence; In light path between fluorescence excitation light source and sensitive fluorescent element, be provided with the first switching device, canSignal process and the control of control module under to make exciting light that fluorescence excitation light source sends only be radiated at described N kind fluorescence quickIn one in sense material; Described fluorescence reception module comprises second switch device, photodetector and N light belt pass filterSheet, wherein the passband centre wavelength of i light band pass filter equals peak value place in the fluorescence spectrum of i kind sensitive fluorescent materialWavelength,, second switch device can make sensitive fluorescent element institute under the control of signal processing and control moduleThe fluorescence producing only, by one in N light band pass filter, turns through photodetector by the fluorescence of light band pass filterAfter being changed to the signal of telecommunication, export signal processing and control module to; Signal process and control module for to the first switching device, theTwo switching devices are controlled, and draw the physical and chemical parameter of testing liquid according to received fluorescence intensity information.
In order effectively to eliminate the bubble in testing liquid, thus improving measurement accuracy, and the present invention further proposes following changingEnter technical scheme:
This measurement mechanism also comprises the defoaming device for eliminating testing liquid bubble, and described defoaming device comprises settingHollow structure in the fluid course of testing liquid, described hollow structure is along equal on two sides of fluid course directionBe provided with one group of tip-like structure, each tip-like inside configuration at least exists one to be communicated with outside inner empty with hollow structureThe capillary channel in chamber, testing liquid can only be by these capillary channels by described hollow structure.
Further, described defoaming device also comprises and is arranged in described fluid course and is positioned at described hollow structureThe container that is contained with chemical defoamer of front end, the chemical defoamer in this container can enter during by this container at testing liquidTesting liquid.
Preferably, described N kind to the sensitive fluorescent material of different liquid physical and chemical parameter sensitivities comprise to liquid oxygen concentration,The sensitive fluorescent material of fluid temperature, liquid pH value sensitivity. Preferably, described to liquid oxygen concentration, fluid temperature, liquid pH valueResponsive sensitive fluorescent material is followed successively by: ruthenium complex, rare earth luminescent material, shitosan fluorescent nano material.
For fear of the impact of doping coupling on certainty of measurement between exciting light and fluorescence, below the present invention further proposesImprove technical scheme: described sensitive fluorescent element by three port circulators respectively with fluorescence excitation light source, fluorescence reception moduleLight path connect, fluorescence excitation light source, sensitive fluorescent element, fluorescence reception module respectively with described three port circulators first,Second, third port connects.
Further, sensitive fluorescent element and three port circulators be connected light path in be also in series with a fiber optic collimatorDevice.
Compared to existing technology, technical scheme of the present invention and further improvement project thereof have following beneficial effect:
Sensitive fluorescent element of the present invention the is integrated multiple sensitive fluorescent material to different liquids physical and chemical parameter sensitivity, andUtilize different light band pass filters to extract the fluorescence of the corresponding physical and chemical parameter information of reflection, then utilize fluorescence analysis methodThe fluorescence intensity extracting is analyzed, thereby can realize, multiple physical and chemical parameter is carried out to Measurement accuracy, significantly improve simultaneouslyLevel of integrated system, and avoided the phase mutual interference between different sensors;
The present invention proposes a kind of physical defoaming device based on capillary structure, can effectively eliminate the bubble in testing liquidOn the impact of certainty of measurement; The present invention also can be combined above-mentioned physical defoaming device with existing chemical froth breaking means, thereby enters oneStep improves the effect that bubble is eliminated;
The present invention utilize three ports light rings carry out fluorescence excitation light source, sensitive fluorescent element, fluorescence reception module itBetween light path connect, avoided doping between exciting light and fluorescence coupling, and utilized optical fiber collimator to exciting light and fluorescenceProcess, further improved the certainty of measurement of fluorescence analysis method.
