CN111239063A - Optical fiber water quality monitoring probe structure based on capillary tube - Google Patents
Optical fiber water quality monitoring probe structure based on capillary tube Download PDFInfo
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- CN111239063A CN111239063A CN202010114492.2A CN202010114492A CN111239063A CN 111239063 A CN111239063 A CN 111239063A CN 202010114492 A CN202010114492 A CN 202010114492A CN 111239063 A CN111239063 A CN 111239063A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention provides an optical fiber water quality monitoring probe structure based on a capillary tube, which is characterized in that: the probe structure is formed by embedding a light emergent end I of an incident optical fiber and a light incident end II of an emergent optical fiber at two ends of a capillary tube with a slotted structure together, and is placed in an environment to be detected, wherein the light incident end I of the incident optical fiber is connected with a light source, and the light emergent end II of the emergent optical fiber is connected with a spectrometer; the light emergent end I of the incident optical fiber is provided with a hemispherical optical fiber micro lens; the lengths of the light emergent end I of the incident optical fiber and the light incident end II of the emergent optical fiber in the capillary are both smaller than the length of the part, which is not grooved, of the two ends of the grooved structure of the capillary. The invention can utilize the transmission spectrum method to monitor the change of water quality on line in real time, and solves the problems that the traditional water quality sensor has large volume and is not easy to monitor on line.
Description
Technical Field
The invention relates to the technical field of optical water quality detection, in particular to an optical fiber water quality monitoring probe structure based on a capillary tube.
Background
Ocean water quality environmental monitoring is a life line affecting the development of ocean agriculture, but with the development of socioeconomic and the increasing population, a large amount of pollutants are discharged to the ocean. The marine pollutants have the characteristics of diversity (multiple physical and chemical quantity types) and interference complexity (multi-factor coupling), the marine water quality monitoring needs to be carried out for a long time in a large range in real-time on-line monitoring, certain requirements are required on the price, the volume and the power consumption of a detection system, the marine environment monitoring is particularly difficult, and the marine ecological environment and the economic synergistic development are directly influenced.
The ocean water quality sensor is a key core device for realizing ocean monitoring, the existing ocean water quality sensing system is limited in detection parameters, mainly comprises various different sensor units which are assembled, has the defects of low integration level, large volume, high power consumption, inaccurate measurement, large error and high possibility of interference, and is difficult to be used in a real-time online ocean abnormity monitoring system.
In the prior art, a plurality of optical fiber detection devices for water quality have defects in the aspects of structure, service life, process conditions and the like, such as:
application publication No. CN104568946A discloses a fiber sensor for measuring pH of water quality, and a probe of the fiber sensor mainly comprises a fiber probe, a coupler, a sensitive film, a reflector, a metal shell and the like. The double-optical-path detection is adopted, light transmitted by the transmitting optical fiber beam is reflected by the reflector and then received by the receiving optical fiber beam, and the detection purpose is achieved by comparing signal light changes. However, the structure is complicated due to the installation of the reflecting mirror, and the service life of the sensor is influenced by the service life of the film when the sensitive film is prepared.
The publication No. CN105352554B discloses a fiber grating pH/temperature sensor, which includes a section of optical fiber, and a long-period fiber grating with two ends is disposed on the fiber core of the optical fiber at intervals. Intelligent hydrogel (pH value and temperature sensitive type) is coated on the long-period fiber grating to realize the pH value and temperature sensing of the fiber grating. However, the hydrogel generally has the defects of low strength, poor toughness and the like, needs to be replaced periodically, and is difficult to realize long-term online monitoring.
The grant publication No. CN204988999U proposes a broad-spectrum optical fiber water quality detector, which uses an optical lens to convert an optical fiber outgoing beam into parallel light to pass through the liquid to be detected, and realizes water quality monitoring through light intensity change. However, the sensor has many components including a water pump and an optical collimator, which results in a complex structure and a large volume.