Brief description of the drawings
Fig. 1 is the structural profile schematic diagram of liquid physical and chemical parameter measurement mechanism of the present invention described in detailed description of the invention, itsIn each label implication as follows:
1, light source; 2, light source driving circuit plate; 3, fin; 4, modulation of source module; 5, signals collecting and control electricityRoad plate; 6, excitation fiber; 7, receive optical fiber; 8, optical filter; 9, condenser lens; 10, photodetector; 11, fiber annularDevice; 12, optical fiber collimator; 13, seal casinghousing; 14, optical branching device; 15, column structure; 16, photoswitch; 16 ', photoswitch;17, black light division board; 18, watertight sheet glass; 19, sensitive fluorescent membrane; 20, liquid communication pipe; 21, tip-like structure; 22, inHollow structure body; 23, rubber stopper; 24, defoaming device housing; 25, capillary channel; 26, small-sized vessel; 27, inlet valve; 28, sampleProduct pond; 29, exhaust tube; 30, cylinder steam vent; 31, aspiration pump; 32, vent cap; 33, measurement mechanism housing; 34, fixing spiral shellSilk; 35, suspension ring handle; 36, communication cable; 37, display screen; 38, communication interface; 39, PC.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated:
The present invention is directed to prior art deficiency, proposed a kind of liquid physical and chemical parameter measurement mechanism based on fluorescence analysis,Mainly comprise that following three aspects: improves: one, by multiple to the sensitive fluorescent mass integration of different liquids physical and chemical parameter sensitivity in oneOn individual sensitive fluorescent element, and utilize different light band pass filters to extract the fluorescence that reflects corresponding physical and chemical parameter information,Then utilize existing fluorescence analysis method to analyze the fluorescence intensity extracting, thereby can realize simultaneously to multiple physics and chemistryParameter is carried out Measurement accuracy; Two, increased the physical defoaming device based on capillary structure, and tied mutually with existing chemical froth breaking meansClose, can effectively eliminate the impact on certainty of measurement of bubble in testing liquid; Three, utilizing three ports light rings to carry out fluorescence swashsLight path between light emitting source, sensitive fluorescent element, fluorescence reception module connects, and has avoided the doping coupling between exciting light and fluorescenceClose, and utilize optical fiber collimator to process exciting light and fluorescence, further improved the certainty of measurement of fluorescence analysis method.
Fig. 1 has shown a preferred embodiment of liquid physical and chemical parameter measurement mechanism of the present invention. This measurement mechanism mainly wrapsDraw together following five parts: fluorescence excitation light source, sensitive fluorescent element, fluorescence reception module, signal processing and control module andDefoaming device.
As shown in Figure 1, fluorescence excitation light source part comprises light source 1, light source driving circuit plate 2, fin 3, modulation of sourceModule 4, excitation fiber 6, light source driving circuit plate 2 is luminous and export three port opticals to by excitation fiber 6 for driving light source 1The first port of fine circulator 11, modulation of source module 4 is for regulating the light emitted wavelength of light source 1. Light source 1 in this enforcementAdopt xenon source, spectral region is 250-1500nm, and power is 150W, and the light wavelength that excites of output is 455nm.
Sensitive fluorescent element of the present invention is the sensitive fluorescent membrane that is coated on watertight sheet glass 18 surfaces shown in Fig. 119, sensitive fluorescent membrane 19 comprises three kinds of different sensitive fluorescent materials to dissolved oxygen, temperature, pH value sensitivity respectively, can pass throughThe lower surface of watertight sheet glass is prepared and be coated on to sol-gel technique. As shown in the figure, watertight sheet glass 18 is divided into 3Region, each region surface applies a kind of sensitive fluorescent material, in order to prevent that exciting light from irradiating different sensitive fluorescent things simultaneouslyMatter, comes 3 region separation of watertight sheet glass 18 by vertical black light division board 17 is set. Three fiber port annularsIn light path between the second port and the sensitive fluorescent element of device 11, be disposed with optical fiber collimator 12, optical branching device 14, lightSwitch 16, from the exciting light of the second port output of three fiber port circulators 11 after optical fiber collimator collimation by optical branching device14 are divided into three tunnels, and Zhe San road light exports respectively 3 regions of watertight sheet glass 18, each road light correspondence one to via photoswitch 16Individual region; Photoswitch 16 any Yi Luhuoji road in can or closing Zhe San road light at gating under external control. As shown in the figure, forWaterproof, the optical fiber collimator 12 in the present embodiment, optical branching device 14, photoswitch 16, black light division board 17, watertight sheet glass 18Be packaged in seal casinghousing 13, sensitive fluorescent membrane 19 be positioned at seal casinghousing 13 bottom and can with external contact.
Described sensitive fluorescent material can be selected from the various sensitive fluorescent materials of existing discovery, in the present embodiment, to moltenSeparate the fluorescent material of oxygen sensitivity and select ruthenium complex, as three (4,7-biphenyl-1,10-phenanthroline) ruthenous chloride (Ru (dpp)3Cl2), thermally sensitive fluorescent material is selected rare earth luminescent material, as Y2O2S:Eu+Fe2O3, to the fluorescence of pH value sensitivityMatter selects shitosan fluorescent nano material as naphthalimide modification CMC CMCS3N. Above-mentioned sensitive fluorescent thingMatter is current material, about its detailed introduction can referring to document (Zhou Dongqiu, Xiao Shaorong, Xiao Lin. based on Fluorescence Quenching PrincipleFiber optic dissolved oxygen sensor [J]. optics and photoelectric technology, 2013,11(4): 64-66., Bai Haiying, Wang Jimin. based onThe fluorescence optical fiber temperature-sensing system [J] of novel rare-earth luminescent material. sensing technology journal, 2004, (4): 660-662., more thanIntelligent, Liang Shucai, Zhong Haidi, etc. the preparation of novel chitosan fluorescence nano grain and PH sensitive property research [J]. analytical chemistryResearch notes, 2011,39(3): 409-413.). For convenience of explanation, the present embodiment has only been enumerated dissolved oxygen, temperature, pH valueThe sensitive fluorescent material of these three kinds of liquid physical and chemical parameter sensitivities, in fact, can also continue increases other liquid physical and chemical parameterThe sensitive fluorescent material of responsive (for example salinity), thereby the measurement category of expansion measurement mechanism of the present invention.
Fluorescence reception module in the present embodiment, as shown in Figure 1, comprise receive optical fiber 7, photoswitch 16 ', three tablet filters8, three condenser lenses 9, three photodetectors 10, wherein three tablet filters 8 are light band pass filter, cardiac wave in its passbandThe wavelength at peak value place in the long fluorescence spectrum that equals respectively three kinds of sensitive fluorescent materials, in the present embodiment, be respectively 615nm,630nm, 534nm, correspond respectively to the extraction of the sensitive fluorescent fluorescence that material sends to dissolved oxygen, temperature, pH value sensitivity. ConnectReceive the fluorescence that receives from the 3rd port of three fiber port circulators 11 of optical fiber 7 first pass through photoswitch 16 ', photoswitch 16 'Three output ports be connected with three tablet filters 8 respectively, after every tablet filter 8, connect successively a slice condenser lens 9 and oneIndividual photodetector 10. Photoswitch 16 ' can be at any road optical filter 8 of gating under external control. Three fiber port circulators 11The fluorescence of the 3rd port output after the optical filter 8 of institute's gating filters again line focus lens 9 converge, finally by photodetector10 are converted to the signal of telecommunication exports signal processing and control module to. Photodetector 10 in the present embodiment is photomultiplier,Wavelength detection scope: 185nm-900nm, side window type.
Signal in the present embodiment is processed and control module is signals collecting and control circuit board 5, its respectively with photoswitch16, photoswitch 16 ', three photodetectors, 10 signals connect, can be respectively to photoswitch 16 and photoswitch 16 ' control, andThe voltage signal that received photodetector 10 is exported and default dissolved oxygen concentration, temperature, pH value and voltage signalBetween relation curve or function compare, draw dissolved oxygen concentration, temperature, the pH value information of testing liquid. The present embodimentIn, signals collecting and control circuit board 5 also can communicate by communication cable 36 and outside PC 39, and PC 39 comprises aobviousShow screen 37 and communication interface 38.