The No. CN203870017U discloses a water quality detection device with optical fiber sensing, which is characterized in that part of a coating layer of an optical fiber is stripped and wound on a bracket to be tightened and straightened, a coating layer removing section is contacted with a water environment, and evanescent waves generated by the sensing optical fiber are adopted for water quality monitoring. The fiber core of the sensor is in large-area contact with a water environment, and the service life of the sensor is influenced. The optical fiber is fragile and easy to break, and the optical fiber needs to be tensioned and straightened in the preparation process, so that the process requirement is high.
In summary, it is necessary to provide a water quality monitoring device with strong practicability, simple structure and miniaturized volume to solve the disadvantages in the prior art.
Disclosure of Invention
According to the technical problems that the existing water quality sensor is large in size, low in integration level and not easy to monitor on line, the optical fiber water quality monitoring probe structure is low in power consumption, low in cost and small in size. The invention mainly adopts the connection of the capillary tube and the optical fiber, and realizes the miniaturization of the water quality multi-parameter monitoring probe by changing the structure of the capillary tube and communicating the external environment with the environment in the tube by means of slotting.
The technical means adopted by the invention are as follows:
the utility model provides an optic fibre water quality monitoring probe structure based on capillary which characterized in that:
the probe structure is formed by embedding a light emergent end I of an incident optical fiber and a light incident end II of an emergent optical fiber at two ends of a capillary tube with a slotted structure together, and is placed in an environment to be detected, wherein the light incident end I of the incident optical fiber is connected with a light source, and the light emergent end II of the emergent optical fiber is connected with a spectrometer;
the light emergent end I of the incident optical fiber is provided with a hemispherical optical fiber micro lens; the lengths of the light emergent end I of the incident optical fiber and the light incident end II of the emergent optical fiber in the capillary are both smaller than the length of the part, which is not grooved, of the two ends of the grooved structure of the capillary.
Furthermore, the slotted structure is that two notches for liquid circulation are formed in the tube wall of the capillary tube.
Furthermore, the two notches are vertically symmetrical and transparent, so that the material exchange with the external environment is facilitated.
Furthermore, the notch is a rectangular groove, the width of the rectangular groove is 300-500 μm, and the length of the rectangular groove is 1000-5000 μm.
Furthermore, the inner diameter of the capillary is equal to or slightly smaller than the outer diameters of the incident optical fiber and the emergent optical fiber, so that the part of the optical fiber entering the capillary is tightly attached to the inner wall of the capillary.
Further, the light source is an ultraviolet-visible light broadband light source.
Furthermore, both ends of the capillary tube are also provided with sealing glue for packaging.
Compared with the prior art, the invention has the following advantages:
1. the water quality monitoring probe structure designed by the invention is prepared by utilizing the advantage of small capillary tube volume, the traditional water quality sensor detection pool is replaced by a mode of slotting on the wall of the capillary tube, and the slotting opening is used for circulating the water environment to be detected, so that the volume of the sensing probe can be greatly reduced, the water quality monitoring probe structure is used in a narrow environment which is not easy to measure, and the volume of the sensing probe is greatly reduced;
2. the invention utilizes the optical fiber micro lens arranged on the light emergent end surface of the incident optical fiber to replace the use of a complex optical device in the traditional water quality sensor, simplifies the structure of the sensor, greatly reduces the volume of the water quality monitoring probe and greatly reduces the cost;
3. the sensor of the invention utilizes the light transmission performance of the optical fiber, does not need the processes of stripping a cladding, drawing and the like, is easy to prepare, and the service life of the sensor is also ensured.
The invention can utilize the transmission spectrum method to monitor the change of water quality on line in real time, generate different absorption spectra for different components of substances to be detected, can efficiently and accurately identify and analyze the substances to be detected, and solves the problems that the traditional water quality sensor has high cost, low integration level, main part of simple assembly, large volume and difficult on-line monitoring.
For the reasons, the invention has wide application prospect and value in the fields of liquid detection such as water quality monitoring, oil quality detection and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the application of the capillary-based optical fiber water quality monitoring probe structure provided by the invention.
FIG. 2 is a schematic structural diagram of a capillary probe part in the capillary-based optical fiber water quality monitoring probe structure provided by the invention.