Defoaming device in the present embodiment comprises chemical froth breaking and physical defoaming two parts, and its structure as shown in Figure 1, comprisesDefoaming device housing 24. Defoaming device housing 24 upper end left and right sides are respectively provided with for fixing and the stainless steel column structure being connected15, for fixing air-vent in the lower end of measurement mechanism housing 33, simultaneously by defoaming device housing 24 upper ends and sealingHousing 13 interfixes. The bottom of defoaming device housing 24 is provided with inlet valve 27. Establish bottom in defoaming device housing 24Be equipped with two for holding the uncovered small-sized vessel 26 of chemical defoamer, can be by running through defoaming device housing 24 and measuring dressThe liquid communication pipe 20 of putting housing 33 by outside to the chemical defoamer of annotating in small-sized vessel 26. The middle part of defoaming device housing 24Be provided with a hollow structure 22, between its outer rim and defoaming device housing 24, realize sealing by rubber stopper 23, make liquidBody cannot pass through. As shown in the figure, the upper and lower surface of hollow structure 22 is respectively arranged with one group of tip-like structure 21, each needle pointThe inside of shape structure 21 is provided with the capillary channel 25 of the internal cavities of at least one connection outside and hollow structure 22, inConnection is realized by himself internal cavities and these capillary channels 25 in the both sides up and down of hollow structure body 22, due to hollow knotBetween the outer rim of structure body 22 and defoaming device housing 24, seal, therefore the liquid in defoaming device can only be via these capillarysPassage 25 passes through. The top of defoaming device housing 24 is provided with through measurement mechanism housing 33 and is communicated with outside cylinder steam vent30, the outer setting of cylinder steam vent 30 has the vent cap 32 that can open and close. Described chemical defoamer can adopt variousExisting defoamer, the preferred absolute ethyl alcohol of the present invention, absolute ethyl alcohol, as a kind of chemical defoamer, has good defoaming effect,Ethanol has volatility simultaneously, and it will, along with the continuation of air-flow is risen and volatilizees, so just can avoid oxygen molecule to be also dissolved inIn ethanol and cause measure error. Described hollow structure 22 and small-sized vessel 26 preferably adopt the corrosion-resistant materials such as pottery, glassMaterial is made.
Above-mentioned defoaming device in use, is put into sample cell 28 by defoaming device, first by liquid communication pipe 20 to littleThe chemical defoamer of annotating in type vessel 26, then opens vent cap 32, and by exhaust tube 29 by cylinder steam vent 30 with take outAir pump 31 connects, and aspiration pump 31 is outwards bled, and the testing liquid in sample cell 28 enters defoaming device also by inlet valve 27Rise gradually, in the time that liquid level exceedes the upper limb of small-sized vessel 26, chemical defoamer enters testing liquid, realizes chemical froth breaking. WithLiquid level and continue rise and pass through hollow structure 22, bubble remaining in liquid is at tip-like structure 21 and capillary channel 25Effect under gradually refinement and disappear. This defoaming device has proposed a kind of physical defoaming structure based on capillary structure, and with existingThere are chemical froth breaking means to combine, can effectively eliminate the bubble in liquid.
For the ease of using, be also fixed with suspension ring handle 35 in the upper end of measurement mechanism housing 33 by fixed screw 34.
Further understand technical solution of the present invention for the ease of the public, below the using method to above-mentioned measurement mechanism and workBriefly explain as process.
Measurement mechanism is placed in sample cell 28 by step 1, utilization hanging handle 35, opens liquid communication pipe 20, opens postBody vent cap 32, injects a small amount of absolute ethyl alcohol to small-sized vessel 26 by liquid communication pipe 20, then opens water intaking valveDoor 27, utilizes aspiration pump 31 slowly to extract the gas in defoaming device, and to extraneous exhaust, testing liquid will be by inlet valve 27Slowly enter into defoaming device, first flowing liquid contacts the absolute ethyl alcohol in small-sized vessel 26, under its effect, and bubbleCan eliminate gradually. Ethanol has volatility simultaneously, and it will, along with the continuation of air-flow is risen and volatilizees, so just can avoid oxygenMolecule is also dissolved in ethanol and causes measure error. Along with liquid continues to flow, when by hollow structure 22, in tip-likeUnder the effect of structure 21 and capillary channel 25, bubble can be by refinement gradually until eliminate. Flowing liquid is in two cover froth breaking worksUnder the effect of order, will reach the best effects that reduces the bubble in liquid.
Step 2, utilizes signals collecting and control circuit board 5 to send pulse command driving light source modulation module 4 and light source drivesMoving circuit 2, modulates light source 1, and light source driving circuit provides stably power stage for it. Exciting light after modulation is through swashingLuminous fine 6 are transferred to the first port of three fiber port circulators 11, then from the second port of three fiber port circulators 11Output to optical fiber collimator 12, the light from the collimation of optical fiber collimator 12 outgoing is divided into three beams under the effect of optical branching device 14Light, first controls photoswitch 16, makes wherein that a road photoconduction is logical (supposes that it is corresponding to the sensitive fluorescent thing to dissolved oxygen sensitivityMatter), two-way closure in addition, exciting light will incide through watertight sheet glass 18 on the sensitive fluorescent material of dissolved oxygen sensitivity, producesThird contact of a total solar or lunar eclipse spectral limit is about the fluorescence of 585-630nm, feeds back to optical fiber collimator 12, and optical fiber collimator is simultaneously as exciting lightInput and fluorescence reception device, can make fluorescence be coupled in maximum efficiency photodetector, also avoided well discrete spyGeodesic structure is subject to the impact of environmental change.
Step 3, fluorescence is the 3rd port output from three fiber port circulators 11 through optical fiber collimator 12, from three port opticalsThe fluorescence of the 3rd port output of fine circulator is coupled to and receives optical fiber 7, then by control photoswitch 16 ', make fluorescence through logicalThe light band pass filter 8 that is 615nm with centre wavelength, from selecting the wavelength that fluorescence is the strongest, focuses on through corresponding condenser lens 9After, then received by photodetector 10, fluorescence signal is converted into the signal of telecommunication.
Step 4, the signal of telecommunication that photodetector 10 receives is processed through signals collecting and control circuit board 5, and voltage is believedNumber and default dissolved oxygen concentration and voltage between corresponding relation compare, draw dissolved oxygen concentration information, and will processAfter information deliver to PC, show or continue by PC and transmit to far-end.
Step 5, adopts above-mentioned identical method to measure temperature, pH value, and hockets and repeatedly measure to improveAccuracy of measurement.
Step 6, does corresponding compensation by the temperature measuring, pH value data by algorithm for design, reduces dissolved oxygen concentrationMeasure error, improves certainty of measurement.
Relation between above-mentioned dissolved oxygen concentration/temperature/pH value and voltage can be demarcated in advance by experiment, below only withThe example that is demarcated as of the relation between dissolved oxygen concentration and voltage briefly explains:
Step 1, in sample pool, inject the water of certain volume, detect initial dissolution oxygen concentration value with standard dissolved oxygen instrument;
Step 2, use measurement mechanism of the present invention are measured the corresponding magnitude of voltage of initial dissolution oxygen concentration;
Step 3, in water, slowly pass into oxygen, improve the concentration of oxygen in water, use standard dissolved oxygen detector to detectDissolved oxygen concentration value under one group of variable concentrations condition detects under variable concentrations condition corresponding with measurement mechanism of the present invention simultaneouslyMagnitude of voltage;
Step 4, one group of obtained dissolved oxygen concentration value-voltage value data is carried out to matching, can obtain the present invention and surveyRelation between magnitude of voltage and the dissolved oxygen concentration value of amount measurement device.
The demarcation of the relation between other physical and chemical parameter value and measuring voltage value similarly, repeats no more herein.