FIG. 3 is a schematic diagram of the capillary-based optical fiber water quality monitoring probe structure provided by the invention in the monitoring of a sensing device.
In the figure: 1. a light source; 2. an incident optical fiber; 3. a capillary tube; 3-1, a slotted structure; 4. an outgoing optical fiber; 5. a spectrometer.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in figure 1, the invention provides an optical fiber water quality monitoring probe structure based on a capillary tube, which can utilize a transmission spectrum method to monitor the change of water quality on line in real time and solve the problems that the traditional water quality sensor is large in size and not easy to monitor on line. Specifically, the probe structure is formed by embedding a light emergent end I of an incident optical fiber 2 and a light incident end II of an emergent optical fiber 4 at two ends of a capillary 3 with a slotted structure 3-1 together, namely, the incident optical fiber 2 and the emergent optical fiber 4 are connected and fixed through the capillary 3 and are placed in an environment to be tested, the light incident end I of the incident optical fiber 2 is connected with a light source 1, and the light emergent end II of the emergent optical fiber 4 is connected with a spectrometer 5.
The light source 1 is an ultraviolet-visible light broadband light source, the broadband light comprises light with a wavelength sensitive to a substance to be detected, and the light source can detect various substances in an environment to be detected by using absorption spectra of light with different wavelengths.
As shown in fig. 2, the light emitting end i of the incident optical fiber 2 is provided with a hemispherical optical fiber microlens, the radius of which is the same as the core radius of the incident optical fiber 2, for converging the light emitted from the incident optical fiber 2, converting the light into fine parallel light and emitting the light to the detected substance region, and then the detected light is received by the receiving optical fiber through the detected region.
The lengths of the emergent end I of the incident optical fiber 2 and the incident end II of the emergent optical fiber 4 in the capillary 3 are smaller than the lengths of the parts, which are not grooved, of the two ends of the grooved structure 3-1 of the capillary 3, so that the length of the detection cell is ensured to be as long as possible, the optical fiber cannot be directly exposed in an environment to be detected, and the two ends of the capillary 3 are provided with sealing glue for packaging the sensing probe. (Note that the glue solution is not shown in the figure)
The slotted structure 3-1 is characterized in that two notches for liquid circulation are formed in the tube wall of the capillary tube 3, and the two notches are vertically symmetrical and transparent, so that the material exchange with the external environment is facilitated.
The notch is a rectangular groove, the width of the rectangular groove is 300-500 mu m, and the length of the rectangular groove is 1000-5000 mu m.
The inner diameter of the capillary 3 is equal to or slightly smaller than the outer diameters of the incident optical fiber 2 and the emergent optical fiber 4, so that the part of the optical fiber entering the capillary 3 is tightly attached to the inner wall of the capillary 3.
When the probe works in a sensor device, a light source 1 generates signal light, the signal light is transmitted into a capillary 3 through an incident optical fiber 2, the light converged by an optical fiber micro lens is received by a light receiving end of an emergent optical fiber 4 after passing through a detection cell formed by a capillary slotted structure 3-1 and the external environment and then transmitted to a spectrometer 5, the spectrometer 5 finishes photoelectric conversion and demodulation of the detected light, and the change of the front and back intensity of the light passing through a substance to be detected is obtained, so that the component and the concentration of the substance to be detected are deduced.
The detection principle is shown in fig. 3, the incident light passes through the substance to be detected, the substance to be detected can absorb the light with specific wavelength, and the emergent light intensity is changed, so that the type and the concentration of the substance to be detected can be quantitatively analyzed by detecting the light intensity attenuation intensity.