Claims (8)
1. the liquid physical and chemical parameter measurement mechanism based on fluorescence analysis, comprising: fluorescence excitation light source, sensitive fluorescent element,Fluorescence reception module, signal are processed and control module, sensitive fluorescent element respectively with fluorescence excitation light source, fluorescence reception module lightRoad connects; It is characterized in that, it is quick to different liquid physical and chemical parameters that the zones of different on described sensitive fluorescent element is coated with N kindThe sensitive fluorescent material of sense, N is greater than 1 natural number, and this N kind sensitive fluorescent material all can send at fluorescence excitation light sourceExciting light irradiate the lower fluorescence that produces; In light path between fluorescence excitation light source and sensitive fluorescent element, be provided with the first switch dressPut, can under the control of signal processing and control module, make the exciting light that fluorescence excitation light source sends only be radiated at described N kindIn one in sensitive fluorescent material; Described fluorescence reception module comprises second switch device, a photodetector and N light beltPass filter sheet, wherein the passband centre wavelength of i light band pass filter equals in the fluorescence spectrum of i kind sensitive fluorescent materialThe wavelength at peak value place,, second switch device can make sensitive fluorescent under the control of signal processing and control moduleThe fluorescence that element produces only, by one in N light band pass filter, is visited through photoelectricity by the fluorescence of light band pass filterSurvey after device is converted to the signal of telecommunication and export signal processing and control module to; Signal is processed and control module is used for the first switch dressPut, second switch device controls, and draws the physical and chemical parameter of testing liquid according to received fluorescence intensity information.
2. liquid physical and chemical parameter measurement mechanism as claimed in claim 1, is characterized in that, this measurement mechanism also comprises for eliminatingThe defoaming device of bubble in testing liquid, described defoaming device comprises the hollow structure in the fluid course that is arranged at testing liquidBody, described hollow structure is along being provided with one group of tip-like structure, each tip-like on two sides of fluid course directionInside configuration at least exists one to be communicated with capillary channel outside and hollow structure internal cavities, and testing liquid can only pass through thisA little capillary channels are by described hollow structure.
3. liquid physical and chemical parameter measurement mechanism as claimed in claim 2, is characterized in that, described defoaming device also comprises and being arranged atIn described fluid course and be positioned at the container that is contained with chemical defoamer of described hollow structure front end, the chemistry in this containerDefoamer can enter at testing liquid testing liquid during by this container.
4. liquid physical and chemical parameter measurement mechanism as claimed in claim 3, is characterized in that, described chemical defoamer is anhydrous secondAlcohol.
5. liquid physical and chemical parameter measurement mechanism as described in claim 1～4 any one, is characterized in that, described N kind is to differentThe sensitive fluorescent material of liquid physical and chemical parameter sensitivity comprises the fluorescence of liquid oxygen concentration, fluid temperature, liquid pH value sensitivity quickSense material.
6. liquid physical and chemical parameter measurement mechanism as claimed in claim 5, is characterized in that, described to liquid oxygen concentration, liquid temperatureThe sensitive fluorescent material of degree, liquid pH value sensitivity is followed successively by: ruthenium complex, rare earth luminescent material, shitosan fluorescent nano material.
7. liquid physical and chemical parameter measurement mechanism as described in claim 1～4 any one, is characterized in that, sensitive fluorescent element is logicalCross three port circulators and be connected with fluorescence excitation light source, fluorescence reception module light path respectively, fluorescence excitation light source, sensitive fluorescent unitPart, fluorescence reception module are connected with first, second, third port of described three port circulators respectively.
8. liquid physical and chemical parameter measurement mechanism as claimed in claim 7, is characterized in that, at sensitive fluorescent element and three port ringsIn the connection light path of shape device, be also in series with an optical fiber collimator.
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| CN108956465B (en) * | 2018-07-27 | 2024-07-12 | 天津大学 | Plug-in structure for on-line monitoring of oilfield reinjection water |
| CN108827927A (en) * | 2018-08-03 | 2018-11-16 | 江苏中农物联网科技有限公司 | A kind of optical dissolved oxygen sensor test device |
| CN112986333A (en) * | 2021-02-07 | 2021-06-18 | 浙江工业大学 | Device for measuring dissolved oxygen and improving measurement stability in variable distance mode |
| CN115684115A (en) * | 2022-11-02 | 2023-02-03 | 天津大学 | Optical fiber chemical sensing system and method with double parameters of dissolved oxygen and temperature in water |
| CN115575340B (en) * | 2022-11-08 | 2023-03-10 | 杭州谱育科技发展有限公司 | Absorbance detection device and method |
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