Detection Lambert-beer law principle formula of the device:
Iout＝Iinexp(-αcL)
wherein:
Ioutis the received light intensity of the exiting optical fiber;
Iinthe intensity of emergent light incident on the optical fiber;
α is the molar absorption coefficient, which is related to the nature of the absorbing species and the wavelength λ of the incident light;
c is the concentration of the light absorbing substance, and the unit is mol/L;
l is the thickness of the absorbing layer in cm.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides an optic fibre water quality monitoring probe structure based on capillary which characterized in that:
the probe structure is formed by embedding a light emergent end I of an incident optical fiber (2) and a light incident end II of an emergent optical fiber (4) at two ends of a capillary tube (3) with a slotted structure (3-1) together, and is placed in an environment to be detected, wherein the light incident end I of the incident optical fiber (2) is connected with a light source (1), and the light emergent end II of the emergent optical fiber (4) is connected with a spectrometer (5);
the light emergent end I of the incident optical fiber (2) is provided with a hemispherical optical fiber micro lens; the lengths of the light emergent end I of the incident optical fiber (2) and the light incident end II of the emergent optical fiber (4) in the capillary tube (3) are both smaller than the length of the non-grooved part at the two ends of the grooved structure (3-1) of the capillary tube (3).
2. The capillary-based optical fiber water quality monitoring probe structure according to claim 1, wherein the slotted structure (3-1) is that two notches for liquid circulation are arranged on the wall of the capillary (3).
3. The capillary-based optical fiber water quality monitoring probe structure according to claim 2, wherein two of the notches are vertically symmetrical through.
4. The capillary-based optical fiber water quality monitoring probe structure according to claim 2 or 3, wherein the notch is a rectangular groove with a width of 300-500 μm and a length of 1000-5000 μm.
5. The capillary-based optical fiber water quality monitoring probe structure according to claim 1, wherein the inner diameter of the capillary (3) is equal to or slightly smaller than the outer diameters of the incident optical fiber (2) and the emergent optical fiber (4), so that the part of the optical fiber entering the capillary (3) is tightly attached to the inner wall of the capillary (3).
6. The capillary-based optical fiber water quality monitoring probe structure according to claim 1, wherein the light source (1) is an ultraviolet-visible broadband light source.
7. The capillary-based optical fiber water quality monitoring probe structure according to claim 1 or 5, wherein both ends of the capillary (3) are further provided with sealing glue for encapsulation.
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| CN202010114492.2A CN111239063A (en) | 2020-02-21 | 2020-02-21 | Optical fiber water quality monitoring probe structure based on capillary tube |
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| CN202010114492.2A CN111239063A (en) | 2020-02-21 | 2020-02-21 | Optical fiber water quality monitoring probe structure based on capillary tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118603890A (en) * | 2024-08-08 | 2024-09-06 | 上海电气数智生态科技有限公司 | Optical fiber water supply network water quality monitoring equipment and monitoring system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008116313A (en) * | 2006-11-02 | 2008-05-22 | Seikoh Giken Co Ltd | Device for measuring minute quantity liquid |
| JP3176582U (en) * | 2012-03-19 | 2012-06-28 | 株式会社島津製作所 | Light guide cell |
| CN203595666U (en) * | 2013-12-17 | 2014-05-14 | 山东微感光电子有限公司 | Capillary tube optical fiber reference air chamber |
| CN106645029A (en) * | 2016-12-07 | 2017-05-10 | 大连理工大学 | Weld type open-cavity optical fiber EFPI (extrinsic Farby-Perot interferometric) refractive index sensor |
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2020
- 2020-02-21 CN CN202010114492.2A patent/CN111239063A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008116313A (en) * | 2006-11-02 | 2008-05-22 | Seikoh Giken Co Ltd | Device for measuring minute quantity liquid |
| JP3176582U (en) * | 2012-03-19 | 2012-06-28 | 株式会社島津製作所 | Light guide cell |
| CN203595666U (en) * | 2013-12-17 | 2014-05-14 | 山东微感光电子有限公司 | Capillary tube optical fiber reference air chamber |
| CN106645029A (en) * | 2016-12-07 | 2017-05-10 | 大连理工大学 | Weld type open-cavity optical fiber EFPI (extrinsic Farby-Perot interferometric) refractive index sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118603890A (en) * | 2024-08-08 | 2024-09-06 | 上海电气数智生态科技有限公司 | Optical fiber water supply network water quality monitoring equipment and monitoring system |
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Application publication date: 20200605 |